Merge pull request #574 from mapbox/layer-description

Add the option to specify layer file, name, and description as JSON

CHANGELOG.md

@@ -1,3 +1,12 @@
+## 1.29.0
+
+* Add the option to specify layer file, name, and description as JSON
+* Add the option to specify the description for attributes in the
+  tileset metadata
+* In CSV input, a trailing comma now counts as a trailing empty field
+* In tippecanoe-json-tool, an empty CSV field is now an empty string,
+  not null (for consistency with tile-join)
+
 ## 1.28.1
 
 * Explicitly check for infinite and not-a-number input coordinates

Makefile

@@ -82,7 +82,7 @@ indent:
 TESTS = $(wildcard tests/*/out/*.json)
 SPACE = $(NULL) $(NULL)
 
-test: tippecanoe tippecanoe-decode $(addsuffix .check,$(TESTS)) raw-tiles-test parallel-test pbf-test join-test enumerate-test decode-test join-filter-test unit json-tool-test allow-existing-test csv-test
+test: tippecanoe tippecanoe-decode $(addsuffix .check,$(TESTS)) raw-tiles-test parallel-test pbf-test join-test enumerate-test decode-test join-filter-test unit json-tool-test allow-existing-test csv-test layer-json-test
 	./unit
 
 suffixes = json json.gz
@@ -169,7 +169,7 @@ enumerate-test:
 	rm tests/ne_110m_admin_0_countries/out/enum.mbtiles tests/ne_110m_admin_0_countries/out/enum.check
 
 join-test: tile-join
-	./tippecanoe -f -z12 -o tests/join-population/tabblock_06001420.mbtiles tests/join-population/tabblock_06001420.json
+	./tippecanoe -f -z12 -o tests/join-population/tabblock_06001420.mbtiles -YALAND10:'Land area' -L'{"file": "tests/join-population/tabblock_06001420.json", "description": "population"}'
 	./tippecanoe -f -Z5 -z10 -o tests/join-population/macarthur.mbtiles -l macarthur tests/join-population/macarthur.json
 	./tile-join -f -Z6 -z9 -o tests/join-population/macarthur-6-9.mbtiles tests/join-population/macarthur.mbtiles
 	./tippecanoe-decode tests/join-population/macarthur-6-9.mbtiles > tests/join-population/macarthur-6-9.mbtiles.json.check
@@ -199,7 +199,7 @@ join-test: tile-join
 	cmp tests/join-population/no-macarthur.mbtiles.json.check tests/join-population/no-macarthur.mbtiles.json	
 	./tile-join --no-tile-compression -f -e tests/join-population/raw-merged-folder tests/join-population/tabblock_06001420.mbtiles tests/join-population/macarthur.mbtiles tests/join-population/macarthur2.mbtiles
 	diff -x '*.DS_Store' -rq tests/join-population/raw-merged-folder tests/join-population/raw-merged-folder-compare
-	./tippecanoe -z12 -f -e tests/join-population/tabblock_06001420-folder tests/join-population/tabblock_06001420.json
+	./tippecanoe -z12 -f -e tests/join-population/tabblock_06001420-folder -YALAND10:'Land area' -L'{"file": "tests/join-population/tabblock_06001420.json", "description": "population"}'
 	./tippecanoe -Z5 -z10 -f -e tests/join-population/macarthur-folder -l macarthur tests/join-population/macarthur.json
 	./tippecanoe -d10 -D10 -Z9 -z11 -f -e tests/join-population/macarthur2-folder -l macarthur tests/join-population/macarthur2.json
 	./tile-join -f -o tests/join-population/merged-folder.mbtiles tests/join-population/tabblock_06001420-folder tests/join-population/macarthur-folder tests/join-population/macarthur2-folder
@@ -277,6 +277,12 @@ csv-test:
 	cmp tests/csv/out.mbtiles.json.check tests/csv/out.mbtiles.json
 	rm -f tests/csv/out.mbtiles.json.check tests/csv/out.mbtiles
 
+layer-json-test:
+	./tippecanoe -z0 -r1 -yNAME -f -o tests/layer-json/out.mbtiles -L'{"file":"tests/ne_110m_populated_places/in.json", "description":"World cities", "layer":"places"}'
+	./tippecanoe-decode tests/layer-json/out.mbtiles > tests/layer-json/out.mbtiles.json.check
+	cmp tests/layer-json/out.mbtiles.json.check tests/layer-json/out.mbtiles.json
+	rm -f tests/layer-json/out.mbtiles.json.check tests/layer-json/out.mbtiles
+
 # Use this target to regenerate the standards that the tests are compared against
 # after making a change that legitimately changes their output
 

README.md

@@ -148,6 +148,11 @@ If your input is formatted as newline-delimited GeoJSON, use `-P` to make input
  * `-l` _name_ or `--layer=`_name_: Use the specified layer name instead of deriving a name from the input filename or output tileset. If there are multiple input files
    specified, the files are all merged into the single named layer, even if they try to specify individual names with `-L`.
  * `-L` _name_`:`_file.json_ or `--named-layer=`_name_`:`_file.json_: Specify layer names for individual files. If your shell supports it, you can use a subshell redirect like `-L` _name_`:<(cat dir/*.json)` to specify a layer name for the output of streamed input.
+ * `-L{`_layer-json_`}` or `--named-layer={`_layer-json_`}`: Specify an input file and layer options by a JSON object. The JSON object must contain a `"file"` key to specify the filename to read from. It may also contain a `"layer"` field to specify the name of the layer, and/or a `"description"` field to specify the layer's description in the tileset metadata. Example:
+
+```
+tippecanoe -z5 -o world.mbtiles -L'{"file":"ne_10m_admin_0_countries.json", "layer":"countries", "description":"Natural Earth countries"}'
+```
 
 CSV input files currently support only Point geometries, from columns named `latitude`, `longitude`, `lat`, `lon`, `long`, `lng`, `x`, or `y`.
 
@@ -204,6 +209,7 @@ resolution is obtained than by using a smaller _maxzoom_ or _detail_.
    If the type is `bool`, then original attributes of `0` (or, if numeric, `0.0`, etc.), `false`, `null`, or the empty string become `false`, and otherwise become `true`.
    If the type is `float` or `int` and the original attribute was non-numeric, it becomes `0`.
    If the type is `int` and the original attribute was floating-point, it is rounded to the nearest integer.
+ * `-Y`_attribute_`:`_description_ or `--attribute-description=`_attribute_`:`_description_: Set the `description` for the specified attribute in the tileset metadata to _description_ instead of the usual `String`, `Number`, or `Boolean`.
  * `-E`_attribute_`:`_operation_ or `--accumulate-attribute=`_attribute_`:`_operation_: Preserve the named _attribute_ from features
    that are dropped, coalesced-as-needed, or clustered. The _operation_ may be
    `sum`, `product`, `mean`, `max`, `min`, `concat`, or `comma`

csv.cpp

@@ -27,6 +27,11 @@ std::vector<std::string> csv_split(const char *s) {
 			while (*s && isspace(*s)) {
 				s++;
 			}
+
+			if (*s == '\0' || *s == '\r' || *s == '\n') {
+				ret.push_back(std::string(""));
+				break;
+			}
 		}
 	}
 

jsontool.cpp

@@ -318,7 +318,9 @@ void join_csv(json_object *j) {
 				} else if (is_number(v)) {
 					attr_type = JSON_NUMBER;
 				}
+			}
 
+			{
 				// This knows more about the structure of JSON objects than it ought to
 
 				json_object *ko = (json_object *) malloc(sizeof(json_object));

main.cpp

@@ -83,6 +83,7 @@ int additional[256];
 struct source {
 	std::string layer = "";
 	std::string file = "";
+	std::string description = "";
 };
 
 size_t CPUS;
@@ -1133,7 +1134,7 @@ void choose_first_zoom(long long *file_bbox, std::vector<struct reader> &readers
 	}
 }
 
-int read_input(std::vector<source> &sources, char *fname, int maxzoom, int minzoom, int basezoom, double basezoom_marker_width, sqlite3 *outdb, const char *outdir, std::set<std::string> *exclude, std::set<std::string> *include, int exclude_all, json_object *filter, double droprate, int buffer, const char *tmpdir, double gamma, int read_parallel, int forcetable, const char *attribution, bool uses_gamma, long long *file_bbox, const char *prefilter, const char *postfilter, const char *description, bool guess_maxzoom, std::map<std::string, int> const *attribute_types, const char *pgm, std::map<std::string, attribute_op> const *attribute_accum) {
+int read_input(std::vector<source> &sources, char *fname, int maxzoom, int minzoom, int basezoom, double basezoom_marker_width, sqlite3 *outdb, const char *outdir, std::set<std::string> *exclude, std::set<std::string> *include, int exclude_all, json_object *filter, double droprate, int buffer, const char *tmpdir, double gamma, int read_parallel, int forcetable, const char *attribution, bool uses_gamma, long long *file_bbox, const char *prefilter, const char *postfilter, const char *description, bool guess_maxzoom, std::map<std::string, int> const *attribute_types, const char *pgm, std::map<std::string, attribute_op> const *attribute_accum, std::map<std::string, std::string> const &attribute_descriptions) {
 	int ret = EXIT_SUCCESS;
 
 	std::vector<struct reader> readers;
@@ -1303,6 +1304,7 @@ int read_input(std::vector<source> &sources, char *fname, int maxzoom, int minzo
 	std::map<std::string, layermap_entry> layermap;
 	for (size_t l = 0; l < nlayers; l++) {
 		layermap_entry e = layermap_entry(l);
+		e.description = sources[l].description;
 		layermap.insert(std::pair<std::string, layermap_entry>(sources[l].layer, e));
 	}
 
@@ -2297,7 +2299,7 @@ int read_input(std::vector<source> &sources, char *fname, int maxzoom, int minzo
 		ai->second.maxzoom = maxzoom;
 	}
 
-	mbtiles_write_metadata(outdb, outdir, fname, minzoom, maxzoom, minlat, minlon, maxlat, maxlon, midlat, midlon, forcetable, attribution, merged_lm, true, description, !prevent[P_TILE_STATS]);
+	mbtiles_write_metadata(outdb, outdir, fname, minzoom, maxzoom, minlat, minlon, maxlat, maxlon, midlat, midlon, forcetable, attribution, merged_lm, true, description, !prevent[P_TILE_STATS], attribute_descriptions);
 
 	return ret;
 }
@@ -2372,6 +2374,42 @@ void set_attribute_accum(std::map<std::string, attribute_op> &attribute_accum, c
 	attribute_accum.insert(std::pair<std::string, attribute_op>(name, t));
 }
 
+void parse_json_source(const char *arg, struct source &src) {
+	json_pull *jp = json_begin_string(arg);
+	json_object *o = json_read_tree(jp);
+
+	if (o == NULL) {
+		fprintf(stderr, "%s: -L%s: %s\n", *av, arg, jp->error);
+		exit(EXIT_FAILURE);
+	}
+
+	if (o->type != JSON_HASH) {
+		fprintf(stderr, "%s: -L%s: not a JSON object\n", *av, arg);
+		exit(EXIT_FAILURE);
+	}
+
+	json_object *fname = json_hash_get(o, "file");
+	if (fname == NULL || fname->type != JSON_STRING) {
+		fprintf(stderr, "%s: -L%s: requires \"file\": filename\n", *av, arg);
+		exit(EXIT_FAILURE);
+	}
+
+	src.file = std::string(fname->string);
+
+	json_object *layer = json_hash_get(o, "layer");
+	if (layer != NULL && layer->type == JSON_STRING) {
+		src.layer = std::string(layer->string);
+	}
+
+	json_object *description = json_hash_get(o, "description");
+	if (description != NULL && description->type == JSON_STRING) {
+		src.description = std::string(description->string);
+	}
+
+	json_free(o);
+	json_end(jp);
+}
+
 int main(int argc, char **argv) {
 #ifdef MTRACE
 	mtrace();
@@ -2409,6 +2447,7 @@ int main(int argc, char **argv) {
 	std::set<std::string> exclude, include;
 	std::map<std::string, int> attribute_types;
 	std::map<std::string, attribute_op> attribute_accum;
+	std::map<std::string, std::string> attribute_descriptions;
 	int exclude_all = 0;
 	int read_parallel = 0;
 	int files_open_at_start;
@@ -2459,6 +2498,7 @@ int main(int argc, char **argv) {
 
 		{"Modifying feature attributes", 0, 0, 0},
 		{"attribute-type", required_argument, 0, 'T'},
+		{"attribute-description", required_argument, 0, 'Y'},
 		{"accumulate-attribute", required_argument, 0, 'E'},
 
 		{"Filtering features by attributes", 0, 0, 0},
@@ -2605,14 +2645,18 @@ int main(int argc, char **argv) {
 			break;
 
 		case 'L': {
+			struct source src;
+			if (optarg[0] == '{') {
+				parse_json_source(optarg, src);
+			} else {
 				char *cp = strchr(optarg, ':');
 				if (cp == NULL || cp == optarg) {
 					fprintf(stderr, "%s: -L requires layername:file\n", argv[0]);
 					exit(EXIT_FAILURE);
 				}
-			struct source src;
 				src.layer = std::string(optarg).substr(0, cp - optarg);
 				src.file = std::string(cp + 1);
+			}
 			sources.push_back(src);
 			break;
 		}
@@ -2724,6 +2768,17 @@ int main(int argc, char **argv) {
 			exclude_all = 1;
 			break;
 
+		case 'Y': {
+			char *cp = strchr(optarg, ':');
+			if (cp == NULL || cp == optarg) {
+				fprintf(stderr, "%s: -Y requires attribute:description\n", argv[0]);
+				exit(EXIT_FAILURE);
+			}
+			std::string attrib = std::string(optarg).substr(0, cp - optarg);
+			std::string desc = std::string(cp + 1);
+			attribute_descriptions.insert(std::pair<std::string, std::string>(attrib, desc));
+		} break;
+
 		case 'J':
 			filter = read_filter(optarg);
 			break;
@@ -2995,7 +3050,7 @@ int main(int argc, char **argv) {
 
 	long long file_bbox[4] = {UINT_MAX, UINT_MAX, 0, 0};
 
-	ret = read_input(sources, name ? name : out_mbtiles ? out_mbtiles : out_dir, maxzoom, minzoom, basezoom, basezoom_marker_width, outdb, out_dir, &exclude, &include, exclude_all, filter, droprate, buffer, tmpdir, gamma, read_parallel, forcetable, attribution, gamma != 0, file_bbox, prefilter, postfilter, description, guess_maxzoom, &attribute_types, argv[0], &attribute_accum);
+	ret = read_input(sources, name ? name : out_mbtiles ? out_mbtiles : out_dir, maxzoom, minzoom, basezoom, basezoom_marker_width, outdb, out_dir, &exclude, &include, exclude_all, filter, droprate, buffer, tmpdir, gamma, read_parallel, forcetable, attribution, gamma != 0, file_bbox, prefilter, postfilter, description, guess_maxzoom, &attribute_types, argv[0], &attribute_accum, attribute_descriptions);
 
 	if (outdb != NULL) {
 		mbtiles_close(outdb, argv[0]);

man/tippecanoe.1

@@ -159,6 +159,14 @@ or if metadata fields can't be set. You probably don't want to use this.
 specified, the files are all merged into the single named layer, even if they try to specify individual names with \fB\fC\-L\fR\&.
 .IP \(bu 2
 \fB\fC\-L\fR \fIname\fP\fB\fC:\fR\fIfile.json\fP or \fB\fC\-\-named\-layer=\fR\fIname\fP\fB\fC:\fR\fIfile.json\fP: Specify layer names for individual files. If your shell supports it, you can use a subshell redirect like \fB\fC\-L\fR \fIname\fP\fB\fC:<(cat dir/*.json)\fR to specify a layer name for the output of streamed input.
+.IP \(bu 2
+\fB\fC\-L{\fR\fIlayer\-json\fP\fB\fC}\fR or \fB\fC\-\-named\-layer={\fR\fIlayer\-json\fP\fB\fC}\fR: Specify an input file and layer options by a JSON object. The JSON object must contain a \fB\fC"file"\fR key to specify the filename to read from. It may also contain a \fB\fC"layer"\fR field to specify the name of the layer, and/or a \fB\fC"description"\fR field to specify the layer's description in the tileset metadata. Example:
+.RE
+.PP
+.RS
+.nf
+tippecanoe \-z5 \-o world.mbtiles \-L'{"file":"ne_10m_admin_0_countries.json", "layer":"countries", "description":"Natural Earth countries"}'
+.fi
 .RE
 .PP
 CSV input files currently support only Point geometries, from columns named \fB\fClatitude\fR, \fB\fClongitude\fR, \fB\fClat\fR, \fB\fClon\fR, \fB\fClong\fR, \fB\fClng\fR, \fB\fCx\fR, or \fB\fCy\fR\&.
@@ -230,6 +238,8 @@ If the type is \fB\fCbool\fR, then original attributes of \fB\fC0\fR (or, if num
 If the type is \fB\fCfloat\fR or \fB\fCint\fR and the original attribute was non\-numeric, it becomes \fB\fC0\fR\&.
 If the type is \fB\fCint\fR and the original attribute was floating\-point, it is rounded to the nearest integer.
 .IP \(bu 2
+\fB\fC\-Y\fR\fIattribute\fP\fB\fC:\fR\fIdescription\fP or \fB\fC\-\-attribute\-description=\fR\fIattribute\fP\fB\fC:\fR\fIdescription\fP: Set the \fB\fCdescription\fR for the specified attribute in the tileset metadata to \fIdescription\fP instead of the usual \fB\fCString\fR, \fB\fCNumber\fR, or \fB\fCBoolean\fR\&.
+.IP \(bu 2
 \fB\fC\-E\fR\fIattribute\fP\fB\fC:\fR\fIoperation\fP or \fB\fC\-\-accumulate\-attribute=\fR\fIattribute\fP\fB\fC:\fR\fIoperation\fP: Preserve the named \fIattribute\fP from features
 that are dropped, coalesced\-as\-needed, or clustered. The \fIoperation\fP may be
 \fB\fCsum\fR, \fB\fCproduct\fR, \fB\fCmean\fR, \fB\fCmax\fR, \fB\fCmin\fR, \fB\fCconcat\fR, or \fB\fCcomma\fR

mbtiles.cpp

@@ -264,7 +264,7 @@ void tilestats(std::map<std::string, layermap_entry> const &layermap1, size_t el
 	state.json_end_hash();
 }
 
-void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fname, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, double midlat, double midlon, int forcetable, const char *attribution, std::map<std::string, layermap_entry> const &layermap, bool vector, const char *description, bool do_tilestats) {
+void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fname, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, double midlat, double midlon, int forcetable, const char *attribution, std::map<std::string, layermap_entry> const &layermap, bool vector, const char *description, bool do_tilestats, std::map<std::string, std::string> const &attribute_descriptions) {
 	char *sql, *err;
 
 	sqlite3 *db = outdb;
@@ -397,7 +397,7 @@ void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fnam
 				state.json_write_string(lnames[i]);
 
 				state.json_write_string("description");
-				state.json_write_string("");
+				state.json_write_string(fk->second.description);
 
 				state.json_write_string("minzoom");
 				state.json_write_signed(fk->second.minzoom);
@@ -417,6 +417,8 @@ void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fnam
 
 					state.json_write_string(j->first);
 
+					auto f = attribute_descriptions.find(j->first);
+					if (f == attribute_descriptions.end()) {
 						int type = 0;
 						for (auto s : j->second.sample_values) {
 							type |= (1 << s.type);
@@ -431,6 +433,9 @@ void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fnam
 						} else {
 							state.json_write_string("Mixed");
 						}
+					} else {
+						state.json_write_string(f->second);
+					}
 				}
 
 				state.nospace = true;
@@ -550,6 +555,7 @@ std::map<std::string, layermap_entry> merge_layermaps(std::vector<std::map<std::
 				auto out_entry = out.find(layername);
 				out_entry->second.minzoom = map->second.minzoom;
 				out_entry->second.maxzoom = map->second.maxzoom;
+				out_entry->second.description = map->second.description;
 			}
 
 			auto out_entry = out.find(layername);

mbtiles.hpp

@@ -25,6 +25,7 @@ struct layermap_entry {
 	std::map<std::string, type_and_string_stats> file_keys{};
 	int minzoom = 0;
 	int maxzoom = 0;
+	std::string description = "";
 
 	size_t points = 0;
 	size_t lines = 0;
@@ -40,7 +41,7 @@ sqlite3 *mbtiles_open(char *dbname, char **argv, int forcetable);
 
 void mbtiles_write_tile(sqlite3 *outdb, int z, int tx, int ty, const char *data, int size);
 
-void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fname, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, double midlat, double midlon, int forcetable, const char *attribution, std::map<std::string, layermap_entry> const &layermap, bool vector, const char *description, bool do_tilestats);
+void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fname, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, double midlat, double midlon, int forcetable, const char *attribution, std::map<std::string, layermap_entry> const &layermap, bool vector, const char *description, bool do_tilestats, std::map<std::string, std::string> const &attribute_descriptions);
 
 void mbtiles_close(sqlite3 *outdb, const char *pgm);
 

tests/csv/ne_110m_populated_places_simple.csv

@@ -239,10 +239,10 @@ scalerank,natscale,labelrank,featurecla,name,namepar,namealt,diffascii,nameascii
 0,600,1,Admin-1 capital,Kolkata,Calcutta,,0,Kolkata,0.00000000000,,,0.00000000000,1,India,IND,India,IND,West Bengal,IN,,22.49496929830,88.32467565810,4.00000000000,1,Name changed. Changed scale rank.,14787000,4631392,7783716,14,12,1275004.00000000000,Kolkata,Calcutta,1,0,3.7
 0,600,1,Admin-1 capital,Rio de Janeiro,,,0,Rio de Janeiro,0.00000000000,,,1.00000000000,1,Brazil,BRA,Brazil,BRA,Rio de Janeiro,BR,,-22.92502317420,-43.22502079420,0.00000000000,0,,11748000,2010175,1821489,14,12,3451190.00000000000,Rio de Janeiro,Rio de Janeiro,1,0,1.7
 0,600,1,Admin-1 capital,São Paulo,,Sao Paulo|Sio Paulo,0,Sao Paulo,0.00000000000,,,1.00000000000,1,Brazil,BRA,Brazil,BRA,São Paulo,BR,,-23.55867958700,-46.62501998040,0.00000000000,0,,18845000,10021295,11522944,14,14,3448439.00000000000,S,Sao Paolo,1,0,3.0
-0,600,3,Admin-1 capital,Sydney,,,0,Sydney,0.00000000000,,,1.00000000000,1,Australia,AUS,Australia,AUS,New South Wales,AU,,-33.92001096720,151.18517980900,4.00000000000,0,Changed feature class.,4630000,3641422,2669348,12,12,2147714.00000000000,Sydney,Sydney1,1,0,1.7
+0,600,3,Admin-1 capital,Sydney,,,0,Sydney,0.00000000000,,,1.00000000000,1,Australia,AUS,Australia,AUS,New South Wales,AU,,-33.92001096720,151.18517980900,4.00000000000,0,Changed feature class.,4630000,3641422,2669348,12,12,2147714.00000000000,Sydney,Sydney1,1,0,
 0,600,0,Admin-0 capital,Singapore,,,0,Singapore,1.00000000000,,,1.00000000000,1,Singapore,SGP,Singapore,SGP,,SG,,1.29303346649,103.85582067800,0.00000000000,0,,5183700,3289529,3314179,13,12,1880252.00000000000,Singapore,Singapore,1,5,2.1
 0,600,0,Admin-0 region capital,Hong Kong,,,0,Hong Kong,0.00000000000,,,1.00000000000,1,China,CHN,Hong Kong S.A.R.,HKG,,HK,,22.30498089500,114.18500931700,0.00000000000,0,,7206000,4551579,4549026,13,12,1819729.00000000000,Hong Kong,Hong Kong,1,0,3.0
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 0,600,0,Admin-0 region capital,Hong Kong,,,0,Hong Kong,0.00000000000,,,1.00000000000,1,China,CHN,Hong Kong S.A.R.,HKG,,HK,,nan,114.18500931700,0.00000000000,0,,7206000,4551579,4549026,13,12,1819729.00000000000,Hong Kong,Hong Kong,1,0,3.0
 0,600,0,Admin-0 region capital,Hong Kong,,,0,Hong Kong,0.00000000000,,,1.00000000000,1,China,CHN,Hong Kong S.A.R.,HKG,,HK,,inf,114.18500931700,0.00000000000,0,,7206000,4551579,4549026,13,12,1819729.00000000000,Hong Kong,Hong Kong,1,0,3.0
 0,600,0,Admin-0 region capital,Hong Kong,,,0,Hong Kong,0.00000000000,,,1.00000000000,1,China,CHN,Hong Kong S.A.R.,HKG,,HK,,22.30498089500,nan,0.00000000000,0,,7206000,4551579,4549026,13,12,1819729.00000000000,Hong Kong,Hong Kong,1,0,3.0

tests/join-population/joined-no-tile-stats.mbtiles.json

@@ -3,7 +3,7 @@
 "center": "-122.299805,37.892187,12",
 "description": "tests/join-population/tabblock_06001420.mbtiles",
 "format": "pbf",
-"json": "{\"vector_layers\": [ { \"id\": \"tabblock_06001420\", \"description\": \"\", \"minzoom\": 3, \"maxzoom\": 12, \"fields\": {\"ALAND10\": \"Number\", \"AWATER10\": \"Number\", \"BLOCKCE10\": \"String\", \"COUNTYFP10\": \"String\", \"FUNCSTAT10\": \"String\", \"INTPTLAT10\": \"String\", \"INTPTLON10\": \"String\", \"MTFCC10\": \"String\", \"NAME10\": \"String\", \"STATEFP10\": \"String\", \"TRACTCE10\": \"String\", \"UACE10\": \"String\", \"UATYP10\": \"String\", \"UR10\": \"String\", \"population\": \"Number\"} } ]}",
+"json": "{\"vector_layers\": [ { \"id\": \"tabblock_06001420\", \"description\": \"population\", \"minzoom\": 3, \"maxzoom\": 12, \"fields\": {\"ALAND10\": \"Land area\", \"AWATER10\": \"Number\", \"BLOCKCE10\": \"String\", \"COUNTYFP10\": \"String\", \"FUNCSTAT10\": \"String\", \"INTPTLAT10\": \"String\", \"INTPTLON10\": \"String\", \"MTFCC10\": \"String\", \"NAME10\": \"String\", \"STATEFP10\": \"String\", \"TRACTCE10\": \"String\", \"UACE10\": \"String\", \"UATYP10\": \"String\", \"UR10\": \"String\", \"population\": \"Mixed\"} } ]}",
 "maxzoom": "12",
 "minzoom": "0",
 "name": "tests/join-population/tabblock_06001420.mbtiles",
@@ -472,7 +472,7 @@
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3017", "population": 12, "NAME10": "Block 3017", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 6343, "AWATER10": 0, "INTPTLAT10": "+37.884079", "INTPTLON10": "-122.290980" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290878, 37.885693 ], [ -122.290878, 37.884609 ], [ -122.292252, 37.884609 ], [ -122.292252, 37.885693 ], [ -122.290878, 37.885693 ] ] ] } }
 ,
-{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": 32, "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.884067 ], [ -122.290192, 37.882983 ], [ -122.291565, 37.882983 ], [ -122.291565, 37.884067 ], [ -122.290192, 37.884067 ] ] ] } }
+{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": "", "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.884067 ], [ -122.290192, 37.882983 ], [ -122.291565, 37.882983 ], [ -122.291565, 37.884067 ], [ -122.290192, 37.884067 ] ] ] } }
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "1023", "population": 41, "NAME10": "Block 1023", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 15260, "AWATER10": 0, "INTPTLAT10": "+37.884009", "INTPTLON10": "-122.289530" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.288818, 37.885151 ], [ -122.289505, 37.883525 ], [ -122.290192, 37.883525 ], [ -122.290192, 37.885151 ], [ -122.288818, 37.885151 ] ] ] } }
 ,
@@ -880,7 +880,7 @@
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420500", "BLOCKCE10": "2016", "NAME10": "Block 2016", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 5264, "AWATER10": 0, "INTPTLAT10": "+37.883995", "INTPTLON10": "-122.291315" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.291565, 37.885151 ], [ -122.291222, 37.883254 ], [ -122.291908, 37.884880 ], [ -122.291565, 37.885151 ] ] ] } }
 ,
-{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": 32, "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.885422 ], [ -122.289848, 37.884609 ], [ -122.290535, 37.883254 ], [ -122.291222, 37.885151 ], [ -122.290192, 37.885422 ] ] ] } }
+{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": "", "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.885422 ], [ -122.289848, 37.884609 ], [ -122.290535, 37.883254 ], [ -122.291222, 37.885151 ], [ -122.290192, 37.885422 ] ] ] } }
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "2016", "NAME10": "Block 2016", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 1094, "AWATER10": 0, "INTPTLAT10": "+37.885399", "INTPTLON10": "-122.289471" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.289162, 37.886235 ], [ -122.289162, 37.885693 ], [ -122.289848, 37.885693 ], [ -122.289848, 37.886235 ], [ -122.289162, 37.886235 ] ] ] } }
 ,
@@ -1344,7 +1344,7 @@
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420500", "BLOCKCE10": "2016", "NAME10": "Block 2016", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 5264, "AWATER10": 0, "INTPTLAT10": "+37.883995", "INTPTLON10": "-122.291315" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.291565, 37.885015 ], [ -122.290878, 37.883389 ], [ -122.291222, 37.883254 ], [ -122.291393, 37.883254 ], [ -122.291908, 37.884880 ], [ -122.291565, 37.885015 ] ] ] } }
 ,
-{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": 32, "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.885286 ], [ -122.289848, 37.884609 ], [ -122.290363, 37.883119 ], [ -122.290535, 37.883254 ], [ -122.291222, 37.885015 ], [ -122.290192, 37.885286 ] ] ] } }
+{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": "", "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.885286 ], [ -122.289848, 37.884609 ], [ -122.290363, 37.883119 ], [ -122.290535, 37.883254 ], [ -122.291222, 37.885015 ], [ -122.290192, 37.885286 ] ] ] } }
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "2016", "NAME10": "Block 2016", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 1094, "AWATER10": 0, "INTPTLAT10": "+37.885399", "INTPTLON10": "-122.289471" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.289677, 37.885964 ], [ -122.289333, 37.885964 ], [ -122.289333, 37.885557 ], [ -122.289677, 37.885557 ], [ -122.289677, 37.885964 ] ] ] } }
 ,
@@ -1856,7 +1856,7 @@
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420500", "BLOCKCE10": "2016", "NAME10": "Block 2016", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 5264, "AWATER10": 0, "INTPTLAT10": "+37.883995", "INTPTLON10": "-122.291315" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.291565, 37.884948 ], [ -122.290878, 37.883322 ], [ -122.291136, 37.883254 ], [ -122.291307, 37.883254 ], [ -122.291822, 37.884880 ], [ -122.291565, 37.884948 ] ] ] } }
 ,
-{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": 32, "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.885219 ], [ -122.289848, 37.884541 ], [ -122.290363, 37.883051 ], [ -122.290449, 37.883254 ], [ -122.291222, 37.885015 ], [ -122.290192, 37.885219 ] ] ] } }
+{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": "", "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.885219 ], [ -122.289848, 37.884541 ], [ -122.290363, 37.883051 ], [ -122.290449, 37.883254 ], [ -122.291222, 37.885015 ], [ -122.290192, 37.885219 ] ] ] } }
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "2016", "NAME10": "Block 2016", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 1094, "AWATER10": 0, "INTPTLAT10": "+37.885399", "INTPTLON10": "-122.289471" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.289333, 37.885896 ], [ -122.289677, 37.884880 ], [ -122.289762, 37.884948 ], [ -122.289333, 37.885896 ] ] ] } }
 ,
@@ -2380,7 +2380,7 @@
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420500", "BLOCKCE10": "2016", "NAME10": "Block 2016", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 5264, "AWATER10": 0, "INTPTLAT10": "+37.883995", "INTPTLON10": "-122.291315" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.291522, 37.884914 ], [ -122.290835, 37.883322 ], [ -122.291093, 37.883254 ], [ -122.291265, 37.883254 ], [ -122.291780, 37.884880 ], [ -122.291522, 37.884914 ] ] ] } }
 ,
-{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": 32, "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.885219 ], [ -122.289848, 37.884507 ], [ -122.290320, 37.883051 ], [ -122.290320, 37.883220 ], [ -122.290406, 37.883220 ], [ -122.291179, 37.884981 ], [ -122.290192, 37.885219 ] ] ] } }
+{ "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "3018", "population": "", "NAME10": "Block 3018", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 14557, "AWATER10": 0, "INTPTLAT10": "+37.884369", "INTPTLON10": "-122.290441" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.290192, 37.885219 ], [ -122.289848, 37.884507 ], [ -122.290320, 37.883051 ], [ -122.290320, 37.883220 ], [ -122.290406, 37.883220 ], [ -122.291179, 37.884981 ], [ -122.290192, 37.885219 ] ] ] } }
 ,
 { "type": "Feature", "properties": { "STATEFP10": "06", "COUNTYFP10": "001", "TRACTCE10": "420600", "BLOCKCE10": "2016", "NAME10": "Block 2016", "MTFCC10": "G5040", "UR10": "U", "UACE10": "78904", "UATYP10": "U", "FUNCSTAT10": "S", "ALAND10": 1094, "AWATER10": 0, "INTPTLAT10": "+37.885399", "INTPTLON10": "-122.289471" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ -122.289333, 37.885998 ], [ -122.289290, 37.885862 ], [ -122.289634, 37.884880 ], [ -122.289720, 37.884914 ], [ -122.289333, 37.885998 ] ] ] } }
 ,

tests/join-population/population.csv

@@ -160,4 +160,4 @@ GEOID10, population
 "060014206003014",66
 "060014206003015",15
 "060014206003017",12
-"060014206003018",32
+"060014206003018",

tests/join-population/tabblock_06001420.json.sort.joined.standard

@@ -257,4 +257,4 @@
 {"type":"Feature","properties":{"STATEFP10":"06","COUNTYFP10":"001","TRACTCE10":"420600","BLOCKCE10":"3015","GEOID10":"060014206003015","NAME10":"Block 3015","MTFCC10":"G5040","UR10":"U","UACE10":"78904","UATYP10":"U","FUNCSTAT10":"S","ALAND10":10776.000000,"AWATER10":0.000000,"INTPTLAT10":"+37.886322","INTPTLON10":"-122.291817","population":15},"geometry":{"type":"Polygon","coordinates":[[[-122.292106,37.887778],[-122.29117,37.884974],[-122.291516,37.884897],[-122.291677,37.885275],[-122.291733,37.885447],[-122.292038,37.886378],[-122.292198,37.886874],[-122.292278,37.887138],[-122.29245,37.887705],[-122.292381,37.887719],[-122.292174,37.887763],[-122.292106,37.887778]]]}}
 {"type":"Feature","properties":{"STATEFP10":"06","COUNTYFP10":"001","TRACTCE10":"420600","BLOCKCE10":"3016","GEOID10":"060014206003016","NAME10":"Block 3016","MTFCC10":"G5040","UR10":"U","UACE10":"78904","UATYP10":"U","FUNCSTAT10":"S","ALAND10":253.000000,"AWATER10":0.000000,"INTPTLAT10":"+37.887776","INTPTLON10":"-122.292289"},"geometry":{"type":"Polygon","coordinates":[[[-122.292473,37.887775],[-122.292129,37.887848],[-122.292106,37.887778],[-122.292174,37.887763],[-122.292381,37.887719],[-122.29245,37.887705],[-122.292473,37.887775]]]}}
 {"type":"Feature","properties":{"STATEFP10":"06","COUNTYFP10":"001","TRACTCE10":"420600","BLOCKCE10":"3017","GEOID10":"060014206003017","NAME10":"Block 3017","MTFCC10":"G5040","UR10":"U","UACE10":"78904","UATYP10":"U","FUNCSTAT10":"S","ALAND10":6343.000000,"AWATER10":0.000000,"INTPTLAT10":"+37.884079","INTPTLON10":"-122.290980","population":12},"geometry":{"type":"Polygon","coordinates":[[[-122.29117,37.884974],[-122.291107,37.884764],[-122.290933,37.884357],[-122.290817,37.88414],[-122.290383,37.883205],[-122.290831,37.883311],[-122.291152,37.883996],[-122.291358,37.884474],[-122.291516,37.884897],[-122.29117,37.884974]]]}}
-{"type":"Feature","properties":{"STATEFP10":"06","COUNTYFP10":"001","TRACTCE10":"420600","BLOCKCE10":"3018","GEOID10":"060014206003018","NAME10":"Block 3018","MTFCC10":"G5040","UR10":"U","UACE10":"78904","UATYP10":"U","FUNCSTAT10":"S","ALAND10":14557.000000,"AWATER10":0.000000,"INTPTLAT10":"+37.884369","INTPTLON10":"-122.290441","population":32},"geometry":{"type":"Polygon","coordinates":[[[-122.290383,37.883205],[-122.290817,37.88414],[-122.290933,37.884357],[-122.291107,37.884764],[-122.29117,37.884974],[-122.290166,37.885213],[-122.290031,37.884888],[-122.289845,37.884492],[-122.290151,37.883572],[-122.290231,37.883308],[-122.29028,37.883025],[-122.290283,37.883037],[-122.290316,37.883189],[-122.290383,37.883205]]]}}
+{"type":"Feature","properties":{"STATEFP10":"06","COUNTYFP10":"001","TRACTCE10":"420600","BLOCKCE10":"3018","GEOID10":"060014206003018","NAME10":"Block 3018","MTFCC10":"G5040","UR10":"U","UACE10":"78904","UATYP10":"U","FUNCSTAT10":"S","ALAND10":14557.000000,"AWATER10":0.000000,"INTPTLAT10":"+37.884369","INTPTLON10":"-122.290441","population":""},"geometry":{"type":"Polygon","coordinates":[[[-122.290383,37.883205],[-122.290817,37.88414],[-122.290933,37.884357],[-122.291107,37.884764],[-122.29117,37.884974],[-122.290166,37.885213],[-122.290031,37.884888],[-122.289845,37.884492],[-122.290151,37.883572],[-122.290231,37.883308],[-122.29028,37.883025],[-122.290283,37.883037],[-122.290316,37.883189],[-122.290383,37.883205]]]}}

tests/layer-json/out.mbtiles.json

@@ -0,0 +1,502 @@
+{ "type": "FeatureCollection", "properties": {
+"bounds": "-175.220564,-41.299973,179.216647,64.150023",
+"center": "0.000000,0.000000,0",
+"description": "tests/layer-json/out.mbtiles",
+"format": "pbf",
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tests/ne_110m_populated_places/out/-z0_-r1_-yNAME_-ySOV0NAME_-yELEVATION_-YNAME@City_-YSOV0NAME@Country.json

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+{ "type": "Feature", "properties": { "NAME": "Port Moresby", "SOV0NAME": "Papua New Guinea", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 147.128906, -9.449062 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Melbourne", "SOV0NAME": "Australia", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 144.931641, -37.788081 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Sydney", "SOV0NAME": "Australia", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 151.171875, -33.870416 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Canberra", "SOV0NAME": "Australia", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 149.062500, -35.245619 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Honiara", "SOV0NAME": "Solomon Islands", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 159.873047, -9.362353 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Port Vila", "SOV0NAME": "Vanuatu", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 168.310547, -17.727759 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Funafuti", "SOV0NAME": "Tuvalu", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 179.208984, -8.494105 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Suva", "SOV0NAME": "Fiji", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 178.417969, -18.062312 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Auckland", "SOV0NAME": "New Zealand", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 174.726562, -36.809285 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Wellington", "SOV0NAME": "New Zealand", "ELEVATION": 0 }, "geometry": { "type": "Point", "coordinates": [ 174.726562, -41.244772 ] } }
+] }
+] }
+] }

tile-join.cpp

@@ -573,7 +573,46 @@ void handle_tasks(std::map<zxy, std::vector<std::string>> &tasks, std::vector<st
 	}
 }
 
-void decode(struct reader *readers, std::map<std::string, layermap_entry> &layermap, sqlite3 *outdb, const char *outdir, struct stats *st, std::vector<std::string> &header, std::map<std::string, std::vector<std::string>> &mapping, std::set<std::string> &exclude, int ifmatched, std::string &attribution, std::string &description, std::set<std::string> &keep_layers, std::set<std::string> &remove_layers, std::string &name, json_object *filter) {
+void handle_vector_layers(json_object *vector_layers, std::map<std::string, layermap_entry> &layermap, std::map<std::string, std::string> &attribute_descriptions) {
+	if (vector_layers != NULL && vector_layers->type == JSON_ARRAY) {
+		for (size_t i = 0; i < vector_layers->length; i++) {
+			if (vector_layers->array[i]->type == JSON_HASH) {
+				json_object *id = json_hash_get(vector_layers->array[i], "id");
+				json_object *desc = json_hash_get(vector_layers->array[i], "description");
+
+				if (id != NULL && desc != NULL && id->type == JSON_STRING && desc->type == JSON_STRING) {
+					std::string sid = id->string;
+					std::string sdesc = desc->string;
+
+					if (sdesc.size() != 0) {
+						auto f = layermap.find(sid);
+						if (f != layermap.end()) {
+							f->second.description = sdesc;
+						}
+					}
+				}
+
+				json_object *fields = json_hash_get(vector_layers->array[i], "fields");
+				if (fields != NULL && fields->type == JSON_HASH) {
+					for (size_t j = 0; j < fields->length; j++) {
+						if (fields->keys[j]->type == JSON_STRING && fields->values[j]->type) {
+							const char *desc2 = fields->values[j]->string;
+
+							if (strcmp(desc2, "Number") != 0 &&
+							    strcmp(desc2, "String") != 0 &&
+							    strcmp(desc2, "Boolean") != 0 &&
+							    strcmp(desc2, "Mixed") != 0) {
+								attribute_descriptions.insert(std::pair<std::string, std::string>(fields->keys[j]->string, desc2));
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+}
+
+void decode(struct reader *readers, std::map<std::string, layermap_entry> &layermap, sqlite3 *outdb, const char *outdir, struct stats *st, std::vector<std::string> &header, std::map<std::string, std::vector<std::string>> &mapping, std::set<std::string> &exclude, int ifmatched, std::string &attribution, std::string &description, std::set<std::string> &keep_layers, std::set<std::string> &remove_layers, std::string &name, json_object *filter, std::map<std::string, std::string> &attribute_descriptions) {
 	std::vector<std::map<std::string, layermap_entry>> layermaps;
 	for (size_t i = 0; i < CPUS; i++) {
 		layermaps.push_back(std::map<std::string, layermap_entry>());
@@ -749,6 +788,27 @@ void decode(struct reader *readers, std::map<std::string, layermap_entry> &layer
 			}
 			sqlite3_finalize(r->stmt);
 		}
+		if (sqlite3_prepare_v2(db, "SELECT value from metadata where name = 'json'", -1, &r->stmt, NULL) == SQLITE_OK) {
+			if (sqlite3_step(r->stmt) == SQLITE_ROW) {
+				const unsigned char *s = sqlite3_column_text(r->stmt, 0);
+
+				if (s != NULL) {
+					json_pull *jp = json_begin_string((const char *) s);
+					json_object *o = json_read_tree(jp);
+
+					if (o != NULL && o->type == JSON_HASH) {
+						json_object *vector_layers = json_hash_get(o, "vector_layers");
+
+						handle_vector_layers(vector_layers, layermap, attribute_descriptions);
+						json_free(o);
+					}
+
+					json_end(jp);
+				}
+			}
+
+			sqlite3_finalize(r->stmt);
+		}
 
 		// Closes either real db or temp mirror of metadata.json
 		if (sqlite3_close(db) != SQLITE_OK) {
@@ -990,7 +1050,9 @@ int main(int argc, char **argv) {
 		*rr = r;
 	}
 
-	decode(readers, layermap, outdb, out_dir, &st, header, mapping, exclude, ifmatched, attribution, description, keep_layers, remove_layers, name, filter);
+	std::map<std::string, std::string> attribute_descriptions;
+
+	decode(readers, layermap, outdb, out_dir, &st, header, mapping, exclude, ifmatched, attribution, description, keep_layers, remove_layers, name, filter, attribute_descriptions);
 
 	if (set_attribution.size() != 0) {
 		attribution = set_attribution;
@@ -1002,7 +1064,7 @@ int main(int argc, char **argv) {
 		name = set_name;
 	}
 
-	mbtiles_write_metadata(outdb, out_dir, name.c_str(), st.minzoom, st.maxzoom, st.minlat, st.minlon, st.maxlat, st.maxlon, st.midlat, st.midlon, 0, attribution.size() != 0 ? attribution.c_str() : NULL, layermap, true, description.c_str(), !pg);
+	mbtiles_write_metadata(outdb, out_dir, name.c_str(), st.minzoom, st.maxzoom, st.minlat, st.minlon, st.maxlat, st.maxlon, st.midlat, st.midlon, 0, attribution.size() != 0 ? attribution.c_str() : NULL, layermap, true, description.c_str(), !pg, attribute_descriptions);
 
 	if (outdb != NULL) {
 		mbtiles_close(outdb, argv[0]);

version.hpp

@@ -1,6 +1,6 @@
 #ifndef VERSION_HPP
 #define VERSION_HPP
 
-#define VERSION "tippecanoe v1.28.1\n"
+#define VERSION "tippecanoe v1.29.0\n"
 
 #endif