Add option to remove geometry in tile-join (#382)

add option to remove geometry in `tile-join`

Co-authored-by: indus <stefan.keim@posteo.de>

mvt.cpp

@@ -407,6 +407,7 @@ std::string mvt_tile::encode() {
 			std::string feature_string;
 			protozero::pbf_writer feature_writer(feature_string);
 
+			if (layers[i].features[f].type >= 0) 
 				feature_writer.add_enum(3, layers[i].features[f].type);
 
 			std::vector<unsigned> sorted_tags = layers[i].features[f].tags;

tile-join.cpp

@@ -56,6 +56,7 @@ int minzoom = 0;
 std::map<std::string, std::string> renames;
 bool exclude_all = false;
 bool exclude_all_tile_attributes = false;
+bool exclude_all_tile_geometries = false;
 std::vector<std::string> unidecode_data;
 
 bool want_overzoom = false;
@@ -323,6 +324,9 @@ void append_tile(std::string message, int z, unsigned x, unsigned y, std::map<st
 					}
 				}
 
+				if (exclude_all_tile_geometries) {
+					outfeature.type = -1;
+				} else {
 					outfeature.type = feat.type;
 					outfeature.geometry = feat.geometry;
 
@@ -361,6 +365,7 @@ void append_tile(std::string message, int z, unsigned x, unsigned y, std::map<st
 							maxx2 = std::max(maxx2, gx);
 						}
 					}
+				}
 
 				features_added++;
 				features_added_to_layer = true;
@@ -1309,6 +1314,7 @@ int main(int argc, char **argv) {
 		{"exclude-all", no_argument, 0, 'X'},
 		{"include", required_argument, 0, 'y'},
 		{"exclude-all-tile-attributes", no_argument, 0, '~'},
+		{"exclude-all-tile-geometries", no_argument, 0, '~'},
 		{"layer", required_argument, 0, 'l'},
 		{"exclude-layer", required_argument, 0, 'L'},
 		{"quiet", no_argument, 0, 'q'},
@@ -1507,6 +1513,8 @@ int main(int argc, char **argv) {
 				unidecode_data = read_unidecode(optarg);
 			} else if (strcmp(opt, "exclude-all-tile-attributes") == 0) {
 				exclude_all_tile_attributes = true;
+			} else if (strcmp(opt, "exclude-all-tile-geometries") == 0) {
+				exclude_all_tile_geometries = true;
 			} else {
 				fprintf(stderr, "%s: Unrecognized option --%s\n", argv[0], opt);
 				exit(EXIT_ARGS);