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Better maxzoom guessing by considering resolution within features

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This commit is contained in:
Eric Fischer
2017-05-30 13:28:25 -07:00
parent 5db7b504e8
commit 331707f88a
4 changed files with 85 additions and 1013 deletions
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geojson.cpp
+31 -6
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@@ -184,7 +184,7 @@ long long parse_geometry(int t, json_object *j, long long *bbox, drawvec &out, i
return g;
}
int serialize_geometry(json_object *geometry, json_object *properties, json_object *id, const char *reading, int line, volatile long long *layer_seq, volatile long long *progress_seq, long long *metapos, long long *geompos, long long *indexpos, std::set<std::string> *exclude, std::set<std::string> *include, int exclude_all, FILE *metafile, FILE *geomfile, FILE *indexfile, struct memfile *poolfile, struct memfile *treefile, const char *fname, int basezoom, int layer, double droprate, long long *file_bbox, json_object *tippecanoe, int segment, int *initialized, unsigned *initial_x, unsigned *initial_y, struct reader *readers, int maxzoom, json_object *feature, std::map<std::string, layermap_entry> *layermap, std::string layername, bool uses_gamma, std::map<std::string, int> const *attribute_types) {
int serialize_geometry(json_object *geometry, json_object *properties, json_object *id, const char *reading, int line, volatile long long *layer_seq, volatile long long *progress_seq, long long *metapos, long long *geompos, long long *indexpos, std::set<std::string> *exclude, std::set<std::string> *include, int exclude_all, FILE *metafile, FILE *geomfile, FILE *indexfile, struct memfile *poolfile, struct memfile *treefile, const char *fname, int basezoom, int layer, double droprate, long long *file_bbox, json_object *tippecanoe, int segment, int *initialized, unsigned *initial_x, unsigned *initial_y, struct reader *readers, int maxzoom, json_object *feature, std::map<std::string, layermap_entry> *layermap, std::string layername, bool uses_gamma, std::map<std::string, int> const *attribute_types, double *dist_sum, size_t *dist_count) {
json_object *geometry_type = json_hash_get(geometry, "type");
if (geometry_type == NULL) {
static int warned = 0;
@@ -425,6 +425,31 @@ int serialize_geometry(json_object *geometry, json_object *properties, json_obje
dv = fix_polygon(dv);
}
std::vector<unsigned long long> locs;
for (size_t i = 0; i < dv.size(); i++) {
if (dv[i].op == VT_MOVETO || dv[i].op == VT_LINETO) {
locs.push_back(encode(dv[i].x << geometry_scale, dv[i].y << geometry_scale));
}
}
std::sort(locs.begin(), locs.end());
size_t n = 0;
double sum = 0;
for (size_t i = 1; i < locs.size(); i++) {
if (locs[i - 1] != locs[i]) {
sum += log(locs[i] - locs[i - 1]);
n++;
}
}
if (n > 0) {
double avg = exp(sum / n);
// Convert approximately from tile units to feet
double dist_ft = sqrt(avg) / 33;
*dist_sum += log(dist_ft) * n;
*dist_count += n;
}
locs.clear();
bool inline_meta = true;
// Don't inline metadata for features that will span several tiles at maxzoom
if (g > 0 && (bbox[2] < bbox[0] || bbox[3] < bbox[1])) {
@@ -575,7 +600,7 @@ void check_crs(json_object *j, const char *reading) {
}
}
void parse_json(json_pull *jp, const char *reading, volatile long long *layer_seq, volatile long long *progress_seq, long long *metapos, long long *geompos, long long *indexpos, std::set<std::string> *exclude, std::set<std::string> *include, int exclude_all, FILE *metafile, FILE *geomfile, FILE *indexfile, struct memfile *poolfile, struct memfile *treefile, char *fname, int basezoom, int layer, double droprate, long long *file_bbox, int segment, int *initialized, unsigned *initial_x, unsigned *initial_y, struct reader *readers, int maxzoom, std::map<std::string, layermap_entry> *layermap, std::string layername, bool uses_gamma, std::map<std::string, int> const *attribute_types) {
void parse_json(json_pull *jp, const char *reading, volatile long long *layer_seq, volatile long long *progress_seq, long long *metapos, long long *geompos, long long *indexpos, std::set<std::string> *exclude, std::set<std::string> *include, int exclude_all, FILE *metafile, FILE *geomfile, FILE *indexfile, struct memfile *poolfile, struct memfile *treefile, char *fname, int basezoom, int layer, double droprate, long long *file_bbox, int segment, int *initialized, unsigned *initial_x, unsigned *initial_y, struct reader *readers, int maxzoom, std::map<std::string, layermap_entry> *layermap, std::string layername, bool uses_gamma, std::map<std::string, int> const *attribute_types, double *dist_sum, size_t *dist_count) {
long long found_hashes = 0;
long long found_features = 0;
long long found_geometries = 0;
@@ -643,7 +668,7 @@ void parse_json(json_pull *jp, const char *reading, volatile long long *layer_se
}
found_geometries++;
serialize_geometry(j, NULL, NULL, reading, jp->line, layer_seq, progress_seq, metapos, geompos, indexpos, exclude, include, exclude_all, metafile, geomfile, indexfile, poolfile, treefile, fname, basezoom, layer, droprate, file_bbox, NULL, segment, initialized, initial_x, initial_y, readers, maxzoom, j, layermap, layername, uses_gamma, attribute_types);
serialize_geometry(j, NULL, NULL, reading, jp->line, layer_seq, progress_seq, metapos, geompos, indexpos, exclude, include, exclude_all, metafile, geomfile, indexfile, poolfile, treefile, fname, basezoom, layer, droprate, file_bbox, NULL, segment, initialized, initial_x, initial_y, readers, maxzoom, j, layermap, layername, uses_gamma, attribute_types, dist_sum, dist_count);
json_free(j);
continue;
}
@@ -686,10 +711,10 @@ void parse_json(json_pull *jp, const char *reading, volatile long long *layer_se
if (geometries != NULL) {
size_t g;
for (g = 0; g < geometries->length; g++) {
serialize_geometry(geometries->array[g], properties, id, reading, jp->line, layer_seq, progress_seq, metapos, geompos, indexpos, exclude, include, exclude_all, metafile, geomfile, indexfile, poolfile, treefile, fname, basezoom, layer, droprate, file_bbox, tippecanoe, segment, initialized, initial_x, initial_y, readers, maxzoom, j, layermap, layername, uses_gamma, attribute_types);
serialize_geometry(geometries->array[g], properties, id, reading, jp->line, layer_seq, progress_seq, metapos, geompos, indexpos, exclude, include, exclude_all, metafile, geomfile, indexfile, poolfile, treefile, fname, basezoom, layer, droprate, file_bbox, tippecanoe, segment, initialized, initial_x, initial_y, readers, maxzoom, j, layermap, layername, uses_gamma, attribute_types, dist_sum, dist_count);
}
} else {
serialize_geometry(geometry, properties, id, reading, jp->line, layer_seq, progress_seq, metapos, geompos, indexpos, exclude, include, exclude_all, metafile, geomfile, indexfile, poolfile, treefile, fname, basezoom, layer, droprate, file_bbox, tippecanoe, segment, initialized, initial_x, initial_y, readers, maxzoom, j, layermap, layername, uses_gamma, attribute_types);
serialize_geometry(geometry, properties, id, reading, jp->line, layer_seq, progress_seq, metapos, geompos, indexpos, exclude, include, exclude_all, metafile, geomfile, indexfile, poolfile, treefile, fname, basezoom, layer, droprate, file_bbox, tippecanoe, segment, initialized, initial_x, initial_y, readers, maxzoom, j, layermap, layername, uses_gamma, attribute_types, dist_sum, dist_count);
}
json_free(j);
@@ -701,7 +726,7 @@ void parse_json(json_pull *jp, const char *reading, volatile long long *layer_se
void *run_parse_json(void *v) {
struct parse_json_args *pja = (struct parse_json_args *) v;
parse_json(pja->jp, pja->reading, pja->layer_seq, pja->progress_seq, pja->metapos, pja->geompos, pja->indexpos, pja->exclude, pja->include, pja->exclude_all, pja->metafile, pja->geomfile, pja->indexfile, pja->poolfile, pja->treefile, pja->fname, pja->basezoom, pja->layer, pja->droprate, pja->file_bbox, pja->segment, pja->initialized, pja->initial_x, pja->initial_y, pja->readers, pja->maxzoom, pja->layermap, *pja->layername, pja->uses_gamma, pja->attribute_types);
parse_json(pja->jp, pja->reading, pja->layer_seq, pja->progress_seq, pja->metapos, pja->geompos, pja->indexpos, pja->exclude, pja->include, pja->exclude_all, pja->metafile, pja->geomfile, pja->indexfile, pja->poolfile, pja->treefile, pja->fname, pja->basezoom, pja->layer, pja->droprate, pja->file_bbox, pja->segment, pja->initialized, pja->initial_x, pja->initial_y, pja->readers, pja->maxzoom, pja->layermap, *pja->layername, pja->uses_gamma, pja->attribute_types, pja->dist_sum, pja->dist_count);
return NULL;
}