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Drop or coalesce points too when dropping or coalescing smallest (#6)

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* Handle points too when dropping or coalescing the "smallest" features.

* Add statistics of tile size reduction strategies to tileset metadata

* Update changelog and version

* Update documentation
This commit is contained in:
Erica Fischer
2022-08-09 15:29:03 -07:00
committed by GitHub
parent 67cd9d8d85
commit c65d6938a4
63 changed files with 574 additions and 18 deletions
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serial.cpp
+7 -2
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@@ -531,14 +531,19 @@ int serialize_feature(struct serialization_state *sst, serial_feature &sf) {
}
}
} else if (sf.t == VT_LINE) {
double dist = 0;
for (size_t i = 1; i < sf.geometry.size(); i++) {
if (sf.geometry[i].op == VT_LINETO) {
double xd = sf.geometry[i].x - sf.geometry[i - 1].x;
double yd = sf.geometry[i].y - sf.geometry[i - 1].y;
extent += sqrt(xd * xd + yd * yd);
dist += sqrt(xd * xd + yd * yd);
}
}
// treat lines as having the area of a circle with the line as diameter
extent = M_PI * (dist / 2) * (dist / 2);
}
// VT_POINT extent will be calculated in write_tile from the distance between adjacent features.
}
if (extent <= LLONG_MAX) {
@@ -559,7 +564,7 @@ int serialize_feature(struct serialization_state *sst, serial_feature &sf) {
long long midy = (sf.bbox[1] / 2 + sf.bbox[3] / 2) & ((1LL << 32) - 1);
bbox_index = encode_index(midx, midy);
if (additional[A_DROP_DENSEST_AS_NEEDED] || additional[A_COALESCE_DENSEST_AS_NEEDED] || additional[A_CLUSTER_DENSEST_AS_NEEDED] || additional[A_CALCULATE_FEATURE_DENSITY] || additional[A_INCREASE_GAMMA_AS_NEEDED] || sst->uses_gamma || cluster_distance != 0) {
if (additional[A_DROP_DENSEST_AS_NEEDED] || additional[A_COALESCE_DENSEST_AS_NEEDED] || additional[A_CLUSTER_DENSEST_AS_NEEDED] || additional[A_CALCULATE_FEATURE_DENSITY] || additional[A_DROP_SMALLEST_AS_NEEDED] || additional[A_COALESCE_SMALLEST_AS_NEEDED] || additional[A_INCREASE_GAMMA_AS_NEEDED] || sst->uses_gamma || cluster_distance != 0) {
sf.index = bbox_index;
} else {
sf.index = 0;