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Add an option to drop the smallest features to make tiles small enough

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This commit is contained in:
Eric Fischer 2016-11-09 16:32:40 -08:00
parent 38ce49d2d4
commit 013e6512b4
10 changed files with 7524 additions and 5 deletions
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1
README.md
View File

@ -131,6 +131,7 @@ resolution is obtained than by using a smaller _maxzoom_ or _detail_.
* -am or --merge-polygons-as-needed: If a tile is too large, try to reduce it to under 500K by merging adjacent polygons together
* -as or --increase-spacing-as-needed: If a tile is too large, try to reduce it to under 500K by increasing the minimum spacing between features. The discovered spacing applies to the entire zoom level.
* -ad or --drop-fraction-as-needed: Dynamically drop some fraction of features from each zoom level to keep large tiles under the 500K size limit. (This is like `-pd` but applies to the entire zoom level, not to each tile.)
* -an or --drop-smallest-as-needed: Dynamically drop the smallest features (physically smallest: the shortest lines or the smallest polygons) from each zoom level to keep large tiles under the 500K size limit. This option will not work for point features.
### Doing less

28
geojson.cpp
View File

@ -350,6 +350,33 @@ int serialize_geometry(json_object *geometry, json_object *properties, json_obje
}
}
double extent = 0;
if (additional[A_DROP_SMALLEST_AS_NEEDED]) {
if (mb_geometry[t] == VT_POLYGON) {
for (size_t i = 0; i < dv.size(); i++) {
if (dv[i].op == VT_MOVETO) {
size_t j;
for (j = i + 1; j < dv.size(); j++) {
if (dv[j].op != VT_LINETO) {
break;
}
}
extent += get_area(dv, i, j);
i = j - 1;
}
}
} else if (mb_geometry[t] == VT_LINE) {
for (size_t i = 1; i < dv.size(); i++) {
if (dv[i].op == VT_LINETO) {
double xd = dv[i].x - dv[i - 1].x;
double yd = dv[i].y - dv[i - 1].y;
extent += sqrt(xd * xd + yd * yd);
}
}
}
}
if (tippecanoe_layername.size() != 0) {
if (layermap->count(tippecanoe_layername) == 0) {
layermap->insert(std::pair<std::string, layermap_entry>(tippecanoe_layername, layermap_entry(layermap->size())));
@ -380,6 +407,7 @@ int serialize_geometry(json_object *geometry, json_object *properties, json_obje
sf.geometry = dv;
sf.m = m;
sf.feature_minzoom = 0; // Will be filled in during index merging
sf.extent = (long long) extent;
// Calculate the center even if off the edge of the plane,
// and then mask to bring it back into the addressable area

1
main.cpp
View File

@ -1917,6 +1917,7 @@ int main(int argc, char **argv) {
{"merge-polygons-as-needed", no_argument, &additional[A_MERGE_POLYGONS_AS_NEEDED], 1},
{"increase-spacing-as-needed", no_argument, &additional[A_INCREASE_SPACING_AS_NEEDED], 1},
{"drop-fraction-as-needed", no_argument, &additional[A_DROP_FRACTION_AS_NEEDED], 1},
{"drop-smallest-as-needed", no_argument, &additional[A_DROP_SMALLEST_AS_NEEDED], 1},
{"no-line-simplification", no_argument, &prevent[P_SIMPLIFY], 1},
{"simplify-only-low-zooms", no_argument, &prevent[P_SIMPLIFY_LOW], 1},

2
man/tippecanoe.1
View File

@ -160,6 +160,8 @@ which may not be what you want.
\-as or \-\-increase\-spacing\-as\-needed: If a tile is too large, try to reduce it to under 500K by increasing the minimum spacing between features. The discovered spacing applies to the entire zoom level.
.IP \(bu 2
\-ad or \-\-drop\-fraction\-as\-needed: Dynamically drop some fraction of features from each zoom level to keep large tiles under the 500K size limit. (This is like \fB\fC\-pd\fR but applies to the entire zoom level, not to each tile.)
.IP \(bu 2
\-an or \-\-drop\-smallest\-as\-needed: Dynamically drop the smallest features (physically smallest: the shortest lines or the smallest polygons) from each zoom level to keep large tiles under the 500K size limit. This option will not work for point features.
.RE
.SS Doing less
.RS

1
options.hpp
View File

@ -11,6 +11,7 @@
#define A_MERGE_POLYGONS_AS_NEEDED ((int) 'm')
#define A_INCREASE_SPACING_AS_NEEDED ((int) 's')
#define A_DROP_FRACTION_AS_NEEDED ((int) 'd')
#define A_DROP_SMALLEST_AS_NEEDED ((int) 'n')
#define P_SIMPLIFY ((int) 's')
#define P_SIMPLIFY_LOW ((int) 'S')

1
serial.cpp
View File

@ -194,6 +194,7 @@ void serialize_feature(FILE *geomfile, serial_feature *sf, long long *geompos, c
write_geometry(sf->geometry, geompos, geomfile, fname, wx, wy);
serialize_byte(geomfile, VT_END, geompos, fname);
serialize_ulong_long(geomfile, sf->index, geompos, fname);
serialize_long_long(geomfile, sf->extent, geompos, fname);
serialize_int(geomfile, sf->m, geompos, fname);
serialize_long_long(geomfile, sf->metapos, geompos, fname);

1
serial.hpp
View File

@ -38,6 +38,7 @@ struct serial_feature {
drawvec geometry;
unsigned long long index;
long long extent;
size_t m;
std::vector<long long> keys;

6994
tests/ne_110m_admin_0_countries/out/-z5_-M5000_--drop-smallest-as-needed.json Normal file
View File

File diff suppressed because one or more lines are too long

444
tests/ne_110m_admin_1_states_provinces_lines/out/-z5_-M500_--drop-smallest-as-needed.json Normal file
View File

@ -0,0 +1,444 @@
{ "type": "FeatureCollection", "properties": {
"bounds": "-124.213808,29.689480,-70.645734,49.005640",
"center": "-95.625000,44.951199,5",
"description": "tests/ne_110m_admin_1_states_provinces_lines/out/-z5_-M500_--drop-smallest-as-needed.json.check.mbtiles",
"format": "pbf",
"json": "{\"vector_layers\": [ { \"id\": \"in\", \"description\": \"\", \"minzoom\": 0, \"maxzoom\": 5, \"fields\": {\"adm0_a3\": \"String\", \"adm0_name\": \"String\", \"featurecla\": \"String\", \"mapcolor13\": \"Number\", \"mapcolor9\": \"Number\", \"scalerank\": \"Number\"} } ] }",
"maxzoom": "5",
"minzoom": "0",
"name": "tests/ne_110m_admin_1_states_provinces_lines/out/-z5_-M500_--drop-smallest-as-needed.json.check.mbtiles",
"type": "overlay",
"version": "2"
}, "features": [
{ "type": "FeatureCollection", "properties": { "zoom": 0, "x": 0, "y": 0 }, "features": [
{ "type": "FeatureCollection", "properties": { "layer": "in", "version": 2, "extent": 4096 }, "features": [
{ "type": "Feature", "properties": { "scalerank": 2, "featurecla": "Admin-1 boundary", "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "LineString", "coordinates": [ [ -124.013672, 46.316584 ], [ -123.486328, 46.316584 ], [ -122.958984, 46.134170 ], [ -122.695312, 45.644768 ], [ -122.431641, 45.644768 ], [ -121.640625, 45.767523 ], [ -121.113281, 45.644768 ], [ -120.673828, 45.767523 ], [ -120.234375, 45.767523 ], [ -119.619141, 45.951150 ], [ -119.355469, 45.890008 ], [ -119.003906, 46.012224 ], [ -116.982422, 46.012224 ] ] } }
,
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{ "type": "Feature", "properties": { "scalerank": 2, "featurecla": "Admin-1 boundary", "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "LineString", "coordinates": [ [ -116.982422, 46.012224 ], [ -116.542969, 45.583290 ], [ -117.246094, 44.465151 ], [ -117.246094, 44.339565 ], [ -116.982422, 44.087585 ], [ -117.070312, 42.032974 ] ] } }
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] }
] }
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] }

56
tile.cpp
View File

@ -252,7 +252,7 @@ static int is_integer(const char *s, long long *v) {
return 1;
}
void rewrite(drawvec &geom, int z, int nextzoom, int maxzoom, long long *bbox, unsigned tx, unsigned ty, int buffer, int line_detail, int *within, long long *geompos, FILE **geomfile, const char *fname, signed char t, int layer, long long metastart, signed char feature_minzoom, int child_shards, int max_zoom_increment, long long seq, int tippecanoe_minzoom, int tippecanoe_maxzoom, int segment, unsigned *initial_x, unsigned *initial_y, int m, std::vector<long long> &metakeys, std::vector<long long> &metavals, bool has_id, unsigned long long id, unsigned long long index) {
void rewrite(drawvec &geom, int z, int nextzoom, int maxzoom, long long *bbox, unsigned tx, unsigned ty, int buffer, int line_detail, int *within, long long *geompos, FILE **geomfile, const char *fname, signed char t, int layer, long long metastart, signed char feature_minzoom, int child_shards, int max_zoom_increment, long long seq, int tippecanoe_minzoom, int tippecanoe_maxzoom, int segment, unsigned *initial_x, unsigned *initial_y, int m, std::vector<long long> &metakeys, std::vector<long long> &metavals, bool has_id, unsigned long long id, unsigned long long index, long long extent) {
if (geom.size() > 0 && nextzoom <= maxzoom) {
int xo, yo;
int span = 1 << (nextzoom - z);
@ -342,6 +342,7 @@ void rewrite(drawvec &geom, int z, int nextzoom, int maxzoom, long long *bbox, u
sf.metapos = metastart;
sf.geometry = geom2;
sf.index = index;
sf.extent = extent;
sf.m = m;
sf.feature_minzoom = feature_minzoom;
@ -1171,6 +1172,11 @@ unsigned long long choose_mingap(std::vector<unsigned long long> const &indices,
return top;
}
long long choose_minextent(std::vector<long long> &extents, double f) {
std::sort(extents.begin(), extents.end());
return extents[(extents.size() - 1) * (1 - f)];
}
struct write_tile_args {
struct task *tasks;
char *metabase;
@ -1209,14 +1215,17 @@ struct write_tile_args {
size_t passes;
unsigned long long mingap;
unsigned long long mingap_out;
long long minextent;
long long minextent_out;
double fraction;
double fraction_out;
};
long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *stringpool, int z, unsigned tx, unsigned ty, int detail, int min_detail, int basezoom, sqlite3 *outdb, double droprate, int buffer, const char *fname, FILE **geomfile, int minzoom, int maxzoom, double todo, volatile long long *along, long long alongminus, double gamma, int child_shards, long long *meta_off, long long *pool_off, unsigned *initial_x, unsigned *initial_y, volatile int *running, double simplification, std::vector<std::map<std::string, layermap_entry>> *layermaps, std::vector<std::vector<std::string>> *layer_unmaps, size_t pass, size_t passes, unsigned long long mingap, double fraction, write_tile_args *arg) {
long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *stringpool, int z, unsigned tx, unsigned ty, int detail, int min_detail, int basezoom, sqlite3 *outdb, double droprate, int buffer, const char *fname, FILE **geomfile, int minzoom, int maxzoom, double todo, volatile long long *along, long long alongminus, double gamma, int child_shards, long long *meta_off, long long *pool_off, unsigned *initial_x, unsigned *initial_y, volatile int *running, double simplification, std::vector<std::map<std::string, layermap_entry>> *layermaps, std::vector<std::vector<std::string>> *layer_unmaps, size_t pass, size_t passes, unsigned long long mingap, long long minextent, double fraction, write_tile_args *arg) {
int line_detail;
double merge_fraction = 1;
double mingap_fraction = 1;
double minextent_fraction = 1;
long long og = *geompos_in;
@ -1268,6 +1277,7 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
std::vector<struct partial> partials;
std::map<std::string, std::vector<coalesce>> layers;
std::vector<unsigned long long> indices;
std::vector<long long> extents;
int within[child_shards];
long long geompos[child_shards];
@ -1314,9 +1324,11 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
long long bbox[4];
unsigned long long index;
long long extent;
drawvec geom = decode_geometry(geoms, geompos_in, z, tx, ty, line_detail, bbox, initial_x[segment], initial_y[segment]);
deserialize_ulong_long_io(geoms, &index, geompos_in);
deserialize_long_long_io(geoms, &extent, geompos_in);
long long metastart;
int m;
@ -1435,7 +1447,7 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
}
if (first_time && pass == 1) { /* only write out the next zoom once, even if we retry */
rewrite(geom, z, nextzoom, maxzoom, bbox, tx, ty, buffer, line_detail, within, geompos, geomfile, fname, t, layer, metastart, feature_minzoom, child_shards, max_zoom_increment, original_seq, tippecanoe_minzoom, tippecanoe_maxzoom, segment, initial_x, initial_y, m, metakeys, metavals, has_id, id, index);
rewrite(geom, z, nextzoom, maxzoom, bbox, tx, ty, buffer, line_detail, within, geompos, geomfile, fname, t, layer, metastart, feature_minzoom, child_shards, max_zoom_increment, original_seq, tippecanoe_minzoom, tippecanoe_maxzoom, segment, initial_x, initial_y, m, metakeys, metavals, has_id, id, index, extent);
}
if (z < minzoom) {
@ -1465,6 +1477,12 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
continue;
}
}
if (additional[A_DROP_SMALLEST_AS_NEEDED]) {
extents.push_back(extent);
if (extent <= minextent) {
continue;
}
}
if (additional[A_CALCULATE_FEATURE_DENSITY]) {
// Gamma is always 1 for this calculation so there is a reasonable
@ -1776,6 +1794,17 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
}
line_detail++;
continue;
} else if (additional[A_DROP_SMALLEST_AS_NEEDED]) {
minextent_fraction = minextent_fraction * 200000.0 / totalsize * 0.90;
minextent = choose_minextent(extents, minextent_fraction);
if (minextent > arg->minextent_out) {
arg->minextent_out = minextent;
}
if (!quiet) {
fprintf(stderr, "Going to try keeping the biggest %0.2f%% of the features to make it fit\n", minextent_fraction * 100.0);
}
line_detail++;
continue;
} else if (prevent[P_DYNAMIC_DROP] || additional[A_DROP_FRACTION_AS_NEEDED]) {
fraction = fraction * 200000 / totalsize * 0.95;
if (!quiet) {
@ -1830,6 +1859,17 @@ long long write_tile(FILE *geoms, long long *geompos_in, char *metabase, char *s
fprintf(stderr, "Going to try keeping the sparsest %0.2f%% of the features to make it fit\n", mingap_fraction * 100.0);
}
line_detail++;
} else if (additional[A_DROP_SMALLEST_AS_NEEDED]) {
minextent_fraction = minextent_fraction * max_tile_size / compressed.size() * 0.90;
minextent = choose_minextent(extents, minextent_fraction);
if (minextent > arg->minextent_out) {
arg->minextent_out = minextent;
}
if (!quiet) {
fprintf(stderr, "Going to try keeping the biggest %0.2f%% of the features to make it fit\n", minextent_fraction * 100.0);
}
line_detail++;
continue;
} else if (prevent[P_DYNAMIC_DROP] || additional[A_DROP_FRACTION_AS_NEEDED]) {
// The 95% is a guess to avoid too many retries
// and probably actually varies based on how much duplicated metadata there is
@ -1912,7 +1952,7 @@ void *run_thread(void *vargs) {
// fprintf(stderr, "%d/%u/%u\n", z, x, y);
long long len = write_tile(geom, &geompos, arg->metabase, arg->stringpool, z, x, y, z == arg->maxzoom ? arg->full_detail : arg->low_detail, arg->min_detail, arg->basezoom, arg->outdb, arg->droprate, arg->buffer, arg->fname, arg->geomfile, arg->minzoom, arg->maxzoom, arg->todo, arg->along, geompos, arg->gamma, arg->child_shards, arg->meta_off, arg->pool_off, arg->initial_x, arg->initial_y, arg->running, arg->simplification, arg->layermaps, arg->layer_unmaps, arg->pass, arg->passes, arg->mingap, arg->fraction, arg);
long long len = write_tile(geom, &geompos, arg->metabase, arg->stringpool, z, x, y, z == arg->maxzoom ? arg->full_detail : arg->low_detail, arg->min_detail, arg->basezoom, arg->outdb, arg->droprate, arg->buffer, arg->fname, arg->geomfile, arg->minzoom, arg->maxzoom, arg->todo, arg->along, geompos, arg->gamma, arg->child_shards, arg->meta_off, arg->pool_off, arg->initial_x, arg->initial_y, arg->running, arg->simplification, arg->layermaps, arg->layer_unmaps, arg->pass, arg->passes, arg->mingap, arg->minextent, arg->fraction, arg);
if (len < 0) {
int *err = &arg->err;
@ -2091,12 +2131,13 @@ int traverse_zooms(int *geomfd, off_t *geom_size, char *metabase, char *stringpo
int err = INT_MAX;
size_t start = 1;
if (additional[A_INCREASE_GAMMA_AS_NEEDED] || additional[A_INCREASE_SPACING_AS_NEEDED] || additional[A_DROP_FRACTION_AS_NEEDED]) {
if (additional[A_INCREASE_GAMMA_AS_NEEDED] || additional[A_INCREASE_SPACING_AS_NEEDED] || additional[A_DROP_FRACTION_AS_NEEDED] || additional[A_DROP_SMALLEST_AS_NEEDED]) {
start = 0;
}
double zoom_gamma = gamma;
unsigned long long zoom_mingap = 0;
long long zoom_minextent = 0;
double zoom_fraction = 1;
for (size_t pass = start; pass < 2; pass++) {
@ -2121,6 +2162,8 @@ int traverse_zooms(int *geomfd, off_t *geom_size, char *metabase, char *stringpo
args[thread].gamma_out = zoom_gamma;
args[thread].mingap = zoom_mingap;
args[thread].mingap_out = zoom_mingap;
args[thread].minextent = zoom_minextent;
args[thread].minextent_out = zoom_minextent;
args[thread].fraction = zoom_fraction;
args[thread].fraction_out = zoom_fraction;
args[thread].child_shards = TEMP_FILES / threads;
@ -2170,6 +2213,9 @@ int traverse_zooms(int *geomfd, off_t *geom_size, char *metabase, char *stringpo
if (args[thread].mingap_out > zoom_mingap) {
zoom_mingap = args[thread].mingap_out;
}
if (args[thread].minextent_out > zoom_minextent) {
zoom_minextent = args[thread].minextent_out;
}
if (args[thread].fraction_out < zoom_fraction) {
zoom_fraction = args[thread].fraction_out;
}