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Add documentation. Be lenient about zooms as numbers vs strings.

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This commit is contained in:
Eric Fischer 2015-10-07 13:54:31 -07:00
parent c0480673c5
commit 6767aa7a5c
3 changed files with 52 additions and 0 deletions
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23
README.md
View File

@ -110,6 +110,29 @@ $ tippecanoe -o alameda.mbtiles -l alameda -n "Alameda County from TIGER" -z13 t
$ cat tiger/tl_2014_*_roads.json | tippecanoe -o tiger.mbtiles -l roads -n "All TIGER roads, one zoom" -z12 -Z12 -d14 -x LINEARID -x RTTYP
```
GeoJSON extension
-----------------
Tippecanoe defines a GeoJSON extension that you can use to specify the minimum and/or maximum zoom level
at which an individual feature will be included in the vector tile dataset being produced.
If you have a feature like this:
```
{
"type" : "Feature",
"tippecanoe" : { "maxzoom" : 9, "minzoom" : 4 },
"properties" : { "FULLNAME" : "N Vasco Rd", },
"geometry" : {
"type" : "LineString",
"coordinates" : [ ... ]
}
}
```
with a `tippecanoe` object specifiying a `maxzoom` of 9 and a `minzoom` of 4, the feature
will only appear in the vector tiles for zoom levels 4 through 9. Note that the `tippecanoe`
object belongs to the Feature, not to its `properties`.
Point styling
-------------

6
geojson.c
View File

@ -451,11 +451,17 @@ int serialize_geometry(json_object *geometry, json_object *properties, const cha
if (min != NULL && min->type == JSON_NUMBER) {
tippecanoe_minzoom = min->number;
}
if (min != NULL && min->type == JSON_STRING) {
tippecanoe_minzoom = atoi(min->string);
}
json_object *max = json_hash_get(tippecanoe, "maxzoom");
if (max != NULL && max->type == JSON_NUMBER) {
tippecanoe_maxzoom = max->number;
}
if (max != NULL && max->type == JSON_STRING) {
tippecanoe_maxzoom = atoi(max->string);
}
}
unsigned bbox[] = {UINT_MAX, UINT_MAX, 0, 0};

23
man/tippecanoe.1
View File

@ -137,6 +137,29 @@ $ tippecanoe \-o alameda.mbtiles \-l alameda \-n "Alameda County from TIGER" \-z
$ cat tiger/tl_2014_*_roads.json | tippecanoe \-o tiger.mbtiles \-l roads \-n "All TIGER roads, one zoom" \-z12 \-Z12 \-d14 \-x LINEARID \-x RTTYP
.fi
.RE
.SH GeoJSON extension
.PP
Tippecanoe defines a GeoJSON extension that you can use to specify the minimum and/or maximum zoom level
at which an individual feature will be included in the vector tile dataset being produced.
If you have a feature like this:
.PP
.RS
.nf
{
"type" : "Feature",
"tippecanoe" : { "maxzoom" : 9, "minzoom" : 4 },
"properties" : { "FULLNAME" : "N Vasco Rd", },
"geometry" : {
"type" : "LineString",
"coordinates" : [ ... ]
}
}
.fi
.RE
.PP
with a \fB\fCtippecanoe\fR object specifiying a \fB\fCmaxzoom\fR of 9 and a \fB\fCminzoom\fR of 4, the feature
will only appear in the vector tiles for zoom levels 4 through 9. Note that the \fB\fCtippecanoe\fR
object belongs to the Feature, not to its \fB\fCproperties\fR\&.
.SH Point styling
.PP
To provide a consistent density gradient as you zoom, the Mapbox Studio style needs to be