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Merge pull request #83 from mapbox/tile-join-docs

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Simplify tile-join example
This commit is contained in:
Eric Fischer 2015-09-17 12:52:37 -07:00
commit a70a8734e3
1 changed files with 5 additions and 7 deletions
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12
README.md
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@ -223,15 +223,13 @@ If a tile is too big, it is just left out of the new tileset.
Example
-------
Imagine you have a tileset of census blocks, with some slightly ridiculous mangling to give each of them a single field to identify their state/county/tract/block combination:
Imagine you have a tileset of census blocks:
```sh
curl -O http://www2.census.gov/geo/tiger/TIGER2010/TABBLOCK/2010/tl_2010_06001_tabblock10.zip
unzip tl_2010_06001_tabblock10.zip
ogr2ogr -f GeoJSON tl_2010_06001_tabblock10.json tl_2010_06001_tabblock10.shp
cat tl_2010_06001_tabblock10.json |
sed 's/"STATEFP10": "\([^"]*\)", "COUNTYFP10": "\([^"]*\)", "TRACTCE10": "\([^"]*\)", "BLOCKCE10": "\([^"]*\)"/"statecountytractblock": "\1\2\3\4", &/' |
./tippecanoe -o tl_2010_06001_tabblock10.mbtiles
./tippecanoe -o tl_2010_06001_tabblock10.mbtiles tl_2010_06001_tabblock10.json
```
and a CSV of their populations:
@ -240,7 +238,7 @@ and a CSV of their populations:
curl -O http://www2.census.gov/census_2010/01-Redistricting_File--PL_94-171/California/ca2010.pl.zip
unzip -p ca2010.pl.zip cageo2010.pl |
awk 'BEGIN {
print "statecountytractblock,population"
print "GEOID10,population"
}
(substr($0, 9, 3) == "750") {
print "\"" substr($0, 28, 2) substr($0, 30, 3) substr($0, 55, 6) substr($0, 62, 4) "\"," (0 + substr($0, 328, 9))
@ -250,7 +248,7 @@ awk 'BEGIN {
which looks like this:
```
statecountytractblock,population
GEOID10,population
"060014277003018",0
"060014283014046",0
"060014284001020",0
@ -265,5 +263,5 @@ statecountytractblock,population
Then you can join those populations to the geometries and discard the no-longer-needed ID field:
```sh
./tile-join -o population.mbtiles -x statecountytractblock -c population.csv tl_2010_06001_tabblock10.mbtiles
./tile-join -o population.mbtiles -x GEOID10 -c population.csv tl_2010_06001_tabblock10.mbtiles
```