d3.js - shp2json produces GeoJSON with bounding and coordinates not in (-180,180) range -

i doing @mbostock's tutorial on command line cartography 1. here i've done:

1) download zip file

wget https://www.arb.ca.gov/ei/gislib/gislib.htm/ca_air_basins.zip (from california air resources board site)

2) manually unzip clicking .zip file (unzip command did not work because downloaded file didn't have 'end-of-central-directory signature')

2) convert shapefile geojson shp2json caairbasin.shp -o ca.json

3) make geojson projection using california albers (specified in caairbasin.prj file):

geoproject 'd3.geoconicequalarea().parallels([34, 40.5]).rotate([120, 0]).fitsize([960, 960], d)' < ca.json > ca-albers.json

result: ca-albers.json (223m) bigger ca.json (6.3m). in census tract shapefile used in tutorial, file size increases 10 14 m.

update: seems problem shp2json step instead of geoproject step. looking @ caairbasin.shp.xml, there 2 sets of bounding,bounding , lbounding. in case,lbounding , coordinate values in 100,000s range used opposed (-180, 180) in tutorial, making projection fail.

what next step - there alternative shp2json work case? or how can translate bounding/coordinates appropriate (-180,180) ones?

thank you.

your shapefile projected. passing through d3.geoconicequalarea, projecting twice; d3.geoconicequalarea expects wgs84 (longitude , latitude in degrees) input, you’re giving projected coordinates.

you can tell shapefile projected looking @ prj file, or looking @ coordinates of geometry generated shp2json: first point [-298228.39936644124, 437516.87775637675], outside expected range of [±180°, ±90°] longitude , latitude.

rather re-projecting geometry new projection, easiest thing use projection it’s in. need translate , scale fit desired display size of 960×960. can use d3.geoidentity this.

geoproject 'd3.geoidentity().reflecty(true).fitsize([960, 960], d)' < ca.json > ca-albers.json 

setting identity.reflecty fix vertical orientation of geometry: gis convention +y points up, canvas , svg convention +y points down.