geoscale

[mbostock]

It’d be nice to have a binary for taking projected, planar GeoJSON as input and then transforming the coordinates to fit the specified bounding box. It should also support --invert for flipping the y-dimension, as Proj4 and other projection systems typically use the other y direction than Canvas and SVG.

https://github.com/topojson/topojson/blob/v1.6.27/lib/topojson/scale.js

[mbostock]

I don’t think this needs to be a separate binary, since geoproject lets you specify the projection expression, meaning you can use d3.geoTransform to flip, and d3.geoIdentity to scale-to-fit.

https://bl.ocks.org/mbostock/5663666

[mbostock]

Yep…

shp2json nad83.shp | \
  geoproject 'd3.geoTransform({point: function(x, y) { this.stream.point(x, -y); }})' | \
  geoproject 'd3.geoIdentity().fitSize([960, 500], d)' | \
  geo2svg > test.svg

It’d be nice to have d3.geoInvertY() as shorthand for the first, though.