Support other projections

[chelm]

It would be nice to be able to pass in projection/EPSG code instead of assuming 4326. I can make a PR to add but the question would be on what pattern would you want to follow

bbox2extent(bbox, projCode, callback)

or

bbox2extent(bbox, options, callback)

The 2nd would support potential future optional values

[ungoldman]

3rd option:

bbox2extent(bbox || options, callback)

First param could be bbox array or options object w/ bbox key/value inside, e.g.

bbox2extent({
  bbox: [0, 0, 0, 0],
  crs: {} // crs object http://geojson.org/geojson-spec.html#coordinate-reference-system-objects
}, callback)

...but yeah that's just down to how we would want to implement it. I agree it would be nice to support more projections.

[ungoldman]

http://proj4js.org/ would probably do the trick

[chelm]

yes proj4 would be the thing for sure to use. At the very least we could add the ability to specify an srid code {srid: 102100}. This would assume the data being passed in would be in some other known proj though. Not a big deal right now.

[ungoldman]

@chelm do you know much about the difference between specifying CRS and SRID? I don't fully understand the differences and implications.