spherical mercator assumption

tilezen / mapbox-vector-tile

Python package for encoding & decoding Mapbox Vector Tiles

MIT License

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Closed pnorman closed 8 years ago

pnorman commented 8 years ago

README.md states

Per the specification, geometries are expected to be in spherical mercator projection before this transformations

The specification is actually projection-agnostic, working only in units within the extent. It's TMS numbering where the projection comes in.

zerebubuth commented 8 years ago

I've updated that section of the README in #49 - does that look better now?

pnorman commented 8 years ago

:+1:

It also makes some other concepts clearer which I had to step through a couple times to understand.