Map Projections
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Map center —
h — scale along meridian
k — scale along parallel
Area scale — h·k·sin θ′
ω — max angle distortion
Where GIS uses it
Common CRS codes
The list follows ArcGIS Pro's supported map projections, leaving out a few the browser projection libraries here don't provide (Adams Square II, Aspect-Adaptive Cylindrical, Compact Miller, Tobler Cylindrical I and II, Wagner V, Winkel II, New Zealand Map Grid, IGAC Plano Cartesiano and Local). Coastlines from Natural Earth 1:110m (public domain) via world-atlas. Projection math from d3-geo, d3-geo-projection and d3-geo-polygon on a spherical Earth. Scale factors h, k, area and ω are computed numerically at each point on a unit sphere, so 1.00 means true scale. CRS codes are typical EPSG/ESRI examples; real datasets also fix a datum and parameters.