bigcurve: Adaptive Densification of Lines for Map Projections

Densify lines adaptively, as required by the curvature a map projection imposes on them. Edges are read as great circle arcs, and vertices are inserted along them only where the projected curve deviates from a straight chord by more than a tolerance measured on the map, following the adaptive resampling scheme of 'd3-geo' https://github.com/d3/d3-geo. Projections are computed with the 'PROJ' library, so any coordinate reference system it supports can be a target. Inputs can be coordinate matrices, segment meshes or vertex pool topology from 'wkpool', and edges shared by neighbouring polygons receive identical new vertices.

See also

Useful links:

• https://github.com/hypertidy/bigcurve

• Report bugs at https://github.com/hypertidy/bigcurve/issues

Author

Maintainer: Michael D. Sumner mdsumner@gmail.com [copyright holder]

Other contributors:

• Simon Wotherspoon (wrote SGAT::trackMdpts, the ancestor of the spherical midpoint used here) [contributor]

• Mike Bostock (author of the 'd3-geo' adaptive resampling method ported here; see inst/COPYRIGHTS) [contributor, copyright holder]