tissot

Tissot Indicatrix for Map Projection Distortion

v0.2.0 · Feb 12, 2026 · MIT + file LICENSE

Description

Compute and visualize the 'Tissot Indicatrix' for map projections. The indicatrix characterizes projection distortion by computing scale factors, angular deformation, areal distortion, and convergence at arbitrary points. Based on the calculations shared by Bill Huber on <https://gis.stackexchange.com/a/5075/482>. Uses 'GDAL' for coordinate transformation. Developed using the method published in Snyder, JP (1987) <doi:10.3133/pp1395>.

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13 OK

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Flavor	Status	Time
r-devel-linux-x86_64-debian-clang	OK	102.2s
r-devel-linux-x86_64-debian-gcc	OK	70.6s
r-devel-linux-x86_64-fedora-clang	OK	169.2s
r-devel-linux-x86_64-fedora-gcc	OK	166.2s
r-devel-windows-x86_64	OK	102s
r-oldrel-macos-arm64	OK	25s
r-oldrel-macos-x86_64	OK	259s
r-oldrel-windows-x86_64	OK	130s
r-patched-linux-x86_64	OK	100.2s
r-release-linux-x86_64	OK
r-release-macos-arm64	OK	25s
r-release-macos-x86_64	OK	88s
r-release-windows-x86_64	OK	100s

Check History

OK 13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE Jun 9, 2026

WARNING 12 OK · 0 NOTE · 1 WARNING · 0 ERROR · 0 FAILURE Jun 8, 2026

WARNING r-devel-linux-x86_64-debian-gcc

Rd files

cannot open the connection
cannot open the connection
cannot open the connection
problems found in ‘tissot_map.Rd’, ‘tissot_unproject.Rd’, ‘world.Rd’

OK 14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE Mar 10, 2026

Dependency Network

Version History

1 tracked

new 0.2.0 Mar 10, 2026

R Observatory began tracking this package on Mar 10, 2026; it first appeared on CRAN Feb 12, 2026. Releases before tracking aren’t shown.