tissot: Tissot Indicatrix for Map Projection Distortion
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>.
| Version: | 0.2.0 |
| Depends: | R (≥ 3.6.0) |
| Imports: | tibble, gdalraster, graphics, grDevices |
| Suggests: | testthat (≥ 3.0.0), knitr, rmarkdown, spelling |
| Published: | 2026-02-12 |
| DOI: | 10.32614/CRAN.package.tissot |
| Author: | Michael Sumner 
[aut, cre],
Bill Huber [aut] (original algorithm and calculations) |
| Maintainer: | Michael Sumner <mdsumner at gmail.com> |
| BugReports: | https://github.com/hypertidy/tissot/issues |
| License: | MIT + file LICENSE |
| URL: | https://github.com/hypertidy/tissot |
| NeedsCompilation: | no |
| Language: | en-US |
| Materials: | README, NEWS |
| CRAN checks: | tissot results |
Documentation:
| Reference manual: | tissot.html , tissot.pdf |
Downloads:
| Package source: | tissot_0.2.0.tar.gz |
| Windows binaries: | r-devel: tissot_0.2.0.zip, r-release: tissot_0.2.0.zip, r-oldrel: tissot_0.2.0.zip |
| macOS binaries: | r-release (arm64): tissot_0.2.0.tgz, r-oldrel (arm64): tissot_0.2.0.tgz, r-release (x86_64): tissot_0.2.0.tgz, r-oldrel (x86_64): tissot_0.2.0.tgz |
Linking:
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