Package: tissot
Title: Tissot Indicatrix for Map Projection Distortion
Version: 0.2.0
Authors@R: c(
    person("Michael", "Sumner", email = "mdsumner@gmail.com", role = c("aut", "cre"), 
           comment = c(ORCID = "0000-0002-2471-7511")),
    person("Bill", "Huber", role = "aut", 
           comment = "original algorithm and calculations")
  )
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>. 
License: MIT + file LICENSE
Encoding: UTF-8
LazyData: true
RoxygenNote: 7.3.3
Depends: R (>= 3.6.0)
Imports: tibble, gdalraster, graphics, grDevices
Suggests: testthat (>= 3.0.0), knitr, rmarkdown, spelling
Config/testthat/edition: 3
URL: https://github.com/hypertidy/tissot
BugReports: https://github.com/hypertidy/tissot/issues
Language: en-US
NeedsCompilation: no
Packaged: 2026-02-10 04:22:37 UTC; mdsumner
Author: Michael Sumner [aut, cre] (ORCID:
    <https://orcid.org/0000-0002-2471-7511>),
  Bill Huber [aut] (original algorithm and calculations)
Maintainer: Michael Sumner <mdsumner@gmail.com>
Repository: CRAN
Date/Publication: 2026-02-12 08:10:02 UTC
Built: R 4.6.0; ; 2026-04-28 22:03:56 UTC; unix
