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
Roxygen: list(markdown = 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
Config/pak/sysreqs: libgdal-dev gdal-bin libgeos-dev libxml2-dev
        libzstd-dev
Repository: https://hypertidy.r-universe.dev
Date/Publication: 2026-02-10 04:17:20 UTC
RemoteUrl: https://github.com/hypertidy/tissot
RemoteRef: HEAD
RemoteSha: a21d5338fbb01aa1066ab6fecd17996c3569d3cb
NeedsCompilation: no
Packaged: 2026-06-07 07:01:47 UTC; root
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>