{
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  "Package": "tissot",
  "Title": "Tissot Indicatrix for Map Projection Distortion",
  "Version": "0.2.0",
  "Authors@R": "c(\nperson(\"Michael\", \"Sumner\", email = \"mdsumner@gmail.com\", role = c(\"aut\", \"cre\"),\ncomment = c(ORCID = \"0000-0002-2471-7511\")),\nperson(\"Bill\", \"Huber\", role = \"aut\",\ncomment = \"original algorithm and calculations\")\n)",
  "Description": "Compute and visualize the 'Tissot Indicatrix' for map\nprojections. The indicatrix characterizes projection distortion\nby computing scale factors, angular deformation, areal\ndistortion, and convergence at arbitrary points. Based on the\ncalculations shared by Bill Huber on\n<https://gis.stackexchange.com/a/5075/482>. Uses 'GDAL' for\ncoordinate transformation. Developed using the method published\nin Snyder, JP (1987) <doi:10.3133/pp1395>.",
  "License": "MIT + file LICENSE",
  "Encoding": "UTF-8",
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  "Roxygen": "list(markdown = TRUE)",
  "RoxygenNote": "7.3.3",
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  "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\nlibzstd-dev",
  "Repository": "https://hypertidy.r-universe.dev",
  "Date/Publication": "2026-02-10 04:17:20 UTC",
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  "NeedsCompilation": "no",
  "Packaged": {
    "Date": "2026-05-08 08:51:54 UTC",
    "User": "root"
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  "Author": "Michael Sumner [aut, cre] (ORCID:\n<https://orcid.org/0000-0002-2471-7511>),\nBill Huber [aut] (original algorithm and calculations)",
  "Maintainer": "Michael Sumner <mdsumner@gmail.com>",
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  "_selfowned": true,
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      "n": 6
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  "_devurl": "https://github.com/hypertidy/tissot",
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  "_assets": [
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    "extra/citation.html",
    "extra/citation.json",
    "extra/citation.txt",
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  "_realowner": "hypertidy",
  "_cranurl": true,
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    "indicatrix",
    "ti_ellipse",
    "tissot",
    "tissot_abline",
    "tissot_get_proj",
    "tissot_map",
    "tissot_set_proj",
    "tissot_unproject"
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  "_datasets": [
    {
      "name": "world",
      "title": "World coastline",
      "object": "world",
      "class": [
        "matrix",
        "array"
      ],
      "fields": [
        "x",
        "y"
      ],
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    }
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  "_help": [
    {
      "page": "sub-.indicatrix_list",
      "title": "Subset an indicatrix_list",
      "topics": [
        "[.indicatrix_list"
      ]
    },
    {
      "page": "indicatrix",
      "title": "Compute Tissot indicatrix ellipse geometry",
      "topics": [
        "indicatrix"
      ]
    },
    {
      "page": "plot.indicatrix",
      "title": "Plot an indicatrix",
      "topics": [
        "plot.indicatrix"
      ]
    },
    {
      "page": "plot.indicatrix_list",
      "title": "Plot a list of indicatrixes",
      "topics": [
        "plot.indicatrix_list"
      ]
    },
    {
      "page": "ti_ellipse",
      "title": "Generate ellipse coordinates for an indicatrix",
      "topics": [
        "ti_ellipse"
      ]
    },
    {
      "page": "tissot",
      "title": "Compute Tissot indicatrix properties",
      "topics": [
        "tissot"
      ]
    },
    {
      "page": "tissot_get_proj",
      "title": "Get or set the current plot projection",
      "topics": [
        "tissot_get_proj",
        "tissot_set_proj"
      ]
    },
    {
      "page": "tissot_map",
      "title": "Plot world coastline on a projected map",
      "topics": [
        "tissot_abline",
        "tissot_map"
      ]
    },
    {
      "page": "tissot_unproject",
      "title": "Unproject coordinates to geographic (lon/lat) CRS",
      "topics": [
        "tissot_unproject"
      ]
    },
    {
      "page": "world",
      "title": "World coastline",
      "topics": [
        "world"
      ]
    }
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