Comments (3)
The metric varies depending on the coordinate system being used. For Cartesian coordinate systems, it is simple Euclidean distance in whatever units you are using. The spherical geographic factory measures distances in meters. If you use a geographic factory with an underlying projection, the "distance" is measured in that projection's units.
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What about if you want to convert to miles, nautical miles, ft, inches, or boat lengths...
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It depends on what coordinate system you are in. For example, if you're in a standard Mercator projection, the units are generally in meters, but you have to scale up as you increase in latitude. You can look up the formula for your particular projection on a variety of websites. RGeo doesn't try to do this for you because there are so many cases---it's different for every single coordinate system, and that only accounts for the known "standard" coordinate systems (of which there are hundreds).
If you need help with a particular use case, ask on the rgeo-users google group. Someone there (probably me) can point you in the right direction.
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Related Issues (20)
- Set Precision for Coordinates HOT 4
- Create Documentation for Adding GEOS Functions to CAPI and FFI Implementations
- C Styleguide
- uby HOT 1
- CAPI stress test under low memory
- Polygon centroid has different SRID
- Concurrency problems with single app-wide factory? HOT 1
- rgeo 3 geom freeze behaviour HOT 3
- Expand classes in `CoordSys` module HOT 1
- Proj Rework: Clean up Core Gem
- Geos not supported HOT 3
- Tackle rubocop todo list HOT 4
- Geos not supported HOT 7
- `test_invalid_polygon_duplicate_rings` test is failing HOT 3
- Add Supported Geos Versions to CI
- `make_valid` throwing errors HOT 1
- RGeo::Error::InvalidGeometry: Unable to cast the geometry to the GEOS Factory HOT 3
- With geos 3.12, the CAPI factory enables Z geometries HOT 6
- RGeo::Geos.supported? false with GEOS 3.12 on Amazon Linux 2023 HOT 21
- `ENVELOPE` method on linestring does not return `POLYGON` HOT 5
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