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maRci002 / proj4dart

Proj4dart is a Dart library to transform point coordinates from one coordinate system to another, including datum transformations.
MIT License
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Adding support for nadgrids #9

Closed maRci002 closed 2 years ago

maRci002 commented 2 years ago

Proj4js started to support nadgrids so it would be a nice feature to be implemented.

maRci002 commented 2 years ago

This will be implemented only if someone needs it.

For example you want to change +towgs84=... to +nadgrids=xxx.gsb

MaxiStefan commented 2 years ago

Hey, I read about the nadgrids from (https://github.com/proj4js/proj4js/pull/363 and the discussion in https://github.com/maRci002/proj4dart/issues/8). I have also encountered a few problems from converting from one CRS (that uses grids ) to another and I have come across a python implementation of proj that uses grid files such as .tif, .gtx and .gsb. Have you had the time to look into the dart support of these features?

maRci002 commented 2 years ago

12 added nadgrids support (.gsb files) which is based on proj4js/proj4js#363

.tif file type is a high quality image. .gtx file type isn't supported by proj4js and so doesn't this project, Pull requests are always welcome.