[Proj] Transformation pipelines - your opinion?
howard at hobu.co
Sun Jun 5 17:56:43 EST 2016
> On Jun 4, 2016, at 10:46 PM, Thomas Knudsen <knudsen.thomas at gmail.com> wrote:
> I have recently opened a new pull request over at
> https://github.com/OSGeo/proj.4/pull/388 ...
> It introduces projection pipelines (i.e. multi-step transformations),
> and, at the end-user facing side of things, a new 3D transformation
> program called “tran”, which directly supports transformation
> While the pull request expands the capabilities of proj.4
> dramatically, the code is not very intrusive: Technically, the
> pipeline driver is just a new projection, and hence a transformation
> pipeline is introduced with the incantation “+proj=pipeline”.
> I agree that at first, this may seem a bit odd, so I hope to initiate
> a discussion here about e.g. the syntax, and aboult potentially useful
> pipeline primitives: The code is still in its infancy, so a lot will
> happen before it is ready for merging into the proj.4 master branch
> (although I hope it can be done in time for version 4.10)
> You can contribute to the discussion here and/or over at the github
> page already mentioned. Also, you can read more about syntactic
> details at my proj.4 page http://thomasknudsen.net/proj4.html, where
> you can also find instructions for downloading a recent Windows build
> of the “tran” tool.
This looks like a really great addition! I've been watching the pull request with excitement that this approach will provide more avenues for these kinds of challenging problems. As a point cloud and LiDAR person, these capabilities will be very useful, and the momentum you and Kristian have been building to improve Proj.4 maintenance and feature set is greatly appreciated.
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