[PROJ] How to get started with CRS in WKT?

[Lesparre, Jochem]

Dear PROJ maillist,

At a the national mapping agency of the Netherlands we are responsible for defining the CRS of European Netherlands and the 3 islands of the Caribbean Netherlands. We are working on standardising the official transformations so these can be added to EPSG and the transformations become available in PROJ and other software. To perform transformations ourself, we create cct pipelines. I love the power cct pipelines. Unfortunately, other applications often expect a WKT string. For the transformations we added to EPSG, I can copy-paste the WKT from epsg.org. To experiment with a custom CRS, I sometimes try to create my own WKT strings. However, these attempts are not very successful for two reasons.

Firstly, it takes an annoying lot of effort get the code indented to make it readable (the indent plugin in notepad++ only works after using search and replace to add line breaks) and to keep the brackets right for valid WKT while editing, before I can even start to experiment with the rest of the syntax. Can you recommend a way to make creating WKT easier?

Secondly, I am quite confused by the different WKT examples that I find. Some seem to use different ways to define transformations in WKT (e.g. ABRIDGEDTRANSFORMATION, GEOGTRAN, COORDINATEOPERATION). Can you recommend a way to get started with understanding WKT? As a geodesist, I am familiar with transformation methods, so I only need information on how to translate between this theory and WKT.

Kind regards, Jochem


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