add link to coordinate operations by PROJ library in projectionintro (#…

…297)
OSGeo · Jan 25, 2020 · a252ed5 · a252ed5
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commit a252ed5
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diff --git a/doc/projectionintro.html b/doc/projectionintro.html
@@ -60,6 +60,7 @@ <h3>References</h3>
 <ul>
 <li> <a href="https://www.asprs.org/asprs-publications/grids-and-datums">ASPRS Grids and Datum</a>
 <li> <a href="http://geotiff.maptools.org/proj_list/">Projections Transform List</a> (PROJ)
+<li> <a href="https://proj.org/operations/index.html">Coordinate operations</a> by PROJ (projections, conversions, transformations, pipeline operator) 
 <li> <a href="http://www.mapref.org">MapRef - The Collection of Map Projections and Reference Systems for Europe</a>
 <li> <a href="http://crs.bkg.bund.de/crs-eu/">Information and Service System for European Coordinate Reference Systems - CRS</a>
 </ul>