Hi there! I tested some more and it seems that this is not only a problem for WMS layers, but for Raster layers as well. Here is an example GeoTiff: https://github.com/mapserver/mapserver/files/1047153/test.zip
I can warp this to HEALPix using GDAL on the command line: gdalwarp -t_srs '+proj=healpix +a=1 +b=1 +wktext' -te -0.5 0.6 0.5 1 test.tiff healpix.tiff The result looks as supposed (see example in the original issue: https://github.com/mapserver/mapserver/issues/5437). However, if I let mapserver do the reprojection, the result is distorted (e.g. Libya is missing on the map). This is my layer (except for some metadata): LAYER name "test" status ON type RASTER data "test.tiff" PROJECTION AUTO END END This is in my epsg file: <900916> +proj=healpix +a=1 +b=1 <> This is the relevant part of the WMS request: ...&LAYERS=test&WIDTH=600&HEIGHT=300&SRS=EPSG:900916&BBOX=-0.5,0.6,0.5,1 The example test.tiff I linked above covers exactly the area I am requesting to be reprojected to HEALPix. As soon as this input tiff is larger, the reprojection works as supposed. I guess that this is the reason why I observed the issue with CONNECTIONTYPE WMS first: Here the input data is usually exactly as large as required by the reprojection! Where do I have to go bug hunting? Is it a configuration issue? Is it a reprojection issue specific to HEALPix? Thank you for your support! Simon Von: mapserver-users [mailto:[email protected]] Im Auftrag von [email protected] Gesendet: Dienstag, 30. Mai 2017 13:17 An: [email protected] Betreff: [mapserver-users] Reprojection error for CONNECTIONTYPE WMS Hi there! I am happily using mapserver to reproject raster data to the HEALPix projection from proj.4<http://proj4.org/projections/healpix.html>. This works pretty well for local raster sources, however I get severe reprojection problems when using an external WMS as source for my layer. I reported this issue on Github (https://github.com/mapserver/mapserver/issues/5437) but was told to ask here for assistance. Instead of copy-pasting the text from the Github issue to this mail, I kindly ask you to refer to this Github issue for further information; there I also included several images illustrating the problem. I am looking forward to get any feedback or input that helps me solving this issue! Thank you very much! Simon -------------------------- Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) German Aerospace Center Simulation and Software Technology | Software for Space Systems and Interactive Visualization | Lilienthalplatz 7 | 38108 Braunschweig | Germany Simon Schneegans, M. Sc. Telephone +49 531 295-2333 | Telefax +49 531 295-12100 | [email protected]<mailto:[email protected]> DLR.de<http://www.dlr.de/>
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