Hi Alistair, The Mapfile and requests look fine to me, so this is likely an oversight in the implementation. It would be good to get this logged as an issue, ideally with a recreatable test case at https://github.com/MapServer/MapServer/issues.
Seth -- web:https://geographika.net & https://mapserverstudio.net mastodon: @[email protected] On Mon, Oct 6, 2025, at 12:16 PM, Alistair Everett wrote: > Hi Seth, > > Thanks for your reply, we're just reprojecting the data. I'll take a closer > look at the test case too, since it seems like that should be reprojecting > from stereographic to geographic. I should also be able to pull together some > test data in the next few days too, I can open an issue with it when I've put > it together. > > Here are a couple of example requests: > > One in EPSG:4326 > localhost:8000/wms?REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&FORMAT=image%2Fpng&STYLES=wind_barb&TRANSPARENT=TRUE&TIME=2025-10-06T07%3A00%3A00Z&DIM_PRESSURE=50.0&DIM_REFERENCE_TIME=2025-10-06T03%3A00%3A00Z&LAYERS=wind_pl_vector_meps_det_vdiv_2_5km_calculations&WIDTH=1304&HEIGHT=1504&CRS=EPSG%3A3857&BBOX=-2460529.2703191666%2C4596419.518351211%2C6809846.057963322%2C15288631.55342549 > > https://pasteboard.co/jI1eMKaj3PT1.png > > This is one in EPSG:3411: > localhost:8000/wms?REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&FORMAT=image%2Fpng&STYLES=wind_barb&TRANSPARENT=TRUE&TIME=2025-10-06T16%3A00%3A00Z&DIM_PRESSURE=50.0&DIM_REFERENCE_TIME=2025-10-06T03%3A00%3A00Z&LAYERS=wind_pl_vector_meps_det_vdiv_2_5km_calculations&WIDTH=1438&HEIGHT=1504&CRS=EPSG%3A3411&BBOX=404935.5094684181%2C-3769428.4764078585%2C4977748.7994076125%2C1013263.5876175575 > > https://pasteboard.co/IHZjgXibtLyJ.png > > Thanks, > Alistair > > > On Sun, 5 Oct 2025 at 10:00, Seth G <[email protected]> wrote: >> __ >> Hi Alistair, >> >> Could you give an example request (I presume it is WMS?)? Are you rotating >> your map at all, or is it just the projection? >> >> There are some tests which reproject a UVRASTER LAYER at >> https://github.com/MapServer/MapServer/blob/29e4ae81620a2c50201101c763df0b9d8d540b67/msautotest/wxs/wms_uvraster_map_reprojection.map >> It sounds like an oversight, so if you are able to create a standalone test >> case, it would be worth opening an issue. >> >> Seth >> >> -- >> web:https://geographika.net & https://mapserverstudio.net >> mastodon: @[email protected] >> >> On Fri, Oct 3, 2025, at 11:59 AM, Alistair Everett via MapServer-users wrote: >>> Hi all, >>> >>> I'm trying to use the UVRASTER connection to plot wind barbs. I noticed if >>> I request the layer in a different projection the location of the arrows >>> are reprojected but the angle, and presumably vector components, are not - >>> rather they remain in the same direction relative to my screen. It's a >>> little unclear from the documentation if this is the expected behaviour for >>> UVRASTER or not? I included a pasteboard link to a screenshot to show what >>> I mean, compare for example vectors in the corners of the data and you will >>> see they point in the same direction relative to my screen, rather than >>> being rotated to match the projection. >>> >>> If this is expected, does anyone have any suggested ways of working around >>> this? >>> >>> If this is not expected, does anyone have any ideas what I've done wrong? I >>> can provide some sample data if someone wants to try to reproduce. >>> >>> I'm using: MapServer version 8.4.0 PROJ version 9.4 GDAL version 3.11 >>> OUTPUT=PNG OUTPUT=JPEG SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE >>> SUPPORTS=CAIRO SUPPORTS=ICONV SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER >>> SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT >>> SUPPORTS=WCS_SERVER SUPPORTS=SOS_SERVER SUPPORTS=OGCAPI_SERVER >>> SUPPORTS=FASTCGI SUPPORTS=THREADS SUPPORTS=GEOS SUPPORTS=PBF INPUT=JPEG >>> INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE INPUT=FLATGEOBUF >>> >>> Screenshot: https://pasteboard.co/WTgbexDmQaAe.png >>> >>> Example mapfile: https://pastebin.com/ibPc6gVK >>> >>> Thanks, >>> Alistair >>> >>> ----------------------------- >>> Dr Alistair Everett >>> Senioringeniør / Senior Software Engineer >>> Avdeling for Geoutvikling >>> >>> Phone: +47 939 68 985 >>> Email: [email protected] >>> >>> Meteorologisk Institutt, >>> Henrik Mohns plass 1, >>> 0313 Oslo >>> ----------------------------- >>> *Dr Alistair Everett* >>> Senioringeniør / Senior Software Engineer >>> Avdeling for Geoutvikling >>> >>> *Phone:* +47 939 68 985 >>> *Email:* [email protected] <mailto:[email protected]> >>> >>> *Meteorologisk Institutt*, >>> Henrik Mohns plass 1, >>> 0313 Oslo >>> >>> _______________________________________________ >>> MapServer-users mailing list >>> [email protected] >>> https://lists.osgeo.org/mailman/listinfo/mapserver-users >>> >>
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