hi,
i'm trying to use mapserver-provided DEM layers within mapstore2, which
expects 'big-endian encoded' BIL format to display elevation/build
terrain relief with cesium. My mapserver layer is built with a tileindex
of asc files, and that works just great when rendering as png with some
styling.
i've reported my findings about what is expected within mapstore2 (which
is mostly tested against geoserver) here;
https://github.com/georchestra/mapstore2-georchestra/issues/331.
i've configured my outputformat as is in mapserver (found on
https://worldwind.earth/elevation-server.html):
OUTPUTFORMAT
NAME "bil"
DRIVER "GDAL/EHdr"
MIMETYPE "application/bil16"
IMAGEMODE INT16
EXTENSION "bil"
END
and looking at the binary data returned by a request with
application/bil16 format, this seems correctly encoded as big-endian but
mapstore2 doesnt like it, and after testing a bit with a DEM served by
geoserver my understanding is that mapstore2 would expect data encoded
as little-endian.
is there a way to specify that in gdal output formats ? looking at
https://gdal.org/drivers/raster/ehdr.html it seems the ehdr/bil format
doesnt provide much options, there seem to be support to specify
byteorder via a sidecar file when reading a hdr file, but i dunno how to
shoehorn that inside mapserver.
i've also looked at the various composite/processing options in
mapserver, and i havent found an operation that would allow to swap
bytes on the fly in the raster when computing the output, but i might
have looked wrong.
Any hints ?
Thanks !
--
Landry Breuil
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