Hello list,
I created a WCS with MapServer 7 (on windows), which displays elevation data.
I have some problems which I can't solve and hope you can support me.
1.) Since I'm using a Tileindex I need to fill the Layers metadata-tags
"wcs_size" and wcs_resolution". Unfortunately, the documentation of MapServer
doesn't give a hint what values to use for this tags. I read somewhere that the
values come from GDAL when you create the Tileindex with GDAL, but I didn't
create the index with GDAL.
2.) The Input data are 1km tiles with 2000 x 2000 x 8 BPP, 32-bit, 96dpi. If I
request the WCS I get a 24-bit image back. I tried to define different output
formats, but couldn't find a solution yet.
3.) I tried to display the WCS in QGIS, which works, but it works really slow
and I get an image with huge pixels back. If I request the height values and
compare it to the original data, they are correct, but instead of float-values
I get integer-values back. E. g. 42,33355m becomes 42m. Is there a way to
influence this?
4.) If I request the WCS via browser with version=1.0.0 I get a fast response.
If I request it with version 2.0 I always get a Timeout. Is there a problem
with the different versions? Maybe that explains why QGIS is so slow.
You find my mapfile below:
MAP
EXTENT 278000 5560000 536000 5828000
IMAGECOLOR 255 255 255
NAME "WCS_NW_DGM"
FONTSET "C:/ms4w/apps/GDI/fonts/fonts.list" # True-Type Schriften
MAXSIZE 5000
RESOLUTION 90.714285714285714285714285714286
STATUS on
UNITS meters
PROJECTION
"init=epsg:25832"
END
WEB
imagepath "/tmp/"
imageurl "/tmp/"
METADATA
"wcs_enable_request" "*"
"wcs_label" "WCS DGM"
"wcs_encoding" "UTF-8"
"wcs_title" "WCS NW DGM"
"wcs_onlineresource"
"http://vbrk21nt15.bezreg-koeln.nrw.de/wms/wcs_nw_dgm";
"wcs_description" "Höhenberechnungsdienst auf Basis des
DGM"
"wcs_keywordlist" "NRW-Atlas,NW,NRW,Bezirksregierung
Köln,Abteilung 7,Geobasis
NRW,Geobasisdaten,Landesvermessung,AdV,Arbeitsgemeinschaft der
Vermessungsverwaltungen der Länder"
END
END
#-----LAYER-----
LAYER
NAME "nw_dgm"
TILEINDEX "//bezreg-koeln.nrw.de/BRK/Abt7/72_URA/NAS/URA/DGM1/utm32/DGM1"
TILEITEM "LOCATION"
STATUS ON
TYPE RASTER
MINSCALE 1
MAXSCALE 50001
PROJECTION
"init=epsg:25832"
END
METADATA
"ows_srs" "EPSG:25832"
"wcs_extent" "278000 5560000 536000 5828000"
"wcs_size" "600 600"
"wcs_resolution" "1 1"
"wcs_label" "DGM Hoehen"
"wcs_native_format" "32-bit GeoTIF"
"wcs_rangeset_name" "Range 1"
"wcs_rangeset_label" "DGM Höhen"
END
END
END #map
Thanks in advance for any help!
Cora
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