Geographic Information Systems Asked by Albert Tinon on September 28, 2021
I have a MapServer 7.0.7 map containing only a layer with a GeoTiff DEM.
It works perfectly with QGIS 3.0.3 but I cannot use it with ArcMap 10.5.
This is my map file:
MAP
OUTPUTFORMAT
NAME "GTiff"
DRIVER GDAL/GTiff
MIMETYPE "image/tiff"
IMAGEMODE FLOAT32
EXTENSION "tif"
TRANSPARENT ON
END
NAME "Modèle numérique de terrain"
EXTENT -6.0001389 39.9998611 10.0001389 52.0001389
MAXSIZE 4096
PROJECTION
"init=epsg:2154"
END
WEB
METADATA
"wcs_label" "WCS Server"
"wcs_onlineresource" "http://localhost/cgi-bin/mapserv?map=/tmp/testNaN.map&"
"wcs_enable_request" "*"
"wcs_fees" "none"
"wcs_accessconstraints" "none"
"wcs_keywordlist" "wcs,dem"
"wcs_metadatalink_type" "TC211"
"wcs_metadatalink_format" "text/plain"
"wcs_metadatalink_href" "http://localhost"
"wcs_address" ""
"wcs_city" "Paris"
"wcs_stateorprovince" "IDF"
"wcs_postcode" "75000"
"wcs_country" "France"
"wcs_contactelectronicmailaddress" "[email protected]"
"wcs_contactperson" "me"
"wcs_contactorganization" "unemployed"
"wcs_contactposition" "manager"
"wcs_contactvoicetelephone" ""
"wcs_contactfacimiletelephone" ""
END
END
LAYER
NAME TESTNAN
DATA "/tmp/tmp.tif"
STATUS ON
TYPE RASTER
PROCESSING "SCALE=AUTO"
PROJECTION
"init=epsg:2154"
END
METADATA
"Altitude_band_description" "Altitude en mètres"
"wcs_band_names" "Altitude"
"wcs_bandcount" "1"
"wcs_description" "Modèle numérique de terrain"
"wcs_enable_request" "*"
"wcs_label" "IGN BDAlti V2 (rés: 75m)"
"wcs_name" "BDALTI75"
"wcs_rangeset_label" "IGN BDAlti V2 (rés: 75m)"
"wcs_rangeset_name" "BDALTI75"
"wcs_rangeset_nullvalue" "-99999"
"wcs_srs" "EPSG:2154"
END
END
END
While I add my WCS server under ArcMap 10.5 without forcing the version. ArcMap makes two HTTP GET request
:/1 - - [14/Jun/2018:16:56:14 +0200] "GET /cgi-bin/mapserv?map=/tmp/testNaN.map&SERVICE=WCS&SERVICE=WCS&REQUEST=GetCapabilities HTTP/1.1" 200 6816 ::1 - - [14/Jun/2018:16:56:14 +0200] "GET /cgi-bin/mapserv?map=/tmp/testNaN.map&SERVICE=WCS&SERVICE=WCS&VERSION=2.0.1&REQUEST=DescribeCoverage HTTP/1.1" 400 536
As you can see the second request does not work and Mapserver answer a HTTP 400 error.
While entering this request in Chrome I can have the full error:
msWCSDescribeCoverage20(): WCS server error. Missing COVERAGEID parameter.
the only workaround I found is to force the version to 1.0.0
How do I make MapServer understand ArcMap WCS 2.0.1 protocol?
Your question should be how to make ESRI to fix their bug.
Table 11 — WCS DescribeCoverage components in the WCS 2.0.1 core standard states that coverageId is a mandatory parameter in DescribeCoverage request and the value must be one or more coverage names.
If you have only one coverage in your service a workaroud could be to add a rewrite rule to the Apache server to add &coverageId=your_coverage into the non-standard request that ArcMaps makes.
I wonder if ArcMap behaves always like that or if there is something special in your MapServer configuration. GeoServer requires coverageId as well as you can test with
https://demo.geo-solutions.it/geoserver/wcs?service=WCS&version=2.0.1&request=DescribeCoverage&
Could you test if ArcMap can add coverages from that service?
BTW. Why do you have SCALE=AUTO in your mapfile? I am not sure if it has an effect on WCS service, but if it does then it alters your data which is not the purpose of WCS.
Answered by user30184 on September 28, 2021
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