Baffled by a MapServer WCS

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Baffled by a MapServer WCS

Ari Jolma-2
Hi,

I'm trying to get the GDAL WCS client working and in the process trying
different WCS servers.

I just found this http://nsidc.org/cgi-bin/atlas_north and I'm trying to
use its WCS

I'm making WCS 1.0 and 1.1 GetCoverage calls on a dataset that seems to
be natively served in EPSG:32661:

http://nsidc.org/cgi-bin/atlas_north?SERVICE=WCS&REQUEST=GetCoverage&VERSION=1.0.0&COVERAGE=sea_ice_concentration_01&FORMAT=GeoTIFF&BBOX=-3961770.085,4312961.971,-3911770.085,4362961.971&WIDTH=2&HEIGHT=2&CRS=EPSG:32661

Error: Requested BBOX
(-5336721.37969822,2086027.77164232,-5316625.78536214,2109378.29356774)
is outside requested coverage BBOX
(-3961770.085,-3961769.906,3961769.894,4362961.971)

http://nsidc.org/cgi-bin/atlas_north?SERVICE=WCS&VERSION=1.1.1&REQUEST=GetCoverage&IDENTIFIER=sea_ice_concentration_01&FORMAT=image%2Ftiff&BOUNDINGBOX=-3924270.085,4350461.971,-3949270.085,4325461.971,urn:ogc:def:crs:EPSG::32661&RangeSubset=pixels&WIDTH=2&HEIGHT=2&GridBaseCRS=urn:ogc:def:crs:EPSG::32661&GridCS=urn:ogc:def:cs:OGC:0.0:Grid2dSquareCS&GridType=urn:ogc:def:method:WCS:1.1:2dGridIn2dCrs&GridOrigin=-3949270.085,4350461.971&GridOffsets=25000,25000

Requested BBOX
(-5335202.686558,2107853.71031472,-5335202.686558,2107853.71031472) is
outside requested coverage BBOX
(-3961770.085,-3961769.906,3961769.894,4362961.971)

For the first one I'm making a fix on the GDAL side for the grid origin
not being at the center of a pixel and for the second one I'm setting
the offsets to positive values and leaving out the 0,0 in the middle.
For the 2nd one I'm also making axis order inversion since EPSG::32661
is N,E. That's why the GridOrigin in like it is. I'm not sure whether
MapServer applies axis inversion in the 1.1 in this case.

Anyway, the baffling thing is that MapServer reports in both cases the
requested BBOX (the one I'm sending, I guess) to be outside coverage
BBOX and changed from what I sent -- there is obviously a reprojection
done. The values are strange and I can't find/think in what CRS they are.

Any ideas?

Thanks,

Ari


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Re: Baffled by a MapServer WCS

Berger, Cora
Dear Ari,

this request works fine:
http://nsidc.org/cgi-bin/atlas_north?SERVICE=WCS&VERSION=1.0.0&REQUEST=GetCoverage&FORMAT=GeoTIFF&COVERAGE=sea_ice_concentration_01&BBOX=-3961770,-3961769,3961769,4362961&CRS=EPSG:32661&RESPONSE_CRS=EPSG:32661&WIDTH=317&HEIGHT=333

Cheers
Cora


>-----Urspr√ľngliche Nachricht-----
>Von: mapserver-users [mailto:[hidden email]] Im
>Auftrag von [hidden email]
>Gesendet: Dienstag, 14. November 2017 21:00
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>Betreff: mapserver-users Digest, Vol 118, Issue 11
>
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>Today's Topics:
>
>   1. Baffled by a MapServer WCS (Ari Jolma)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Tue, 14 Nov 2017 11:18:16 +0200
>From: Ari Jolma <[hidden email]>
>To: [hidden email]
>Subject: [mapserver-users] Baffled by a MapServer WCS
>Message-ID: <[hidden email]>
>Content-Type: text/plain; charset=utf-8; format=flowed
>
>Hi,
>
>I'm trying to get the GDAL WCS client working and in the process trying
>different WCS servers.
>
>I just found this http://nsidc.org/cgi-bin/atlas_north and I'm trying to
>use its WCS
>
>I'm making WCS 1.0 and 1.1 GetCoverage calls on a dataset that seems to
>be natively served in EPSG:32661:
>
>http://nsidc.org/cgi-
>bin/atlas_north?SERVICE=WCS&REQUEST=GetCoverage&VERSION=1.0.0&CO
>VERAGE=sea_ice_concentration_01&FORMAT=GeoTIFF&BBOX=-
>3961770.085,4312961.971,-
>3911770.085,4362961.971&WIDTH=2&HEIGHT=2&CRS=EPSG:32661
>
>Error: Requested BBOX
>(-5336721.37969822,2086027.77164232,-5316625.78536214,2109378.29356774)
>is outside requested coverage BBOX
>(-3961770.085,-3961769.906,3961769.894,4362961.971)
>
>http://nsidc.org/cgi-
>bin/atlas_north?SERVICE=WCS&VERSION=1.1.1&REQUEST=GetCoverage&IDE
>NTIFIER=sea_ice_concentration_01&FORMAT=image%2Ftiff&BOUNDINGBOX=-
>3924270.085,4350461.971,-
>3949270.085,4325461.971,urn:ogc:def:crs:EPSG::32661&RangeSubset=pixels&WI
>DTH=2&HEIGHT=2&GridBaseCRS=urn:ogc:def:crs:EPSG::32661&GridCS=urn:ogc
>:def:cs:OGC:0.0:Grid2dSquareCS&GridType=urn:ogc:def:method:WCS:1.1:2dGridIn
>2dCrs&GridOrigin=-3949270.085,4350461.971&GridOffsets=25000,25000
>
>Requested BBOX
>(-5335202.686558,2107853.71031472,-5335202.686558,2107853.71031472) is
>outside requested coverage BBOX
>(-3961770.085,-3961769.906,3961769.894,4362961.971)
>
>For the first one I'm making a fix on the GDAL side for the grid origin
>not being at the center of a pixel and for the second one I'm setting
>the offsets to positive values and leaving out the 0,0 in the middle.
>For the 2nd one I'm also making axis order inversion since EPSG::32661
>is N,E. That's why the GridOrigin in like it is. I'm not sure whether
>MapServer applies axis inversion in the 1.1 in this case.
>
>Anyway, the baffling thing is that MapServer reports in both cases the
>requested BBOX (the one I'm sending, I guess) to be outside coverage
>BBOX and changed from what I sent -- there is obviously a reprojection
>done. The values are strange and I can't find/think in what CRS they are.
>
>Any ideas?
>
>Thanks,
>
>Ari
>
>
>
>
>------------------------------
>
>Subject: Digest Footer
>
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>mapserver-users mailing list
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>
>------------------------------
>
>End of mapserver-users Digest, Vol 118, Issue 11
>************************************************
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Re: Baffled by a MapServer WCS

Ari Jolma-2
Berger, Cora kirjoitti 15.11.2017 klo 08:44:
> Dear Ari,
>
> this request works fine:
> http://nsidc.org/cgi-bin/atlas_north?SERVICE=WCS&VERSION=1.0.0&REQUEST=GetCoverage&FORMAT=GeoTIFF&COVERAGE=sea_ice_concentration_01&BBOX=-3961770,-3961769,3961769,4362961&CRS=EPSG:32661&RESPONSE_CRS=EPSG:32661&WIDTH=317&HEIGHT=333

Thanks Cora,

Yes, but that's using version 1.0.0. I'm testing version 1.1.

Ari

>
> Cheers
> Cora
>
>
>> -----Urspr√ľngliche Nachricht-----
>> Von: mapserver-users [mailto:[hidden email]] Im
>> Auftrag von [hidden email]
>> Gesendet: Dienstag, 14. November 2017 21:00
>> An: [hidden email]
>> Betreff: mapserver-users Digest, Vol 118, Issue 11
>>
>> Send mapserver-users mailing list submissions to
>> [hidden email]
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> https://lists.osgeo.org/mailman/listinfo/mapserver-users
>> or, via email, send a message with subject or body 'help' to
>> [hidden email]
>>
>> You can reach the person managing the list at
>> [hidden email]
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of mapserver-users digest..."
>>
>>
>> Today's Topics:
>>
>>    1. Baffled by a MapServer WCS (Ari Jolma)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Tue, 14 Nov 2017 11:18:16 +0200
>> From: Ari Jolma <[hidden email]>
>> To: [hidden email]
>> Subject: [mapserver-users] Baffled by a MapServer WCS
>> Message-ID: <[hidden email]>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> Hi,
>>
>> I'm trying to get the GDAL WCS client working and in the process trying
>> different WCS servers.
>>
>> I just found this http://nsidc.org/cgi-bin/atlas_north and I'm trying to
>> use its WCS
>>
>> I'm making WCS 1.0 and 1.1 GetCoverage calls on a dataset that seems to
>> be natively served in EPSG:32661:
>>
>> http://nsidc.org/cgi-
>> bin/atlas_north?SERVICE=WCS&REQUEST=GetCoverage&VERSION=1.0.0&CO
>> VERAGE=sea_ice_concentration_01&FORMAT=GeoTIFF&BBOX=-
>> 3961770.085,4312961.971,-
>> 3911770.085,4362961.971&WIDTH=2&HEIGHT=2&CRS=EPSG:32661
>>
>> Error: Requested BBOX
>> (-5336721.37969822,2086027.77164232,-5316625.78536214,2109378.29356774)
>> is outside requested coverage BBOX
>> (-3961770.085,-3961769.906,3961769.894,4362961.971)
>>
>> http://nsidc.org/cgi-
>> bin/atlas_north?SERVICE=WCS&VERSION=1.1.1&REQUEST=GetCoverage&IDE
>> NTIFIER=sea_ice_concentration_01&FORMAT=image%2Ftiff&BOUNDINGBOX=-
>> 3924270.085,4350461.971,-
>> 3949270.085,4325461.971,urn:ogc:def:crs:EPSG::32661&RangeSubset=pixels&WI
>> DTH=2&HEIGHT=2&GridBaseCRS=urn:ogc:def:crs:EPSG::32661&GridCS=urn:ogc
>> :def:cs:OGC:0.0:Grid2dSquareCS&GridType=urn:ogc:def:method:WCS:1.1:2dGridIn
>> 2dCrs&GridOrigin=-3949270.085,4350461.971&GridOffsets=25000,25000
>>
>> Requested BBOX
>> (-5335202.686558,2107853.71031472,-5335202.686558,2107853.71031472) is
>> outside requested coverage BBOX
>> (-3961770.085,-3961769.906,3961769.894,4362961.971)
>>
>> For the first one I'm making a fix on the GDAL side for the grid origin
>> not being at the center of a pixel and for the second one I'm setting
>> the offsets to positive values and leaving out the 0,0 in the middle.
>> For the 2nd one I'm also making axis order inversion since EPSG::32661
>> is N,E. That's why the GridOrigin in like it is. I'm not sure whether
>> MapServer applies axis inversion in the 1.1 in this case.
>>
>> Anyway, the baffling thing is that MapServer reports in both cases the
>> requested BBOX (the one I'm sending, I guess) to be outside coverage
>> BBOX and changed from what I sent -- there is obviously a reprojection
>> done. The values are strange and I can't find/think in what CRS they are.
>>
>> Any ideas?
>>
>> Thanks,
>>
>> Ari
>>
>>
>>
>>
>> ------------------------------
>>
>> Subject: Digest Footer
>>
>> _______________________________________________
>> mapserver-users mailing list
>> [hidden email]
>> https://lists.osgeo.org/mailman/listinfo/mapserver-users
>>
>> ------------------------------
>>
>> End of mapserver-users Digest, Vol 118, Issue 11
>> ************************************************
> _______________________________________________
> mapserver-users mailing list
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> https://lists.osgeo.org/mailman/listinfo/mapserver-users

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