[mapserver-users] UNION raster layers returns blank image

[Travis Kirstine]

Tamas,

Thanks for your response, do you know if this is on the roadmap?

Regards

On 3 October 2011 14:01, Tamas Szekeres <szekerest at gmail.com> wrote:
> Hi,
> The union layer approach is working only for the vector based layers at the
> moment.
> Best regards,
> Tamas
>
>
> 2011/10/3 Travis Kirstine <traviskirstine at gmail.com>
>>
>> Hi All,
>>
>> I have been having some issues using the UNION option in the mapfile.
>> I'm trying to set up a WMS server with several "source" raster layers
>> and provide them all as a single union layer to the client.   I don't
>> want the source layers visible in the GetCapabilities, only the union
>> layer so I have been using a combination of the own_enable_request and
>> CONNECTIONTYPE UNION.  It seems to work in the GetCapabilites, only
>> the union layer appears however only blank images are returned from
>> the GetMap requests.  The layers portion of my mapfile is below, I
>> have set the "ows_enable_request" "*" in the WEB METADATA.  Any help
>> would be much appreciated
>>
>>
>>    # York Region 2009 - Union
>>    LAYER
>>        NAME "0937york_union"
>>        TYPE RASTER
>>        CONNECTIONTYPE UNION
>>        CONNECTION
>>
>> "0937york_1km_mstif,0937york_5km_mstif,0937york_10km_mstif,0937york_overall_mstif"
>>        METADATA
>>            "wms_title" "York Region UNION"
>>            "wms_extent" "594999 4842001 649999 4918001"
>>        END
>>        CLASS
>>        END
>>        PROJECTION
>>            "init=epsg:26917"
>>        END
>>    END
>>    # York Region 2009 - 15cm
>>    LAYER
>>        NAME "0937york_1km_mstif"
>>        TYPE RASTER
>>        TILEINDEX /var/local/data/0937YORK_1km_mstif/york_1km_mstindex
>>        TILEITEM location
>>        MAXSCALEDENOM 7500
>>        OFFSITE 0 0 0
>>        METADATA
>>            "ows_enable_request" "* !GetCapabilities"
>>        END
>>        PROJECTION
>>            "init=epsg:26917"
>>        END
>>    END
>>    LAYER
>>        NAME "0937york_5km_mstif"
>>        TYPE RASTER
>>        TILEINDEX /var/local/data/0937YORK_5km_mstif/york_5km_mstindex
>>        TILEITEM location
>>        MINSCALEDENOM 7500
>>        MAXSCALEDENOM 40000
>>        OFFSITE 0 0 0
>>        METADATA
>>            "ows_enable_request" "* !GetCapabilities"
>>        END
>>        PROJECTION
>>            "init=epsg:26917"
>>        END
>>    END
>>    LAYER
>>        NAME "0937york_10km_mstif"
>>        TYPE RASTER
>>        TILEINDEX /var/local/data/0937YORK_10km_mstif/york_10km_mstindex
>>        TILEITEM location
>>        MINSCALEDENOM 40000
>>        MAXSCALEDENOM 400000
>>        OFFSITE 0 0 0
>>        METADATA
>>            "ows_enable_request" "* !GetCapabilities"
>>        END
>>        PROJECTION
>>            "init=epsg:26917"
>>        END
>>    END
>>    LAYER
>>        NAME "0937york_overall_mstif"
>>        TYPE RASTER
>>        DATA
>> /var/local/data/0937YORK_overall_mstif/0937YORK_100m_overall.tif
>>        MINSCALEDENOM 400000
>>        OFFSITE 0 0 0
>>        METADATA
>>            "ows_enable_request" "* !GetCapabilities"
>>        END
>>        PROJECTION
>>            "init=epsg:26917"
>>        END
>>    END
>>
>>
>> Regards
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>
>