[mapserver-users] rendering a raster crossing the antimeridian through a WMS

[fred p]

Thanks again for your advices.

Unfortunately, I get the same image with shp2img :
shp2img -m mapfile.map -o /tmp/foo -e -179.99 -89.99 179.99 89.99 -s 800
400 -l polar_orbiting_avhrr4 -i image/png -all_debug
Nothing special in the debug massages.

No change about the projection error message with a corrected projection
string or with projection auto. I activate the epsg:4326 (though this is
not exactly the projection of my data) definition to actually have a
projection defined into the layer without any error message.

2015-08-12 17:28 GMT+00:00 Jeff McKenna <jmckenna at gatewaygeomatics.com>:

> On 2015-08-12 11:43 AM, fred p wrote:
>
>> Thanks to Jeff for the answer.
>>
>> I simplified the mapfile to make it easier to read.
>>
>> Below I give the mapfile with these additional elements. I do not have
>> warnings anymore with a GetCapabilities request but the image I get
>> whith a GetMap request is still incomplete.
>>
>> Note that I get an error (/msProcessProjection(): Projection library
>> error. proj error "projection not named" for ""/) with a projection
>> block in the layer section if I declare the real projection definition
>> (/"+proj=longlat +a=6378160 +b=6356775 +no_defs "/). No error with
>> /"+init=epsg:4326"/ which is closed to the real projection definition.
>> As I have read somewhere that if not present the projection is read in
>> the data file, I have removed it (the image I get is the same).
>>
>>
>>
>> MAP
>>      STATUS       ON
>>      NAME         "foo"
>>      CONFIG       "MS_ERRORFILE" "stderr"
>>      IMAGETYPE    "agg"
>>      MAXSIZE      8192
>>      EXTENT       -180 -90 180 90
>>      PROJECTION
>>          "init=epsg:4326"
>>      END
>>      OUTPUTFORMAT
>>          NAME            "agg"
>>          DRIVER          "AGG/PNG"
>>          MIMETYPE        "image/png8"
>>          IMAGEMODE       "PC256"
>>          EXTENSION       "png"
>>      END
>>      WEB
>>          METADATA
>>              "ows_enable_request"            "*"
>>              "ows_sld_enabled"               "true"
>>              "wms_feature_info_mime_type"    "text/html"
>>              "ows_onlineresource"            "http://127.0.0.1:8080/wms"
>>              "wms_title"                     "WMS"
>>              "wms_srs"                       "epsg:4326"
>>          END
>>      END
>>      LAYER
>>          STATUS        ON
>>          TYPE          RASTER
>>          NAME          "polar_orbiting_avhrr4"
>>          DATA          "/tmp/polar_orbiting_avhrr4.tiff"
>>          OFFSITE       0 0 0
>>          PROCESSING    "RESAMPLE=NEAREST"
>>          METADATA
>>              "wms_title" "foo"
>>          END
>>          #PROJECTION
>>          #    "init=epsg:4326"
>>          #END
>>          #PROJECTION
>>          #    "+proj=longlat +a=6378160 +b=6356775 +no_defs"
>>          #END
>>      END
>> END
>>
>>
>>
> Give a good read to the projection page for MapServer (
> http://www.mapserver.org/mapfile/projection.html), take note of the
> Example#1, how to define the PROJ.4 parameters (I believe your error is
> because you've included the "+" by mistake), and then add in your
> projection block to your layer.  And never assume that MapServer can
> magically read your projection and then announce that to all of your WMS
> users: always define each layer's actual projection.  You can also
> experiment with the "PROJECTION AUTO" use, as described on that page, but I
> honestly avoid that and set all accurate projection definitions for each
> layer.
>
> If this was my situation, I'd test this first without WMS, just with the
> shp2img commandline tool, by modifying my output project (see the
> "Important Notes" at
> http://www.mapserver.org/mapfile/projection.html#important-notes) and
> making sure that this layer is reprojected correctly; once that works, and
> I'm satisfied with the map image, I'd start testing the WMS reprojection.
>
> -jeff
>
>
>
>
> --
> Jeff McKenna
> MapServer Consulting and Training Services
> http://www.gatewaygeomatics.com/
>
>
>
>
>
>
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