[mapserver-users] Re: problem with mercator projection

[fred p]

Thanks to Jukka for this first input.
The given example is similar to what I want to get.
Rendering the image in separate tiles could be an alternative but for some
reasons I would prefer get the whole image within a single call to the
server.
Anybody has got an idea ?
Fred



2011/9/23 Rahkonen Jukka <Jukka.Rahkonen at mmmtike.fi>

> **
> Hi,
>
> You perhaps want to achieve a map presenting the whole world once and then
> some extra from the second round in the margins like
> http://www.openstreetmap.org/?lat=59&lon=-39&zoom=1&layers=M?  It might
> well be that the transformation functions consider that for EPSG:3395 the
> maximum values really are the bounds reported at
> http://spatialreference.org/ref/epsg/3395/ and values outside the value
> range are invalid. I have no idea about how you could get your map out from
> WMS.  Could you consider composing it from pieces somehow?
>
> -Jukka Rahkonen-
>
>
>  ------------------------------
>  *Lähettäjä:* mapserver-users-bounces at lists.osgeo.org [mailto:
> mapserver-users-bounces at lists.osgeo.org] *Puolesta *fred p
> *Lähetetty:* 23. syyskuuta 2011 11:10
> *Vastaanottaja:* mapserver-users at lists.osgeo.org
> *Aihe:* [mapserver-users] Re: problem with mercator projection
>
>   Hello
> Nobody has got an idea whether I am wrong somewhere or there is a problem
> in the image or ... ?
> I add the result is OK in EPSG:4326 whatever the bbox is and it is OK too
> in EPSG:3395 provided the extent longitude is smaller than 360°. However
> when it is higher...
> Thanks in advance
>
> 2011/9/21 fred p <mapoubelle22 at gmail.com>
>
>> Hello !
>>
>> I am trying to serve an image in Mercator projection (EPSG:3395) with an
>> extent larger than "360° in longitude" but I get a truncated and reversed in
>> longitude image.
>> Do I make a mistake somewhere?
>> Thanks for your help
>>
>>  The mapfile content and the gdalinfo output on the original image are
>> given below.
>>
>>
>> Mapserver version: 6.0.1
>>
>> Call to mapserver:
>> /path/to/mapserv -nh "QUERY_STRING=map=/tmp/world.
>>   map&service=wms&LAYERS=countries&FORMAT=image/png&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&STYLES=&SRS=epsg:3395&BBOX=-26080550.098232,-15000000,26080550.098232,15000000&WIDTH=885&HEIGHT=509"
>> > foo.png
>>
>> Content of the mapfile:
>> MAP
>>   EXTENT -180 -90 180 90
>>   IMAGECOLOR 255 255 255
>>   IMAGETYPE agg
>>   STATUS ON
>>
>>   OUTPUTFORMAT
>>     NAME "agg"
>>     MIMETYPE "image/png"
>>     DRIVER "AGG/PNG"
>>     EXTENSION "png"
>>     IMAGEMODE "RGBA"
>>     TRANSPARENT TRUE
>>     FORMATOPTION "INTERLACE=false"
>>   END
>>
>>   PROJECTION
>>     "init=epsg:4326"
>>   END
>>
>>   WEB
>>     METADATA
>>       "wms_srs"    "epsg:4326 epsg:3395 epsg:900913 epsg:3995"
>>       "OWS_ENABLE_REQUEST"    "*"
>>     END
>>   END
>>
>>   LAYER
>>     DATA "/tmp/world.tif"
>>     NAME "countries"
>>     PROJECTION
>>       "init=epsg:4326"
>>     END
>>     STATUS ON
>>     TYPE RASTER
>>   END
>>
>> END
>>
>>  Output of gdalinfo command:
>> $ gdalinfo /tmp/world.tif
>> Driver: GTiff/GeoTIFF
>> Files: /tmp/world.tif
>> Size is 1000, 500
>> Coordinate System is:
>> GEOGCS["WGS 84",
>>     DATUM["WGS_1984",
>>         SPHEROID["WGS 84",6378137,298.257223563,
>>             AUTHORITY["EPSG","7030"]],
>>         AUTHORITY["EPSG","6326"]],
>>     PRIMEM["Greenwich",0],
>>     UNIT["degree",0.0174532925199433],
>>     AUTHORITY["EPSG","4326"]]
>> Origin = (-180.000000000000000,90.000000000000000)
>> Pixel Size = (0.360000000000000,-0.360000000000000)
>> Metadata:
>>   TIFFTAG_DOCUMENTNAME=/tmp/world.tif
>>   TIFFTAG_XRESOLUTION=72
>>   TIFFTAG_YRESOLUTION=72
>>   TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
>>   AREA_OR_POINT=Area
>> Image Structure Metadata:
>>   INTERLEAVE=BAND
>> Corner Coordinates:
>> Upper Left  (-180.0000000,  90.0000000) (180d 0'0.00"W, 90d 0'0.00"N)
>> Lower Left  (-180.0000000, -90.0000000) (180d 0'0.00"W, 90d 0'0.00"S)
>> Upper Right ( 180.0000000,  90.0000000) (180d 0'0.00"E, 90d 0'0.00"N)
>> Lower Right ( 180.0000000, -90.0000000) (180d 0'0.00"E, 90d 0'0.00"S)
>> Center      (   0.0000000,   0.0000000) (  0d 0'0.01"E,  0d 0'0.01"N)
>> Band 1 Block=1000x8 Type=Byte, ColorInterp=Gray
>>
>>
>>
>
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