On Sep 8, 2011, at 8:28 PM, Daniel Morissette wrote:
> On 11-09-08 09:02 PM, Mr. Puneet Kishor wrote:
>>
>> On Sep 8, 2011, at 7:43 PM, Daniel Morissette wrote:
>>>
>>> Maybe call $map->save("/tmp/my.map") in your script after the map and layer
>>> have been populated and paste the result... that may give us a hint...
>>>
>>
>> wow! this is a super-awesome debugging technique. I have sent you the map
>> file off list to not pollute the entire list serve.
>>
>
> I was able to reproduce the issue with the copy of the mapfile you sent
> off-list.
>
> It turns out that mappostgis.c's msPostGISLayerGetExtent() is hardcoded to
> always return
>
> {minx = -25000000, miny = -25000000, maxx = 25000000, maxy = 25000000}
>
> ...and then it returns MS_SUCCESS.
>
> I think this function should either be left unimplemented (this way MapServer
> would fallback on other mechanisms), or return MS_FAILURE to indicate to the
> calling code that it didn't do anything useful.
>
> A quick search indicates an open ticket about the issue:
>
> http://trac.osgeo.org/mapserver/ticket/3585
>
> You could bump the ticket and hope someone works on it at the FOSS4G code
> sprint next week.
>
> The short term fix for you would be to set the "ows_extent" metadata in your
> layer:
>
> METADATA
> "ows_extent" "-180 -90 180 90"
> ...
> END
>
Thanks Daniel. I will bump the ticket. For now, see below --
Using the "my.map" file I sent you, with no further modifications to it, I am
able to successfully get an image back via
[http://localhost.local/cgi-bin/gmna?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&BBOX=-180,-90,180,90&SRS=EPSG:4326&WIDTH=1200&HEIGHT=600&LAYERS=gmna&STYLES=&FORMAT=image/png&TRANSPARENT=true]
Note, no further modifications is required, that is, not even the "ows_extent"
"-180 -90 180 90" bit in the layer METADATA. and I still get a good image.
However, if I use the following program to access the same map file, I get the
spurious "minx = -25000000, miny = -25000000, maxx = 25000000, maxy = 25000000"
in the GetCapabilities.
Finally, if I add the "ows_extent" "-180 -90 180 90" line in the layer METADATA
in the "my.map" file, the GetCapabilities returns the correct bounds now,
however, the image is still blank.
#!/opt/local/bin/perl
use strict;
use mapscript;
my $wms = new mapscript::OWSRequest();
$wms->setParameter("SERVICE", "WMS" );
$wms->setParameter("VERSION", "1.1.1" );
$wms->setParameter("REQUEST", "GetMap" );
$wms->setParameter("BBOX", "-180,-90,180,90" );
$wms->setParameter("LAYERS", "gmna");
$wms->setParameter("SRS", "EPSG:4326");
$wms->setParameter("WIDTH", "1200");
$wms->setParameter("HEIGHT", "600");
$wms->setParameter("FORMAT", "image/png");
$wms->setParameter("TRANSPARENT", "true");
my $map = new
mapscript::mapObj("/Users/punkish/Sites/test/mapscript/my.map");
if(!$map) {
warn "New mapObj() error: $mapscript::ms_error->{message}\n";
}
my $io = mapscript::msIO_installStdoutToBuffer();
my $dispatch_out = $map->OWSDispatch( $wms );
printf "%s\n", mapscript::msIO_getStdoutBufferString();
I have now spent an enormous amount of time on this, and for now, I have to
move on. This is just not working out. Maybe I will try some other technique,
perhaps this mode=tile to see if I can get MapServer powered maps in my apps.
Thanks much for your help. If you (or anyone else) can come up with a bright
idea, I will be happy to try it.
Puneet.
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