Dear all,
I'm working with a MAP having one single raster layer which points to a
georeferenced raster file.
Users of my application can change the data shown by using mapscript
'data' susbtitution as I commented many previous messages:
My layer in map file:
=====================
LAYER
NAME landuse
TYPE RASTER
DATA "file01.tif"
END
In globals.php:
===============
$wdata=$_REQUEST['wdata']; # wdata points to a new raster image selected by
user
if ($wdata != '') {
$mylayer=$map->getLayerByName('landuse');
$mylayer->set("data",$wdata);
}
I've recently changed the layer definition a little to make it queriable
and it works nicely:
LAYER
NAME landuse
TYPE RASTER
DATA "file01.tif"
TOLERANCE 0
TOLERANCEUNITS pixels
TEMPLATE void
METADATA
"RESULT_HEADERS" "xcoord,ycoord"
"RESULT_FIELDS" "x,y"
END
END
However, I've noticed that everything works ok as long as the raster
images cover the same area as the one initially defined in then map file.
When I switched to a new raster (i.e. centered at different geographic
coordinates), the query reported sometimes a "no data found" message.
It seems that the information about layer extension is read once from
MAP file when loading Pmapper and isn't updated although 'data' had been
changed in globals.php. I thought defining layer EXTENT in map file
would work but it doesn't.
A workaround to this seem to be declaring in the mapfile a "dumb" blank
georeferenced raster which englobe all areas. Doing so, no matter which
new raster is loaded "mapscriptically" the query tool will work ok.
Comments and/or ideas would be appreciated.
Regards
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