I'm not sure what's going on, so I'm going to describe what I'm observing.
If I make the following WCS request (using the provided Img_Sample data)
/geoserver/ows?service=wcs&version=1.1.0&request=GetCoverage&identifier=Img_Sample&format=image/tiff&boundingbox=20.7052,-130.85168,54.1141,-62.0054,urn:ogc:def:crs:EPSG::4326&RangeSubset=contents
I get roughly, an 8 MB response with the image resolution being 983x2026
pixels.
If I make the following request (narrowing the bounding box):
/geoserver/ows?service=wcs&version=1.1.0&request=GetCoverage&identifier=Img_Sample&format=image/tiff&boundingbox=54,-63,54.1141,-62.0054,urn:ogc:def:crs:EPSG::4326&RangeSubset=contents
I get roughly, a 33 MB response with the image resolution being 983x8569
pixels.
And so forth. The smaller the bounding box, the exceedingly big the
response (until I start seeing clipping errors). Also, the width stays
constant at 983 pixels. I've tried this with other data, and reproduced
similar behaviour. If I do the same boundingbox extent reduction with
MapServer, I get smaller responses, with a lower resolution (image
size). Is GeoServer somehow upsampling the data, ignoring the grid
definition of the coverage described in the Coverage Description response?
Using GDAL as a client, I'm getting ridiculous amounts of data for a 2x2
request. (See what Frank was doing here:
http://jira.codehaus.org/browse/GEOS-1717)
I first noticed this with the following GeoServer instance. Here's the
first requestmade by GDAL. It is a 2x2 request, and it's returning 11
GB(!!) of data.
(FYI: Replace DOT with . in the domain to try it out. I don't want any
bots triggering this while crawling this post.)
http://geodataDOTnationaalgeoregisterDOTnl/ahn2/wcs?SERVICE=WCS&VERSION=1.1.1&REQUEST=GetCoverage&IDENTIFIER=ahn2_5m&FORMAT=image%2Ftiff&BOUNDINGBOX=19242.5,506242.5,19247.5,506247.5,urn:ogc:def:crs:EPSG::28992&RangeSubset=contents
Am I forgetting something, because something doesn't seem right to me.
Cheers,
Tim Astle
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