Hi Andrea,
Thanks for the links; those are incredibly helpful. We are asking since
we supporting a use case which involves imagery (pixel by area) and
elevation (pixel by point) together.
Just to make sure, it sounds like gdal's 'pixel by area' maps to 'pixel
is center', right?
Thanks for noting the extensibility of WCS 2.0. Are there existing
vendor profile examples that I could crib off of?
Cheers,
Jim
On 04/01/2015 02:56 AM, Andrea Aime wrote:
Hi Andrew,
in geotools we call this issue "pixel is center" vs " pixel is corner".
OGC mandates the "pixel is center" interpretation as far as I know,
see also:
http://gis.stackexchange.com/questions/122670/is-there-a-standard-for-the-coordinates-of-pixels-in-georeferenced-rasters
http://mapserver.org/fr/development/rfc/ms-rfc-107.html
As far as I know, GeoTools tries to work "pixel is center" from
beginning to end, and there
are no ways to control that, also, WCS follows the OGC interpretation
strictly and does not
offer a way to return "pixel is corner" rasters, but I may be wrong.
I'm cc'ing Daniele, he should know more on this matter.
That said, especially in WCS 2.0, built to be extensible, one could
put together a vendor profile that allows controlling
the pixel interpretation for the outputs.
Cheers
Andrea
On Tue, Mar 31, 2015 at 11:28 PM, Andrew Annex <[email protected]
<mailto:[email protected]>> wrote:
Hello GeoServer users,
I am making wcs 1.0.0 requests for geotiffs against a coverage layer.
Does GeoServer support returning geotiffs via wcs that are "Point"
instead of "Area" pixels for the meta-data value: "AREA_OR_POINT"?
This
metadata field is further explained here:
http://www.gdal.org/gdal_datamodel.html. By default the geotiff writer
assumes area, and that writer appears to be used in the
GeoTIFFCoverageResponseDelegate. Is there some way to set this as
a hint
in the wcs query url or is there something I can overwrite when
extending the AbstractGridCoverage2DReader and/or the
AbstractGridFormat
so that the ResponseDelegate will pick up on that hint? Although
it may
not matter I am working with geoserver 2.5.2 / geotools 11.2.
Also if this question is more appropriate for the geotools user
list let
me know.
Thanks - Andrew
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