[gdal-dev] [Geoserver-devel] GML lat-lon coverages and interoperability

[Andrea Aime]

Hi Even,
in CIS 1.1 they state:

Coverages are assumed to have a 1:1 correlation between the axis names
given in axis-Labels and gridLabels, i.e.: they shall relate pairwise,
given by their sequence position. For example, axisLabels=“Lat Long h date”
and gridLabels={i j k l} implies a correspondence of Lat with i, Long with
j, h with k, and date with l.

If there is no 1:1 correspondence between geographic and raster space axis,
then I see no other way but to use Function to explicitly correlate the two.
How would you propose to proceed instead?

Cheers
Andrea


On Mon, Apr 10, 2017 at 3:31 PM, Even Rouault <even.rouault at spatialys.com>
wrote:

> On lundi 10 avril 2017 15:06:55 CEST Andrea Aime wrote:
>
> > Hi,
>
> > sorry I lost track of the subject. So, to close up, and approach where
> the
>
> > envelope is reported as "lat lon" and the "i j" raster space
>
> > axis would map pairwise, so i pointing north-wards and j east-wards,
> would
>
> > be considered valid?
>
> > E.g., if one rescaling says "i is going to be 200 pixels" it really means
>
> > the output image will be 200 pixels tall?
>
>
>
> IMHO, importing EPSG axis order mess in raster space would seem to be
> foolish to me and cause major annoyances. Performance-wise, processing
> flipped rasters with classic algorithms that process line per line would be
> terrible as soon as they are large enough, since reading each line would in
> practice require to read the whole raster each time.
>
>
>
> Even
>
>
>
> --
>
> Spatialys - Geospatial professional services
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