Hello All,

I'm using GeoServer for providing meteorological data through WMS. All
worked great so far but I'm now stuck implementing wind arrows layer.

The long story short: getting the data through WMS and EPSG:4326
projection works but does not work when requested through EPSG:3857
(Mercator) - it is returning only blank PNGs.
The same technique works for another (raster) layer I have.

The details:
GeoServer 2.7 with NetCDF store plugin and WPS extension.

Store:
NetCDF (NetCDF store plugin)

Layer:
Single banded (wind direction attribute only), Native SRS/Declared SRS -
EPSG:4326, default Tile Caching settings, Time dimension enabled.

Style:
RasterAsPointCollection transformation and single rule with
"extshape://narrow" graphics (rotation hardcoded for now). Could post the
entire SLD if interested.

So with the configuration above the arrows show in the Layer Preview but
not when I request them with EPSG:3857 projection (leaflet.js). I'm
getting blank PNGs only, there are no errors in the server log.
As I just mentioned above, the same configuration works like a charm for
another (raster only) layer where I visualize the wind speed.

I'm inclined to think that raster-to-vector rendering transformation can
only be requested in its native projection though I hope I'm really wrong
here or I'm just missing something.

Do you guys have any suggestion?
Any help will be so much appreciated.

Thanks,
Ivan

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