Hi
I'm trying to render a tiff onto map, the tiff presents NDVI anomalies value,
which is in (-2, 2) and with -2 as the no-data pixels. I'm rendering the NDVI
result layer from red to green for pixels values from -2 to 2(not include -2
and 2), and transparent for -2.
And the tiff file is under Albers projection, but the map or what we want to
see of the tiff is Web Mercator, so I re-projected the NDVI result layer.
The problem is when re-projecting from Albers to Web Mercator, GeoServer
attends to fill zero in those pixels in blank area which appears because the
bound of tiff is no longer a rectangle(which is reasonable) and GeoServer makes
the whole thing rectangle.
So what is presented in NDVI result layer is the original tiff and a yellow
edge around the original area, thus make up a whole rectangle. The yellow edge
is those zero-pixels created by GeoServer automatically, and is wrong because
zero is one of the valid value for NDVI anomalies which means the growth is the
same as last couple years, the edge around the original tiff should just be
no-data.
I'm wondering if there's any way to fix this. I understand the shape of tiff is
going to change when retroject from Albers to Web Mercator, and when tiled the
image will be fill-up to a rectangle, but can I just set the area not belong to
the original tiff transparent or -2? and that will be correct presentation of
the result.
Thank you so much for considering and any suggestions.
(btw, i'm sorry if i double posted, because I'm not sure if the previous one is
successfully sent)
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