> > 1. I think I know where you’re going with this one, because I thought > I had seen something in my earlier testing but I was unable to confirm it. > I’ve now tested with different datasets that are geographically further > apart. In short, when I make a request to draw in the centre, > approximately, of the raster (specifically the group layer extent) the > problem occurs. When I make a request to draw towards the edge of the > raster the request is successful and the problem does not occur. > > This indicates to me that the "fast path" is indeed having a failure, which we can report. I agree with Andrea - thanks for the detailed testing.
For a workaround to disable fast-path: 1) Looking in RenderedImageMapOutputFormat.java <https://github.com/geoserver/geoserver/blob/master/src/wms/src/main/java/org/geoserver/wms/map/RenderedImageMapOutputFormat.java#L350> // fast path for pure coverage rendering if (DefaultWebMapService.isDirectRasterPathEnabled() && mapContent.layers().size() == 1 && mapContent.getAngle() == 0.0 && (layout == null || layout.isEmpty())) { 2) DefaultWebMapService <https://github.com/geoserver/geoserver/blob/master/src/wms/src/main/java/org/geoserver/wms/DefaultWebMapService.java#L215> public static boolean isDirectRasterPathEnabled() { return !BYPASS_DIRECT; } defined by: /** This variable is used to bypass direct raster rendering. */ private static boolean BYPASS_DIRECT = Boolean.getBoolean("org.geoserver.render.raster.direct.disable"); So if you can try starting up with -Dorg.geoserver.render.raster.direct.disable=true it should act as a workaround. > 1. I tried looking into setting up an alpha mask (1 bit) vs band (8 > bit). I couldn’t work out how to do it. If you think it’s a useful test to > do still, can you please provide some guidance and I’ll happily do it? > You’ll see in the gdalinfo below that the alpha band is 8 bit now. > > Yeah I am not the best at that part either :) There are several ways to define transparency - I would report the issue as is, and then try each method to seek a work around or to learn more. Kind regards, > > James > Cheers, Jody
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