Hi<br><br>[Apols for the X-post]<br><br>I'm trying to reproject a set of rasters in order to improve performance on my application.<br><br>I have a set of rasters in OSGB (EPSG:27700) that I want to pre-process so that they are in WGS84 (EPSG:4326) within GeoServer, rather than relying on GeoServer to do the reprojection on the fly.<br>
<br>I have been reprojecting the rasters using the following command<br><br><br>gdalwarp -of GTiff -s_srs "EPSG:27700" -t_srs "EPSG:4326" -co "TILED=YES" -co "COMPRESS=LZW" -co "TFW=YES" OLDNAME.TIF NEWNAME.TIF<br>
<br><br>I have used the ImageMosaic datastore to load these into GeoServer and can view them. So far, so good.<br><br>However, there seems to be large gaps between the 'tiles' so that roads no longer join up and forests have big white gaps within them.<br>
<br>From checking the rasters and the resultant world files, I've noticed a few things.<br><br>1) The image sizes are not constant. All of my original tiles are the same size. It has raised an interesting question of whether the meridian line runs parallel to an OSGB Y-axis.<br>
2) The worldfiles also contain some curious values. I understand that the 1st and 4th parameters in a worldfile are the real world distance of a single pixel, but they seem to have the same value in despite the fact that the image size changes from being square to being rectangular.<br>
<br>Whether those things mean anything, or are perfectly legitimate when reprojecting, I don't know, I just thought I should mention them.<br><br>Has anybody got any advice on how to reproject a full set of rasters, or what I have done wrong?<br>
<br>Thanks<br><br>Rob<br>