Re: [mapserver-users] Rendering artefacts when serving raster via WMS * SOLVED * Sort of
Hi After testing with shp2img I have just realised what is causing this problem. It is all my fault :) Some of the map sheets overlap and I am using the OFFSITE command with 255 255 255 to make white transparent, hence some of the sheet behind is showing through. Unfortunately, I need the OFFSITE command to make white transparent so that the white 'border' around the sheet does not obscure the map sheet it is overlapping. I'm not sure what would be the easiest / best way around this. Does anybody have any ideas? Thanks. Regards, John W. Great Britain Historical GIS Project Frank Warmerdam 15/06/11 4:05 PM On 11-06-10 12:25 PM, John Westwood wrote: Does anybody have any ideas what the problem could be? I know it is something to do with the fact that I boosted the images and MapServer doesn't like them, but I would like to fix it. Suggestions greatly appreciated. John, I'm afraid I don't have much to offer. I just wanted you to know that someone had looked at your post and had no bright ideas about why it is happening. If this is quite important to you, you could file a ticket on the issue, reducing it to a simple map file with one input GeoTIFF and a request (ideally with shp2img) that produces the artifacted output. Then I could dig into this from my end. If you do that, you can directly assign the MapServer ticket to warmerdam. Best regards, -- ---+-- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush| Geospatial Programmer for Rent ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
RE: [mapserver-users] Rendering artefacts when serving raster via WMS
Hi Steve Yes, the images are requested as tiles. I should probably try a standard (whole image) request or try shp2img to eliminate that possibility. The requesting software is OpenLayers. The website is using GeoWebCache to cache the tiles, but the test image supplied went directly from MapServer to OpenLayers. I probably won't have time to look at this again until next week. I will keep the list up-to-date with my progress. John Westwood Lime, Steve D (DNR) 15/06/11 4:24 PM From the sample it almost looks like the mapserver.jpg is the result of two images being overlayed either on the server (by mapserver) or in the client. The artifacts look like there's an offset applied to one of them because of the parallel lines. How are the images managed (perhaps as tiles)? Steve -Original Message- From: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Frank Warmerdam Sent: Wednesday, June 15, 2011 10:05 AM To: John Westwood; MAPSERVER-USERS Subject: Re: [mapserver-users] Rendering artefacts when serving raster via WMS On 11-06-10 12:25 PM, John Westwood wrote: Does anybody have any ideas what the problem could be? I know it is something to do with the fact that I boosted the images and MapServer doesn't like them, but I would like to fix it. Suggestions greatly appreciated. John, I'm afraid I don't have much to offer. I just wanted you to know that someone had looked at your post and had no bright ideas about why it is happening. If this is quite important to you, you could file a ticket on the issue, reducing it to a simple map file with one input GeoTIFF and a request (ideally with shp2img) that produces the artifacted output. Then I could dig into this from my end. If you do that, you can directly assign the MapServer ticket to warmerdam. Best regards, -- ---+-- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush| Geospatial Programmer for Rent ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Rendering artefacts when serving raster via WMS
Hi Brent Thanks for the hint. I gave it a try but it did not help. I will have another look at the problem next week. Regards John W. Brent Fraser 15/06/11 4:21 PM John, It looks like a resampling problem. You could try adding PROCESSING OVERSAMPLE_RATIO=1 PROCESSING LOAD_FULL_RES_IMAGE=NO to your layer definition. I had some success with these when trying to get mapserver to render large (and readable) images from OpenStreetMap. Best Regards, Brent Fraser On 6/15/2011 9:04 AM, Frank Warmerdam wrote: On 11-06-10 12:25 PM, John Westwood wrote: Does anybody have any ideas what the problem could be? I know it is something to do with the fact that I boosted the images and MapServer doesn't like them, but I would like to fix it. Suggestions greatly appreciated. John, I'm afraid I don't have much to offer. I just wanted you to know that someone had looked at your post and had no bright ideas about why it is happening. If this is quite important to you, you could file a ticket on the issue, reducing it to a simple map file with one input GeoTIFF and a request (ideally with shp2img) that produces the artifacted output. Then I could dig into this from my end. If you do that, you can directly assign the MapServer ticket to warmerdam. Best regards, ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Rendering artefacts when serving raster via WMS
On 11-06-10 12:25 PM, John Westwood wrote: Does anybody have any ideas what the problem could be? I know it is something to do with the fact that I boosted the images and MapServer doesn't like them, but I would like to fix it. Suggestions greatly appreciated. John, I'm afraid I don't have much to offer. I just wanted you to know that someone had looked at your post and had no bright ideas about why it is happening. If this is quite important to you, you could file a ticket on the issue, reducing it to a simple map file with one input GeoTIFF and a request (ideally with shp2img) that produces the artifacted output. Then I could dig into this from my end. If you do that, you can directly assign the MapServer ticket to warmerdam. Best regards, -- ---+-- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush| Geospatial Programmer for Rent ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Rendering artefacts when serving raster via WMS
John, It looks like a resampling problem. You could try adding PROCESSING OVERSAMPLE_RATIO=1 PROCESSING LOAD_FULL_RES_IMAGE=NO to your layer definition. I had some success with these when trying to get mapserver to render large (and readable) images from OpenStreetMap. Best Regards, Brent Fraser On 6/15/2011 9:04 AM, Frank Warmerdam wrote: On 11-06-10 12:25 PM, John Westwood wrote: Does anybody have any ideas what the problem could be? I know it is something to do with the fact that I boosted the images and MapServer doesn't like them, but I would like to fix it. Suggestions greatly appreciated. John, I'm afraid I don't have much to offer. I just wanted you to know that someone had looked at your post and had no bright ideas about why it is happening. If this is quite important to you, you could file a ticket on the issue, reducing it to a simple map file with one input GeoTIFF and a request (ideally with shp2img) that produces the artifacted output. Then I could dig into this from my end. If you do that, you can directly assign the MapServer ticket to warmerdam. Best regards, ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
