1) I use average as well. No problems or complaints so far. 2) I use uncompressed TIFs when I can and not worry about file sizes unless necessary. If compression is necessary, I use LZW first, then JPEG (75 - 90) if more compression is needed. They all work fine.
3) Also have never heard of those processing directives. - John On Tue, May 29, 2012 at 10:43 AM, Rahkonen Jukka <[email protected]>wrote: > ** > Hi, > > 1) I am using average and our users have not complaint. But it is simple > to test, you can create external overviews with -ro switch and try all the > alternatives within on hour or faster. It will be nice to read about your > experience. Take some timings too. > > 2) Jpeg in tiff suits pretty well for Mapserver, both for the images and > overviews. > > 3) Never heard about such processing directives, need to test some day. > > -Jukka Rahkonen- > > > ------------------------------ > *Lähettäjä:* [email protected] [mailto: > [email protected]] *Puolesta *Mark Volz > *Lähetetty:* 29. toukokuuta 2012 17:18 > *Vastaanottaja:* [email protected] > *Aihe:* [mapserver-users] optimize raster for mapserver - gdal geoTIFF > source > > Hello, > > I added a GeoTIFF to one of my .map files. When zoomed in the image > appears fine. When I zoom out the image appears grainy, especially when > looking at dirt fields. I assume the problem is that I built the overviews > with the wrong resampling method when I built overviews with gdaladdo. > > Question 1) Does anyone have any recommendations for resampling air > photos when I create an image using gdal? *{nearest > (default),average,gauss,cubic,average_mp,average_magphase,mode}* > > Question 2) I am using a compressed geoTIFF with built in overviews. I am > happy with this format as the file size is small, and the speed is fast. I > am wondering if this is format for having a fast raster while keeping a > relatively small file. Does anyone else have any other suggestions? > > Question 3) I have seen several Mapserver snippets of code concerning > GDAL_FORCE_CACHING and GDAL_ONE_BIGREAD. If I am not reprojecting my > imagery which processing directive(s) would be better for a compressed > GeoTIFF with overviews? > > > LAYER > … > PROCESSING "GDAL_FORCE_CACHING = YES" > Or: > PROCESSING "GDAL_ONE_BIGREAD = YES" > … > END # Air Photo Layer > > > Thank You > > Mark Volz > GIS Specialist > > > > > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users > >
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