[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
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Re: [mapserver-users] optimize raster for mapserver - gdal geoTIFF source
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: mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] Puolesta Mark Volz
Lähetetty: 29. toukokuuta 2012 17:18
Vastaanottaja: mapserver-users@lists.osgeo.org
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
mapserver-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] optimize raster for mapserver - gdal geoTIFF source
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
jukka.rahko...@mmmtike.fiwrote:
**
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:* mapserver-users-boun...@lists.osgeo.org [mailto:
mapserver-users-boun...@lists.osgeo.org] *Puolesta *Mark Volz
*Lähetetty:* 29. toukokuuta 2012 17:18
*Vastaanottaja:* mapserver-users@lists.osgeo.org
*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
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