[mapserver-users] optimize raster for mapserver - gdal geoTIFF source

[John Callahan]

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.Rahkonen at mmmtike.fi>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:* mapserver-users-bounces at lists.osgeo.org [mailto:
> mapserver-users-bounces at lists.osgeo.org] *Puolesta *Mark Volz
> *Lähetetty:* 29. toukokuuta 2012 17:18
> *Vastaanottaja:* mapserver-users at 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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>
>
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