[mapserver-users] How do I configure Mapfile to use image pyramids

[Brent Fraser]

Mike:

  Two ways:

1. External Overview Pyramid
	- see http://mapserver.org/input/raster.html#rasters-and-tile-indexing and
	      http://mapserver.org/input/raster.html#raster-display-performance-tips
	- Make image pyramid levels with gdal_translate
	- create tile indexes for each level of pyramid with gdaltindex
	- add one LAYER entry in your map file for each level of your pyramid (and 
carefully select a MIN/MAXSCALEDENOM for each)

or

2. Internal Overviews
	- create a GDAL VRT file with gdalbuildvrt
	- create image overviews with gdaladdo
	- add only one LAYER to your map file referencing the VRT file (and let GDAL 
figure out the pyramids)

I haven't tried the second approach but it sounds interesting.

Best Regards,
Brent Fraser

Mike Quentel wrote:
> I meant gdaladdo for the pyramids (of GeoTIFF).
> 
>  
> 
> Mike Quentel
> 
>  
> 
>  
> 
> *From:* mapserver-users-bounces at lists.osgeo.org 
> [mailto:mapserver-users-bounces at lists.osgeo.org] *On Behalf Of *Mike Quentel
> *Sent:* 18 August 2010 11:45
> *To:* MapServer Users
> *Subject:* [mapserver-users] How do I configure Mapfile to use image 
> pyramids
> 
>  
> 
> How do I configure the Mapfile to point to image pyramids?  Does 
> Mapserver automagically recognise pyramids?  Do I simply generate my 
> pyramids of GeoTIFF images using gdal_translate, then point to a tile 
> index in the Mapfile?
> 
>  
> 
> Sorry if this is the Nth time someone has asked this question, but 
> oddly, it does not explicitly appear anywhere obvious on the web site, 
> nor in the manual.  If so, please point it out (eg: “you can find the 
> information about using pyramids on page # of the manual, or at this 
> link ____”).  I have tried doing a search for the term “pyramid” in the 
> manual; nothing returned.  Wish there were a chapter subheading under 
> Data Input-->Raster Data--> “Using Pyramids”.
> 
>  
> 
> Many thanks.
> 
>  
> 
> Mike Quentel
> 
>  
> 
>  
> 
> 
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