[mapserver-users] Very poor WMS tiling performance with small area, ultra-high resolution image

[Stephen Woodbridge]

What is the file format? This has a huge impact on the memory and 
compute tile to extract a random bbox of pixels.

In some formats you have to extract the WHOLE image to grab any subset 
of pixels which could be your problem.

-Steve W

On 2/12/2016 5:28 PM, Avi Blackmore wrote:
> Hello,
>
> We've been using Mapserver as, among other things, a WMS server for some
> time with satellite and aerial imagery, without problems.  We've been
> able to serve imagery of resolutions down to .25 meters without any
> significant performance hit.
>
> Today, we got a sample image from a new source, which has a resolution
> of 0.06 meters.  The image is 317 megabytes in size, and has dimensions
> of 17538 x 19035 pixels.  The file size is smaller than many of the
> Landsat or other images that we have displayed in the past.  However,
> we're finding that rendering this image is extremely expensive.  In
> particular, with tiled access, a la Google Maps, the WMS requests bog
> down our server to the point where all of its memory is consumed.
>
> I know that overviews, tiling, and such, are good strategies for
> reducing the render time on a large area, reasonably high resolution
> image.  But what would be good strategies for improving rendering time
> on this smaller, ultra-high resolution image?
> --
> Avi Blackmore
> Head Programmer/System Administrator
> Satshot Inc.
>
>
>
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>


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