[mapserver-users] performance problem with ortho images

[Liang Jian]

Hi all,

I have a problem with mapserver handling ortho images. The situation is we have 2m data cover the whole country and 20-50cm data cover most cities. We setup mapfiles as 2m data shows between scale 200k to 500 and 20-50cm data show between scale 100k to 500. Problem is when requirst data in the city ranges, mapserver first read data from 20-50cm dataset and then read from 2m dataset which is unnecessary as the 20-50cm data is enough and the best solution is when there is no 20-50cm data, 2m data should be used instead.

Do you have any idea how to avoid the unnecessary reading?

Any suggestions will be welcome!

Thanks

/Liang

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