Hi, I have some general questions regarding overviews and performance in mapserver. I've been going through the past user lists and it seems the general consensus it that creating sets of images (small tiles to large merged tiles) at different cell resolutions (reduced resolution as you zoom out) that are activated by the MIN MAX Scale definitions in the mapfile is the optimal why to go. I was wondering is it still beneficial to create internal overviews for these images using tool like gdaladdo. I've been doing some testing and don't see much of a change between aggregate images and aggregate images with overview. I was also hoping someone could shed some light around at what scale internal overviews are activated. For instance our data is 0.20m pixel size 1 km square tiles and I run gdaladdo on it
gdaladdo -r average image_1.tif 2 4 8 16 32 Right now its my understanding that the first level creates a resampled internal image that is half the resolution 0.4m and second level would resample the image to 0.8m resolution and so on. If I'm zoomed all the way in 1:1 and begin zooming out at what mapscale is the first overview level activated. Travis Kirstine First Base Solutions Limited 140 Renfrew Dr, Suite 100 Markham ON L3R 6B3 Phone 905.477.3600 Fax 905.477.3882 [EMAIL PROTECTED]
