[OSGeo-Discuss] fastest option of serving huge imagery on web mapon the fly

[Bob Basques]

All, 

We went through this same exercise a few years back, and in the end just opted for Jpegs in a pyramid tile set behind the scenes with MapServer as the assembly service.  We had specific needs of being able to assemble seamless images from the aerials in any size and paid a lot of attention to dropping pixels vs adding them with Mapserver (one process is faster than the other). 

This setup has been serving us well for years. 

GUI interface (public version) is here: 

     http://gis.ci.stpaul.mn.us/gis/gismo_public/html/ 

Try one of the default 5 layers in the Backgrounds folder. 

Here is a direct link to one of them: 
    http://gis.ci.stpaul.mn.us/datasets/RASTER/SAINT_PAUL/PUBLIC_WORKS/AERIAL_CITIPIX/citipix_2001_public.map?mapext=572170.3096850861%20154364.2202090687%20574347.789661319%20157490.94035167122&mapsize=679%20975&mode=map ( http://gis.ci.stpaul.mn.us/datasets/RASTER/SAINT_PAUL/PUBLIC_WORKS/AERIAL_CITIPIX/citipix_2001_public.map?mapext=572170.3096850861%20154364.2202090687%20574347.789661319%20157490.94035167122&mapsize=679%20975&mode=map ) 

Our outside network is the slow part of the process.  Internally, the last link above takes 918ms to load in a browser. 

Here's a bigger one: 

http://gis.ci.stpaul.mn.us/datasets/RASTER/SAINT_PAUL/PUBLIC_WORKS/AERIAL_CITIPIX/citipix_2001_public.map?mapext=570924.4319667261%20154282.44445149295%20575593.667379679%20157572.71610924698&mapsize=1456%201026&mode=map ( http://gis.ci.stpaul.mn.us/datasets/RASTER/SAINT_PAUL/PUBLIC_WORKS/AERIAL_CITIPIX/citipix_2001_public.map?mapext=570924.4319667261%20154282.44445149295%20575593.667379679%20157572.71610924698&mapsize=1456%201026&mode=map ) 
(1.56s) 

and a still bigger one: 

http://gis.ci.stpaul.mn.us/datasets/RASTER/SAINT_PAUL/PUBLIC_WORKS/AERIAL_CITIPIX/citipix_2001_public.map?mapext=569231.1927510398%20153621.824605979%20577286.9065953654%20158233.33595476093&mapsize=2512%201438&mode=map ( http://gis.ci.stpaul.mn.us/datasets/RASTER/SAINT_PAUL/PUBLIC_WORKS/AERIAL_CITIPIX/citipix_2001_public.map?mapext=569231.1927510398%20153621.824605979%20577286.9065953654%20158233.33595476093&mapsize=2512%201438&mode=map ) 
(4.56s) 

I also have them in WMS if you like. 

What type of performance levels are you looking for?  The above is running on some now outdated hardware as well. 

bobb 





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