I was just in a conversation with a friend of mine - I found that he's been wrestling with some homebrew code for managing large aerial photos - and the usual issues of performance, memory management, caching, and multiresolution data came up. A number of useful resources in the Open Source community are available in that arena, and I thought I would share some of them:
OSSIM - Open Source Software Image Map
From the OSSIM site:
OSSIM is a high performance software system for remote sensing, image processing, geographical information systems and photogrammetry. It is an open source software project maintained at http://www.ossim.org/ and has been under active development since 1996. The lead developers for the project have years of experience in commercial and government remote sensing systems and applications.
OSSIM has been funded by several US government agencies in the intelligence and defense community and the technology is currently deployed in research and operational sites. The name OSSIM is a contrived acronym (Open Source Software Image Map) that is pronounced “awesome” – the acronym was established by our first government customer.
Another interesting effort ongoing is the Open Aerial Map project, spearheaded by the prodigiously prolific MetaCarta map ninja and OpenLayers/TileCache developer Christopher Schmidt:
OAM - Open Aerial Map
From the OAM site:
This project is an attempt to gather data from various free and open aerial imagery datasources around the world, and use them to create a single, coherent open world view.
If you are interested in seeing your data here, please email crschmidt@crschmidt.net.
Both of these sites contain code repositories, documentation, and other community resources are available, such as IRC chat channels.
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