--- Intengu Technologies <[EMAIL PROTECTED]> wrote: > Hello > > I understand that most experts are saying it is far better not to load > images in a database but rather to serve them from a file based system. > There are two commercial products that I know of ER Mapper - Image Web > Server and ArcGIS Image Server what OSS products provide comparable > functionalities. If these are available are there any bench mark studies > done and also I would like to integrate such products with ArcGIS Server.
As I understand it, these applications are only for georeferenced images, ie, images covering a defined area of the planet. So in PostGIS you'd not only need to store teh image, but also the georeferncing informnation (eg, the world file contents). I'm not sure if you are referring to just these types of images (typically geotiffs, MrSID composites, or other formats with world files) or other types of images. At NIWA (where I work) we are using a package called Atlas (www.atlasmd.com). This is a commercial digital asset management application. We partially funded the Atlas port to PostGIS and the development of a mapserver based interface to enable searches for images with a known location (lat/long) associated with them. The application manages images as files, with all relevant metadata in PostGIS. We are very pleased with the functionality it offers. The images are optionally associated with a location, but are not georeferenced. We had severe performance issues with the Windows server running Atlas also running the mapserver, but addressed this by abstracting the background map data to a remote Linux (or BSD) server providing the maps via WMS, with the Atlas server overlaying image locations on the WMS background. This proved much faster and easier to manage. We are also using the separate WMS server in a similar role to support other applications. If anyone is interested, contact me or the atlas developers from their web site, listed above. As I mentioned, Atlas itself is a commercial application, but utilises FOSS GIS programs. Cheers, Brent Wood _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
