Autodesk 15606-011408-9330 User Guide - Page 103
Raster Image Catalog Files
UPC - 606121429609
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Raster Image Catalog Files In addition to individual raster image files, Autodesk MapGuide supports Raster Image Catalog (RIC) files. A RIC is a list of raster image files and their lower-left and upper-right coordinates. When creating a raster map layer, you can reference an individual raster image in any of the supported formats shown on page 101, or in a RIC file. Each raster image file (whether an individual image or a RIC) must be accompanied by a georeferencing file, which provides additional information about how to position the raster image on the map. Note that GeoTIFF files do not require a separate georeferencing file. Raster images in ECW and MrSID format are already optimized, so there is no reason to include them in RIC files. When you access a layer that references a RIC file, Autodesk MapGuide Server scans through the RIC file to determine the images or portions of images that correspond to the area being viewed, and then sends only the data for that area. This greatly increases performance, as only the necessary data is stored in memory instead of the entire image. It is important to keep in mind that the RIC file only determines which images might be visible. Georeferencing information for each individual raster image must still be available, as this information-not the information in the RIC file-is used to place them in the correct position on the map. Note that the raster image must be based on the same coordinate system as the rest of the data on the map, and it cannot be converted automatically if you change the coordinate system for the map. If Autodesk MapGuide Server is running under the System account, please note the following: All of the image files in the RIC must be on the same server as the RIC. The RIC must reference the raster image files using relative paths. If you use a computer name in the path, Windows NT/2000 will not be able to recognize it. Raster Image Catalog File Format Raster image catalog files are ASCII, comma-delimited (CSV) files with the following format: "",,,, "",,,, "",,,, ... "",,,, Working with Raster Images | 103