Autodesk 15606-011408-9320 User Guide - Page 100

Generating Raster Image Catalog Files The simplest way to generate raster image catalog (RIC) files is to use Autodesk MapGuide Raster Workshop, a utility available from the Autodesk MapGuide Author CD. You can use this utility to create a RIC, add raster image files to it, sub-sample and merge the files, and more. You can also generate RICs manually by using an ASCII text editor or by exporting the data in CSV format from a database. However, in many cases the extents of the raster image file may not be readily available. For example, ESRI world files use the coordinates of one corner and the width of each pixel. You would have to open the image itself to determine how many pixels it contained, and then calculate the extents for each image. Another way to generate a RIC manually is to use Autodesk MapGuide Author to obtain the coordinates of the image extents. First, display each image on a layer, and then zoom to opposite corners of the image (lower-left and upper-right), reading the coordinates from the status bar. These coordinates indicate the extents of the image. They do not have to be exact, only greater than the extents of the actual image. The extents in the RIC are used only to determine if an image might be visible. The georeferencing information from each image will be used to georeference the image within the tiled suite. Georeference File Formats A georeference file indicates how to place a raster image on a map. Autodesk MapGuide Author supports four georeference file formats: ESRI world files, MapInfo tab files, GeoTIFF files, and header files. ESRI World File An ESRI world file is an ASCII text file that uses the following format: Format Example 2.0 0.0 0.0 100 | Chapter 5 Working with Data in Autodesk MapGuide