In addition to the output tiles, the Mosaic Generation module can, as an option, generate source maps for each output tile. These maps are vector-polygon files that provide a list of the source images that make up each pixel in the output mosaic tiles.
You can review the output source maps in CATALYST Professional Focus.
To view output source maps in Focus
- On the File menu, click Open.
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In the File Selector window, open the Mosaic/SourceMap folder, select all of the source-map files, and then click Open.
The following figure shows a sample mosaic with all of the generated source maps open.
Each source-map file covers the extent of the tile that it references. By reviewing the attribute table for a particular polygon, you can view the source image for that polygon in its respective mosaic tile.
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On the Maps tab, right-click a source map, and then click Attribute Manager.
The Attribute Manager window appears for the selected source map. For example, the following figure shows the source-map file for SPOT4_1_1.pix.
- On the Editing toolbar, click the arrow beside Selection Tools, and then click the tool you want.
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In the source map, select a shape (representing a block of pixels originating from a source image).
The selected shape is highlighted in the Attribute Manager window, as shown in the following figure. The Attribute Manager window also displays the name of the file from which the block of pixels originated, and the order in which it was added to the mosaic.
Your mosaic image is now complete. If necessary, you can update your mosaic with new imagery by using the Mosaic Update Generation module.