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Requirement (Problem)

You have 1000's of raster images and you want to create a single mosaic (a complete stitched map) of those images.

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Courtesy of QGIS documentation for OGC Client support

Image courtesy of Stack Exchange

Example

A customer had over 3800 ECW images of their area which needed to be viewed at a variety of scales.  The key difference here is the need to view at different scales - if that requirement isn't needed then a simple Raster Tile Index can be built. 

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	LAYER 
		NAME "aerial1999"
		STATUS DEFAULT
		TYPE RASTER
		METADATA
		  "wms_title" 			"Aerial Photography 1999-2000"
		  "wms_srs"             "EPSG:27700"
		  "wms_name"            "aerial1999"
		  "wms_server_version"  "1.1.1"
		  "wms_format"          "image/png"
		END
		DATA "Raster\Aerial_Photographs_1999-2000\_all_ecw.vrt"
	END

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