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Raster Files

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Maptitude can display a range of different raster (image) file formats as imagery layers. As well as the conventional bitmap formats of PNG (Portable Network Graphics) and JPEG (Joint Photographers Expert Group), Maptitude supports a range of geospatial image formats:

  • GeoTIFF (geographically registered TIFF image files)
  • ECW (Enhanced Compressed Wavelet)
  • MrSID (Multiresolution Seamless Image Database)
  • USGS digital rectified aerial photographs, including USGS DOQQ format
  • SPOTView and SPOT MetroView satellite imagery

A raster image has to be correctly located on the map using a process is known as registration. This can be tedious, so we recommend you use one of the above geospatial image formats.

A new map can be created from an image file, simply by selecting File->Open and then the image file in question. More usefully, an image file can be added to an existing map by using the Layers dialog box (select Map->Layers on the menu), and then pressing the Add Layer button to add the new image. Alternatively, you can simply drag&drop the image from the Windows File Manager directly into Maptitude:

an imported tile

A single GeoTIFF image that has been imported into Maptitude. (the image is a tile from the UT Bureau of Economic Geology’s NE Digital GAT Quad geological map)

The above example had full image registration information in the form of GeoTIFF header values and a matching TFW file (TIFF World File).

Note the white margins on the tile. These are in the original tile bitmap, and are due to a rotation between projections when the tiles were created. The white should be displayed as transparent, and this can be set using the Styles button on the Layers dialog box.

The image layer can be modified using the Layers dialog box and/or the Display Manager. Note that this process will produce a layer for each image tile that is imported. This can quickly become impractical if your imagery consists of many tiles. Therefore you should use the Image Librarian to manage layers that consist of multiple tiles.

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