FLT format provides ESRI ArcINFO Floating-Point Grid raster data in .flt files.    FLT files normally provide projection information, often in an accompanying .prj file, so when an image is imported by Manifold from FLT format it will be correctly georegistered.   When exporting, .prj and .mapmeta files are written.  Only single-channel images can be exported.  See the Exporting topic.



To import from FLT format:


  1. Choose File-Import from the main menu.

  2. In the Import dialog browse to the folder containing data of interest.

  3. Double-click the file ending in .flt for the data of interest.

  4. A table and image will be created.




We can double-click on images that are created to view them.   For a more interesting display, we first create a new data source using a Bing street maps image server as shown in the Example: An Imageserver Tutorial topic.   We then create a map and drag and drop the Bing layer into the map, and then we drag and drop the image into the map.



The terrain image appears dark, since it has not yet had a palette applied.  We use the Style pane to color the image using a palette.   We also add hill shading.



The result is a much more understandable display of the terrain elevation data.



Zooming in we see the FLT file has provided reasonably detailed data for the region.   In the illustration above, we have added a transparent streets Google image server layer above the florida image layer, to provide better context.  


The florida terrain elevation data set shows the Lake Wales Ridge region of slightly higher terrain in Florida.  It is used in many examples and illustrations in this documentation, with detailed examples of palettes in the Style: Autocontrast and Style: Palettes topics.


Z exports - Exporting will apply Z offset / scale values to pixels.


See Also







Style: Autocontrast


Style: Palettes




Example: Spectacular Images and Data from Web Servers