GRASS

Format for the "Geographic Resources Analysis Support System" (GRASS) raster-oriented package, originally developed by the US Army Corps of Engineers, and still surviving as open source after being abandoned by the Army in 1992 and being taken over first by a team at Baylor University and, more recently, OSGEO.   The Manifold GRASS dataport reads raster data from GRASS.  

 

GRASS files typically come in hierarchies of folders containing many constituent files, where the location of various files within the hierarchy has meaning for the original project when opened in GRASS.   It can be a major challenge for people who are not in the GRASS subculture to figure out what files contain data of interest.

 

dlg_import_grass.png

 

To import from GRASS format:

 

  1. Choose File-Import from the main menu.

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

  3. Choose . Files (GRASS) (*.*) in the file type box.

  4. Double-click the file for the data of interest.

  5. A table and image will be created.

 

 

eg_import_grass01_01.png

 

We can double-click on an image to view it.

 

eg_import_grass01_02.png

 

GRASS can work with raster images in a very wide variety of formats.  Opening an image may require significant tinkering with Style settings, such as utilizing Full Range on channel values, to create a visually meaningful image.   For example, the elevation image opened above consists of a single channel that seems to give the elevation value for each pixel.

 

eg_import_grass01_03.png

 

We can color the raster image using a palette, and apply hill shading to provide a better, more visually understandable image.

 

See Also

Style

 

Maps

 

Images

 

DEM

 

GLOBE

 

Example: Spectacular Images and Data from Web Servers