Feature Extraction


The Feature Extraction tool provides algorithms to compute different types of features for Polygons, Cells and Rasters. Three kinds of features are available: A detailed description of the available features can be accessed in the GeoDMA web site.

Using the interface

It is accessed through:

GeoDMA > (...) Feature Extraction In the Spectral and Spatial Features tab:
  1. In the Kind of Features group, check Spectral check box to compute Spectral Features and/or Spatial check box to compute Spatial Features. NOTE: To compute Spectral Features it is MANDATORY to have one Polygon Layer and one Raster Layer. To compute Spatial Features, it needs only one Polygon Layer. Both kinds of features can either be computed simultaneously.
  2. Raster Layer: select the Raster layer to be used to compute the Spectral Features.
  3. Vector Layer: Select the Vector layer to be used to compute the Spectral and/or Spatial Features.
  4. In the Raster Bands group, select the bands to be used to compute the Spectral Features.
  5. No data output value (Optional): define here the no data value. It will be used when invalid polygons are found or when the polygon does not intersects the raster.
  6. Repository: define the repository to save the classification. Click  (...) to save into an ESRI Shape File or (...) to save into a database. If you want to save in the same input layer, you don't need to select a repository here. Just don't change the output layer name.
  7. Layer Name:  define the name of the layer where the classification data will be saved. If you want to save in the same input layer, just don't change the name here. Otherwise, set here the name of the new layer to be created.
  8. CSV File (Optional): Define an output CSV file if you want to save in this format. Click (...) to select the output CSV file.
  9. Click OK to perform the operation or Cancel to close the interface.
In the Landscape Ecology tab:
  1. Patches Vector: select the classified vector layer containing the classified patches to compute the Landscape Ecology based features.
  2. Classes Column: select the column of the Patches Vector that contains the labels of the classes of the Patches Polygons.
  3. Landscape Vector: select the Vector Layer containing the Landscape Polygons, i. e., the target polygons where the features will be saved.
  4. No data output value (Optional): define here the no data value. It will be used when invalid polygons are found.
  5. Repository: define the repository to save the classification. Click  (...) to save into an ESRI Shape File or (...) to save into a database. If you want to save in the same input layer, you don't need to select a repository here. Just don't change the output layer name.
  6. Layer Name:  define the name of the layer where the classification data will be saved. If you want to save in the same input layer, just don't change the name here. Otherwise, set here the name of the new layer to be created.
  7. CSV File (Optional): Define an output CSV file if you want to save in this format. Click (...) to select the output CSV file.
  8. Click OK to perform the operation or Cancel to close the interface.