GBDX

ENVI® Raster Viewshed

This task calculates a viewshed analysis, which is the process of identifying locations that are visible from one or more view points. These view (or observer) points are often constrained by variables such as height, horizontal and vertical field of view (FOV), azimuth, and pitch.

GBDX Registered Name: ENVI_RasterViewshed
Provider: Harris Geospatial Solutions

Inputs

The following table lists all ENVI_RasterViewshed inputs.
Mandatory (optional) settings are listed as Required = True (Required = False).

Name Required Default Valid Values Description
file_types False N/A string GBDX Option. Comma seperated list of permitted file type extensions. Use this to filter input files -- Value Type: STRING[*]
input_raster True N/A See ENVIRASTER input type Specify an elevation raster to be used for calculating the viewshed. -- Value Type: ENVIRASTER
input_raster_format False N/A See ENVIRASTER input type Provide the format of the image, for example: landsat-8. -- Value Type: STRING
input_raster_band_grouping False N/A See ENVIRASTER input type Provide the name of the band grouping to be used in the task, ie - panchromatic. -- Value Type: STRING
input_raster_filename False N/A See ENVIRASTER input type Provide the explicit relative raster filename that ENVI will open. This overrides any file lookup in the task runner. -- Value Type: STRING
vertical_field_of_view False [180.0] string Specify the angle (in degrees) of the vertical range per observer point. -- Value Type: DOUBLEARRAY -- Default Value: [180.0]
combination False "union" string Specify how multiple viewsheds should be combined. -- Value Type: STRING -- Default Value: "Union"
horizontal_field_of_view False [360.0] string Specify the angle (in degrees) of the horizontal range per observer point. -- Value Type: DOUBLEARRAY -- Default Value: [360.0]
pitch False [0.0] string Specify the verticle pointing angle (in degrees) of the observer point's line of sight. A positive pitch value is above the horizon, and a negative pitch value is below the horizon. -- Value Type: DOUBLEARRAY -- Default Value: [0.0]
height True N/A string Specify the view height in meters above the surface. -- Value Type: DOUBLEARRAY
range True N/A string Specify the range in meters out to which a viewshed will be calculated. -- Value Type: DOUBLEARRAY
azimuth False [0.0] string Specify the angle (in degrees) clockwise from North from per observer point. -- Value Type: DOUBLEARRAY -- Default Value: [0.0]
pixel_location True N/A string Specify the row, column in the elevation raster that represents the view point. -- Value Type: DOUBLEARRAY
output_raster_uri_filename False N/A string Specify a string with the fully-qualified path and filename for OUTPUT_RASTER. -- Value Type: STRING

Outputs

The following table lists all ENVI_RasterViewshed outputs.
Mandatory (optional) settings are listed as Required = True (Required = False).

Name Required Default Valid Values Description
task_meta_data False N/A directory GBDX Option. Output location for task meta data such as execution log and output JSON
output_raster_uri True N/A directory Output for OUTPUT_RASTER. -- Value Type: ENVIURI

Output structure

The output_raster_uri file will be written to the specified S3 Customer Account Location.

Background

For additional background information on this task please refer to the Harris Geospatial ENVI documentation and
ENVI® Raster Viewshed.

Contact

If you have any questions or issues with this task, please contact gbdx-support@digitalglobe.com.

ENVI® Raster Viewshed

This task calculates a viewshed analysis, which is the process of identifying locations that are visible from one or more view points. These view (or observer) points are often constrained by variables such as height, horizontal and vertical field of view (FOV), azimuth, and pitch.

GBDX Registered Name: ENVI_RasterViewshed
Provider: Harris Geospatial Solutions