GBDX

ENVI® Generate GCPs From Tie Points

This task generates two sets of ground control points (GCPs) from tie points. The geographic locations of the GCPs are calculated from the first raster. The elevation values of the GCPs are calculated from the DEM raster.

GBDX Registered Name: ENVI_GenerateGCPsFromTiePoints
Provider: Harris Geospatial Solutions

Inputs

The following table lists all ENVI_GenerateGCPsFromTiePoints 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[*]
dem_is_height_above_ellipsoid False false string Set this property to true if the DEM is already expressed as the height above the ellipsoid and no geoid correction is required. -- Value Type: BOOLEAN -- Default Value: false
output_gcps2_uri_filename False N/A string Specify a string with the fully-qualified path and filename for OUTPUT_GCPS2. -- Value Type: STRING
input_dem_raster False N/A See ENVIRASTER input type Specify a digital elevation model (DEM) raster. The elevation values of GCPs are calculated using the DEM raster. If you do not have a DEM file readily available, you can use the global DEM named GMTED2010.jp2 that is provided with your ENVI installation under the Exelis/envixx/data folder. The Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010) dataset has a mean resolution of 30 arc seconds. -- Value Type: ENVIRASTER
input_dem_raster_filename False N/A string Provide the explicit relative raster filename that ENVI will open. This overrides any file lookup in the task runner. -- Value Type: STRING
input_tiepoints True N/A See ENVITIEPOINTSET input type This is a reference to an input ENVITiePointSet object. -- Value Type: ENVITIEPOINTSET
output_gcps1_uri_filename False N/A string Specify a string with the fully-qualified path and filename for OUTPUT_GCPS1. -- Value Type: STRING

Outputs

The following table lists all ENVI_GenerateGCPsFromTiePoints 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_gcps2_uri True N/A directory Output for OUTPUT_GCPS2. -- Value Type: ENVIURI
output_gcps1_uri True N/A directory Output for OUTPUT_GCPS1. -- Value Type: ENVIURI

Output structure

The output_gcps2_uri file will be written to the specified S3 Customer Account Location.The output_gcps1_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® Generate GCPs From Tie Points.

Contact

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

ENVI® Generate GCPs From Tie Points

This task generates two sets of ground control points (GCPs) from tie points. The geographic locations of the GCPs are calculated from the first raster. The elevation values of the GCPs are calculated from the DEM raster.

GBDX Registered Name: ENVI_GenerateGCPsFromTiePoints
Provider: Harris Geospatial Solutions