ENVI® Dark Subtraction Correction

This task performs a simple atmospheric correction by subtracting a user-specified digital number (DN) from each band.

GBDX Registered Name: ENVI_DarkSubtractionCorrection
Provider: Harris Geospatial Solutions

The following table lists all ENVI_DarkSubtractionCorrection 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 a raster on which to perform dark subtraction correction. -- 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
input_raster_raw_output	False	False	See ENVIRASTER input type	Provide True to output an ENVI Binary instead of a tif. -- Value Type: STRING
values	True	N/A	string	Specify a DN value or array of DN values to subtract from each band. The number of elements in the array must match the number of bands. -- 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

The following table lists all ENVI_DarkSubtractionCorrection 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.

For additional background information on this task please refer to the Harris Geospatial ENVI documentation and
ENVI® Dark Subtraction Correction.

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

GBDX