GBDX

ENVI® Equalization Stretch Raster

This task accepts a source raster and returns a raster with a histogram equalization stretch applied. This type of stretch scales the data to have the same number of digital numbers (DNs) in each display histogram bin.

GBDX Registered Name: ENVI_EqualizationStretchRaster
Provider: Harris Geospatial Solutions

Inputs

The following table lists all ENVI_EqualizationStretchRaster 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 apply the stretch. -- 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
brightness False N/A string Specify an integer value from 0 to 100, indicating the brightness level to display. If the array has one value, it applies to all bands, otherwise it must have the same number of elements as the input raster has bands. -- Value Type: DOUBLEARRAY
max True N/A string Specify the maximum value to be considered, also known as the white point. If the array has one value, it applies to all bands, otherwise it must have the same number of elements as the input raster has bands. -- Value Type: DOUBLEARRAY
min True N/A string Specify the minimum value to be considered, also known as the black point. If the array has one value, it applies to all bands, otherwise it must have the same number of elements as the input raster has 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

Outputs

The following table lists all ENVI_EqualizationStretchRaster 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® Equalization Stretch Raster.

Contact

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

ENVI® Equalization Stretch Raster

This task accepts a source raster and returns a raster with a histogram equalization stretch applied. This type of stretch scales the data to have the same number of digital numbers (DNs) in each display histogram bin.

GBDX Registered Name: ENVI_EqualizationStretchRaster
Provider: Harris Geospatial Solutions