GBDX

ENVI® Local Sigma Adaptive Filter

This task applies a Local Sigma adaptive filter to a raster, to preserve fine detail (even in low contrast areas) and to reduce speckle significantly.

GBDX Registered Name: ENVI_LocalSigmaAdaptiveFilter
Provider: Harris Geospatial Solutions

Inputs

The following table lists all ENVI_LocalSigmaAdaptiveFilter 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 Local Sigma adaptive filtering. -- 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
noise_standard_deviations False 1.0 string Specify the number of standard deviations used to determine valid pixels within the filter window. The default value is 1.0. ENVI determines which pixels are valid by calculating a minimum and maximum pixel value based on the number of standard deviations and the local statistics. It replaces the pixel being filtered with the mean calculated using only the valid pixels within the filter box. -- Value Type: DOUBLE -- Default Value: 1.0
window_size False 3 string Specify a square filtering window size. -- Value Type: UINT -- Default Value: 3
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_LocalSigmaAdaptiveFilter 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® Local Sigma Adaptive Filter.

Contact

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

ENVI® Local Sigma Adaptive Filter

This task applies a Local Sigma adaptive filter to a raster, to preserve fine detail (even in low contrast areas) and to reduce speckle significantly.

GBDX Registered Name: ENVI_LocalSigmaAdaptiveFilter
Provider: Harris Geospatial Solutions