GBDX

ENVI® Raster Statistics

This task computes statistics on a raster.

GBDX Registered Name: ENVI_RasterStatistics
Provider: Harris Geospatial Solutions

Quickstart

This is a workflow example for basic processing.

Python

# Initialize the Environment.
from gbdxtools import Interface
gbdx = Interface()

tasks = []
output_location = 'ENVI/RasterStatistics'

cat_id = '103001005A9A9400'

# Image Auto ordering task parameters
order = gbdx.Task("Auto_Ordering")
order.inputs.cat_id = cat_id
order.impersonation_allowed = True
order.persist = True
order.timeout = 36000
tasks += [order]

# Image AOP task parameters
aop = gbdx.Task("AOP_Strip_Processor")
aop.inputs.data = order.outputs.s3_location.value
aop.inputs.bands = 'MS'
aop.inputs.enable_dra = False
aop.outputs.data.persist = True
aop.outputs.data.persist_location = output_location+'/aop'
aop.timeout = 36000
tasks += [aop]

envi_raster_stats = gbdx.Task("ENVI_RasterStatistics")
envi_raster_stats.inputs.input_raster = aop.outputs.data.value
envi_raster_stats.inputs.compute_covariance = True
tasks += [envi_raster_stats]

workflow = gbdx.Workflow(tasks)
workflow.savedata(envi_raster_stats.outputs.task_meta_data, location=output_location)
workflow.savedata(envi_raster_stats.outputs.eigenvectors, location=output_location)
workflow.savedata(envi_raster_stats.outputs.min, location=output_location)
workflow.savedata(envi_raster_stats.outputs.max, location=output_location)
workflow.savedata(envi_raster_stats.outputs.npixels, location=output_location)
workflow.savedata(envi_raster_stats.outputs.correlation, location=output_location)
workflow.savedata(envi_raster_stats.outputs.covariance, location=output_location)
workflow.savedata(envi_raster_stats.outputs.stddev, location=output_location)
workflow.savedata(envi_raster_stats.outputs.eigenvalues, location=output_location)
workflow.savedata(envi_raster_stats.outputs.mean, location=output_location)

workflow.execute()

Inputs

The following table lists all ENVI_RasterStatistics 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 from which to generate statistics. -- 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
compute_covariance False false string Set this property to true to compute covariance matrix, eigenvectors, eigenvalues, and correlation on the raster. The options are true or false (default). -- Value Type: BOOLEAN -- Default Value: false

Outputs

The following table lists all ENVI_RasterStatistics 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
eigenvectors True N/A string This is the eigenvectors of the data. -- Value Type: DOUBLEARRAY
min True N/A string This is the minimum data value of each band. -- Value Type: DOUBLEARRAY
max True N/A string This is the maximum data value of each band. -- Value Type: DOUBLEARRAY
npixels True N/A string This is the number of pixels in the raster. -- Value Type: ULONG64
correlation True N/A string This is the correlation matrix of the data. -- Value Type: DOUBLEARRAY
covariance True N/A string This is the covariance matrix of the data. -- Value Type: DOUBLEARRAY
stddev True N/A string This is the standard deviation data value of each band. -- Value Type: DOUBLEARRAY
eigenvalues True N/A string This is the eigenvalues of the data. -- Value Type: DOUBLEARRAY
mean True N/A string This is the mean data value of each band. -- Value Type: DOUBLEARRAY

Output structure

The output files 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 Statistics.

Contact

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