GBDX

ENVI® Generate Tie Points By Cross Correlation

This task performs automatic tie point generation using cross correlation as a similarity measure. This method works well for general purposes, especially registering images with similar modality.

GBDX Registered Name: ENVI_GenerateTiePointsByCrossCorrelation
Provider: Harris Geospatial Solutions

Note: If using this task to register one image to another, please refer to ENVI® Coregistration Workflow task for a complete image registration workflow.

Inputs

The following table lists all ENVI_GenerateTiePointsByCrossCorrelation 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_seed_tiepoints False N/A See ENVITIEPOINTSET input type This is a reference to the input seed tie points. -- Value Type: ENVITIEPOINTSET
matching_window False 61 string Specify the matching window size used for computing the matching score between the two images. -- Value Type: UINT -- Default Value: 61
requested_number_of_tiepoints False 121 string Specify the requested number of tie points. -- Value Type: UINT -- Default Value: 121
output_tiepoints_uri_filename False N/A string Specify a string with the fully-qualified path and filename for OUTPUT_TIEPOINTS. -- Value Type: STRING
search_window False 255 string Specify the tolerance for the search range. -- Value Type: UINT -- Default Value: 255
minimum_matching_score False 0.6 string Specify the minimum matching score to automatically remove the tie points if the matching score is less than the value. -- Value Type: DOUBLE -- Default Value: 0.6
interest_operator False "forstner" string Specify the interest operator to use to identify feature points. -- Value Type: STRING -- Default Value: "Forstner"
input_raster1 True N/A See ENVIRASTER input type Specify the first raster. -- Value Type: ENVIRASTER
input_raster1_format False N/A string Provide the format of the image, for example: landsat-8. -- Value Type: STRING
input_raster1_band_grouping False N/A string Provide the name of the band grouping to be used in the task, ie - panchromatic. -- Value Type: STRING
input_raster1_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_raster2 True N/A See ENVIRASTER input type Specify the second raster. -- Value Type: ENVIRASTER
input_raster2_format False N/A string Provide the format of the image, for example: landsat-8. -- Value Type: STRING
input_raster2_band_grouping False N/A string Provide the name of the band grouping to be used in the task, ie - panchromatic. -- Value Type: STRING
input_raster2_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

Outputs

The following table lists all ENVI_GenerateTiePointsByCrossCorrelation 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_tiepoints_uri True N/A directory Output for OUTPUT_TIEPOINTS. -- Value Type: ENVIURI
matching_scores False N/A string This is the matching scores of the tie points, returned as a double-precision array `[number of tie points]. -- Value Type: DOUBLEARRAY

Output structure

The output_tiepoints_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 Tie Points By Cross Correlation.

Contact

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

ENVI® Generate Tie Points By Cross Correlation

This task performs automatic tie point generation using cross correlation as a similarity measure. This method works well for general purposes, especially registering images with similar modality.

GBDX Registered Name: ENVI_GenerateTiePointsByCrossCorrelation
Provider: Harris Geospatial Solutions