{"_id":"5a3c0ac971d71200262f5c0e","project":"55faeacad0e22017005b8265","version":{"_id":"55faeacad0e22017005b8268","project":"55faeacad0e22017005b8265","__v":36,"createdAt":"2015-09-17T16:31:06.800Z","releaseDate":"2015-09-17T16:31:06.800Z","categories":["55faeacbd0e22017005b8269","55faf550764f50210095078e","55faf5b5626c341700fd9e96","55faf8a7825d5f19001fa386","560052f91503430d007cc88f","560054f73aa0520d00da0b1a","56005aaf6932a00d00ba7c62","56005c273aa0520d00da0b3f","5601ae7681a9670d006d164d","5601ae926811d00d00ceb487","5601aeb064866b1900f4768d","5601aee850ee460d0002224c","5601afa02499c119000faf19","5601afd381a9670d006d1652","561d4c78281aec0d00eb27b6","561d588d8ca8b90d00210219","563a5f934cc3621900ac278c","5665c5763889610d0008a29e","566710a36819320d000c2e93","56ddf6df8a5ae10e008e3926","56e1c96b2506700e00de6e83","56e1ccc4e416450e00b9e48c","56e1ccdfe63f910e00e59870","56e1cd10bc46be0e002af26a","56e1cd21e416450e00b9e48e","56e3139a51857d0e008e77be","573b4f62ef164e2900a2b881","57c9d1335fd8ca0e006308ed","57e2bd9d1e7b7220000d7fa5","57f2b992ac30911900c7c2b6","58adb5c275df0f1b001ed59b","58c81b5c6dc7140f003c3c46","595412446ed4d9001b3e7b37","59e76ce41938310028037295","5a009de510890d001c2aabfe","5a96f89c89442e002041144b"],"is_deprecated":false,"is_hidden":false,"is_beta":false,"is_stable":true,"codename":"v1","version_clean":"1.0.0","version":"1"},"category":{"_id":"573b4f62ef164e2900a2b881","__v":0,"project":"55faeacad0e22017005b8265","version":"55faeacad0e22017005b8268","sync":{"url":"","isSync":false},"reference":false,"createdAt":"2016-05-17T17:05:38.443Z","from_sync":false,"order":9,"slug":"algorithm-guide","title":"Algorithms"},"user":"55fae9d4825d5f19001fa379","__v":0,"parentDoc":null,"updates":[],"next":{"pages":[],"description":""},"createdAt":"2017-12-21T19:26:01.874Z","link_external":false,"link_url":"","githubsync":"","sync_unique":"","hidden":false,"api":{"results":{"codes":[]},"settings":"","auth":"required","params":[],"url":""},"isReference":false,"order":163,"body":"### Inputs\nThe following table lists all ENVI_SpectralSubspaceBackgroundStatistics inputs.\nMandatory (optional) settings are listed as Required = True (Required = False).\n\n  Name  |  Required  |  Default  |  Valid Values  |  Description  \n--------|:----------:|-----------|----------------|---------------\nfile_types|False|N/A|string|GBDX Option. Comma seperated list of permitted file type extensions. Use this to filter input files -- Value Type: STRING`[*]`\ninput_raster|True|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Specify a raster for computing subspace background statistics. -- Value Type: ENVIRASTER\ninput_raster_format|False|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Provide the format of the image, for example: landsat-8. -- Value Type: STRING\ninput_raster_band_grouping|False|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Provide the name of the band grouping to be used in the task, ie - panchromatic. -- Value Type: STRING\ninput_raster_filename|False|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Provide the explicit relative raster filename that ENVI will open. This overrides any file lookup in the task runner. -- Value Type: STRING\nthreshold|False| 0.9|string|Specify the fraction of the background to use for calculating the subspace background statistics. The data type is floating-point. The allowable range is 0.500 to 1.000 (the entire image). -- Value Type: DOUBLE -- Default Value: 0.9\n\n\n### Outputs\n\nThe following table lists all ENVI_SpectralSubspaceBackgroundStatistics outputs.\nMandatory (optional) settings are listed as Required = True (Required = False).\n\n  Name  |  Required  |  Default  |  Valid Values  |  Description\n--------|:----------:|-----------|----------------|---------------\ntask_meta_data|False|N/A|directory|GBDX Option. Output location for task meta data such as execution log and output JSON\nmean|False|N/A|string|The mean of the subspace background, one for each input bands. -- Value Type: DOUBLEARRAY\ncovariance|False|N/A|string|This is the covariance matrix of the subspace background, returned as a double-precision array `[number of bands, number of classes]. -- Value Type: DOUBLEARRAY\neigenvalues|False|N/A|string|The eigenvalues of the subspace background. -- Value Type: DOUBLEARRAY\n\n\n**Output structure**\n\n\n\n### Background\nFor additional background information on this task please refer to the [Harris Geospatial ENVI documentation](http://www.harrisgeospatial.com/docs/home.html) and \n[ENVI® Spectral Subspace Background Statistics](http://www.harrisgeospatial.com/docs/envispectralsubspacebackgroundstatisticstask.html). \n\n### Contact\nIf you have any questions or issues with this task, please contact [gbdx-support:::at:::digitalglobe.com](mailto:gbdx-support@digitalglobe.com).","excerpt":"This task removes anomalous pixels and can be used prior to calculating background statistics. When the true background is better characterized with subspace background, the spectral detection methods achieve greater target-to-background separation. This can potentially improve detection results, particularly in scenes that contain a lot of clutter or man-made objects.\n    \n**GBDX Registered Name:** ENVI_SpectralSubspaceBackgroundStatistics\n\n**Provider:** Harris Geospatial Solutions","slug":"envi-spectral-subspace-background-statistics","type":"basic","title":"ENVI® Spectral Subspace Background Statistics"}

ENVI® Spectral Subspace Background Statistics

This task removes anomalous pixels and can be used prior to calculating background statistics. When the true background is better characterized with subspace background, the spectral detection methods achieve greater target-to-background separation. This can potentially improve detection results, particularly in scenes that contain a lot of clutter or man-made objects. **GBDX Registered Name:** ENVI_SpectralSubspaceBackgroundStatistics **Provider:** Harris Geospatial Solutions

### Inputs The following table lists all ENVI_SpectralSubspaceBackgroundStatistics 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](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Specify a raster for computing subspace background statistics. -- Value Type: ENVIRASTER input_raster_format|False|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Provide the format of the image, for example: landsat-8. -- Value Type: STRING input_raster_band_grouping|False|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|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](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Provide the explicit relative raster filename that ENVI will open. This overrides any file lookup in the task runner. -- Value Type: STRING threshold|False| 0.9|string|Specify the fraction of the background to use for calculating the subspace background statistics. The data type is floating-point. The allowable range is 0.500 to 1.000 (the entire image). -- Value Type: DOUBLE -- Default Value: 0.9 ### Outputs The following table lists all ENVI_SpectralSubspaceBackgroundStatistics 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 mean|False|N/A|string|The mean of the subspace background, one for each input bands. -- Value Type: DOUBLEARRAY covariance|False|N/A|string|This is the covariance matrix of the subspace background, returned as a double-precision array `[number of bands, number of classes]. -- Value Type: DOUBLEARRAY eigenvalues|False|N/A|string|The eigenvalues of the subspace background. -- Value Type: DOUBLEARRAY **Output structure** ### Background For additional background information on this task please refer to the [Harris Geospatial ENVI documentation](http://www.harrisgeospatial.com/docs/home.html) and [ENVI® Spectral Subspace Background Statistics](http://www.harrisgeospatial.com/docs/envispectralsubspacebackgroundstatisticstask.html). ### Contact If you have any questions or issues with this task, please contact [gbdx-support@digitalglobe.com](mailto:gbdx-support@digitalglobe.com).