{"_id":"57dc3cdb0e74d920006859a1","parentDoc":null,"version":{"_id":"55faeacad0e22017005b8268","project":"55faeacad0e22017005b8265","__v":37,"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","5b3f9b7267cbc90003d283a5"],"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"},"project":"55faeacad0e22017005b8265","__v":1,"user":"55fae9d4825d5f19001fa379","updates":[],"next":{"pages":[],"description":""},"createdAt":"2016-09-16T18:41:31.654Z","link_external":false,"link_url":"","githubsync":"","sync_unique":"","hidden":false,"api":{"results":{"codes":[]},"settings":"","auth":"required","params":[],"url":""},"isReference":false,"order":128,"body":"### Imagery Examples\n[block:image]\n{\n  \"images\": [\n    {\n      \"image\": [\n        \"https://files.readme.io/63e5f09-ENVI_QuerySpectralIndices_Legend.jpg\",\n        \"ENVI_QuerySpectralIndices_Legend.jpg\",\n        800,\n        320,\n        \"#c7beb2\"\n      ],\n      \"caption\": \"This image shows the image file and the JSON output list from ENVI Query Spectral Index\"\n    }\n  ]\n}\n[/block]\n### Quickstart\nThis is a workflow example for basic processing.\n[block:code]\n{\n  \"codes\": [\n    {\n      \"code\": \"# Quickstart Example running the task name.\\n\\n# Initialize the Environment.\\nfrom os.path import join, split\\nfrom gbdxtools import Interface\\ngbdx = Interface()\\n\\ntasks = []\\noutput_location = 'ENVI/QuerySpectralIndices'\\n\\ncat_id = '105001000672E000'\\n\\n# Image Auto ordering task parameters\\norder = gbdx.Task(\\\"Auto_Ordering\\\")\\norder.inputs.cat_id = cat_id\\norder.impersonation_allowed = True\\norder.persist = True\\norder.timeout = 36000\\ntasks += [order]\\n\\n# Image AOP task parameters\\naop = gbdx.Task(\\\"AOP_Strip_Processor\\\")\\naop.inputs.data = order.outputs.s3_location.value\\naop.inputs.bands = 'MS'\\naop.inputs.enable_dra = False\\naop.outputs.data.persist = True\\naop.outputs.data.persist_location = output_location+'/aop'\\naop.timeout = 36000\\ntasks += [aop]\\n\\n# Create a basic classification\\nenvi_query = gbdx.Task(\\\"ENVI_QuerySpectralIndices\\\")\\nenvi_query.inputs.input_raster = aop.outputs.data.value\\ntasks += [envi_query]\\n\\nworkflow = gbdx.Workflow(tasks)\\nworkflow.savedata(\\n    envi_query.outputs.available_indices, location=output_location\\n)\\nworkflow.savedata(\\n    envi_query.outputs.task_meta_data, location=output_location\\n)\\n\\nworkflow.execute()\",\n      \"language\": \"python\"\n    }\n  ]\n}\n[/block]\n\n### Inputs\nThe following table lists all ENVI_QuerySpectralIndices 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 to query for available spectral indices. -- 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\n\n### Outputs\n\nThe following table lists all ENVI_QuerySpectralIndices 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\navailable_indices|True|N/A|string|A string array with the spectral indices that can be computed for the input raster. -- Value Type: STRINGARRAY\n\n**Output structure**\n\nThe output of this task is a string port listing the available indices, based on the bands available in the image file. This port can be used to chain to another task. Alternatively, the output is written to a JSON file in the task_meta_data port, where the list can be found after the Task completes.\n\n### Issues\nAdditional parsing of the output list of indices is necessary before using the list as input for the ENVI Spectral Indices task.\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® Query Spectral Indices](http://www.harrisgeospatial.com/docs/enviqueryspectralindicestask.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 returns the spectral indices that can be computed for a given input raster, based on its wavelength metadata. The output is a JSON file that lists the available indices, based on the bands available in the image file.\n\t\n**GBDX Registered Name**: ENVI_QuerySpectralIndices\n**Provider**: Harris Geospatial Solutions","slug":"envi-query-spectral-indices","type":"basic","title":"ENVI® Query Spectral Indices"}

Getting Started

GBDX Operations

GBDX Stories

Data Sets on GBDX

Raster Data Access (RDA) Guide

GBDX Notebooks

Authentication Guide

Ordering Guide

Catalog V2 API Guide

Algorithms

Tasks and Workflows Guide

S3 Storage Service Guide

Web Application (Deprecated)

Thumbnail Service Guide (Deprecated)

AnswerFactory Application

Read & Query Vector Services Guide

Aggregations & Facets Vector Services Guide

Write & Ingest Vector Services Guide

Vector Export Service

IDAHO Guide

Helpful Links

ENVI® Query Spectral Indices

This task returns the spectral indices that can be computed for a given input raster, based on its wavelength metadata. The output is a JSON file that lists the available indices, based on the bands available in the image file. **GBDX Registered Name**: ENVI_QuerySpectralIndices **Provider**: Harris Geospatial Solutions
### Imagery Examples [block:image] { "images": [ { "image": [ "https://files.readme.io/63e5f09-ENVI_QuerySpectralIndices_Legend.jpg", "ENVI_QuerySpectralIndices_Legend.jpg", 800, 320, "#c7beb2" ], "caption": "This image shows the image file and the JSON output list from ENVI Query Spectral Index" } ] } [/block] ### Quickstart This is a workflow example for basic processing. [block:code] { "codes": [ { "code": "# Quickstart Example running the task name.\n\n# Initialize the Environment.\nfrom os.path import join, split\nfrom gbdxtools import Interface\ngbdx = Interface()\n\ntasks = []\noutput_location = 'ENVI/QuerySpectralIndices'\n\ncat_id = '105001000672E000'\n\n# Image Auto ordering task parameters\norder = gbdx.Task(\"Auto_Ordering\")\norder.inputs.cat_id = cat_id\norder.impersonation_allowed = True\norder.persist = True\norder.timeout = 36000\ntasks += [order]\n\n# Image AOP task parameters\naop = gbdx.Task(\"AOP_Strip_Processor\")\naop.inputs.data = order.outputs.s3_location.value\naop.inputs.bands = 'MS'\naop.inputs.enable_dra = False\naop.outputs.data.persist = True\naop.outputs.data.persist_location = output_location+'/aop'\naop.timeout = 36000\ntasks += [aop]\n\n# Create a basic classification\nenvi_query = gbdx.Task(\"ENVI_QuerySpectralIndices\")\nenvi_query.inputs.input_raster = aop.outputs.data.value\ntasks += [envi_query]\n\nworkflow = gbdx.Workflow(tasks)\nworkflow.savedata(\n envi_query.outputs.available_indices, location=output_location\n)\nworkflow.savedata(\n envi_query.outputs.task_meta_data, location=output_location\n)\n\nworkflow.execute()", "language": "python" } ] } [/block] ### Inputs The following table lists all ENVI_QuerySpectralIndices 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 to query for available spectral indices. -- 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 ### Outputs The following table lists all ENVI_QuerySpectralIndices 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 available_indices|True|N/A|string|A string array with the spectral indices that can be computed for the input raster. -- Value Type: STRINGARRAY **Output structure** The output of this task is a string port listing the available indices, based on the bands available in the image file. This port can be used to chain to another task. Alternatively, the output is written to a JSON file in the task_meta_data port, where the list can be found after the Task completes. ### Issues Additional parsing of the output list of indices is necessary before using the list as input for the ENVI Spectral Indices task. ### 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® Query Spectral Indices](http://www.harrisgeospatial.com/docs/enviqueryspectralindicestask.html). ### Contact If you have any questions or issues with this task, please contact [gbdx-support@digitalglobe.com](mailto:gbdx-support@digitalglobe.com).