Use Case - Granule Search (CWIC/CMR)

Use Case - Granule Search (CWIC/CMR)#

This chapter provides a comprehensive and detailed process about how to implement a WGISS OpenSearch client, which includes how to retrieve the IDN collection ID for the collection of interest, and how to build an OpenSearch request for a CWIC data partner. Within CMR, CWIC partners are available directly from CMR. The IDN response records contain direct links to the OSDD from the CWIC partner server, where possible. This can be used to construct a granule search directly from the partner.

Retrieve Collection OSDD via IDN OpenSearch#

The steps in this section are identical to the steps explained in the section Retrieve Collections via IDN OpenSearch. To fit the end-to-end CWIC use case, the parameter values for the collection search has been selected in such a way that the granule search is eventually performed through CWIC.

Use Case Overview

Title

Clients start from the IDN OpenSearch

Description

This use case describes steps for retrieving a collection ID from the IDN OpenSearch.

Actors

OpenSearch client, IDN OpenSearch Server

Initial Status and Preconditions

Clients have the IDN OpenSearch access URL.

The following steps describe this use case.

Step 1

Obtain the IDN OpenSearch OSDD to formulate a valid IDN OpenSearch request.

The OpenSearch Description Document is accessible at the fixed location https://cmr.earthdata.nasa.gov/opensearch/collections/descriptor_document.xml?clientId=ceosOpenSearchDoc and contains the URL template to be used for collection search.

response = requests.get( url_osdd )

xmlstr = minidom.parseString(response.text).toprettyxml(indent='  ',newl='')
# md("```xml\n" + xmlstr + "\n```\n")

Find the URL template for collection search with Atom responses.

root = ElementTree.fromstring(response.text)

ns = {'os': 'http://a9.com/-/spec/opensearch/1.1/'}
collection_url_atom = root.find('os:Url[@rel="collection"][@type="application/atom+xml"]', ns)

collection_template = collection_url_atom.attrib['template']
collection_template

'https://cmr.earthdata.nasa.gov/opensearch/collections.atom?keyword={os:searchTerms?}&instrument={echo:instrument?}&satellite={eo:platform?}&boundingBox={geo:box?}&lat={geo:lat?}&lon={geo:lon?}&radius={geo:radius?}&geometry={geo:geometry?}&placeName={geo:name?}&startTime={time:start?}&endTime={time:end?}&cursor={os:startPage?}&numberOfResults={os:count?}&offset={os:startIndex?}&uid={geo:uid?}&hasGranules={echo:hasGranules?}&isCwic={echo:isCwic?}&isGeoss={echo:isGeoss?}&isCeos={echo:isCeos?}&isEosdis={echo:isEosdis?}&isFedeo={echo:isFedeo?}&provider={echo:provider?}&clientId=ceosOpenSearchDoc'

Step 2

Search collections of interest through IDN OpenSearch with proper request parameters (e.g. spatial footprint, temporal extent and keyword). A complete list of supported request parameters, extracted from the IDN OpenSearch OSDD, was included in the section Available Collection Search Criteria.

An example request can be formed as follows.

# request_url = get_api_request(collection_template, {'count': '1', 'searchTerms': 'Landsat_8'})
request_url = get_api_request(collection_template, {'count': '1', 'searchTerms': 'GEDI L4A Footprint'})
request_url

'https://cmr.earthdata.nasa.gov/opensearch/collections.atom?keyword=GEDI L4A Footprint&numberOfResults=1&clientId=ceosOpenSearchDoc'

response = requests.get( request_url )
xmlstr = minidom.parseString(response.text).toprettyxml(indent='   ', newl='')
md("```xml\n" + xmlstr + "\n```\n")

<?xml version="1.0" ?><feed xmlns:relevance="http://a9.com/-/opensearch/extensions/relevance/1.0/" xmlns:os="http://a9.com/-/spec/opensearch/1.1/" xmlns:georss="http://www.georss.org/georss" xmlns="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:echo="https://cmr.earthdata.nasa.gov/search/site/docs/search/api.html#atom" xmlns:esipdiscovery="http://commons.esipfed.org/ns/discovery/1.2/" xmlns:gml="http://www.opengis.net/gml" xmlns:time="http://a9.com/-/opensearch/extensions/time/1.0/" xmlns:eo="http://a9.com/-/opensearch/extensions/eo/1.0/" esipdiscovery:version="1.2">   
     <updated>2025-07-15T07:59:18.689Z</updated>   
     <id>https://cmr.earthdata.nasa.gov/opensearch/collections.atom</id>   
     <author>      
          <name>CMR</name>      
          <email>echodev@echo.nasa.gov</email>      
     </author>   
     <title type="text">ECHO dataset metadata</title>   
     <subtitle type="text">Search parameters: keyword =&gt; GEDI L4A Footprint</subtitle>   
     <link href="https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml" hreflang="en-US" type="application/opensearchdescription+xml" rel="search"/>   
     <link href="https://cmr.earthdata.nasa.gov/opensearch/collections.atom?keyword=GEDI%20L4A%20Footprint&amp;numberOfResults=1&amp;clientId=ceosOpenSearchDoc" hreflang="en-US" type="application/atom+xml" rel="self"/>   
     <link href="https://cmr.earthdata.nasa.gov/opensearch/collections.atom?keyword=GEDI%20L4A%20Footprint&amp;numberOfResults=1&amp;clientId=ceosOpenSearchDoc&amp;cursor=7" hreflang="en-US" type="application/atom+xml" rel="last"/>   
     <link href="https://cmr.earthdata.nasa.gov/opensearch/collections.atom?keyword=GEDI%20L4A%20Footprint&amp;numberOfResults=1&amp;clientId=ceosOpenSearchDoc&amp;cursor=2" hreflang="en-US" type="application/atom+xml" rel="next"/>   
     <link href="https://cmr.earthdata.nasa.gov/opensearch/collections.atom?keyword=GEDI%20L4A%20Footprint&amp;numberOfResults=1&amp;clientId=ceosOpenSearchDoc&amp;cursor=1" hreflang="en-US" type="application/atom+xml" rel="first"/>   
     <link href="https://wiki.earthdata.nasa.gov/display/echo/Open+Search+API+release+information" hreflang="en-US" type="text/html" rel="describedBy" title="Release Notes"/>   
     <os:Query xmlns:geo="http://a9.com/-/opensearch/extensions/geo/1.0/" role="request" os:searchTerms="GEDI L4A Footprint"/>   
     <os:totalResults>6</os:totalResults>   
     <os:itemsPerPage>1</os:itemsPerPage>   
     <os:startIndex>1</os:startIndex>   
     <entry>      
          <id>https://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C2237824918-ORNL_CLOUD</id>      
          <author>         
               <name>CMR</name>         
               <email>echodev@echo.nasa.gov</email>         
          </author>      
          <consortium>GEOSS</consortium>      
          <consortium>EOSDIS</consortium>      
          <title type="text">GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1</title>      
          <summary type="text">This dataset contains Global Ecosystem Dynamics Investigation (GEDI) Level 4A (L4A) Version 2 predictions of the aboveground biomass density (AGBD; in Mg/ha) and estimates of the prediction standard error within each sampled geolocated laser footprint. In this version, the granules are in sub-orbits. The algorithm setting group selection used for GEDI02_A Version 2 has been modified for Evergreen Broadleaf Trees in South America to reduce false positive errors resulting from the selection of waveform modes above ground elevation as the lowest mode. The footprints are located within the global latitude band observed by the International Space Station (ISS), nominally 51.6 degrees N and S and reported for the period 2019-04-18 to 2024-11-27. No acquisitions occurred while the GEDI instrument was in storage on the International Space Station (ISS) from March 2023 to April 2024. The GEDI instrument consists of three lasers producing a total of eight beam ground transects, which instantaneously sample eight ~25 m footprints spaced approximately every 60 m along-track. The GEDI beam transects are spaced approximately 600 m apart on the Earth's surface in the cross-track direction, for an across-track width of ~4.2 km. Footprint AGBD was derived from parametric models that relate simulated GEDI Level 2A (L2A) waveform relative height (RH) metrics to field plot estimates of AGBD. Height metrics from simulated waveforms associated with field estimates of AGBD from multiple regions and plant functional types (PFTs) were compiled to generate a calibration dataset for models representing the combinations of world regions and PFTs (i.e., deciduous broadleaf trees, evergreen broadleaf trees, evergreen needleleaf trees, deciduous needleleaf trees, and the combination of grasslands, shrubs, and woodlands). For each of the eight beams, additional data are reported with the AGBD estimates, including the associated uncertainty metrics, quality flags, model inputs, and other information about the GEDI L2A waveform for this selected algorithm setting group. Model inputs include the scaled and transformed GEDI L2A RH metrics, footprint geolocation variables and land cover input data including PFTs and the world region identifiers. Additional model outputs include the AGBD predictions for each of the six GEDI L2A algorithm setting groups with AGBD in natural and transformed units and associated prediction uncertainty for each GEDI L2A algorithm setting group. Providing these ancillary data products will allow users to evaluate and select alternative algorithm setting groups. Also provided are outputs of parameters and variables from the L4A models used to generate AGBD predictions that are required as input to the GEDI04_B algorithm to generate 1-km gridded products.</summary>      
          <updated>2025-04-14T22:32:09.000Z</updated>      
          <link rel="enclosure" hreflang="en-US" href="https://search.earthdata.nasa.gov/search?q=GEDI_L4A_AGB_Density_V2_1_2056&amp;ac=true"/>      
          <link rel="describedBy" hreflang="en-US" href="https://daac.ornl.gov/GEDI/guides/GEDI_L4A_AGB_Density_V2_1.html" type="text/html"/>      
          <link rel="via" hreflang="en-US" href="https://doi.org/10.3334/ORNLDAAC/2056"/>      
          <link rel="http://esipfed.org/ns/fedsearch/1.1/service#" hreflang="en-US" href="https://opendap.earthdata.nasa.gov/"/>      
          <link rel="icon" hreflang="en-US" href="https://daac.ornl.gov/GEDI/guides/GEDI_L4A_AGB_Density_V2_1_Fig1.png" type="image/png"/>      
          <link rel="via" hreflang="en-US" href="https://gedi.umd.edu"/>      
          <link rel="describedBy" hreflang="en-US" href="https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/GEDI_ATBD_L4A_v1.0.pdf" type="application/pdf"/>      
          <link rel="describedBy" hreflang="en-US" href="https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/GEDI_L4A_V2_Common_Queries.pdf" type="application/pdf"/>      
          <link rel="describedBy" hreflang="en-US" href="https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/GEDI_L4A_AGB_Density_V2_1.pdf" type="application/pdf"/>      
          <link rel="describedBy" hreflang="en-US" href="https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/list_of_deleted_files_mw_163_182.txt"/>      
          <link rel="describedBy" hreflang="en-US" href="https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/list_of_revised_files_mw_163_182.txt"/>      
          <link rel="describedBy" hreflang="en-US" href="https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/list_of_deleted_files_orbits_17591_09899.txt"/>      
          <link rel="describedBy" hreflang="en-US" href="https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/GEDI_L4A_V2_Product_Data_Dictionary.pdf" type="application/pdf"/>      
          <link rel="describedBy" hreflang="en-US" href="https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/list_of_revised_files_orbits_17591_09899.txt"/>      
          <link href="https://cmr.earthdata.nasa.gov/opensearch/granules.atom?clientId=ceosOpenSearchDoc&amp;shortName=GEDI_L4A_AGB_Density_V2_1_2056&amp;versionId=2.1&amp;dataCenter=ORNL_CLOUD" hreflang="en-US" type="application/atom+xml" rel="search" title="Search for granules"/>      
          <link href="https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml?collectionConceptId=C2237824918-ORNL_CLOUD&amp;clientId=ceosOpenSearchDoc" hreflang="en-US" type="application/opensearchdescription+xml" rel="search" title="Granule OpenSearch Descriptor Document"/>      
          <link href="https://cmr.earthdata.nasa.gov/search/concepts/C2237824918-ORNL_CLOUD.xml" hreflang="en-US" type="application/xml" rel="via" title="Product metadata"/>      
          <dc:identifier>C2237824918-ORNL_CLOUD</dc:identifier>      
          <dc:date>2019-04-17T00:00:00.000Z/2024-11-27T23:59:59.999Z</dc:date>      
          <echo:datasetId>GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1</echo:datasetId>      
          <echo:shortName>GEDI_L4A_AGB_Density_V2_1_2056</echo:shortName>      
          <echo:versionId>2.1</echo:versionId>      
          <echo:entryId>GEDI_L4A_AGB_Density_V2_1_2056_2.1</echo:entryId>      
          <echo:dataCenter>ORNL_CLOUD</echo:dataCenter>      
          <echo:archiveCenter>ORNL_DAAC</echo:archiveCenter>      
          <echo:organization>ORNL_DAAC</echo:organization>      
          <echo:processingLevelId>4</echo:processingLevelId>      
          <echo:coordinateSystem>CARTESIAN</echo:coordinateSystem>      
          <echo:orbitParameters/>      
          <georss:box>-53 -180 55.7983 180</georss:box>      
          <echo:hasVariables>true</echo:hasVariables>      
          <echo:hasFormats>true</echo:hasFormats>      
          <echo:hasTransforms>false</echo:hasTransforms>      
          <echo:hasCombine>false</echo:hasCombine>      
          <echo:hasSpatialSubsetting>true</echo:hasSpatialSubsetting>      
          <echo:hasTemporalSubsetting>true</echo:hasTemporalSubsetting>      
          <echo:cloudHosted>true</echo:cloudHosted>      
          <relevance:score>1.32</relevance:score>      
          <echo:tag>         
               <echo:tagKey>gov.nasa.eosdis</echo:tagKey>         
          </echo:tag>      
          <echo:is_eosdis>true</echo:is_eosdis>      
     </entry>   
</feed>

Step 3

From the IDN OpenSearch response, obtain the OSDD endpoint for the collection by parsing the href attribute under <link rel="search" type=”application/opensearchdescription+xml” >

root = ElementTree.fromstring(response.text)
# Extract <link> element with the OSDD for the granule search
el = root.find('{http://www.w3.org/2005/Atom}entry/{http://www.w3.org/2005/Atom}link[@rel="search"][@type="application/opensearchdescription+xml"]')
xmltxt = ElementTree.tostring(el, encoding='unicode', method='xml')
md("```xml\n" + xmltxt + "\n```\n")

<ns0:link xmlns:ns0="http://www.w3.org/2005/Atom" href="https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml?collectionConceptId=C2237824918-ORNL_CLOUD&amp;clientId=ceosOpenSearchDoc" hreflang="en-US" type="application/opensearchdescription+xml" rel="search" title="Granule OpenSearch Descriptor Document" />
    

url_osdd = el.attrib['href']
el.attrib['href']

'https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml?collectionConceptId=C2237824918-ORNL_CLOUD&clientId=ceosOpenSearchDoc'

# work-around
# Extract the short name for future use.  Should not be needed according to CEOS OpenSearch Best Practices.  
el = root.find('{http://www.w3.org/2005/Atom}entry/{https://cmr.earthdata.nasa.gov/search/site/docs/search/api.html#atom}shortName')
el.text
short_name = el.text

This response will provide the key component of searching CMR for the desired collection using the CMR conceptID. For Landsat 8, this will be C1235542031-USGS_LTA. Now obtain from CMR the URL for the local OSDD (in this case, at USGS), with the request

Retrieve the response (i.e. the OSDD document).

response = requests.get( url_osdd )

xmlstr = minidom.parseString(response.text).toprettyxml(indent='  ',newl='')
md("```xml\n" + xmlstr + "\n```\n")

<?xml version="1.0" ?><feed xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:geo="http://a9.com/-/opensearch/extensions/geo/1.0/" xmlns:params="http://a9.com/-/spec/opensearch/extensions/paramseters/1.0/" xmlns:time="http://a9.com/-/opensearch/extensions/time/1.0/" xmlns:eop="http://a9.com/-/opensearch/extensions/eo/1.0/">  
    <title>OpenSearch Exception</title>  
    <subtitle type="text">No provider present within the `org.ceos.wgiss.cwic.granules.provider` tag.</subtitle>  
    <updated>2025-07-15T07:59:19Z</updated>  
    <id>https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml?collectionConceptId=C2237824918-ORNL_CLOUD&amp;clientId=ceosOpenSearchDoc</id>  
    <link title="self" rel="self" type="application/atom+xml" href="https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml?collectionConceptId=C2237824918-ORNL_CLOUD&amp;clientId=ceosOpenSearchDoc"/>  
    <totalResults>0</totalResults>  
</feed>

Warning

In the previous step, the OSDD could not be retrieved as the URL included in the response is not the one with short_name. See also step 5 in chapter 5 “Outline” with the workaround to fix that.

root = ElementTree.fromstring(response.text)

try:
    el = root.find('{http://a9.com/-/spec/opensearch/1.1/}title')
    print(el.text)

    if (el.text == 'OpenSearch Exception'):
        url_osdd = "https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml?shortName=" + short_name
        print("Corrected OSDD URL: " + url_osdd)
except:
    pass

OpenSearch Exception
Corrected OSDD URL: https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml?shortName=GEDI_L4A_AGB_Density_V2_1_2056

url_osdd

'https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml?shortName=GEDI_L4A_AGB_Density_V2_1_2056'

In the response:

# Get the OSDD document for granule search
response = requests.get( url_osdd )

xmlstr = minidom.parseString(response.text).toprettyxml(indent='  ',newl='')
md("```xml\n" + xmlstr + "\n```\n")

<?xml version="1.0" ?><os:OpenSearchDescription xmlns:os="http://a9.com/-/spec/opensearch/1.1/" xmlns:echo="https://cmr.earthdata.nasa.gov/search/site/docs/search/api.html#atom" xmlns:geo="http://a9.com/-/opensearch/extensions/geo/1.0/" xmlns:time="http://a9.com/-/opensearch/extensions/time/1.0/" xmlns:params="http://a9.com/-/spec/opensearch/extensions/parameters/1.0/" xmlns:referrer="http://www.opensearch.org/Specifications/OpenSearch/Extensions/Referrer/1.0" xmlns:eo="http://a9.com/-/opensearch/extensions/eo/1.0/" xmlns:atom="http://www.w3.org/2005/Atom">  
    <os:ShortName>CMR Granules</os:ShortName>  
    <os:Description>NASA CMR Granule search using geo, time and parameter extensions</os:Description>  
    <os:Contact>echodev@echo.nasa.gov</os:Contact>  

    <os:Url type="application/atom+xml" rel="results" params:method="GET" template="https://cmr.earthdata.nasa.gov/opensearch/granules.atom?datasetId={echo:datasetId?}&amp;shortName=GEDI_L4A_AGB_Density_V2_1_2056&amp;versionId={echo:versionId?}&amp;dataCenter={echo:dataCenter?}&amp;boundingBox={geo:box?}&amp;lat={geo:lat?}&amp;lon={geo:lon?}&amp;radius={geo:radius?}&amp;geometry={geo:geometry?}&amp;placeName={geo:name?}&amp;startTime={time:start?}&amp;endTime={time:end?}&amp;cursor={os:startPage?}&amp;numberOfResults={os:count?}&amp;offset={os:startIndex?}&amp;uid={geo:uid?}&amp;parentIdentifier={eo:parentIdentifier?}">    
        <params:Parameter name="datasetId" uiDisplay="Collection identifier" value="{echo:datasetId}" title="Inventory associated with a dataset expressed as an ID" minimum="0"/>    
        <params:Parameter name="boundingBox" uiDisplay="Bounding box" value="{geo:box}" title="Inventory with a spatial extent overlapping this bounding box" minimum="0"/>    
        <params:Parameter name="lat" uiDisplay="Latitude" value="{geo:lat}" title="Inventory with latitude in decimal degrees, must be used together with lon and radius" minimum="0" minInclusive="-90.0" maxInclusive="90.0"/>    
        <params:Parameter name="lon" uiDisplay="Longitude" value="{geo:lon}" title="Inventory with longitude in decimal degrees, must be used together with lat and radius" minimum="0" minInclusive="-180.0" maxInclusive="180.0"/>    
        <params:Parameter name="radius" uiDisplay="Radius" value="{geo:radius}" title="Inventory with the search radius in meters, must be used together with lat and lon" minimum="0" minInclusive="10" maxInclusive="6000000"/>    
        <params:Parameter name="geometry" uiDisplay="Geometry" value="{geo:geometry}" title="Inventory with a spatial extent overlapping this geometry" minimum="0">      
            <atom:link rel="profile" href="http://www.opengis.net/wkt/LINESTRING" title="This service accepts WKT LineStrings"/>      
            <atom:link rel="profile" href="http://www.opengis.net/wkt/POINT" title="This service accepts WKT Points"/>      
            <atom:link rel="profile" href="http://www.opengis.net/wkt/POLYGON" title="This service accepts WKT Polygons"/>      
        </params:Parameter>    
        <params:Parameter name="placeName" uiDisplay="Place name" value="{geo:name}" title="Inventory with a spatial location described by this name" minimum="0"/>    
        <params:Parameter name="startTime" uiDisplay="Start time" value="{time:start}" title="Inventory with a temporal extent containing this start time" minimum="0"/>    
        <params:Parameter name="endTime" uiDisplay="End time" value="{time:end}" title="Inventory with a temporal extent containing this end time" minimum="0"/>    
        <params:Parameter name="cursor" uiDisplay="Start page" value="{os:startPage}" title="Start page for the search result" minimum="0"/>    
        <params:Parameter name="numberOfResults" uiDisplay="Number of results" value="{os:count}" title="Maximum number of records in the search result" minimum="0" maxInclusive="2000"/>    
        <params:Parameter name="offset" uiDisplay="Start index" value="{os:startIndex}" title="0-based offset used to skip the specified number of results in the search result set" minimum="0"/>    
        <params:Parameter name="uid" uiDisplay="Unique identifier identifier" value="{geo:uid}" title="Inventory associated with this unique ID" minimum="0"/>    
        <params:Parameter name="parentIdentifier" uiDisplay="CMR Collection concept identifier" value="{eo:parentIdentifier}" title="Inventory associated with a dataset expressed as a CMR concept ID" minimum="0"/>    
        <params:Parameter name="clientId" uiDisplay="Client identifier" value="{referrer:source}" title="Client identifier to be used for metrics" minimum="0"/>    
    </os:Url>  

    <os:Url type="text/html" rel="results" params:method="GET" template="https://cmr.earthdata.nasa.gov/opensearch/granules.html?datasetId={echo:datasetId?}&amp;shortName=GEDI_L4A_AGB_Density_V2_1_2056&amp;versionId={echo:versionId?}&amp;dataCenter={echo:dataCenter?}&amp;boundingBox={geo:box?}&amp;lat={geo:lat?}&amp;lon={geo:lon?}&amp;radius={geo:radius?}&amp;geometry={geo:geometry?}&amp;placeName={geo:name?}&amp;startTime={time:start?}&amp;endTime={time:end?}&amp;cursor={os:startPage?}&amp;numberOfResults={os:count?}&amp;offset={os:startIndex?}&amp;uid={geo:uid?}&amp;parentIdentifier={eo:parentIdentifier?}">    
        <params:Parameter name="datasetId" uiDisplay="Collection identifier" value="{echo:datasetId}" title="Inventory associated with a dataset expressed as an ID" minimum="0"/>    
        <params:Parameter name="boundingBox" uiDisplay="Bounding box" value="{geo:box}" title="Inventory with a spatial extent overlapping this bounding box" minimum="0"/>    
        <params:Parameter name="lat" uiDisplay="Latitude" value="{geo:lat}" title="Inventory with latitude in decimal degrees, must be used together with lon and radius" minimum="0" minInclusive="-90.0" maxInclusive="90.0"/>    
        <params:Parameter name="lon" uiDisplay="Longitude" value="{geo:lon}" title="Inventory with longitude in decimal degrees, must be used together with lat and radius" minimum="0" minInclusive="-180.0" maxInclusive="180.0"/>    
        <params:Parameter name="radius" uiDisplay="Radius" value="{geo:radius}" title="Inventory with the search radius in meters, must be used together with lat and lon" minimum="0" minInclusive="10" maxInclusive="6000000"/>    
        <params:Parameter name="geometry" uiDisplay="Geometry" value="{geo:geometry}" title="Inventory with a spatial extent overlapping this geometry" minimum="0">      
            <atom:link rel="profile" href="http://www.opengis.net/wkt/LINESTRING" title="This service accepts WKT LineStrings"/>      
            <atom:link rel="profile" href="http://www.opengis.net/wkt/POINT" title="This service accepts WKT Points"/>      
            <atom:link rel="profile" href="http://www.opengis.net/wkt/POLYGON" title="This service accepts WKT Polygons"/>      
        </params:Parameter>    
        <params:Parameter name="placeName" uiDisplay="Place name" value="{geo:name}" title="Inventory with a spatial location described by this name" minimum="0"/>    
        <params:Parameter name="startTime" uiDisplay="Start time" value="{time:start}" title="Inventory with a temporal extent containing this start time" minimum="0"/>    
        <params:Parameter name="endTime" uiDisplay="End time" value="{time:end}" title="Inventory with a temporal extent containing this end time" minimum="0"/>    
        <params:Parameter name="cursor" uiDisplay="Start page" value="{os:startPage}" title="Start page for the search result" minimum="0"/>    
        <params:Parameter name="numberOfResults" uiDisplay="Number of results" value="{os:count}" title="Maximum number of records in the search result" minimum="0" maxInclusive="2000"/>    
        <params:Parameter name="offset" uiDisplay="Start index" value="{os:startIndex}" title="0-based offset used to skip the specified number of results in the search result set" minimum="0"/>    
        <params:Parameter name="uid" uiDisplay="Unique identifier identifier" value="{geo:uid}" title="Inventory associated with this unique ID" minimum="0"/>    
        <params:Parameter name="parentIdentifier" uiDisplay="CMR Collection concept identifier" value="{eo:parentIdentifier}" title="Inventory associated with a dataset expressed as a CMR concept ID" minimum="0"/>    
        <params:Parameter name="clientId" uiDisplay="Client identifier" value="{referrer:source}" title="Client identifier to be used for metrics" minimum="0"/>    
    </os:Url>  

    <os:Query role="example" echo:shortName="MOD02QKM" echo:versionId="005" echo:dataCenter="LAADS" geo:box="-180.0,-90.0,180.0,90.0" time:start="2002-05-04T00:00:00Z" time:end="2009-05-04T00:00:00Z" title="Sample search"/>  

    <os:Attribution>NASA CMR</os:Attribution>  
    <os:SyndicationRight>open</os:SyndicationRight>  
    <os:Tags>CMR NASA CWIC CEOS-OS-BP-V1.1/L3 ESIP OGC granule pageOffset=1 indexOffset=0</os:Tags>  
</os:OpenSearchDescription>

Retrieve Granules via OpenSearch#

After retrieving the OSDD endpoint by querying through the IDN OpenSearch, OpenSearch clients will sequentially interact with the host remote server for inventory search. The following table shows the basic information about the use case of interacting with WGISS Connected Data Assets via OpenSearch.

Use Case Overview

Title

Interact with CWIC OpenSearch APIs for inventory search

Description

This use case describes steps for executing inventory search based on the IDN collection

OSDD of interest.

Actors

OpenSearch client, Collection-specific granule OpenSearch API

Initial Status and Preconditions

Clients have the CWIC OpenSearch OSDD URL from IDN.

Step 4

Obtain the collection specific OSDD from the IDN response.

url_osdd

'https://cmr.earthdata.nasa.gov/opensearch/granules/descriptor_document.xml?shortName=GEDI_L4A_AGB_Density_V2_1_2056'

Step 5

Based on the OSDD, formulate an OpenSearch request for granules belonging to that collection.

# Extract URL template for granule search
root = ElementTree.fromstring(response.text)

ns = {'os': 'http://a9.com/-/spec/opensearch/1.1/'}
granule_search_template = root.find('os:Url[@rel="results"][@type="application/atom+xml"]', ns).attrib['template']

# collection_template = collection_url_atom.attrib['template']
granule_search_template

'https://cmr.earthdata.nasa.gov/opensearch/granules.atom?datasetId={echo:datasetId?}&shortName=GEDI_L4A_AGB_Density_V2_1_2056&versionId={echo:versionId?}&dataCenter={echo:dataCenter?}&boundingBox={geo:box?}&lat={geo:lat?}&lon={geo:lon?}&radius={geo:radius?}&geometry={geo:geometry?}&placeName={geo:name?}&startTime={time:start?}&endTime={time:end?}&cursor={os:startPage?}&numberOfResults={os:count?}&offset={os:startIndex?}&uid={geo:uid?}&parentIdentifier={eo:parentIdentifier?}'

request_url = get_api_request(granule_search_template, {'time:start': '1972-09-26T00:00:00Z'} )
request_url

'https://cmr.earthdata.nasa.gov/opensearch/granules.atom?&shortName=GEDI_L4A_AGB_Density_V2_1_2056&startTime=1972-09-26T00:00:00Z'

Step 6

Parse the CWIC OpenSearch response and extract the identifier for the granule of interest from id in the entry element.

response = requests.get( request_url )

# xmlstr = minidom.parseString(response.text).toprettyxml(indent='   ', newl='')
# md("```xml\n" + xmlstr + "\n```\n")

root = ElementTree.fromstring(response.text)
# Extract <entry> element 
# el = root.find('{http://www.w3.org/2005/Atom}entry')
xmltxt = ElementTree.tostring(root, encoding='unicode', method='xml')
md("```xml\n" + xmltxt + "\n```\n")

<ns0:feed xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:ns0="http://www.w3.org/2005/Atom" xmlns:ns1="http://commons.esipfed.org/ns/discovery/1.2/" xmlns:ns2="http://a9.com/-/spec/opensearch/1.1/" xmlns:ns3="https://cmr.earthdata.nasa.gov/search/site/docs/search/api.html#atom" xmlns:ns4="http://a9.com/-/opensearch/extensions/time/1.0/" xmlns:ns6="http://www.georss.org/georss" ns1:version="1.2">
  <ns0:updated>2025-07-15T07:59:19.812Z</ns0:updated>
  <ns0:id>https://cmr.earthdata.nasa.gov/opensearch/granules.atom</ns0:id>
  <ns0:author>
    <ns0:name>CMR</ns0:name>
    <ns0:email>echodev@echo.nasa.gov</ns0:email>
  </ns0:author>
  <ns0:title type="text">ECHO granule metadata</ns0:title>
  <ns0:subtitle type="text">Search parameters: shortName =&gt; GEDI_L4A_AGB_Density_V2_1_2056 startTime =&gt; 1972-09-26T00:00:00Z</ns0:subtitle>
  <ns0:link href="https://cmr.earthdata.nasa.gov/opensearch/granules.atom?datasetId=GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1" hreflang="en-US" type="application/atom+xml" rel="up" />
  <ns0:link href="https://cmr.earthdata.nasa.gov/opensearch/granules.atom?&amp;shortName=GEDI_L4A_AGB_Density_V2_1_2056&amp;startTime=1972-09-26T00:00:00Z" hreflang="en-US" type="application/atom+xml" rel="self" />
  <ns0:link href="https://cmr.earthdata.nasa.gov/opensearch/granules.atom?&amp;shortName=GEDI_L4A_AGB_Density_V2_1_2056&amp;startTime=1972-09-26T00:00:00Z&amp;cursor=8507" hreflang="en-US" type="application/atom+xml" rel="last" />
  <ns0:link href="https://cmr.earthdata.nasa.gov/opensearch/granules.atom?&amp;shortName=GEDI_L4A_AGB_Density_V2_1_2056&amp;startTime=1972-09-26T00:00:00Z&amp;cursor=2" hreflang="en-US" type="application/atom+xml" rel="next" />
  <ns0:link href="https://cmr.earthdata.nasa.gov/opensearch/granules.atom?&amp;shortName=GEDI_L4A_AGB_Density_V2_1_2056&amp;startTime=1972-09-26T00:00:00Z&amp;cursor=1" hreflang="en-US" type="application/atom+xml" rel="first" />
  <ns0:link href="https://wiki.earthdata.nasa.gov/display/echo/Open+Search+API+release+information" hreflang="en-US" type="text/html" rel="describedBy" title="Release Notes" />
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  <ns2:totalResults>85064</ns2:totalResults>
  <ns2:itemsPerPage>10</ns2:itemsPerPage>
  <ns2:startIndex>1</ns2:startIndex>
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      <ns3:inherited />
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      <ns3:inherited />
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    <dc:date>2019-04-17T23:03:08.000Z/2019-04-17T23:10:25.000Z</dc:date>
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Available Granule Search Parameters#

Request
Parameter		 Description Value & Cardinality
(M) = mandatory
(O) = optional 		Type
datasetIdCollection identifier(M) Allowed value is IDN collection ID cwic:datasetId
geoBoxReturned granules will have a spatial extent overlapping this bounding box (O) Supported formats are in W,S,E,N
coordinate order:
W: WestBoundingLongitude
S: SouthBoundingLatitude
E: EastBoundingLongitude
N: NorthBoundingLatitude
All coordinates are in EPSG:4326		geo:box
timeStartReturned granules will have a temporal extent containing this start time (O) Supported formats are: 'yyyy-MM-dd', 'yyyy-MM￾ddTHH:mm:ssZ' or 'yyyy-MM-dd HH:mm:ss' time:start
timeEndReturned granules will have a temporal extent containing this end time (O) Supported formats are: 'yyyy-MM-dd', 'yyyy-MM￾ddTHH:mm:ssZ' or 'yyyy-MM-dd HH:mm:ss' time:end
startIndexStarting record number of the set of search results desired by the search client(O) Allowed value is any integer equal and greater than ‘0’.os:startIndex
countNumber of search results per page desired by the search client (O) Allowed value is any integer within the interval of [0,200]. os:count
Contents