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I'm exploring the CMR Search API. I'm using a keyword search restricting data to ORNL DAAC data, returning results in json format.

All of the entries have a score = 0.5. Am I using the query wrong? Or is there a deeper problem?

Here's the query I'm using:

https://cmr.earthdata.nasa.gov/search/collections.json?keyword=above&data_center=ORNL_DAAC&sort_key[]=%2Bscore&sort_key[]=-start_date&pretty=true&offset=0&page_size=10

Here is the first entry as an example:

    "entry" : [ {
      "time_start" : "2014-08-10T00:00:00.000Z",
      "score" : 0.5,
      "boxes" : [ "68.4 -149.5 69.15 -148.7" ],
      "online_access_flag" : true,
      "id" : "C1000000540-ORNL_DAAC",
      "browse_flag" : false,
      "summary" : "This data set includes estimates of permafrost Active Layer Thickness (ALT; cm), and calculated uncertainties, derived using a ground-penetrating radar (GPR) system in the field in August 2014 near Toolik Lake and Happy Valley on the North Slope of Alaska. GPR measurements were taken along 10 transects of varying length (approx. 1 to 7 km). Traditional ALT estimates from mechanical probing every 100 to 500 m along each transect are also included. These data are suitable for future studies of how ALT varies over relatively large geological features, such as hills and valleys, wetland areas, and drained lake basins.",
      "time_end" : "2014-08-15T00:00:00.000Z",
      "coordinate_system" : "CARTESIAN",
      "original_format" : "ECHO10",
      "processing_level_id" : "3",
      "data_center" : "ORNL_DAAC",
      "archive_center" : "ORNL_DAAC",
      "links" : [ {
        "rel" : "http://esipfed.org/ns/fedsearch/1.1/data#",
        "hreflang" : "en-US",
        "href" : "https://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1265"
      }, {
        "rel" : "http://esipfed.org/ns/fedsearch/1.1/metadata#",
        "hreflang" : "en-US",
        "href" : "https://daac.ornl.gov/ABOVE/guides/ReSALT_ALT_GPR.html"
      } ],
      "dataset_id" : "Pre-ABoVE: Ground-penetrating Radar Measurements of ALT on the Alaska North Slope",
      "title" : "Pre-ABoVE: Ground-penetrating Radar Measurements of ALT on the Alaska North Slope",
      "organizations" : [ "ORNL_DAAC" ],
      "short_name" : "doi:10.3334/ORNLDAAC/1265",
      "updated" : "2015-09-25T00:00:00.000Z",
      "orbit_parameters" : { },
      "version_id" : "1"
    },