N: 10.355 S: 8.927 E: -122.151 W: -129.131
Description
The SPURS-2 X-band marine navigation radar image dataset was collected from the ship during both the 2016 and 2017 cruises. The dataset consists of screenshots of rain echoes captured directly from the science-use X-band marine navigation radar. Raw data could not be saved. The screenshots show qualitative (uncalibrated) echoes of backscatter from rain. For full details on the screenshots, how they should be used, and what they show about rainfall, please refer to our publication: Thompson, E.J., W.E. Asher, A.T. Jessup, and K. Drushka. 2019. High-Resolution Rain Maps from an X-band Marine Radar and Their Use in Understanding Ocean Freshening. Oceanography 32(2):58–65, https://doi.org/10.5670/oceanog.2019.213 . The SPURS (Salinity Processes in the Upper Ocean Regional Study) project is a NASA-funded oceanographic process study and associated field program that aims to elucidate key mechanisms responsible for near-surface salinity variations in the oceans.
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Variables
The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | Description | Units | Data Type | Fill Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|
| azimuth | This is radar azimuth angle relative to true north. | degrees | double | -9999 | 0 to 360 | 1 |
| dlat | degrees lat from ship | degrees | double | -9999 | -0.2 to 0.2 | 1 |
| dlon | degrees lon from ship | degrees | double | -9999 | -0.2 to 0.2 | 1 |
| dship_degrees | degrees from ship | degrees | double | -9999 | 0 to 0.3 | 1 |
| dship_distance | meters from ship | m | double | -9999 | 0 to 25000 | 1 |
| dx | distance in x direction from ship | m | double | -99999 | -16000 to 16000 | 1 |
| dy | distance in y direction from ship | m | double | -99999 | -16000 to 16000 | 1 |
| heading | ship heading | degrees | double | -9999 | 0 to 360 | 1 |
| latitude | latitude of measurement | degrees_north | double | N/A | -90 to 90 | 1 |
| longitude | longitude of measurement | degrees_east | double | N/A | -180 to 180 | 1 |
| radar_backscatter | Radr backscatter intensity (integer from 0 to 5) from X-band marine radar aboard R/V Roger Revelle | 1 | double | -9999 | 0 to 5 | 1 |
| ship_latitude | ship latitude | degrees_north | double | N/A | -90 to 90 | 1 |
| ship_longitude | ship longitude | degrees_east | double | N/A | -180 to 180 | 1 |
| SOG | ship speed | knots | double | -9999 | 0 to 15 | 1 |
| time | time of measurement | seconds since 1970-01-01T00:00:00Z | double | N/A | N/A | 1 |