Skip to main content

Description

This dataset provides the in-situ measurements from a Pressure-sensing Inverted Echo Sounder (PIES) deployed by the SWOT prelaunch field campaign. The campaign was designed to test the performance of several instruments/platforms in meeting the SWOT Calibration/Validation (CalVal) requirement. It was conducted near the SWOT CalVal crossover location, about 300 kilometers west of Monterey, California between September, 2019 and January, 2020. The campaign also deployed three CTD moorings, a slocum glider, and another bottom pressure recorder. The PIES measurements include bottom pressure and the round-trip travel time from the IES, which can be used to derive equivalent steric height through regression. Details can be found in the user guide and the journal reference given in the documentation section.

Product Summary

Platforms
MOORINGS
Instruments
BOTTOM PRESSURE GAUGES
Spatial Extent

N: 36.2 S: 35.8 E: -125 W: -125.2

Geographic Region
PACIFIC OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2019-09-06 to 2020-01-18
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC)
Concept ID
C2229635776-POCLOUD
Data State
COMPLETE
Number of Files/Granules
1
Processing Level
2
Published
Science Keywords
Ocean Temperature ,
Salinity/Density ,
Ocean Pressure

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

SWOT. (2022). SWOT 2019-2020 Prelaunch Oceanography Field Campaign SIO Pressure-sensing Inverted Echo Sounder (PIES) [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/SWTPR-PIES1 Date Accessed: 2025-12-16

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
ACOUSTIC_TRAVEL_TIME See separate QC flags to identify good/bad data points. s double -9.9 0 to 10 1
ACOUSTIC_TRAVEL_TIME_QC This quality control flag describes the data that link here through the ancillary_variables attribute. N/A byte N/A 0 to 8 1
DEPTH Depth estimated from average pressure data, with standard atmospheric pressure subtracted. m double -9.9 0 to 12000 1
LATITUDE LATITUDE degrees_north double -99.9 -90 to 90 1
LONGITUDE LONGITUDE degrees_east double -999.9 -180 to 180 1
SEAFLOOR_PRESSURE Atmospheric pressure and tides are still included in these data. See separate QC flags to identify good/bad data points. See bounds in time variable to understand what periods the data are averaged over. dbar double -9.9 0 to 12000 1
SEAFLOOR_PRESSURE_QC This quality control flag describes the data that link here through the ancillary_variables attribute. N/A byte N/A 0 to 8 1
TIMEP Data represent averages over the periods listed in the 'bounds' variable. A linear clock drift has been subtracted, based on the following: True time was 06-Sep-2019 00:00:00 at instrument time 06-Sep-2019 00:00:00. True time was 05-Feb-2020 20:43:30 at instrument time 05-Feb-2020 20:43:14. days since 19500101T000000Z double -9.9 0 to 90000 1
TIMEP_BOUNDS TIMEP_BOUNDS N/A double -9.9 N/A 1
TIMET A linear clock drift has been subtracted, based on the following: True time was 06-Sep-2019 00:00:00 at instrument time 06-Sep-2019 00:00:00. True time was 05-Feb-2020 20:43:30 at instrument time 05-Feb-2020 20:43:14. days since 19500101T000000Z double -9.9 0 to 90000 1
You're viewing 10 of 10