CYGNSS Level 1 Full Delay Doppler Map Data Record Version 3.0

(CYGNSS_L1_FULL_DDM_V3.0)

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Version History

Version	3.0
Processing Level	1
Start/Stop Date	2018-Aug-06 to Present
Short Name	CYGNSS_L1_FULL_DDM_V3.0
Description	This Level 1 (L1) dataset contains the Version 3.0 (v3.0) Full Delay Doppler Map (DDM) sensor data from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. The primary CYGNSS instrument, also known as the Delay-Doppler Mapping Instrument (DDMI), measures the incoming radio frequency (RF) streams from three input antenna channels (2 nadir oriented science antennas and one zenith oriented navigation antenna) and processes them in real time into DDMs, which are two-dimensional maps of the signal scattered from the Earth surface as a function of propagation time delay and Doppler frequency shift. DDMs are normally sampled over a restricted range of delay and Doppler values centered on the values at the specular point of reflection. The bit resolution of scattered signal strength is also truncated by a lossy data compression algorithm. Full DDMs are sampled over a wider range of delay and Doppler values and retain their full (lossless) bit resolution. Full DDM data records are typically 10-15 min in duration and are initiated by ground commands to coincide with an overpass by one of the spacecraft of a target area of interest. This version supersedes the Full DDM Version 1.0 (https://doi.org/10.5067/CYGNS-L1FDD) for data retrieved during or after August 2018. For data retrieved prior to August 2018, users will need to continue using the Full DDM Version 1.0. This version links the Full DDMs to the CYGNSS v3.0 L1 files (https://doi.org/10.5067/CYGNS-L1X30) whereas the version 1.0 Full DDM linked the Full DDMs to the CYGNSS v2.1 L1 files (https://doi.org/10.5067/CYGNS-L1X21). The calibration of the Full DDMs has not been modified for this release.
DOI	10.5067/CYGNS-L1F30
Measurement	SPECTRAL/ENGINEERING > RADAR > SENSOR COUNTS
Swath Width	1 km
Platform/Sensor	CYGNSS Platform Name: Cyclone Global Navigation Satellite System (CYGNSS) Orbit Period: 94.0 minutes Inclination Angle: 35.0 degrees / DDMI SENSOR Name: Delay Doppler Mapping Instrument (DDMI) Swath Width: 25.0 kilometers Description: Spacecraft angular distance from orbital plane relative to the Equator.
Project	Cyclone Global Navigation Satellite System (CYGNSS)
Data Provider	Publisher: PO.DAAC Creator: CYGNSS Release Place: PO.DAAC Release Date: 2020-Nov-30 Resource: https://cygnss.engin.umich.edu/
Format	netCDF-4
Keyword(s)	cygnss, full, ddm, full ddm, doppler, delay doppler, delay, specular point, bistatic, bi-static, radar, v3.0, v3, 3.0, version 3, version 3.0

Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov

Resolution Spatial Resolution: 25000 Meters x 25000 Meters Temporal Resolution: Hourly - < Daily Coverage Region: GLOBAL North Bounding Coordinate: 40 degrees South Bounding Coordinate: -40 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2018-Aug-06 to Present Granule Time Span: 2018-Aug-06 to 2023-Nov-15 Swath Width: 1 km Projection Projection Type: Satellite native along-track Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84

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Browse Granule Listing
https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2205121474-POCLOUD
Search Granules
https://search.earthdata.nasa.gov/search/granules?p=C2205121474-POCLOUD
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Available for access in-region with AWS Cloud
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us-west-2
Bucket/Object Prefix: Protected buckets contain the data files for a given collection. Protected simply means users must log in to Earthdata Login before gaining access to contents within that S3 Bucket. Please use the S3Credential endpoint to gain an Earthdata login token for use in S3 Access. Public buckets, in contrast, house metadata such as checksums, imagery, and metadata files and the like. A user can access public buckets and these types of files without logging in to Earthdata Login. Most of the time, you'll want to access the protected bucket Information
podaac-ops-cumulus-protected/CYGNSS_L1_FULL_DDM_V3.0/
podaac-ops-cumulus-public/CYGNSS_L1_FULL_DDM_V3.0/
AWS S3 Credentials
Get AWS S3 Credentials \| Documentation
READ SOFTWARE
C Source code for Makefile build to process Full DDMs

USER'S GUIDE
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0397-1_ATBD_L1_RawIF_FullDDM.pdf Algorithm Theoretical Basis Document (ATBD) for the CYGNSS Level 1 Full DDM and Raw IF Datasets, S. Gleason, S. Musko, CYGNSS Project Document 148-0397-01, Rev 1, 22 June 2020
https://docs.google.com/spreadsheets/d/1OZ5OlQU5mnIL0_cmZhdub8dz6x4JTOTGAWqndkBptO4/edit?usp=sharing CYGNSS Targeting Information for Full DDM Data
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0373_Full_DDM_netCDF_Data_Dictionary.xlsx Level 1 Full DDM netCDF Data Dictionary
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/sw/CYGNSS_DDM_Processor_MakefileBuild.pdf Describes the software workflow in processing the Full DDMs
https://doi.org/10.3998/mpub.12741920 CYGNSS Handbook
GENERAL DOCUMENTATION
https://cygnss.engin.umich.edu/ CYGNSS Mission Page at University of Michigan
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0137_ATBD_L1B_DDMCalibration_Rev2_Aug2018_release.pdf Level 1B DDM Calibration Algorithm Theoretical Basis Document, S. Gleason, CYGNSS Project Document 148-0137, Rev 2, 20 Aug. 2018.
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/148-0136_ATBD_L1A_DDMCalibration_Rev2_Aug2018_release.pdf Level 1A DDM Calibration Algorithm Theoretical Basis Document, S. Gleason, CYGNSS Project Document 148-0136, Rev 2, 20 Aug. 2018.
https://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/06/CYGNSS_Handbook_April2016.pdf Deriving Surface Winds from Tropical Cyclones
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_1.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_2.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_3.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_4.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_5.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_6.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_7.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_8.txt Updated Monthly
ANOMALIES
https://podaac.jpl.nasa.gov/forum/viewtopic.php?f=16&t=1261 Forum Post Capturing Changes to CYGNSS Sampling Rate
DATA RECIPE
https://github.com/podaac/data-readers Generic Data Readers
PUBLICATIONS
https://doi.org/10.1109/TGRS.2015.2502245 Gleason, S., C. Ruf, M. P. Clarizia, A. O'Brien, 'Calibration and Unwrapping of the Normalized Scattering Cross Section for the Cyclone Global Navigation Satellite System (CYGNSS)', IEEE Trans. Geosci. Remote Sens., doi:10.1109/TGRS.2015.2502245, 2016.
https://journals.ametsoc.org/doi/10.1175/BAMS-D-14-00218.1 Ruf, C., R. Atlas, P. Chang, M. Clarizia, J. Garrison, S. Gleason, S. Katzberg, Z. Jelenak, J. Johnson, S. Majumdar, A. O'Brien, D. Posselt, A. Ridley, R. Rose, V. Zavorotny (2015). New Ocean Winds Satellite Mission to Probe Hurricanes and Tropical Convection. Bull. Amer. Meteor. Soc., doi:10.1175/BAMS-D-14-00218.1.
DATA CITATION POLICY
https://podaac.jpl.nasa.gov/CitingPODAAC Data Use and Citation Policy

Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.

Citation

CYGNSS. 2020. CYGNSS Level 1 Full Delay Doppler Map Data Record Version 3.0. Ver. 3.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L1F30

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For more information see Data Citations and Acknowledgments.

Journal Reference

Gleason, S., C. S. Ruf, A. O'Brien, D. S. McKague. 2018. The CYGNSS Level 1 Calibration Algorithm and Error Analysis Based On On-Orbit Measurements, IEEE J. Sel. Topics Appl. Earth Obs. Remote Sens, 12, 1. 10.1109/JSTARS.2018.2832981

Version	Dataset	Version Date	Status
3.0	CYGNSS Level 1 Full Delay Doppler Map Data Record Version 3.0	2022-04-11	ACTIVE	2022-04-11T17:14:00.000Z
1.0	CYGNSS Level 1 Full Delay Doppler Map Data Record	2021-06-23	ACTIVE	2021-06-23T18:03:00.000Z

Cloud Enabled

Status:

ACTIVE

Short Name:

CYGNSS_L1_FULL_DDM_V3.0

Collection Concept ID:

C2205121474-POCLOUD

Spatial Coverage:

N: 40°

S: -40°

E: 180°

W: -180°

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CYGNSS Level 1 Full Delay Doppler Map Data Record Version 3.0

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