CYGNSS Level 1 Full Delay Doppler Map Data Record

(CYGNSS_L1_FULL_DDM)

Information
Coverage
Data Access
Documentation
Citation
Version History

Version	1.0
Processing Level	1
Start/Stop Date	2017-Aug-19 to 2020-Nov-17
Short Name	CYGNSS_L1_FULL_DDM
Description	This Level 1 (L1) dataset contains the 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.
DOI	10.5067/CYGNS-L1FDD
Measurement	SPECTRAL/ENGINEERING > RADAR > SENSOR COUNTS
Swath Width	25 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-Aug-21 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

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

Resolution Spatial Resolution: 25 km (Along) x 25 km (Across) 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: 2017-Aug-19 to 2020-Nov-17 Granule Time Span: 2017-Aug-19 to 2020-Nov-17 Swath Width: 25 km Projection Projection Type: Satellite native along-track Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84

DIRECT ACCESS
Browse Granule Listing
https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2036882030-POCLOUD HTTPS endpoint for data browse and download
Search Granules
https://search.earthdata.nasa.gov/search/granules?p=C2036882030-POCLOUD Browse granule search results in Earthdata Search
DIRECT S3-ACCESS
Available for access in-region with AWS Cloud
Region
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/
podaac-ops-cumulus-public/CYGNSS_L1_FULL_DDM/
AWS S3 Credentials
Get AWS S3 Credentials \| Documentation

ANOMALIES
https://podaac.jpl.nasa.gov/forum/viewtopic.php?f=16&t=1261 Forum Post Capturing Changes to CYGNSS Sampling Rate
https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/docs/att_tables/ Updated Monthly
USER'S GUIDE
https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/docs/148-0373_Full_DDM_netCDF_Data_Dictionary.xlsx Level 1 Full DDM netCDF Data Dictionary
https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/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://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/sw/CYGNSS_DDM_Processor_MakefileBuild.pdf Describes the software workflow in processing the Full DDMs
DATA RECIPE
https://github.com/podaac/data-readers Generic Data Readers
https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/sw/makefile_build_c C Source code for Makefile build to process Full DDMs
GENERAL DOCUMENTATION
https://cygnss.engin.umich.edu/ CYGNSS Mission Page at University of Michigan
http://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/07/148-0136_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
http://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/07/148-0137_ATBD-L1B-DDM-Calibration_R3_release.pdf Level 1B DDM Calibration Algorithm Theoretical Basis Document, S. Gleason, CYGNSS Project Document 148-0137, Rev 2, 20 Aug. 2018.
PUBLICATIONS
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.
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.
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. Ver. 1.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L1FDD

Download Citation
RIS	XML	JSON-LD

For more information see Data Citations and Acknowledgments.

Journal Reference

Gleason, S., Ruf, C. S., O'Brien, A. J., McKague, D. S. . 2019. The CYGNSS Level 1 Calibration Algorithm and Error Analysis Based On On-Orbit Measurements., IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 12, 1. 10.1109/JSTARS.2018.2832981

Version	Dataset	Version Date	Status
1.0	CYGNSS Level 1 Full Delay Doppler Map Data Record	2020-07-24	ACTIVE	2020-07-24T22:15:33.586Z
3.0	CYGNSS Level 1 Full Delay Doppler Map Data Record Version 3.0	2020-11-13	ACTIVE	2020-11-13T22:11:45.282Z

Cloud Enabled

Status:

ACTIVE

Short Name:

CYGNSS_L1_FULL_DDM

Collection Concept ID:

C2036882030-POCLOUD

Spatial Coverage:

N: 40°

S: -40°

E: 180°

W: -180°

Access:

Capabilities:

Download Subset

Data Recipes:

Navigation

You are here

CYGNSS Level 1 Full Delay Doppler Map Data Record

CYGNSS Level 1 Full Delay Doppler Map Data Record

Share Dataset URL

Tools

Direct S3-Access

Services