CYGNSS Level 3 MRG Science Data Record Near Real Time Version 3.2

(CYGNSS_L3_MRG_NRT_V3.2)

Information
Coverage
Data Access
Variables
Documentation
Citation
Version History

Version	3.2
Processing Level	3
Start/Stop Date	2023-Jul-21 to Present
Short Name	CYGNSS_L3_MRG_NRT_V3.2
Description	This dataset contains the version 3.2 CYGNSS Level 3 Merged (MRG) Science Data Record Near Real Time (NRT) Storm Wind Speed derived from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. It combines CYGNSS storm-centric gridded (SCG) wind speeds, which are derived from the L2 Young Seas Limited Fetch (YSLF) winds for a region surrounding a given tropical cyclone (TC), with L2 Fully Developed Seas (FDS) winds away from the TC center on a 0.2x0.2 degree latitude by longitude equirectangular grid. L3 MRG is a product which combines the L2 FDS and YSLF winds and eliminates the need to choose between them depending on sea state development and the proximity to storms. The data are provided in netCDF-4 format and starts from the June 11, 2024 through the present with an approximate latency between 2 and 24 hours . A tapered weighted averaging scheme is used centered on the 34-knot wind radius (R34) of the storm. The R34 value in each storm quadrant is also reported. The algorithm produces global (+/- 40 deg latitude) wind speeds reported on a 0.1x0.1 deg grid every 6 hours for each tropical cyclone, although some 6-hourly increments may be missing if there are an insufficient number of satellite overpasses of the storm during that time interval. The netCDF files are output on a storm-by-storm basis. The CYGNSS is a NASA Earth System Science Pathfinder Mission that is intended to collect the first frequent space‐based measurements of surface wind speeds in the inner core of tropical cyclones. Made up of a constellation of eight micro-satellites, the observatories provide nearly gap-free Earth coverage using an orbital inclination of approximately 35° from the equator, with a mean (i.e., average) revisit time of seven hours and a median revisit time of three hours. This inclination allows CYGNSS to measure ocean surface winds between approximately 38° N and 38° S latitude. This range includes the critical latitude band for tropical cyclone formation and movement
DOI	10.5067/CYGNS-L3N32
Measurement	OCEANS > OCEAN WINDS > SURFACE WINDS OCEANS > OCEAN WINDS > SURFACE WINDS
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: 2024-Aug-08 Resource: https://cygnss.engin.umich.edu/
Format	netCDF-4
Keyword(s)	cygnss, ddm, ddmi, doppler, delay doppler, delay, specular point, wind, winds, wind speed, MRG, NRT, near real time, version 3.2, v3.2

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

Resolution Spatial Resolution: 0.2 Decimal Degrees x 0.2 Decimal Degrees Temporal Resolution: Hourly - < Daily Coverage North Bounding Coordinate: 40 degrees South Bounding Coordinate: -40 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2023-Jul-21 to Present Projection Ellipsoid: WGS 84

DIRECT ACCESS
Browse Granule Listing
https://cmr.earthdata.nasa.gov/virtual-directory/collections/C3051555827-POCLOUD
Search Granules
https://search.earthdata.nasa.gov/search/granules?p=C3051555827-POCLOUD
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_L3_MRG_NRT_V3.2/
podaac-ops-cumulus-public/CYGNSS_L3_MRG_NRT_V3.2/
AWS S3 Credentials
Get AWS S3 Credentials \| Documentation

Name	Long Name	Unit
best_track_r34_ne	Radial extent of 34 knot winds in north east from Best Track	km
best_track_r34_nw	Radial extent of 34 knot winds in north west from Best Track	km
best_track_r34_se	Radial extent of 34 knot winds in south east from Best Track	km
best_track_r34_sw	Radial extent of 34 knot winds in south west from Best Track	km
best_track_storm_center_lat	Storm center latitude	degrees_north
best_track_storm_center_lon	Storm center longitude	degrees_east
best_track_storm_status	Storm status	1
best_track_vmax	Maximum sustained wind speed	m s-1
cygnss_r34_ne	Radial extent of 34 knot winds in north east from CYGNSS	km
cygnss_r34_nw	Radial extent of 34 knot winds in north west from CYGNSS	km
cygnss_r34_se	Radial extent of 34 knot winds in south east from CYGNSS	km
cygnss_r34_sw	Radial extent of 34 knot winds in south west from CYGNSS	km
cygnss_vmax_lat	Storm V max latitude	degrees_north
cygnss_vmax_lon	Storm V max longitude	degrees_east
epoch_time	Time Centering of Data Based on Epoch Reference	hours since 2018-08-01 00:00:00.000000000
lat	Latitude	degrees_north
lon	Longitude	degrees_east
merge_method	Merge method	1
quality_flags	Per-time step quality flags
range_corr_gain	Range Corrected Gain	1e-27 dBi meter-4
time	Reference time of file	hours since 2023-07-21 06:00:00.000000000
time_offset	Time offset of each sample from center time	hours
wind_speed	Wind speed	m s-1
wind_speed_uncertainty	Wind speed uncertainty	m s-1

DATA RECIPE
https://github.com/podaac/data-readers Generic Data Readers
GENERAL DOCUMENTATION
https://cygnss.engin.umich.edu/ CYGNSS Mission Page at University of Michigan
DATA CITATION POLICY
https://podaac.jpl.nasa.gov/CitingPODAAC Data Use and Citation Policy
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L3/docs/148-0412_L3_MRG_ATBD_R5.pdf Level 3 Merged Gridded Wind Speed Algorithm Theoretical Basis Document
DATA PRODUCT SPECIFICATION
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L3/docs/148-0408-2_Level_3_Merged_Storm_netCDF_Data_Dictionary.xlsx CYGNSS L3 MRG V3.2 netCDF Data Dictionary
USER'S GUIDE
https://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/06/CYGNSS_Handbook_April2016.pdf Deriving Surface Winds from Tropical Cyclones
https://doi.org/10.3998/mpub.12741920 CYGNSS Handbook
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L3/docs/148-0409-1_Level_3_Merged_Storm_Storage_Scheme.pdf Level 3 Merged Storm Storage Scheme
PUBLICATIONS
https://doi.org/10.1109/TGRS.2021.3070238 Wang, T., Ruf, C. S., Gleason, S., O’Brien, A. J., McKague, D. S., Block, B. P., Russel, A. 2021. Dynamic Calibration of GPS Effective Isotropic Radiated Power for GNSS-Reflectometry Earth Remote Sensing, IEEE Trans. Geosci. Remote Sens. 10.1109/TGRS.2021.3070238.

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. 2024. CYGNSS Level 3 MRG Science Data Record Near Real Time Version 3.2. Ver. 3.2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L3N32

Download Citation
RIS	BIB	XML	JSON-LD

For more information see Data Citations and Acknowledgments.

Journal Reference

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.. https://doi.org//10.1175/BAMS-D-14-00218.1

Ruf, C., S. Asharaf, R. Balasubramaniam, S. Gleason, T. Lang, D. McKague, D. Twigg, and D. Waliser. 2019. In-Orbit Performance of the Constellation of CYGNSS Hurricane Satellites, Bull. Amer. Meteor. Soc., 100. https://doi.org//10.1175/BAMS-D-18-0337.1

Gleason, S., M. M. Al-Khaldi, C. Ruf, D. S. McKague, T. Wang, A. Russel. 2021. Characterizing and Mitigating Digital Sampling Effects on the CYGNSS Level 1 Calibration, IEEE Trans. Geosci. Remote Sens.. https://doi.org//10.1109/TGRS.2021.3120026

Pascual, D., M. P. Clarizia, C. S. Ruf. 2021. Improved CYGNSS Wind Speed Retrieval Using Significant Wave Height Correction, Remote Sensing. https://doi.org//10.3390/rs13214313

Wang, T., Ruf, C. S., Gleason, S., O’Brien, A. J., McKague, D. S., Block, B. P., Russel, A.. 2021. Dynamic Calibration of GPS Effective Isotropic Radiated Power for GNSS-Reflectometry Earth Remote Sensing, IEEE Trans. Geosci. Remote Sens.. https://doi.org//10.1109/TGRS.2021.3070238

Mayers, D. R., C. S. Ruf, A. M. Warnock. 2024. CYGNSS Storm-Centric Tropical Cyclone Gridded Wind Speed Product, J. Appl. Meteor. Climatol.. https://doi.org//10.1175/JAMC-D-22-0054.1

Ruf, C., D. McKague, D. Posselt, S. Gleason, M.P. Clarizia, V. Zavorotny, T. Butler, J. Redfern, W. Wells, M. Morris, J. Crespo, C. Chew, E. Small, D. Pasqual, T. Wang, A. Warnock, D. Mayers, M. Al-Khaldi, A. O’Brien. 2022. CYGNSS Handbook (2nd ed.), Michigan Publishing Services, Ann Arbor, MI, ISBN 978-1-60785-549-1. https://doi.org/10.3998/mpub.12741920

Version	Dataset	Version Date	Status
3.2.1	CYGNSS Level 3 MRG Science Data Record Near Real Time Version 3.2.1	2024-07-21	ACTIVE	2024-07-21T02:31:00.000Z
3.2	CYGNSS Level 3 MRG Science Data Record Near Real Time Version 3.2	2024-06-01	ACTIVE	2024-06-01T01:42:00.000Z

Cloud Enabled

Status:

ACTIVE

Short Name:

CYGNSS_L3_MRG_NRT_V3.2

Collection Concept ID:

C3051555827-POCLOUD

Spatial Coverage:

N: 40°

S: -40°

E: 180°

W: -180°

Access:

Capabilities:

Tools

PO.DAAC Data Subscriber

Information


                        Simple: podaac-data-downloader -c CYGNSS_L3_MRG_NRT_V3.2 -d ./data --start-date 2023-07-21T00:00:00Z --end-date 2023-07-28T00:00:00Z -e ""
Download by Spatial and Temporal Search: podaac-data-downloader -c CYGNSS_L3_MRG_NRT_V3.2 -d ./data --start-date 2023-07-21T00:00:00Z --end-date 2023-07-28T00:00:00Z -b="-180,-40,180,40"
Download by Extension: podaac-data-downloader -c CYGNSS_L3_MRG_NRT_V3.2 -d ./data --start-date 2023-07-21T00:00:00Z --end-date 2023-07-28T00:00:00Z -e .nc
Download recent data (360 min.): podaac-data-subscriber -c CYGNSS_L3_MRG_NRT_V3.2 -d ./data -m 360
Download recent data (1440 min.): podaac-data-subscriber -c CYGNSS_L3_MRG_NRT_V3.2 -d ./data -m 1440

Services

PO.DAAC harmony-netcdf-to-zarr

Information


                        https://harmony.earthdata.nasa.gov/C3051555827-POCLOUD/ogc-api-coverages/1.0.0/collections/all/coverage/rangeset?format=application%2Fx-zarr

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_L3_MRG_NRT_V3.2/

podaac-ops-cumulus-public/CYGNSS_L3_MRG_NRT_V3.2/

AWS S3 Credentials

Get AWS S3 Credentials | Documentation

Data Recipes:

Generic Data Readers

Navigation

You are here

CYGNSS Level 3 MRG Science Data Record Near Real Time Version 3.2

CYGNSS Level 3 MRG Science Data Record Near Real Time Version 3.2

Share Dataset URL

Tools

Services

Direct S3-Access

Services

Services