HDF5-group-of-groups
The NASA Measures Freeze/Thaw ESDR is a long-term global 25KM daily freeze thaw state dataset.
NASA_Measures_Freeze_Thaw
F/T edition 5.1
2016-11-07
Kim  Y.  J. S. Kimball and J. Glassy. 2016. MEaSUREs Global Record of Daily Landscape Freeze/Thaw Status Version 5.1 [1979 to 2023]. Boulder Colorado USA: National Snow and Ice Data Center. Digital media (http://dx.doi.org/10.5067/MEASURES/CRYOSPHERE/nsidc-0477.004).
F/T codes for ESDR domain extent are (0 1 2 3 ) with all other pixels outside F/T domain
0   -- Frozen (AM/PM frozen) RGB{0 0 255) in color images
1   -- Thawed (AM/PM thawed) RGB{255 0 0) in color images
2   -- Transitional (AM frozen and PM thawed) RGB{168 168 0) in color images
3   -- Inverse Transitional (PM frozen and AM thawed) RGB{76 230 0) in color images
252 -- No data defined. RGB{255 255 255} in color images
253 -- non-cold constraint area RGB{200 200 200} in color images
254 -- 100 Percent open water RGB{255 255 255} in color images
255 -- Fillvalue RGB{255 255 255} in color images
Definition of the Freeze Thaw v5 pixel-wise classification by instr-year-Overpass-DayOfYear combination.
AM refers to morning overpass
CO refers to combined morning and afternoon overpass
PM refers to afternoon overpass
0:Brightness temperatures (Tb) were NOT interpolated and 1: Tb WAS interpolated for this pixel.
0:Open water fraction of pixel is less than or equal to 20%; and 1: Open water fraction is >20% for this pixel/day.
0:Elevation Gradient less than or equal to 300m for this pixel; and 1: Large elevation gradient >300m for this pixel.
0:NO large precip event occurred on this pixel/day; and 1: Large precip event DID OCCUR on this pixel/day.
v1
./AMSRE
v1
Version 5.1
NASA MEASURES FREEZE THAW Metadata Version 5.1
./SMMR
v1
./SSMI
v1
V5.1
FREEZE_THAW_Algorithm_Version_5.1
NSIDC-TBD
2009-07-03
NASA MEaSUREs: Making Earth System Data Records for Use in Research Environments (NNH06ZDA001N) An Earth System Data Record for Land Surface Freeze/Thaw State
2023-03-27
ft_qc
directInternal
Percent of F/T domain lacking a valid QC classification
Percent of Missing Data
Percent
0
directInternal
Percent of F/T QC domain falling within a predefined acceptable range of measure.
Percent of F/T QC data that are within the acceptable range.
Percent
100.0
ft_status
directInternal
Percent of F/T domain lacking a F/T classification
Percent of Missing Data
Percent
0
directInternal
Percent of F/T domain falling within a predefined acceptable range of measure.
Percent of F/T status data that are within the acceptable range.
Percent
100.0
FreezeThaw_status
An HDF5 product that contains statistical information on data product results. These statistics enable data producers and users to assess the quality of the data in the data product granule.
2025-03-04T09:04:01.581129
@MACRO
v5.1
1356af32-0dc8-11e7-8ef0-2fc36935f400
This NASA Freeze Thaw Earth Science Data Record (ESDR) version 5.1 global data 25km resolution product applies to the 1979-2023 extended earth science data record.
v5.1
The NASA Measures Freeze/Thaw status data product provides global daily freeze thaw status at 25 km resolution.
utf8
2025-03-04T09:04:01.581129
The software that generates the Freeze/Thaw data product was developed by the University of Montana Numerical Terradynamic Simulation Group (NTSG) and was transferred to the NASA data archive (DAAC) facility at the National Snow and Ice Data Center for public access.
SSMI_37V_AM_FT_2022_day001.h5
english
NASA Measures Freeze Thaw Daily 25km global freeze thaw status 1979-2023
Numerical Terradynamic Simulation Group (NTSG)  University of Montana  Missoula MT. USA
The Freeze Thaw status data product provides spatially and temporally complete Freeze Thaw status information from 1979-2023 at a daily resolution globally at 25 km for science and applications users.
FREEZE-THAW
onGoing
geoscientificInformation
1979-2023
2023
global
25km
1979
NASA Measures Freeze Thaw global daily dataset
daily
5.1
NASA Measures Freeze Thaw domain TBD-describe here
179.999994 86.716744
86.716744
2025-03-04T09:04:01.581129
2025-03-04T09:04:01.581129
-86.716744
-179.999994 86.716744
-1.8E-6 -4.3E-6
-1.7334193538E7 -7344784.825
1.7334193537E7 -7344784.825
meters
-1.7334193538E7 7344784.825
1.7334193537E7 7344784.825
0.0 0.0
179.999994 86.716744
-179.999994 86.716744
179.999994 -86.716744
-179.999994 -86.716744
decimal_degrees
EASEGRID v1.0 by NSIDC
EASEGRID
meters
v1.0
varies-by-latitude
25 km on average
varies-by-longitude
25 km on average
1383
25 km on average
586
25 km on average
2009-07-03
NASA MEaSUREs: Making Earth System Data Records for Use in Research Environments (NNH06ZDA001N) An Earth System Data Record for Land Surface Freeze/Thaw State
v1
v1.7.9-2017-07-24T10:00-07:00
Freeze Thaw daily global status at 25km resolution for 1979-2023
umt-FREEZE-THAW-v4_0
2009-07-03
2009-07-03
NASA MEaSUREs: Making Earth System Data Records for Use in Research Environments (NNH06ZDA001N) An Earth System Data Record for Land Surface Freeze/Thaw State
2.45154e+06
2000-01-01T11:58:55.816Z
FT_post-processor-software (Python v3.7)
Freeze Thaw status uses {SSMI SMMR AMSR-E AMSR2} data within a daily global model to generate spatially complete and temporally continuous estimates of freeze thaw state at 25km.
Numerical Terradynamic Simulation Group (NTSG)  University of Montana
001
37V
SSMI
AM
2022
v1.8-2023-03-27T05:17:00-07:00
Freeze Thaw status post-processor software  ft_postproc.py
2025-03-04T09:04:01.581137
J2000
v5.2
N/A
ft_status
Youngwook Kim  John S. Kimball Joseph Glassy
http://dx.doi.org/10.5067/MEASURES/CRYOSPHERE/nsidc-0477.004
v4
2016-03-31
A Global Data Record of Daily Landscape Freeze/Thaw status Version 5.1
V5.2
The NASA Measures Freeze Thaw earth science data record (1979-2023) provides spatially and temporally explicit landscape freeze thaw state retrievals for science and applications users.
utf8
The software that generates the NASA Freeze/Thaw data product is the property of the University of Montana Numerical Terradynamic Simulation Group (NTSG) and was transferred to the NASA data archice (DAAC) facility at the National Snow and Ice Data Center for public access. 
HDF5
HDF5-Version-1.10.6
dx.doi.org/10.5067
english
NASA Measures Freeze/Thaw Earth Science Data Record (ESDR) daily global 25km resolution freeze thaw status classification for 1979-2023
As-Needed
2025-01-15
NASA Measures Earth Science Data Record (ESDR) Freeze Thaw status
National Snow and Ice Data Center Boulder Colorado USA; and Univ. Montana NTSG
The NASA Measures Freeze Thaw earth science data record (1979-2023) provides spatially and temporally explicit landscape freeze thaw state retrievals for science and applications users.
National Aeronautics and Space Administration
2025-01-15
Freeze-Thaw
on-going
geo-scientific-Information
N/A
2016-10-27T14:45:00-07:00
Freeze Thaw cell latitude bin-center 586x1383 reference binary float32 image
ft_cell_lat.h5
FT_CELL_LAT
v5.1
N/A
2016-10-27T14:45:00-07:00
Freeze Thaw cell longitude bin-center 586x1383 reference binary float32 image
ft_cell_lon.h5
FT_CELL_LON
v5.1
http://dx.doi.org/10.5067/36SLCSCZU7N6
2000-01-01
SMMR -- Nimbus-7 SMMR Pathfinder Daily EASE-Grid Brightness Temperature
SMMR_37V series
SMMR
Knowles K. E. G. Njoku R. Armstrong and M. Brodzik. 2000. Nimbus-7 SMMR Pathfinder Daily EASE-Grid Brightness Temperatures Version 1. [Indicate subset used]. Boulder Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: http://dx.doi.org/10.5067/36SLCSCZU7N6.
http://nsidc.org/data/nsidc-0071
v1
http://dx.doi.org/10.5067/3EX2U1DV3434
1994 updated 2023
SSMI
SSMI_37V series
SSMI radiometer
Armstrong  R.  K. Knowles  M. Brodzik  and M. A. Hardman. 1994  updated 2016. DMSP SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness Temperatures  Version 2. [Indicate subset used]. Boulder  Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: http://dx.doi.org/10.5067/3EX2U1DV3434
http://nsidc.org/data/nsidc-0032
v1
10.1117/12.977774
2016-10-27
AMSR2 L1R Version 2.1
AMSR2 radar series
AMSR2 TB series
Imaoka  K.; Takashi  M.; Misako  K.; Marehito  K.; Norimasa  I.; Keizo  N. (2012). Status of AMSR2 instrument on GCOM-W1  earth observing missions and sensors: Development  implementation  and characterization II. Proc. SPIE 2012  852815
TBD
L1R Version 2.1
http://dx.doi.org/10.5067/XIMNXRTQVMOX.
2006-01-01
AMSR
AMSR series
AMSR microwave
Knowles K. M. Savoie R. Armstrong and M. Brodzik. 2006. AMSR-E/Aqua Daily EASE-Grid Brightness Temperatures Version 1. [Indicate subset used]. Boulder Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: http://dx.doi.org/10.5067/XIMNXRTQVMOX.
http://nsidc.org/data/nsidc-0071
v1
cell_lat: F/T coordinate variable for NS latitude axis
cell_lat
decimal degrees
86.716744
-86.716744
cell_lon: F/T coordinate variable for EW longitude axis
cell_lon
decimal degrees
179.86985778
-179.86985778
255
{0: 0, 1: 0, 2: 25225, 3: 25225}

LEGEND_QC_BIT_0 : INTERP 0: Brightness temperatures (Tb) WERE NOT interpolated, and 1: Tb WERE INTERPOLATED for this pixel.
LEGEND_QC_BIT_1 : OWF    0: Open water fraction of pixel is less than or equal to 20%; and 1: Open water fraction is >20% for this pixel/day.
LEGEND_QC_BIT_2 : LEG    0: Large Elevation Gradient less than or equal to 300m this pixel; and 1: Large elevation gradient >300m this pixel/day.
LEGEND_QC_BIT_3 : PRECIP 0: NO Large precip event occurred this pixel/day; and 1: Large precip event DID OCCUR this pixel/day.
LEGEND_QC_BIT_DESCRIPTION : Definition of how the daily, pixel-wise Freeze Thaw QC (0|1) bit values, for bits (0-3), are defined in an 8-bit QC word.
ft_qc
ft_qc
bitfield-boolean(0|1)
1
0
255
{254: 564976, 0: 102838, 1: 45544, 253: 97080}

LEGEND_FT_STATUS_000 : 0 is Frozen (AM/PM frozen) RGB{0,0,255) in color images
LEGEND_FT_STATUS_001 : 1 is Thawed (AM/PM thawed) RGB{255,0,0) in color images
LEGEND_FT_STATUS_002 : 2 is Transitional (AM frozen and PM thawed) RGB{168,168,0) in color images
LEGEND_FT_STATUS_003 : 3 is Inverse Transitional  (PM frozen and AM thawed) RGB{76,230,0) in color images
LEGEND_FT_STATUS_252 : 252 no data RGB{255,255,255} in color images in color images
LEGEND_FT_STATUS_253 : 253 non-cold constraint area RGB{200,200,200} in color images
LEGEND_FT_STATUS_254 : 254 is 100 Percent open water RGB{255,255,255} in color images
LEGEND_FT_STATUS_255 : 255 is Fillvalue RGB{255,255,255} in color images
LEGEND_FT_STATUS_DESCRIPTION : Definition of the Freeze Thaw Vers 4 pixel classification by instr-year-Overpass-DayOfYear combination.
LEGEND_FT_STATUS_DOMAIN : F/T codes for ESDR domain extent are (0,1,2,3) with all other pixels outside F/T domain
ft_status
254
ft_status
dimensionless
254
0