Global near-surface soil freeze/thaw state (2002-2019)

The freezing / thawing state of near surface soil represents the dormancy and activity of land surface processes. This alternation of freezing and thawing phases can cause a series of complex surface process trajectory mode mutations, and affect the water cycle processes such as soil hydrothermal characteristics, surface runoff and groundwater recharge, and also affect climate change through water and energy cycle mechanism.

This data set is based on AMSR-E and amsr2 passive microwave data, using discriminant algorithm to prepare global near earth surface freeze-thaw state (spatial resolution: 0.25 °; time span: 2002-2019), data storage type: 8-bit unsigned integer (file type:. HDF5) 5) Among them: 0: water body and missing data; 1: frozen soil; 2: thawed soil; 3: precipitation; 15: perennial snow and ice sheet.

It can be used to analyze the spatial distribution and trend of the global freeze-thaw cycle, such as the start / end date, freezing / thawing duration, freezing range and other indicators. It can provide data support for understanding the interaction mechanism between land surface freeze-thaw cycle and water and energy exchange process under the background of global change.

For detailed naming and missing of data, please refer to the data description.

Data file naming and use method

The file name is to be of the following structure:
Each of the elements is as follows:
XXXX: 4 characters, Name of satellite sensor (AMSR represents AMSR-E or AMSR2)
YYYY: 4 characters, Year
MM: 2 characters, Month
DD: 2 characters, Day
PP: 2 characters, Name of the product (FT represents freeze/thaw status)
RR: 2 characters, Spatial resolution of data grids (0.25°)

Example: AMSR_20070125_FT_0.25.h5 represents the AMSR-E/2 sensors derived near-surface freeze-thaw status on January 25, 2007 with the grid spatial resolution at 0.25 degree.

Required Data Citation View Data Cite Help About Data Citation
Cite as:

Global near-surface soil freeze/thaw state (2002-2019). National Tibetan Plateau Data Center, 2018. doi: 10.11888/Glacio.tpdc.270890. (Download the reference: RIS | Bibtex )

Using this data, the data citation is required to be referenced and the related literatures are suggested to be cited.

Support Program

CASEarth:Big Earth Data for Three Poles(grant No. XDA19070000) (No:XDA19000000)

User Limit

To respect the intellectual property rights, protect the rights of data authors,expand servglacials of the data center, and evaluate the application potential of data, data users should clearly indicate the source of the data and the author of the data in the research results generated by using the data (including published papers, articles, data products, and unpublished research reports, data products and other results). For re-posting (second or multiple releases) data, the author must also indicate the source of the original data.

Example of acknowledgement statement is included below: The data set is provided by National Tibetan Plateau Data Center (

License: This work is licensed under an Attribution 4.0 International (CC BY 4.0)

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Geographic coverage
East: 180.00 West: -180.00
South: -90.00 North: 90.00
  • Temporal resolution: Yearly
  • Spatial resolution: 0.25º - 0.5º
  • File size: 233 MB
  • Browse count: 2,706 Times
  • Apply count: 21 Times
  • Share mode: online
  • Temporal coverage: 2002-01-15 To 2020-01-14
  • Updated time: 2019-08-01
Contact Information
: Zhao Tianjie  

Distributor: National Tibetan Plateau Data Center


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