Long-term Surface Soil Freeze-thaw States Dataset of China Using the Dual-index Algorithm (1978-2015)

This dataset uses daily temperature data from SMMR (1978-1987), SSM/I (1987-2009) and SSMIS (2009-2015). It is generated by the dual-index (TB, 37v, SG) freeze-thaw discrimination algorithm. The classification results include the frozen surface, the thawed surface, the deserts and water bodies. The data coverage is the main part of China’s mainland, with a spatial resolution of 25.067525 km via the EASE-Grid projection method, and it is stored in ASCIIGRID format.

All the ASCII files in this data set can be opened directly with a text program such as Notepad. Except for the head file, the body content is numerically characterized by the freeze/thaw status of the surface soil: 1 for frozen, 2 for thawed, 3 for desert, and 4 for precipitation. If you want to use the icon for display, we recommend using the ArcView + 3D or Spatial Analyst extension module for reading; in the process of reading, a grid format file will be generated, and the displayed grid file is the graphical expression of the ASCII file. The read method comprises the following.

[1] Add the 3D or Spatial Analyst extension module to the ArcView software and then create a new View.

[2] Activate View, click File menu, and select the Import Data Source option. When the Import Data Source selection box pops up, select ASCII Raster in the Select import file type box. When the dialog box for selecting the source ASCII file automatically pops up, click to find any ASCII file in the data set, and then press OK.

[3] Type the name of the Grid file in the Output Grid dialog box (it is recommended that a meaningful file name is used for later viewing) and click the path to store the Grid file, press OK again, and then press Yes (to select integer data) and Yes (to put the generated grid file into the current view). The generated files can be edited according to the Grid file standard. This completes the process of displaying an ASCII file into a Grid file.

[4] In the batch processing, the ASCIGRID command of ARCINFO can be used to write AML files, and then use the Run command to complete the process in the Grid module:


The production of this data is supported by the following Natural Science Foundation Projects: Environmental and Ecological Science Data Center of West China (90502010), Land Data Assimilation System of West China (90202014) and Active and Passive Microwave Radiation Transmission Simulation and Radiation Scattering Characteristics of the Frozen Soil (41071226).

Required Data Citation View Data Cite Help About Data Citation

1. Xie, Y.M., Jin, R, & Yang, X.G. (2013). Algorithm development of monitoring daily near surface freeze/thaw cycles using amsr-e brightness temperatures. Remote Sensing Technology and Application, 28(2).( View Details | Download )

Cite the data

JIN Rui. Long-term Surface Soil Freeze-thaw States Dataset of China Using the Dual-index Algorithm (1978-2015). Big Data System for Pan-Third Pole, 2011. doi: 10.11888/Geocry.tpdc.270029. (Download the reference: RIS | Bibtex )

Using this data, you must reference article references listed in the Required Data Citation and reference data

User Limit

To respect the intellectual property rights, protect the rights of data authors, expand services 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. The results published in Chinese can be indicated by the following specifications: Data from the Heihe Plan Data Management Center (http://westdc.westgis.ac.cn). The results published in English can be indicated by the following specifications: The data set is provided by Cold and Arid Regions Sciences Data Center at Lanzhou (http://westdc.westgis.ac.cn).

License: This work is licensed under a Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)

Related Resources

1. 2019-08-15 天津城建大学 李沛航 Usage:科学研究


Sign In to add comments

Geographic Coverage
Spatial Coverage





  • Format: ASCII Grid
  • File size: 1210.0 MB
  • View count:5688 Times
  • Share type: online
  • Time Range: 1978-10-28 To 2015-12-31
  • Updated Time:2019-08-09
Immediately download Add to Data Cart
Contact Information

Data Resource Provider: JIN Rui  

Distributor: Observational & Big Data Center for Three Poles

Contact: data@itpcas.ac.cn

Export metadata