%0 Dataset
%T A long series surface freeze-thaw dataset of China - a dual indicator algorithm (1978-2015)
%J National Cryosphere Desert Data Center
%I National Cryosphere Desert Data Center(www.ncdc.ac.cn)
%U http://www.ncdc.ac.cn/portal/metadata/1ad24155-42b8-42a0-9825-d4268182271d
%W NCDC
%R 10.12072/ncdc.westdc.db3784.2023
%A Jin rui
%K Dual indicator algorithm;freeze-thaw
%X This dataset uses SMMR (1978-1987), SSM/I (1987-2009) and SSMIS (2009-2015) day-by-day bright temperature data, generated by a dual-indicator (TB,37v, SG) freeze-thaw discrimination algorithm, and the classification results contain four types of frozen land surface, melting land surface, desert and water bodies. The data cover the main part of mainland China, with a spatial resolution of 25.067525 km, in EASE-Grid projection and stored in ASCIIGRID format. All ASCII files in this dataset can be opened directly with a text program (e.g. Notepad). Apart from the header file, the main content is a numerical representation of the state of freezing and thawing of ground: 1 for freezing, 2 for melting, 3 for desert and 4 for precipitation. To display this graphically, we recommend using ArcView + 3D or the Spatial Analyst extension to read it, which generates a grid format file during the reading process. Reading method: [1] Add the 3D or Spatial Analyst extension to the ArcView software and create a new View; [2] Activate the View, click on the File menu, select the Import Data Source option, the Import Data Source selection box will pop up, select ASCII Raster in the Select import file type: box, a dialog box to select the source ASCII file will pop up automatically, click on Find Click on Find any ASCII file in the dataset, and then press OK;[3] In the Output Grid dialog box type in the name of the Grid file (it is recommended to use a meaningful file name so that you can view it yourself later) and click on the path where this Grid file is stored, press Ok again and then press Yes (to select integer data) and Yes (to bring the generated grid file into the current view). The resulting file can be edited for properties according to the Grid file standard. This completes the process of displaying the ASCII file into a Grid file. [4] For batch processing, you can use ARCINFO's ASCIIGRID command, write it as an AML file, and then use the Run command to complete it in the G