Google Earth Engine(GEE)——全球长期微波植被光学深度气候档案(VODCA)

全球长期微波植被光学深度气候档案(VODCA)
植被光学深度(VOD)描述了植物对辐射的衰减情况。VOD是频率以及植被含水量的函数,并延伸到生物量。VOD在生物圈研究中有许多可能的应用,如生物量监测、干旱监测、物候学分析或火灾风险管理。我们合并了来自各种空间传感器(SSM/I、TMI、AMSR-E、AMSR2、WindSat)的VOD观测数据,以建立全球长期VOD时间序列。在汇总之前,数据已经按照AMSR-E进行了重新标定,消除了它们之间的系统差异。

有一个C波段(~6.9 GHz,2002 - 2018)、X波段(10.7 GHz,1997 - 2018)和Ku波段(~19 GHz,1987 - 2017)的产品。数据是在0.25度的常规网格上进行全球采样。

VODCA文件中的数据变量:

VOD:无单位,各波段的植被光学深度
sensor_flag:Bit-flag,表示哪个传感器对每个观测的贡献。
值:
1 = AMSR-E
2 = AMSR2
3 = SSM/I F8
4 = SSM/I F11
5 = SSM/I F13
6 = TMI
7 = WindSat
processing_flag:表示处理过程中影响观测质量的不正常情况的位标志
值:
0 = 一切正常
10 = 使用 AMSR-2 7.3 GHz 频段,而不是 6.9 GHz
11 = 传感器的比例与TMI相匹配,而不是AMSR-E
12 = 传感器的比例没有时间上的重叠观测值
免责声明:数据集的全部或部分描述是由作者或其作品提供的。

数据集预处理
数据集以压缩的NetCDF文件形式提供,其中包括VOD、传感器标志和处理标志的子数据集。包括子数据集在内的数据集被导出为单独的tif文件,然后按VOD、传感器标志和处理标志的频带顺序进行堆叠。

Bands Band Name Unit
b1 VOD Unitless
b2 Sensor Flag Refer to variable description
b3 Processing Flag Refer to variable description

Dataset citation

Moesinger, Leander, Dorigo, Wouter, De Jeu, Richard, Van der Schalie, Robin, Scanlon, Tracy, Teubner, Irene, & Forkel, Matthias. (2019).
The Global Long-term Microwave Vegetation Optical Depth Climate Archive VODCA (1.0) [Data set].
Zenodo. https://doi.org/10.5281/zenodo.2575599

Paper Citation

Moesinger, Leander, Wouter Dorigo, Richard de Jeu, Robin van der Schalie, Tracy Scanlon, Irene Teubner, and Matthias Forkel.
"The global long-term microwave vegetation optical depth climate archive (VODCA)." Earth System Science Data 12, no. 1 (2020): 177-196.

Earth Engine Snippet

var cband = ee.ImageCollection("projects/sat-io/open-datasets/VODCA/C-BAND");
var kband = ee.ImageCollection("projects/sat-io/open-datasets/VODCA/K-BAND");
var xband = ee.ImageCollection("projects/sat-io/open-datasets/VODCA/X-BAND");

Sample Code: https://code.earthengine.google.com/?scriptPath=users/sat-io/awesome-gee-catalog-examples:agriculture-vegetation-forestry/VODCA

License

This work is licensed under a Creative Commons Attribution 4.0 International License. You are free to copy and redistribute the material in any medium or format, and to transform and build upon the material for any purpose, even commercially. You must give appropriate credit, provide a link to the license, and indicate if changes were made.

Created by : Moesinger, Leander, Wouter Dorigo, Richard de Jeu, Robin van der Schalie, Tracy Scanlon, Irene Teubner, and Matthias Forkel

Curated in GEE by: Samapriya Roy

Keywords: VOD, Vegetation Optical Depth, Biomass, Vegetation water content, Microwave Remote Sensing, Biosphere, Time Series, global, vegetation

Last updated : 2023-01-19

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转载自blog.csdn.net/qq_31988139/article/details/130377587