基于MOD13Q1的蒙古国植被物候数据集（2001-2019）

蒙古国是蒙古高原的重要组成部分，是全球生态环境变化的重要响应区域。基于TIMESAT平台，运用MOD13Q1产品中的归一化植被指数（NDVI）数据，利用动态阈值法获取蒙古国植被物候参数信息，即春天NDVI值达到上升过程中NDVI变化振幅的50%时，判定植物进入返青期；秋天NDVI值下降至NDVI变化振幅的55%时，判定植物进入枯黄期。生长季长度即植被从返青期到枯黄期的天数。数据结果表明，2001-2019年，蒙古国多年平均的植被生长季长度为90-207 d。数据集内容包括2001-2019年逐年和多年平均的蒙古国植被返青期（SOS）、植被枯黄期（EOS）和植被生长季长度（LOS）的数据。数据集空间分辨率为250 m，存储为.tif格式，由60个数据文件组成，数据量为944 MB（压缩为3个文件，844 MB）。基于该数据集的研究论文发表在《地理研究》2021年40卷11期。

Mongolia, an important part of the Mongolian Plateau, is a key responsive region to global eco-environmental changes. Based on the TIMESAT platform and using Normalized Difference Vegetation Index (NDVI) data from the MOD13Q1 product, vegetation phenology parameters of Mongolia were extracted via the dynamic threshold method. Specifically, the start of growing season (SOS) is determined when the spring NDVI value reaches 50% of the amplitude of NDVI changes during the ascending phase, while the end of growing season (EOS) is identified when the autumn NDVI value drops to 55% of the amplitude of NDVI changes during the descending phase. The length of growing season (LOS) refers to the number of days between SOS and EOS. Statistical results indicate that the multi-year average LOS of Mongolia from 2001 to 2019 ranged from 90 to 207 days. The dataset contains annual and multi-year average data of SOS, EOS and LOS of Mongolia over the period 2001–2019. It has a spatial resolution of 250 m, stored in .tif format, consisting of 60 data files with a total uncompressed size of 944 MB (compressed into 3 files with a size of 844 MB). Research papers based on this dataset have been published in *Geographical Research*, Volume 40, Issue 11, 2021.

搜集汇总

背景与挑战

背景概述

该数据集提供了2001-2019年蒙古国植被物候参数信息，包括植被返青期、黄枯期和生长季长度，空间分辨率为250米。研究显示蒙古国植被生长季平均长度为90-207天，数据基于MOD13Q1 NDVI产品，采用动态阈值法提取，对研究全球生态环境变化具有重要意义。