1970-2000年青藏高原东南部雅弄冰川高程变化

根据不同源的冰川区的相关地形数据的特点，利用所建立的冰川高程提取方法进行冰川区高程数据的提取。技术路线主要包括：（1）冰川高程变化提取：基于Matlab的数字图像处理平台，开发一套集KH-9畸变光标精确识别、影像畸变校正、影像无缝拼接等功能的KH-9影像预处理程序，实现KH-9影像的自动化预处理，并在此基础上对预处理后的KH-9立体像对提取研究区冰川1970年的DEM数据，然后结合SRTM数据，利用多源高程差值校正方法，通过Matlab编程实现DEMs的配准和高程相关偏差改正，最后计算冰川1970—2000年间的冰川高程变化；（2）基于ICEsat数据进行冰川高程变化提取：首先利用NSIDC提供的IDL Readers tool 工具将GLA14二进制格式数据转换为ASCII 文本数据，然后通过Matlab编程对其进行饱和改正和坡度、云层误差剔除后处理，并利用多源高程差值校正方法，实现ICEsat和SRTM数据的配准和高程相关偏差改正，最后利用年变化趋势回归拟合方法来获取冰川2003—2009年间的高程变化；（3） 根据两种不同类型的冰川地形数据进行冰川高程变化的提取。

According to the topographic data characteristics of glacier regions from different sources, the established glacier elevation extraction method is employed to derive elevation data for glacier regions. The technical workflow mainly includes:
(1) Glacier elevation change extraction: Based on the Matlab digital image processing platform, a KH-9 image preprocessing program integrating functions such as accurate recognition of KH-9 distorted cursors, image distortion correction, and seamless image mosaicking is developed to achieve automated preprocessing of KH-9 imagery. On this basis, the 1970 DEM data of glaciers in the study area is extracted from the preprocessed KH-9 stereo image pairs. Then, combined with SRTM data, the multi-source elevation difference correction method is utilized, and the registration of DEMs and correction of elevation-related biases are implemented via Matlab programming. Finally, the glacier elevation change between 1970 and 2000 is calculated.
(2) Glacier elevation change extraction based on ICESat data: First, the GLA14 binary format data is converted to ASCII text data using the IDL Readers tool provided by NSIDC. Subsequently, post-processing operations including saturation correction, slope and cloud error elimination are conducted through Matlab programming. The multi-source elevation difference correction method is applied to realize the registration of ICESat and SRTM data and the correction of elevation-related biases. Finally, the glacier elevation change from 2003 to 2009 is obtained through the annual change trend regression fitting method.
(3) Glacier elevation change extraction using two distinct types of glacier topographic data.

搜集汇总

背景与挑战

背景概述

该数据集提供了1970-2000年间青藏高原东南部雅弄冰川的高程变化数据，基于KH-9影像和ICEsat数据，通过数字图像处理和Matlab编程技术提取。数据格式为GeoTiff栅格，适用于冰川高程变化研究。