西北干旱区三工河1：10万土地盐碱化土地数据集(1985、1998、2006、2010年)

此数据集包括三工河流域1985、1998、2006、2010年盐渍化土地数据，数据文件有： （1）sgh1985 （2）sgh1998 （3）sgh2006 （4）sgh2010 遥感数据处理时以几何纠正后的1：10万栅格地形图为地理基础，对2000年的Landsat ETM进行精纠正。其它时期影像采用与ETM影像匹配的方法进行纠正。对遥感图像制备主要包括精纠正处理与分县图像镶嵌；一景影像内选取30-40个控制点并且尽量均匀分布，并用二次多项式进行重采样。1975 MSS图像、1990、2005和2010年的TM图像以纠正后的2000ETM图像为基础完成几何校正，纠正时每景图像内选取7*8个控制点，并且尽量分布均匀，利用二次多项式建立纠正模型，图像重采样方法采用最邻近值法。This dataset contains salinized land data of the Sangong River Basin for the years 1985, 1998, 2006 and 2010. The data files are: (1) sgh1985; (2) sgh1998; (3) sgh2006; (4) sgh2010. For remote sensing data processing, precision correction was conducted on the 2000 Landsat ETM image using the geometrically corrected 1:100,000 scale raster topographic map as the geographic base. Images from other periods were corrected via matching with the ETM image. Remote sensing image preprocessing mainly includes precision correction and county-based image mosaicking: For each single scene, 30 to 40 control points were selected and distributed as evenly as possible, with resampling performed using a quadratic polynomial model. The 1975 MSS images, as well as the TM images from 1990, 2005 and 2010, were geometrically corrected based on the corrected 2000 ETM image. During correction, 7×8 control points were selected within each scene and distributed as evenly as possible, a correction model was established using the quadratic polynomial, and the nearest neighbor method was adopted for image resampling.

搜集汇总

背景与挑战

背景概述

该数据集提供了中国西北干旱区三工河流域1985年、1998年、2006年和2010年四个时间点的土地盐碱化数据，比例尺为1:10万，基于Landsat遥感影像经几何校正处理生成。它主要用于研究该区域土地盐碱化的时空变化规律，服务于地球科学和沙漠荒漠化防治领域，数据可通过国家冰川冻土沙漠科学数据中心完全共享获取。