基于CASS和ArcGIS的新月形沙丘属性参数提取

doi:10.7522/j.issn.1000-694X.2017.00056

摘要/Abstract

摘要： 在塔克拉玛干沙漠腹地选取新月形沙丘演变监测区，运用华测X90 GNSS接收机RTK工作模式，获取精度达毫米级的沙丘表面高时空分辨率三维坐标，应用地藉成图软件CASS 9.0和地理信息数据分析软件ArcGIS 10.0对三维坐标数据进行处理，提取新月形沙丘的坡长、坡角、高度、宽度、脊线长度、两翼距离和夹角、体积、表面积和投影面积、坡度坡向等属性信息数据，多期监测数据叠加分析，求算沙丘侵蚀堆积量、移动速度和移动方向等沙丘演变信息。结果表明：在第1次和第2次监测期间，代表性新月形沙丘处于堆积增大状态，堆积量51.4 m³，移动速度16.0 m·a^-1左右，移动方向226°45'，沙丘移动方向与主风向NE一致。基于CASS和ArcGIS的新月形沙丘属性参数提取，是量化研究沙丘形态演变过程和位置迁移动态、明确沙丘演变中各属性参数间数值关系的有效途径。

关键词: 塔克拉玛干沙漠, 新月形沙丘, 三维坐标测量, DEM, 属性信息提取

Abstract: Selecting the monitoring area of the barchan dune evolution in the hinterland of Taklimakan Desert, we get high temporal resolution three-dimensional coordinate data of the dune surface with a precision of millimeter using the RTK working mode of Huace X90 GNSS receiver. With the help of the geological mapping software CASS 9.0 and the geographic data analysis software ArcGIS 10.0, we try to perform three-dimensional coordinate data processing and extract the data of attribute information of the barchan dune, such as slope length, slope angle, height, width, ridge length, distance between two wings and included angle, volume, dune surface area and projection area, slope and aspect, etc. Experiencing a multi-period overlay analysis of monitoring data, we are able to calculate erosion/acumulation, movement speed and direction, and other information data of the sand dune evolution. The results show that the typical barchan dunes are in the state of accumulation between the first and the second monitoring period, the accumulation is 51.4 m³, the moving speed is about 16.0 m·a^-1 and the direction is 226°45', the movement direction is consistent with the main wind direction (NE) in this area. Attributive parameter extraction of the barchan dune based on CASS and ArcGIS is an effective way to quantitatively study the morphological evolution process and location migration dynamics of the dune, and to clarify the numerical relationships among the attribute parameters during the sand dune evolution process.

Key words: Taklimakan Desert, barchan dune, three-dimensional coordinate measurement, DEM, attributive information extraction

中图分类号:

P931.3

李爱敏, 韩致文, 钟帅, 郭彩赟. 基于CASS和ArcGIS的新月形沙丘属性参数提取[J]. 中国沙漠, 2018, 38(3): 484-491.

Li Aimin, Han Zhiwen, Zhong Shuai, Guo Caiyun. Attributive Parameter Extraction of the Barchan Dune Based on CASS and ArcGIS[J]. Journal of Desert Research, 2018, 38(3): 484-491.

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