基于变点分析法提取地势起伏度——以青藏高原为例
作者简介:韩海辉(1983-),男,青海西宁人,助理工程师,研究方向为遥感与GIS应用。E-mail:hanhh06@hotmail.com
收稿日期: 2010-11-04
要求修回日期: 2011-03-08
网络出版日期: 2012-01-20
基金资助
中国地质调查局项目“西昆仑成矿带矿产资源遥感综合调查(西安地调中心)(基[2010]矿评03-04-02)”资助
Extraction of Relief Amplitude Based on Change Point Method: A Case Study on the Tibetan Plateau
Received date: 2010-11-04
Request revised date: 2011-03-08
Online published: 2012-01-20
Copyright
韩海辉 , 高婷 , 易欢 , 杨敏 , 阎晓娟 , 任广利 , 杨军录 . 基于变点分析法提取地势起伏度——以青藏高原为例[J]. 地理科学, 2012 , 32(1) : 101 -104 . DOI: 10.13249/j.cnki.sgs.2012.01.101
Choosing scientific method to extract and express relief amplitude has become the critical factor to improve the effectiveness and practicality in relief research. Based on SRTM3-DEM, the relief amplitude with increasing grid window method in the Tibetan Plateau was extracted, and then the best window area by the mean change point method was calculated. The result shows that 1.17km2 could be the best window area, the relief amplitude can be divided into eight classes, and the most widely distributed class is low rolling mountain. The relief amplitude is generally more violent at the edge of the plateau. It is mainly due to the intensive tectonic movement and river headward erosion. While the terrain is relatively flat in hinterland of the plateau, the erosion and removal caused by glaciation and unfreezing may be the greater impact on the relief amplitude.
Key words: change point method; relief amplitude; Tibetan Plateau
Fig.1 Location of the study region图1 研究区地理位置 |
Table 1 Relation between grid units and average relief amplitude in the study region表1 研究区网格单元与平均地势起伏度对应关系 |
网格 大小 2×2 | 面积 (104m2) 3.24 | 平均地势 起伏度(m) 32.63 | 网格 大小 13×13 | 面积 (104m2) 136.89 | 平均地势 起伏度(m) 273.38 | 网格 大小 24×24 | 面积 (104m2) 466.56 | 平均地势 起伏度(m) 422.13 |
---|---|---|---|---|---|---|---|---|
3×3 | 7.29 | 62.4 | 14×14 | 158.76 | 289.31 | 25×25 | 506.25 | 433.42 |
4×4 | 12.96 | 89.78 | 15×15 | 182.25 | 304.65 | 26×26 | 547.56 | 444.44 |
5×5 | 20.25 | 115.2 | 16×16 | 207.36 | 319.43 | 27×27 | 590.49 | 455.19 |
6×6 | 29.16 | 138.97 | 17×17 | 234.09 | 333.71 | 28×28 | 635.04 | 465.7 |
7×7 | 39.69 | 161.3 | 18×18 | 262.44 | 347.51 | 29×29 | 681.21 | 475.98 |
8×8 | 51.84 | 182.38 | 19×19 | 292.41 | 360.88 | 30×30 | 729 | 486.03 |
9×9 | 65.61 | 202.36 | 20×20 | 324 | 373.84 | 31×31 | 778.41 | 495.88 |
10×10 | 81 | 221.35 | 21×21 | 357.21 | 386.42 | 32×32 | 829.44 | 505.52 |
11×11 | 98.01 | 239.46 | 22×22 | 392.04 | 398.65 | |||
12×12 | 116.64 | 256.78 | 23×23 | 428.49 | 410.54 |
Fig.2 Fitting curve of the relation between grid units and average relief amplitude图2 平均地势起伏度与网格单元面积对应关系拟合曲线 |
Table 2 Statistics of mean change point analysis result表2 均值变点分析的统计结果 |
i | Si | i | Si | i | Si |
---|---|---|---|---|---|
2 | 16.7112 | 12 | 5.1759 | 22 | 10.0873 |
3 | 13.8485 | 13 | 5.2652 | 23 | 10.9251 |
4 | 11.5338 | 14 | 5.4723 | 24 | 11.8040 |
5 | 9.7018 | 15 | 5.7836 | 25 | 12.7204 |
6 | 8.2723 | 16 | 6.1875 | 26 | 13.6711 |
7 | 7.1779 | 17 | 6.6743 | 27 | 14.6532 |
8 | 6.3644 | 18 | 7.2354 | 28 | 15.6642 |
9 | 5.7888 | 19 | 7.8634 | 29 | 16.7016 |
10 | 5.4166 | 20 | 8.5517 | 30 | 17.7633 |
11 | 5.2200 | 21 | 9.2947 | 31 | 18.8473 |
Fig.3 Change curve of the difference value between S and Si图3 S和Si差值的变化曲线 |
Fig.4 Classification of relief amplitude of Tibetan Plateau图4 青藏高原地势起伏度分级 |
The authors have declared that no competing interests exist.
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