基于DEM的阳江农场地形特征信息提取与分析

Extraction and Analysis on Terrain Features of Yangjiang Farm Based on DEM

文章以ArcG IS 9.2为软件平台,以阳江农场1∶50 000地形图为基础生成水平栅格分辨率为25 m的DEM,并提取了部分宏观和微观地形因子进行分析。结果表明,阳江农场属于低海拔地区,主要以平坦地形为主,大部分地区地表粗糙度及高程变异系数较小;大部分土地资源较好,南、北坡向的土地面积略有差异,研究区地表起伏不大,且多为平坡,应注重对地力进行维护,防止水土及养分流失;应进一步研究栅格图最佳分辨率,以提高地形因子分析精度;有必要结合实际调查状况,对相应地貌特征处理结果进行客观分析。

The present study is an attempt to get raster DEM of which horizontal resolution was 25m from 1∶50000 topographic map of Yangjiang Farm.Based on the raster DEM of Yangjiang Farm,the part of macro and micro terrain factors were extracted and analyzed.The results showed that Yangjiang Farm was in low-altitude area and mainly dominated by flat terrain with smaller ground roughness and variation coefficient of elevation.The most of land resources were found to be well and there was a little differences between the land area of south-facing slope and north-facing slope.The slopes in Yangjiang Farm were almost gentle.Therefore,the soil productivity should be maintained to prevent the water and soil losing.Further,the optimal resolution ratio of raster DEM should be figured out to refine the analysis on the terrain factors and raise its accuracy.And the analysis on the terrain factors of Yangjiang Farm was necessary combined with its actual investigation.