高精度DEM数据支持下的田坎系数测算方法研究与典型应用

Study and Typical Application of the Calculation Method of the Field Ridge Coefficient Supported by Highprecision DEM

摘要:

本文基于山东省基础测绘最新的高精度DEM、坡度图、第三次国土调查0.5m数字正射影像及第二次土地调查田坎系数测算资料，重新选取样方测算了山东省的田坎系数。结果表明：耕地田坎系数与耕地类型、地貌类型之间存在一定规律性，鲁东丘陵区和鲁中南山区同坡度级坡地田坎系数均高于梯田田坎系数，鲁东丘陵区梯田和坡地的田坎系数均高于鲁中南山区的田坎系数。较第二次土地调查田坎系数、第三次国土调查田坎系数总体呈下降的趋势。根据第三次国土调查数据统计，山东省田坎面积约占耕地总面积的3.5%，依然有较大的挖潜潜力。研究结果可为国土调查、耕地保护、粮食面积估算等工作提供重要参考。

Abstract:

Based on the latest highprecision DEM, slope map, 0.5m digital orthophoto image of the third land survey and the measurement data of ridge coefficient in the second land survey of Shandong province, through reselecting samples, the ridge coefficient in Shandong province has been measured. It is showed that there is a certain regularity between the ridge coefficient of cultivated land and the types of cultivated land and landforms. The ridge coefficient of slopes with the same slope grade in the hilly region of eastern Shandong and the mountainous region of central and southern Shandong province is higher than that of terraced fields, and the ridge coefficient of terraced fields and slopes in the hilly region of eastern Shandong province is higher than that in the mountainous region of central and southern Shandong. Comparing with the ridge coefficient of the second land survey, the ridge coefficient of the third land survey generally shows a downward trend. According to the statistics of the third national land survey, the farmland area in Shandong province accounts for about 3.5% of the total cultivated land area. It still has great potential. It can provide important references for land survey, farmland protection and grain area estimation.