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针对大范围建筑物高度信息的提取精度低且速度慢的问题,提出利用GOOGLE Sketch Up模型法,模拟沈阳市2014-09-22T10∶30∶00不同位置、不同高度的建筑及阴影,对此情况下基于阴影长度法测算的建筑高度误差变化规律进行研究。结果表明:测试点经度变化或纬度变化时,建筑高度测算误差都随着与中心样本点的距离增加而增大,且误差随纬度变化的幅度大于随经度变化;测试点经纬度同时变化,建筑高度测算误差随着与中心样本点的距离增加而增大,且沿西北—东南方向变化幅度大于沿东北—西南方向;同一位置,测算误差随建筑高度增加而增大。研究结果对提高阴影长度法的精度以及快速准确获取大范围建筑物高度信息等研究有参考价值。
Aiming at the problem of low accuracy and slow speed of extracting building height information in a wide range of buildings, this paper proposes the use of GOOGLE Sketch Up model method to simulate Shenyang 2014-09-22T10:30:00 Buildings and shades of different positions and different heights, Under the shadow length method to calculate the height of the building changes in the law of error were studied. The results show that when the test point changes in longitude or latitude, the error in building height increases with the distance from the center sample point, and the error changes with latitude more than the longitude; the latitude and longitude of the test point change at the same time, the building height The calculation error increases with the distance from the center sample point, and the change range from northwest to southeast is greater than that along the northeast-southwest direction; the same position, the calculation error increases with the increase of building height. The research results have reference value for improving the accuracy of the shadow length method and obtaining the height information of a wide range of buildings quickly and accurately.