| DEM上大规模空间遮挡判断方法研究 |
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| 引用本文： | 黄跃峰,李满春,刘永学,毛亮,刘伍.DEM上大规模空间遮挡判断方法研究[J].地理与地理信息科学,2005,21(1):34-37. |
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| 作者姓名： | 黄跃峰 李满春 刘永学 毛亮 刘伍 |
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| 作者单位： | 南京大学城市与资源学系,江苏,南京,210093;南京大学城市与资源学系,江苏,南京,210093;南京大学城市与资源学系,江苏,南京,210093;南京大学城市与资源学系,江苏,南京,210093;南京大学城市与资源学系,江苏,南京,210093 |
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| 基金项目： | 浙江省国土资源厅资助项目;教育部优秀青年教师资助计划 |
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| 摘 要： | 利用1：5万DEM数据，针对起伏较大的山地地形，提出基于高效空间搜索算法的日照时数计算方法。这种空间搜索算法是根据太阳位置将DEM分割成一系列平行条带，使得在某时刻可能互相遮挡的栅格都集中在一个条带内，从而缩小判断遮挡关系的遮挡范围，提高算法的效率和质量，并结合桐庐县气象站气象记录作相关分析。结果表明，模拟值和地面实测值的相关性较高，该方法能够比较精确地计算中低纬度地区复杂地形的日照时数。
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| 关 键 词： | 日照时数 DEM GIS 桐庐县 |
| 文章编号： | 1672-0504(2005)01-0034-04 |
| 修稿时间： | 2004年10月15 |
An Approach for Calculating Sunshine Hours of Mountainous Area Based on DEM |
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| HUANG Yue-feng,LI Man-chun,LIU Yong-xue,MAO Liang,LIU Wu.An Approach for Calculating Sunshine Hours of Mountainous Area Based on DEM[J].Geography and Geo-Information Science,2005,21(1):34-37. |
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| Authors: | HUANG Yue-feng LI Man-chun LIU Yong-xue MAO Liang LIU Wu |
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| Abstract: | Sunshine-hour is an important meteorological factor for agriculture.There are some traditional methods to calculate sunshine hours,but they all take lots of time and energy,especially in the mountainous areas of complex terrain.As a result,a method based on computer modulating is much more ascendant,which is discussed in this paper.Tonglu County is taken as an example to introduce a very effective arithmetic used in this method.This special arithmetic divides DEM to a number of belts may be sunned or not enabling us to spent time doing more temporal sampling and spatial sampling.In the end,the simulative value is compared with the measured value,and it is concluded that the main reason for bringing out errors is that there is too few points with real value to make regression and that there is more or less the interference of weather. |
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| Keywords: | DEM GIS |
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