Extraction method of slope aspect based on DEM and solar radiation in mountain area of Beijing

Yan Ming; Liu Peng-ju; Jiang Yu-hao; Zhang Ying-kai; Sun Li

doi:10.13332/j.1000-1522.20170311

Journal of Beijing Forestry University > 2018 > 40(1): 67-73. > DOI: 10.13332/j.1000-1522.20170311

Yan Ming, Liu Peng-ju, Jiang Yu-hao, Zhang Ying-kai, Sun Li. Extraction method of slope aspect based on DEM and solar radiation in mountain area of Beijing[J]. Journal of Beijing Forestry University, 2018, 40(1): 67-73. DOI: 10.13332/j.1000-1522.20170311

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Extraction method of slope aspect based on DEM and solar radiation in mountain area of Beijing

1.
Research Institute of Resource Information Techniques, Chinese Academy of Forestry, Beijing 100091, China
2.
State Forest Farm of Diaoyu, Tieling 112400, Liaoning, China

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Received Date: September 03, 2017
Revised Date: December 07, 2017
Published Date: December 31, 2017

Graphical Abstract

Abstract

Abstract

ObjectiveSlope aspect is an important part of site factors and is very important for terrain analysis. Calculating slope aspect based on DEM is of great significance to natural habitat analysis and geo-ecological process simulation. Terrain is so complex in mountain area that the solar radiation of slope has large differences due to terrain shading. In this paper, the method of slope aspect extraction based on DEM and solar radiation has maintained the objectivity of slope aspect calculated from DEM in mountain area. At the same time, it can be consisted with the sunny and shady slope aspects. This lays the foundation for the study of mountain meteorology, soil distribution, site conditions and suitability analysis.
MethodBased on the digital terrain analysis, a solar radiation reference model in Beijing area was established to realize an extraction method of solar radiation equivalent slope aspect, in which the model of solar radiation analysis based on DEM was applied to explore the relationship between solar radiation and slope aspect, slope degree and altitude. The standard solar radiation was calculated based on the elevation, slope degree and slope aspect of the plots, a solar radiation equivalent slope aspect was inferred with slope aspect calculated from DEM and standard solar radiation.
Result2000 plots of the forest resource survey (FRS) in Beijing mountain area were selected as the test data. The slope aspect calculated from DEM with cell size 30, 60, 90, 120, 150 and 200 m was taken as the evaluation criterion. There were 1 398 plots of which the difference between solar radiation and standard solar radiation was less than 5%, which accounted for 69.9% of the whole plots. The slope aspect of these plots can be calculated from the 30 m DEM. Terrain shading had a larger impact on 602 plots. According to the calculation of solar radiation reference model, the solar radiation equivalent slope aspect of 583 plots was consistent with the evaluation criterion.
ConclusionThe consistency analysis with evaluation criterion showed that the consistency of the solar radiation equivalent slope aspect in the test data reached 99.05%, while the consistency of the FRS slope aspect in the test data was 72.05%. Therefore, the proposed method of solar radiation equivalent slope aspect can reflect the influence of terrain shading based on this method, the extraction of the aspect was scientific and practical, so that a new and more objective method for calculating aspect was provided for the research and production practice of the forest resource survey and site conditions.
- digital terrain analysis,
- slope aspect division,
- solar radiation,
- reference model of solar radiation

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References

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Extraction method of slope aspect based on DEM and solar radiation in mountain area of Beijing