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首页> 外文期刊>ISPRS International Journal of Geo-Information >An Efficient Vector-Raster Overlay Algorithm for High-Accuracy and High-Efficiency Surface Area Calculations of Irregularly Shaped Land Use Patches
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An Efficient Vector-Raster Overlay Algorithm for High-Accuracy and High-Efficiency Surface Area Calculations of Irregularly Shaped Land Use Patches

机译：用于不规则形状土地利用斑块的高精度和高效表面积计算的高效矢量栅格叠加算法

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摘要

The Earth’s surface is uneven, and conventional area calculation methods are based on the assumption that the projection plane area can be obtained without considering the actual undulation of the Earth’s surface and by simplifying the Earth’s shape to be a standard ellipsoid. However, the true surface area is important for investigating and evaluating land resources. In this study, the authors propose a new method based on an efficient vector-raster overlay algorithm (VROA-based method) to calculate the surface areas of irregularly shaped land use patches. In this method, a surface area raster file is first generated based on the raster-based digital elevation model (raster-based DEM). Then, a vector-raster overlay algorithm (VROA) is used that considers the precise clipping of raster cells using the vector polygon boundary. Xiantao City, Luotian County, and the Shennongjia Forestry District, which are representative of a plain landform, a hilly topography, and a mountain landscape, respectively, are selected to calculate the surface area. Compared with a traditional method based on triangulated irregular networks (TIN-based method), our method significantly reduces the processing time. In addition, our method effectively improves the accuracy compared with another traditional method based on raster-based DEM (raster-based method). Therefore, the method satisfies the requirements of large-scale engineering applications.
机译：地球表面是不平坦的，传统的面积计算方法基于这样的假设：无需考虑地球表面的实际起伏即可获得投影平面的面积，并且将地球的形状简化为标准的椭圆形。但是，真正的表面积对于调查和评估土地资源很重要。在这项研究中，作者提出了一种基于有效矢量栅格叠加算法（基于VROA的方法）的新方法，可以计算不规则形状的土地利用斑块的表面积。在这种方法中，首先基于基于栅格的数字高程模型（基于栅格的DEM）生成表面积栅格文件。然后，使用矢量栅格覆盖算法（VROA），该算法考虑了使用矢量多边形边界对栅格像元进行精确裁剪的情况。选择分别代表平原地貌，丘陵地貌和山地景观的仙桃市，罗田县和神农架林区来计算表面积。与基于三角不规则网络的传统方法（基于TIN的方法）相比，我们的方法显着减少了处理时间。此外，与另一种基于栅格的DEM（基于栅格的方法）的传统方法相比，我们的方法有效地提高了准确性。因此，该方法满足了大规模工程应用的要求。

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