Optimization of interpolation parameters when deriving DEM from contour lines

Abstract

Digital elevation models (DEMs) are still an important and current source of information for digital soil mapping and the modeling of soil processes. The grid DEM is often interpolated from contour lines. The contour sampling step becomes an additional interpolation parameter which can play an important role. The objective of this paper is to optimize the interpolation parameters of the Regularized spline with tension (RST) method, in order to prepare a DEM suitable as an input for erosion modeling. Two contrasting cases, with and without a reference DEM, were investigated. If a reference DEM was available, good results of interpolation were reached both by small and larger sampling steps. In the second case, it was found that small sampling steps should be avoided. The influence of the sampling was demonstrated by topographic potential for erosion and deposition.

Spatial interpolation of regional PM2.5 concentrations in China during COVID-19 incorporating multivariate data

“…The TSF is a simple and fast radial basis function-based interpolation method that yields the advantage that the range of the estimated dimensions is not limited. The fundamental principle of the tension spline function can be expressed as follows ( Schweikert et al, 1965 ; Bek and Jezek, 2011 ). where is the interpolation result, is the trend function, is the number of points in the interpolation area, is the coefficient obtained by solving the system of linear equations, is the distance from point to the th point, is the weight parameter, is the modified Bessel function, and is a constant ( ).…”

Digital elevation model cell size effect on erosion‐deposition simulation using the unit stream power erosion and deposition model in the dry‐hot valley region of Southwest China

“…where R is the rainfall erosivity index, in MJÁmmÁha À1 Áh À1 ; K is the soil erodibility index, in metric tonsÁhÁMJ À1 Ámm À1 ; C and P are the cover management and support practice factors, respectively, in dimensionless units (Pistocchi et al, 2002); A is the upslope contributing area, in m 2 (Bek & Ježek, 2011;Mitasova et al, 1996b;Pistocchi et al, 2002).…”

“…The precision of the DEM, namely the DEM cell size, used in the analysis directly affects the accuracy of the LS factor and subsequently impacts the overall accuracy of simulation results based on the USPED model (Bek & Ježek, 2011;Garcia Rodriguez & Gimenez Suarez, 2012;Mitasova et al, 1996a). Indeed, some studies have highlighted the importance of DEM cell size in determining the accuracy of the L and S factors.…”

Dem空间插值方法对土壤侵蚀模拟的影响研究——以usped分析干热河谷典型冲沟为例

“…USPED 是一个在降雨量稳定、 挟沙力有限的状 态下， 预测地表径流侵蚀过程中侵蚀和沉积速率和 空间分布状况模型 (Mitasova et al, 1996;Mitas et al, 1998)。USPED 是基于 USLE 和 RUSLE 模型改进而 得 (Pistocchi et al, 2002;Bek et al, 2011) Liu J G. 2003. Evolution of soil erosion models in China [J]. Progress in [J].…”