A Vector Operation to Extract Second-Order Terrain Derivatives from Digital Elevation Models
Abstract
:1. Introduction
2. Methods
2.1. Calculation Principle of Second-Order Terrain Derivatives
2.2. Vectorization Expression of First-Order Terrain Derivatives
- Rotation-type judgment. Two rotation types, namely, counterclockwise (slope) and clockwise (aspect), can be observed in the directional property of first-order terrain derivatives (Figure 1). In the counterclockwise or clockwise systems, initial direction, end direction, and rotation angle consist of the aforementioned systems. These systems follow the characteristics of a polar coordinate system (Figure 2). Given the differences between counterclockwise and clockwise systems, a standard polar coordinate system corresponds to a counterclockwise directional property of first-order terrain derivatives, i.e., slope as an example in Figure 2a. By contrast, a reverse polar coordinate system corresponds to a clockwise directional property of first-order terrain derivatives, i.e., aspect as an example in Figure 2b. The initial direction of the polar coordinate system is Lo, which is also the initial direction of the reverse polar coordinate system.
- Standardization of initial direction. The initial direction of a polar coordinate system faces east, and the initial direction of several first-order terrain derivatives faces other directions, e.g., the initial direction of aspect faces north (Figure 1c). Thus, the initial direction must be standardized before calculating the vector operation of second-order terrain derivatives. For a first-order terrain derivative, its initial direction can be the same as that of the polar coordinate system, i.e., the initial direction of slope also faces east (Figure 2a). However, the angle can be 270° of the initial direction, which faces north in the polar coordinate system, i.e., aspect in Figure 2b. Thus, the initial direction of first-order terrain derivatives is defined as La, and the initial direction of the polar coordinate system is defined as Lo. The angle difference between the two initial directions should be a variable, which is defined as φ. Thus, for any direction of the first-order terrain derivative matrix, i.e., β, which is the angle between the initial direction (La) and the actual direction (Lb), the new direction (θ) of the first-order terrain derivatives in the polar coordinate system can be calculated using the following equation:
- Vector representation. These angles can be expressed as vectors in their respective polar coordinate systems based on the transformed directional property in the polar coordinate system.
2.3. Vectorization Expression of First-Order Terrain Derivatives
3. Case Study Areas and Data
4. Results
4.1. SoA and SoS of the Gaussian Surface
4.2. SoA and SoS of Different Landform Areas
4.3. Assessment of DEM Resolution Effects
5. Discussion
5.1. Correlation among Different Methods
5.2. Comparison of the Vector and Scalar Methods in Terrain Feature Extraction
5.3. Implications of the Vector Method for Other Terrain Derivative Calculation
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A
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Sample Areas | Elevation (m) | Average Height (m) | SD Height (m) | Average Slope (°) | Min–Max Slope (°) | SD Slope (°) | Area (km2) | Landform Type |
---|---|---|---|---|---|---|---|---|
TA1 | 814–1188 | 996.96 | 7.78 | 29.28 | 0–82.88 | 3.41 | 97.15 | Loess landform |
TA2 | 784–987 | 883.06 | 7.03 | 32.97 | 0–83.04 | 4.21 | 1.92 | Loess landform |
TA3 | 89–1470 | 710.33 | 17.92 | 31.58 | 0–86.94 | 3.52 | 180.43 | Structural landform |
TA4 | 166–1163 | 821.45 | 12.87 | 29.70 | 0–89.41 | 3.69 | 361.19 | Karst landform |
SoA Threshold | Lc | Le | Lr | Precision | Recall | F-Measure |
---|---|---|---|---|---|---|
15 | 182,000.77 | 326,021.61 | 182,971.37 | 55.82% | 99.47% | 71.51% |
20 | 178,168.25 | 247,039.42 | 182,971.37 | 72.12% | 97.37% | 82.87% |
25 | 173,473.66 | 205,916.77 | 182,971.37 | 84.24% | 94.81% | 89.22% |
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Hu, G.; Dai, W.; Li, S.; Xiong, L.; Tang, G. A Vector Operation to Extract Second-Order Terrain Derivatives from Digital Elevation Models. Remote Sens. 2020, 12, 3134. https://doi.org/10.3390/rs12193134
Hu G, Dai W, Li S, Xiong L, Tang G. A Vector Operation to Extract Second-Order Terrain Derivatives from Digital Elevation Models. Remote Sensing. 2020; 12(19):3134. https://doi.org/10.3390/rs12193134
Chicago/Turabian StyleHu, Guanghui, Wen Dai, Sijin Li, Liyang Xiong, and Guoan Tang. 2020. "A Vector Operation to Extract Second-Order Terrain Derivatives from Digital Elevation Models" Remote Sensing 12, no. 19: 3134. https://doi.org/10.3390/rs12193134
APA StyleHu, G., Dai, W., Li, S., Xiong, L., & Tang, G. (2020). A Vector Operation to Extract Second-Order Terrain Derivatives from Digital Elevation Models. Remote Sensing, 12(19), 3134. https://doi.org/10.3390/rs12193134