坡谱提取与应用的基本地域条件

Fundamental Conditions of Slope Spectrum Abstraction and Application

阐述坡谱提取原理,借鉴地理空间数据不确定性处理中的"ε-带"模型概念,构建坡谱稳定的判定模型,最后以陕北黄土高原和秦岭山区的典型地貌类型区为实验区,以1∶10 000 DEM为信息源,分析研究不同地貌类型区坡谱的变异特征,揭示坡谱提取与应用的基本条件:地貌形态的相似性与渐变性、研究尺度的合理性以及地貌类型的完整性。该研究为坡谱的进一步深入研究与应用奠定良好的理论基础,也为地理学研究中如何确定基本地域单元等重要的理论问题提供了借鉴思路。

Slope spectrum is an original methodology to analyze terrain character of the Loess Plateau. Both 1：10,000 DEMs of representative area in Loess Plateau and Qinling Mountains were taken as the test data, from which slope spectrums are derived. With the conception of ＂ε-band＂ from spatial data uncertainty, the variation character of different sampling area and position in different test areas were studied. The fundamental conditions of slope spectrum abstraction and application are geomophlogical similarity, rationality of study scale and the integrality of landform types. During the same time, the critical area in which the slope spectrum can exist stably is not only the foundation of derived correct slope spectrum, but also the reflection of the comparability of topographic feature between the local and globe. It makes great significance in many geography studies.