Optimal relief amplitude statistical unit acquisition method

Abstract

The invention provides an optimal relief amplitude statistical unit acquisition method. The method includes processing DEM (digital elevation model) data to extract relief amplitude values under different statistical units; selecting dependent variables and fitting models of relief amplitude; determining an optimal statistical unit range; performing relief amplitude classification and analysis within the statistical unit range and determining an optimal relief amplitude statistical unit. The optimal relief amplitude statistical unit acquisition method has the advantages that the method is quick and effective and achieves comparison validation with related national statistics data and other authoritative data, so that computation results are more accurate; the method can be used for determining optimal statistical units of other macrorelief factors; the method is capable of improving accuracy of assessment on development and evolution characteristics of orogenic belts and plateau mountain chains and geological disasters such as regional soil and water loss and landslip; the method provides reliable and accurate bases for geological disaster control and post-disaster measure selection.

Description

technical field [0001] The invention relates to the field of geomorphology and geological engineering, in particular to a method for obtaining an optimal statistical unit of terrain relief. Background technique [0002] Relief relief is an important index in geomorphology to describe landforms, reflecting the change of surface relief. Relief relief is the result of the interaction between geological structure and surface erosion process. It is often used in the study of the development and evolution characteristics of orogenic belts, plateau mountains, etc., and the evaluation of regional water and soil loss. It is also an objective basis for the comparative study of regional landforms and the classification of landform types. Studies have shown that there is a great correlation between topographic relief and the occurrence of landslide disasters. The key to the calculation of terrain relief lies in the selection of statistical units, that is, the value of a certain definit...

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Problems solved by technology

At present, there are many studies on the extraction of small-scale terrain relief using DEM, but there are few studies on the extraction of terrain relief in such a large scale as China. Most of the existing research is based on the analysis of sampling points or areas of terrain data. The determination method of the optimal statistical unit of terrain relief is relatively subjective, and the mean change point analysis method proposed later is weak in actual verification, and the accuracy needs to be verified

In addition, the currently commonly used four calculation models for determining the optimal statistical unit (artificial work map method, maximum height difference method, fuzzy mathematics method, and mean value change point analysis method) are proposed under two research ideas. The optimal statistical units are sometimes inconsistent, which has caused certain troubles to the in-depth research of geomorphology and disaster science

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