广东省高程异常坡度坡向分析

doi:10.3969/j.issn.0255-8297.2024.03.007

摘要/Abstract

摘要： 为了确定高程异常的空间变化情况，更好地指导全球导航卫星系统高程测量、数字高程基准维持等生产实践，提出利用数字高程模型（digital elevation model，DEM）理论研究似大地水准面的坡度、坡向等形态特征方法，建立高程异常与水平距离和方位之间的联系。对广东省DEM，以及不同精度、分辨率的似大地水准面提取坡度、坡向后进行了重分类和统计分析比较。结果表明，广东省似大地水准面坡度、坡向上都存在一个主要数值，不同于普通DEM特征；整体上以坡度0.0020°，沿坡向297°逐渐下降；该方向上高程异常值变化率约3.49 cm/km；似大地水准面的坡度、坡向与其分辨率和精度都密切相关；坡度值受分辨率的影响更大，受精度的影响较小；分辨率的粗略化会降低其坡度值。

关键词: 高程异常, 坡度, 坡向, 似大地水准面

Abstract: The study introduces the application of digital elevation model (DEM) theory to analyze the morphological characteristics of quasi-geoids, focusing on slope, aspect, and other features. By establishing the relationship between elevation anomaly, horizontal distance, and azimuth, it delineates spatial variations in elevation anomalies, offering guidance for height measurement using global navigation satellite system (GNSS), digital height datum maintenance and other production practices. Based on DEM theory, slope and aspect of quasi geoid with different precisions and resolutions were extracted, reclassified, and statistical analyzed in Guangdong Province. Results indicate that quasi-geoid in Guangdong Province exhibits distinctive slope and aspect patterns, deviating significantly from standard DEMs. Overall, the value gradually decreases by 0.0020°, along an aspect of 297°, and its rate of change is approximately 3.49 cm/km. The slope and aspect of quasi geoid are strongly associated with its resolution and accuracy. The slope is more affected by resolution than precision, leading to reduced values as resolution coarsens.

Key words: elevation anomaly, slope, aspect, quasi-geoid

中图分类号:

P223+.0

邓思胜. 广东省高程异常坡度坡向分析[J]. 应用科学学报, 2024, 42(3): 447-456.

DENG Sisheng. Analysis of Slope and Aspect with Elevation Anomaly in Guangdong Province[J]. Journal of Applied Sciences, 2024, 42(3): 447-456.

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