广东省高程异常坡度坡向分析

doi:10.3969/j.issn.0255-8297.2024.03.007

Abstract

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

CLC Number:

P223+.0

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

References

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Analysis of Slope and Aspect with Elevation Anomaly in Guangdong Province

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