Terrain feature line processing method for improving terrain expression precision

Abstract

The invention discloses a terrain feature line processing method for improving the terrain expression precision. The method comprises the following steps: S1, screening topographic feature lines needing to be specially processed according to the elevation difference of two sides; S2, generating a parallel characteristic line of the characteristic line to be processed on one side with a low elevation value; S3, inserting nodes on the original characteristic line and the parallel characteristic line of the original characteristic line according to a specified step length; S4, estimating the elevation value of the node inserted by the original characteristic line in step S3 according to the known elevation points around the node; S5, estimating the elevation value of the node inserted by theparallel characteristic line generated in step S3 according to the known elevation points around the node; and S6, outputting the curve of which the elevation value is calculated, and constructing a TIN with other topographic data. According to the method, two key technical links of topographic feature line parallel feature line generation and feature line node elevation value estimation are adopted, so the problem of morphological distortion caused by topographic steep ridge lines in topographic modeling can be effectively solved.

Description

Technical field[0001]The invention belongs to the technical field of high-precision digital elevation model construction, and relates to a series of preprocessing operations on topographic feature line data, so that topographic feature line information can be effectively integrated into the construction of the surface model, thereby improving the terrain expression of the constructed surface model Accuracy.Background technique[0002]The Digital Elevation Model (DEM) is the core content of the national basic geographic data. At present, my country has initially completed the construction of 1:1 million, 1:250,000, 1:50,000 and 1:10,000 DEM data in some regions. These data play an indispensable role in the national economy, national defense construction, and scientific research. Its application fields cover many fields such as surveying and mapping, transportation, military, water conservancy, agriculture, environment, resource management, planning and tourism.[0003]The existing classi...

AI Technical Summary

Problems solved by technology

The result of using the elevation points on both sides of the steep slope line to estimate is that the elevation value of the node on the steep slope line is lower than its normal value, and finally the constructed TIN will form a series of irregular slopes at the steep slope line, steep mutant topography cannot be efficiently expressed

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