Method for recovering abnormal topographic data of lunar craters

Abstract

The invention discloses a method for recovering abnormal topographic data of lunar craters. The method comprises the following steps of: obtaining elevation value data; screening abnormal areas by adoption of a section elevation abnormal value detection algorithm; carrying out fitting to obtain an elevation distribution curve on the current section line by adoption of a section line curve fitting algorithm, and predicting elevation values of the abnormal areas on the section line according to the fit curve; and obtaining new recovery elevation value to complete the recovery of the original topographic data. According to the method disclosed by the invention, the data loopholes and data abnormal values in lunar topographic DEM data can be recovered, and the recovered topographic data is smooth in surface, so that the processing demands of Chang'e lunar basic spatial data are fully satisfied and the effect is apparent.

Description

technical field [0001] The invention relates to the field of lunar and planetary space information, in particular to a method for repairing abnormal terrain data of lunar craters. Background technique [0002] The lunar topographic data is the first topographic data of extraterrestrial objects obtained by our country through the lunar exploration project. The 7m-resolution full-month topographic data obtained by my country's Chang'e-2 probe is the most comprehensive coverage of the lunar surface obtained by humans so far. lunar terrain data. Lunar terrain data is mainly released in the form of DEM (Digital Elevation Model, Digital Elevation Model), which is valuable information for lunar scientific research. [0003] The topographic data of the full lunar scale are generally obtained through stereo photogrammetry and other technologies. Some problems such as local elevation anomalies and lack of data acquisition will exist in the lunar terrain data, which are specifically m...

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Problems solved by technology

However, these methods are not suitable for the restoration of lunar terrain data. First, under the existing conditions, there are few sources of lunar terrain remote sensing data. In addition to the lunar terrain data obtained by my country, there are currently only lunar terrain data from LOLA in the United States and Kaguya in Japan. These two kinds of data also have the problem of partial missing, therefore, it is difficult to repair by using other data; secondly, to supplement the lunar terrain data in the abnormal area by obtaining terrain data through actual measurement of the lunar surface, this method is technically difficult and expensive , which is not practical; in addition, some existing data interpolation algorithms for terrain restoration, such as multi-source DEM fusion algorithm, elevation data field linear interpolation method, etc., can eliminate terrain outliers and fill vacant areas, but there are some Limitation, the former is difficult to find other DEM data that is more matching, for example, if you need to repair the Chang'e data, you need to find Kaguya or LOLA data in the same area with similar resolution to match, but it is usually difficult to find a suitable data source; the latter, use Neighborhood linear interpolation method, for some large-scale vacant areas of ring pits, the repair effect is not good (such as Figure 2A and 2B shown)

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