Abstract
Abstract. In the global mapping work, there will be no control points or uneven distribution of control points. The traditional method of single scene image correction based on ground control points is not suitable for modern surveying and mapping, which has no available control points in a large range. New control data is urgently needed to make up for the influence of traditional control points on surveying and mapping. In this paper, aiming at improving the elevation accuracy of ZY-3 uncontrolled point surveying, a filtering principle based on the analysis based on waveform analysis and the stereo image pair based on tie points is proposed for the screening of GLAS laser elevation points. A new method using high-reliability laser elevation control points as the height constraint and the regional network adjustment of ZY-3 images without control points is studied. Through the experiment in Shandong Province, it is proved that the elevation accuracy of the adjustment can be improved obviously by introducing the selected laser points. The mean error of adjustment elevation is increased from −2.297 to 0.216m and the mean square error of elevation is increased from 3.193m to 2.007m, significantly improving the elevation positioning accuracy of adjustment.
Highlights
With the continuous development of science and technology, people can use optical satellites to quickly obtain massive image data covering the earth's surface in a short time
This paper proposes a laser data screening mechanism based on the precise screening of waveform data and the re-screening of stereoscopic image pairs of tie points, and geoscience laser altimeter system (GLAS) laser altimetry data with high reliability is screened out
We have proposed a laser data filtering mechanism, which is composed of algorithms such as fine screening based on echo data and rescreening based on stereo image pairs of tie points
Summary
With the continuous development of science and technology, people can use optical satellites to quickly obtain massive image data covering the earth's surface in a short time. Using these data for regional network adjustment, we can obtain high-precision DOM and DSM of the earth's surface, and provide other industries with high-precision spatial reference data. In the actual mapping engineering, a certain number of ground control points should be evenly arranged in the survey area to ensure the geometric accuracy of the adjustment results (Zhang et al, 2009). The adjustment method without ground control of the stereo satellite image has been concerned and studied by many scholars
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