Abstract
The development of Earth observation systems has changed the nature of survey and mapping products, as well as the methods for updating maps. Among optical satellite mapping methods, the multiline array stereo and agile stereo modes are the most common methods for acquiring stereo images. However, differences in temporal resolution and spatial coverage limit their application. In terms of this issue, our study takes advantage of the wide spatial coverage and high revisit frequencies of wide swath images and aims at verifying the feasibility of stereo mapping with the wide swath stereo mode and reaching a reliable stereo accuracy level using calibration. In contrast with classic stereo modes, the wide swath stereo mode is characterized by both a wide spatial coverage and high-temporal resolution and is capable of obtaining a wide range of stereo images over a short period. In this study, Gaofen-1 (GF-1) wide-field-view (WFV) images, with total imaging widths of 800 km, multispectral resolutions of 16 m and revisit periods of four days, are used for wide swath stereo mapping. To acquire a high-accuracy digital surface model (DSM), the nonlinear system distortion in the GF-1 WFV images is detected and compensated for in advance. The elevation accuracy of the wide swath stereo mode of the GF-1 WFV images can be improved from 103 m to 30 m for a DSM with proper calibration, meeting the demands for 1:250,000 scale mapping and rapid topographic map updates and showing improved efficacy for satellite imaging.
Highlights
By the end of the twentieth century, a series of major breakthroughs had been made in the fields of space technology and information technology, resulting in significant changes to the fields of surveying and mapping
We show how the wide field and short revisit period of images in the wide swath stereo mode can address this issue
This paper proposes a wide swath stereo mode method that is characterized by both a wide spatial coverage and a high-temporal resolution
Summary
By the end of the twentieth century, a series of major breakthroughs had been made in the fields of space technology and information technology, resulting in significant changes to the fields of surveying and mapping. The multiline array stereo mode uses multiline array cameras to image the surface and acquire multiple images at different angles, baselines, and overlapping areas Because this method acquires strip images along a track, it is capable of surveying and mapping a wide area. The wide swath stereo mode uses one camera to observe the same area from different orbits and forms a stereo image stereo mode uses one camera to observe the same area from different orbits and forms a stereo image pair using the WFV of the camera without requiring attitude agility. Calibration of the lens to correct for the radial distortions is used in generation of digital surface models (DSMs) from SPOT-5 [22], and there are used to implement the wide swath stereo mode.
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