Abstract
Abstract. Remote sensing digital image mosaic refers to the splicing of two or more remote sensing images into a panoramic image to meet the application requirements of wide images. It is becoming more and more important to cover large areas of mosaic images. The data pre-processing and mosaic process are different for different images. In this paper, the declassified intelligence satellite photography (DISP) in the 1960s was used as experimental data, taking Qujing in Yunnan Province as an example, a total of 92 scene images were used for DISP image processing and seamless mosaic. Firstly, In order to make full use of the image, it is necessary to perform orthorectification on the KH-4B images covering Qujing. Considering that the satellite orbit parameters and other parameters are unknown, several models for orthorectification of satellite images are proposed. After experiments and analysis, it is concluded that the third order polynomial is the optimal. Secondly, given the problem of radiation imbalance caused by the difference of time phase, the histogram equalization method is used for color balance, the image of the seam line is eliminated. Finally, the seamless mosaic is achieved. The map of the 1960s DISP in Qujing is obtained. The map can provide material basis for future research and other fields. The processing methods of historical images can be used for reference by others.
Highlights
Historical remote sensing images have been of great research significance and application value in the fields of ecological environment change, sustainable development, agricultural development, urban expansion, coastline change, ice dynamic monitoring and so on(Mi et al.,2014)
The declassified intelligence satellite photography (DISP) image used in this article is from the United States Geological Survey (USGS) website, some of the free DISP images can be found and downloaded through Earth Explorer's interactive query system, while some need to be purchased
Orthorectification refers to the process of error elimination or correction of the acquired geometric distortion of the remote sensing image relative to the real surface target (Sun, 2003)
Summary
Historical remote sensing images have been of great research significance and application value in the fields of ecological environment change, sustainable development, agricultural development, urban expansion, coastline change, ice dynamic monitoring and so on(Mi et al.,2014). This paper uses the DISP image to carry out the seamless mosaic of the Qujing karst land in Yunnan, which has important historical significance. DATA 2.1 Study Area Qujing is located in the eastern part of Yunnan Province (see Figure 1), at the junction of Yunnan, Guizhou and Guangxi provinces It is located between 102°42′-104°50′ east longitude and 24°19′-27°03′ north latitude, with a total area of 32,565 km. The DISP image used in this article is from the USGS website (http://earthexplorer.usgs.gov/), some of the free DISP images can be found and downloaded through Earth Explorer's interactive query system, while some need to be purchased These historical images provided strong support for US military development and national security in the early days, as well as effective research assistance for environmentalists, scientists, scholars, and historians.
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