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MEDIUM RESOLUTION SATELLITE IMAGE PROCESSING TECHNOLOGY TO CREATE A SMOOTH COASTLINE ON MAPS

Lydmila Shagarova, Мalis Absametov, Mira Muratova

Abstract

The cartographic presentation of objects and phenomena of the real world requires their digital transformation. Space and geoinformation technologies are successfully used for the digital presentation of information about the state of spatial objects. This article describes the technology of digital processing medium resolution images, which ensures updating the vector contours of the coastline of water bodies in the territory being mapped using satellite data. The technology involves the following stages of image processing: unpacking of ?raw? space images, their geocoding and calibration, geometric and radiometric corrections, creating index images, the water surface detection, vectorization and smoothing of detected polygons. The vectorization of water body contours was done using the EXPOLRAS procedure, which allows converting the input raster image into a binary one with the help of the specified threshold values; to build polygons based on the created binary image; to filter them based on the area and compactness of values and to save the result into a vector layer. Smoothing of stepped lines obtained by converting a raster into a vector was done in two consecutive stages. To truncate rectangular corners of raster pixels the bit2poly procedure was applied; the further smoothing of vertices was done using the McMaster's averaging algorithm implemented in the SMMCMASTER procedure. The technology is shown on the example of water bodies of the Almaty region Thematic maps created using satellite images allowed to update vector contours of water bodies coastline in the territory being mapped. The refined contours of the surface water bodies have been used to update the cartographic base of the hydrogeological map of the Almaty region.

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DOI resolver: doi.org/10.5593/sgem2020v/1.3/s02.21

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