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The paper describes the developed new module for the "ICE" software package for calculating the edges of the ice cover at an arbitrary date. The geographic location of the edges and the middle edge of the ice between the two previously constructed edges is calculated on the basis of ice map-charts, compiled from satellite data. The algorithm is implemented in the module allows identifying the edge as a set of consecutive points identified on the boundary between the ice cover field and clean water. For each point of the calculating edge, both geographical and Cartesian coordinates are defined. The algorithm for calculating the geographic location of the edges of ice includes the sequential search of all horizontal and vertical adjacent pairs of pixels of the map-chart and determining the presence of a color transition by their color characteristics with the calculation of the coordinates of the boundary point between two color difference pixels. Detection of the first point of the edge sector allows us to proceed to a cyclical search for adjacent points that are suitable for the edge condition and to compile a complete list of points of this sector. Similarly, all other sectors are searched all over the water area on the map. The calculation of the geographic location of the middle edge is performed by the method of sequential search for each point of one edge the corresponding nearest point of the other edge and the following calculation the midpoint for the found pairs. Its coordinates are defined as the arithmetic mean between the longitudes and latitudes of the pair of nearest edge points. The middle edge can also be calculated recursively based on other previously constructed middle edges. The software module allows to analyze maps for the existence of edges, to correct individual sectors of the edges before the calculation stage and to obtain the resulting text files with ordered sets of geographic coordinates of the ice edge points. The output data is compatible with GIS, which allows further processing and visualization.

DEVELOPMENT OF THE PROGRAM MODULE FOR CALCULATION OF ICE EDGES BY THE EARTH REMOTE SENSING DATA