Terrain Factor Abstracted Automatically Based On Relief Map

Based on the arrangement and editor for the Dazhang Village relief map, applying GeoMap Control Unit , using Application Programming Interface(API), the thesis develop the GeoMap control unit father .Through GeoMap Control Unit and its automation object, using the peculiarity of vector graph and attribute data and graph data and incorporating of them, terrain factor is abstracted in the thesis. Terrain factor from attribute data having attribute message including name of detail, layer of detail, OID of detail, etc . Terrain factor from graph data having graph message including extent of detail, area of detail, etc . Terrain factor from attribute data and graph data including cross-section profile, visibility analysis, contour, slope, aspect, etc . contour, slope and aspect are based on cubic trend surface, then calculate contour of block rectangle grid interlace, any contour of point can be calculated using the contour of block rectangle grid interlace through distance interpolation . The feature of this devise as follows , first overcome accuracy limit through artificial identification and the coefficient of correlation of all sorts of data is small such as slope and aspect, make them integrated father , secondly the terrain factor by incorporating of attribute data and graph data overcome simple of the terrain factor using attribute data and graph data respectively and fulfil demand of works design on the based of relief map can help works design on some degree .