Automatic raster-vector conversion of topographic maps
نویسندگان
چکیده
منابع مشابه
Generating Named Road Vector Data from Raster Maps
Raster maps contain rich road information, such as the topology and names of roads, but this information is “locked” in images and inaccessible in a geographic information system (GIS). Previous approaches for road extraction from raster maps typically handle this problem as raster-to-vector conversion and hence the extracted road vector data are line segments without the knowledge of road name...
متن کاملAutomatic Digitizing of the Colour-Layer of Thematic Maps
A method for automatic classification and dcscription of the colour-layer of thcrnatic maps is presented. Owing to the type of noisc appcaring in the scanncd imagcs, we find it useful to combine pixel classificatiorl and rastcr-to-vector convcrsion in ordcr to produce acceptable results. l'hc colour value of an arca is dctcrmincd from a sclcctivcly sampled set of pixcls and a set of threshold v...
متن کاملCombining Sources of Evidence to Resolve Ambiguities in Toponym Recognition in Cartographic Maps
Graphical documents such as cartographic maps contain a great variety of textual elements appearing in different spatial positions, in different fonts, sizes, and colors, touching and overlapping graphical symbols. This greatly complicates automatic optical recognition of such textual elements in the process of raster-to-vector conversion of graphical documents. In this work, we propose a metho...
متن کاملA Knowledge-Based Approach to Raster-Vector Conversion of Large Scale Topographic Maps
Paper-based raster maps are primarily for human consumption, and their interpretation always requires some level of human expertese. Todays computer services in geoinformatics usually require vectorized topographic maps. The usual method of the conversion has been an error-prone, manual process. In this article, the possibilities, methods and difficulties of the conversion are discussed. The re...
متن کاملError Detection and Correction in Toponym Recognition in Cartographic Maps
At present a lot of methods and programs for automatic text recognition exist. However there are no effective text recognition systems for graphic documents. Graphic documents usually contain a great variety of textual information. As a rule the text appears in arbitrary spatial positions, in different fonts, sizes and colors. The text can touch and overlap graphic symbols. The text meaning is ...
متن کامل