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  • 标题:A procedure for map updating using digital mono-plotting and DTMs
  • 本地全文:下载
  • 作者:Manuel Jauregui ; José Vilchez ; Leira Chacón
  • 期刊名称:ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
  • 印刷版ISSN:2194-9042
  • 电子版ISSN:2194-9050
  • 出版年度:1998
  • 卷号:XXXII Part 4
  • 出版社:Copernicus Publications
  • 摘要:The production and updating of maps of the terrain surface is a procedure that can be done easily by using aerialphotographs. In general this procedure needs to use expensive equipment that are not at reach of most offices requiringsuch maps. The advances in the computer science and the availability of low cost equipment for the digitizing and digitalprocessing of the aerial photographs, open a wide range of applications for the production of cartographic information ofthe terrain surface by digital means, being one of them the Digital Monoplotting. Digital monoplotting consists in theproduction of planimetric information of the terrain surface through the direct vectorization on a digital aerial photograph,by using an image display for the digitizing of all the significant features of the terrain, and afterwards performing aanalytical transformation on those vectors in order to correct the deformations intrinsic to the aerial photographs.In the case of non flat terrain, a rigorous transformation has to be performed to the digitized lines (vectors), by using thecolinearity equations based on control points of known coordinates and the Digital Terrain Model (DTM) of the terrain. Insuch a way, deformations due to relief displacement and photograph tilt are corrected, obtaining a map free ofdeformations, at a known scale and referenced to a terrain coordinate system. In order to know the planimetric positionof an image point on the terrain surface, it is necessary to determine the intersection point of the correspondingprojective ray with the DTM of the terrain. In general this is an iterative and time-consuming procedure. In this paper analternative direct solution to this problem is presented, and the requirements of the DTM density and accuracy applied todigital monoplotting are analyzed, with an application example
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