Digital Line Graphs from 1:100,000 - Scale Maps: Data Users Guide 2The Division, 1985 - 74 من الصفحات |
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30-minute area A.--Standard DLG Distribution actual number ALPHA APPENDIX A.--Standard DLG APPENDIX B.--Optional DLG APPENDIX D.--DLG Attribute area element area record ASCII attribute code B.--Optional DLG Distribution background area Byte Ending Byte Cartersville cartographic CODE APPLICATION CODE Contents Fortran Notation coordinate pairs coordinate system D.--DLG Attribute Codes--continued digital elevation model Digital Line Graphs Distribution Format Record DLG Data File DLG Distribution Format DLG file edge Element Contents Fortran encoded FILE IDENTIFICATION Filler Format Record Contents)--continued Format Starting GCTP geographic coordinates Header record inch INTEGER 2 16 INTEGER⭑2 Internal ID number line elements Line record line segment linkage records Logical Record Type major code Map projection minor code Multiple Element Types Number Data Element Number Element Contents Number of attributes optional distribution format projection parameters quadrangle Record Number Data Roads and Trails source material spaces Status flag Transportation TYPE OF CODE U.S. Geological Survey Universal Transverse Mercator x,y coordinate Туре
مقاطع مشهورة
الصفحة 3 - The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the US Geological Survey For additional information write to: District Chief US Geological Survey 333 W.
الصفحة 3 - Avail: NTIS HC A05/MF A01 CSCL 08B The National Cartographic Information Center (NCIC) distributes digital cartographic/geographic data files produced by the US Geological Survey (USGS) as part of the National Mapping Program. Digital cartographic data files may be grouped into four basic types. The first of these, called a digital line graph (DLG), is line map information in digital form. The second form, called a digital elevation model (DEM), consists of a sampled array of elevations for ground...
الصفحة 4 - ... cartographic quality. Level 2 This structure is designed to support graphic display or plotting equipment of high cartographic quality. The DLG files contain extensive attribute codes that describe the graphic elements. The DEM files are enhanced for consistency and filtered to reduce data volume. Level 3 The third structure is used for fully topologically structured data files designed to be integrated into geographic information systems. All topological relationships have been defined for the...
الصفحة 12 - Network, line graphs are used to represent linear features in digital form. The network case differs from the area case in that, irrespective of the number of closed areas forming the graph, only two area elements are encoded: (1) the area outside the graph, termed the outside area; and (2) the area within the graph, termed the background area. All lines except the graph boundary are considered to be contained within the background area. The major topological relationship expressed by network data...
الصفحة 25 - Rocky Mountain Mapping Center-NCIC US Geological Survey Box 25046, Stop 504 Federal Center Denver, CO 80225...
الصفحة 3 - The second, called a digital elevation model (DEM), consists of a sampled array of elevations for a number of ground positions that are usually, but not always, at regularly spaced intervals. The following are examples of user agencies...