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Hard to transfer tabular data . <br /> CADD <br /> DXF Medium Yes Usually obtained from <br /> ,. Products engineering firms and surveyors. <br /> Native AutoCAD format. <br /> DWG AutoCAD Medium Yes Arclnfo and ArcView can read <br /> these files without conversion. <br /> Must be converted to a <br /> I Intergraph Low Yes different format for use with <br /> Arclnfo or ArcView <br /> Digital Line Graph data used by <br /> DLG USGS Low Yes the USGS. Often DLG files have <br /> been converted already into a <br /> ' more usable format. <br /> Spatial Data Transfer Standard . <br /> Developed by the National <br /> SDTS USGS Low Yes I Mapping Division of the USGS. <br /> Primarily used as a cross- <br /> platform distribution format. <br /> Point and Raster formats <br /> Contains valuable <br /> demographic data . Should be <br /> Census acquired . But the native tiger <br /> Tiger Files Bureau Low Yes file format is cumbersome and <br /> difficult to translate . Try to find <br /> a state agency that has done <br /> the conversion already. <br /> Used for the generation of <br /> elevation contours. <br /> DEM Digital Various Cumbersome to use but often <br /> Elevation Sources Low very Little necessary. Requires ArcGIS <br /> Model Spatial Analyst to utilize raster <br /> data. <br /> MrSID and GeoTIFF are formai <br /> F, Sun Raster, of choice. Various image <br /> TIFF, <br /> BMP, BIL, Various formats that can be displayed <br /> JFIGIF, JPEG, Sources Low No directly in ArcGIS and <br /> MrSID AutoCAD . Useful for display, <br /> aerial imagery and <br /> photographs. <br /> Whenever possible, data should be obtained in ArcGIS geodatabase , ArcView Shapefile , or <br /> AutoCAD (with object data ) format . These formats are the easiest to use . GIS datasets are <br /> usually large and will require data transfer by tape , compact disc , or via the Internet . Data <br /> can be supplied on CD as an ArcView Shapefile or ArcGIS personal geodatabase . It should <br /> be noted that surveyors and engineers usually utilize a computer aided drafting or CAD <br /> product . The optimal means of transferring data from or to a CAD system is to utilize the <br /> Digital Exchange Format or DXF . <br /> &O' Coordinate Systems and Datums <br /> Coordinate Systems <br /> GIS layer spatial information is stored in a coordinate system , defined by the projection of the <br /> map . The coordinate system of the digital map is important . If digital data are obtained <br /> 6-3 <br /> GIS Needs Assessment and Implementation Plan Chapter 6 - Data Standards and Transfer <br />