Smart Data Compression
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Smart Data Compression is a compressed GIS dataset format developed by ESRI. It stores all types of feature data and attribute information together as a core data structure. The SDC format is used in ESRI products such as ArcGIS StreetMap, ArcIMS Route Server, RouteMAP IMS, ArcGIS Business Analyst, and the ArcMobile SDK.
Compression ratios range from 8x to 20x depending on the data source and structure. SDC data is optimized for rapid map display, accurate routing, and high-performance geocoding.
Both Tele Atlas and NAVTEQ provide North American commercial street datasets in SDC format.
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