For more than 30 years, ESRI has been the world's leading provider of geographic information system (GIS) software. ESRI technology is used by more than 220,000 clients worldwide, including most federal agencies, national mapping agencies, 45 of the top 50 petroleum companies, most forestry companies, and many others in dozens of industries. ESRI software is the de facto standard for managing geographic information in local government and is used by more than 1,500 cities.
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