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What’s a DEM? What’s a TIN? What’s the difference between a DEM, DTM and DSM? What are mass points and breaklines? How can I use DEMs to solve my problems? What datum should I use? How can I get DEMs, and what’s already available? What are the capabilities and limitations of these technologies for producing DEMs? What technology is best for me? How do I check the quality of a DEM? How do I know what to ask for? How do I specify my requirements to ensure that I get what I need? How much do DEMs cost? The DEM Users Manual answers these, and many other questions often asked by DEM users. This manual is designed to help potential users of digital elevation data understand and articulate their requirements in a way that their expectations are satisfied or exceeded. The book’s authors agreed that this manual should be written for the benefit of DEM users, not the producers of DEMs. The chapters were contributed by industry experts and cover a broad range of applications.