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Calculating the distance between point locations is often an important component of many forms of spatial analysis in business and research. Although specialized software is available to perform this function, the power and
flexibility of Base SAS® makes it easy to compute a variety of distance measures. An added advantage is that
these measures can be customized according to specific user requirements and seamlessly incorporated with
other SAS code. This paper outlines the basic concepts and methods involved in calculating geographic distance.
Topics include distance calculations in two dimensions, considerations when dealing with latitude and longitude,
measuring spherical distance, and map projections. In addition, several queries and calculations based on distances are also demonstrated.

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