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Problems measuring distance, calculating acreage, and incorrect scale

Question asked by btwygal on Aug 12, 2017
Latest reply on Aug 12, 2017 by curtvprice

Inserting the scale bar with USGS topographic basemap clearly shows the map scale is more than twice what is expected. Measure a section (square mile) with the measure tool yields nearly 3000 acres when it should only by 640. Similarly measuring the square miles of a single section should be only 1 square mile but measure tool gives 4. An inserted scale bar is also off by a similar factor. Any suggestions on why ArcMap 10.2.2 is miscalculating?