What is the scale that the APEFZ maps were originally digitized from?
Original hardcopy EFZ maps were compiled over the past 25 years at a scale of 1:24,000. GIS data files were created by scanning the hardcopy maps used to generate Official EFZ maps. The scanned images were then digitized on screen. The result is GIS files showing point, line, and polygon features representing annotations and registration points, fault traces, and EFZ boundaries. Although it is possible to show the GIS features at any scale, users of these digital files must recognize the difference between precision and accuracy. The digital data can be reproduced precisely at any scale, but the accuracy of the data remains constant. As the scale is increased from 1:24,000, uncertainty and errors in fault location and EFZ boundary and turning point locations remain the same.
