GEO 481 Lecture Notes - Lecture 5: Data Quality, Visual Acuity, Digitizing
4 Mar 2019
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Document Summary
Using modern technologies, it is expensive, and things may have changed. Ex: having remote sensing images (raster), but we want high quality (vector) Digitizing: process of transferring geographic information from non-digital media to digital formats. The highest accuracy of the digitized data depends on the map scale. The quality of data digitized from a paper map is limited by the map scale. The accuracy of the data cannot be guaranteed when you zoom into a map scale larger than the original scale of the paper map. Captures spatial data by tracing lines from a paper map by hand. Generates a string of points with (x,y) values (vector data) The quality of data is largely influenced by the operators. Different operators may have different visual acuity, hand steadiness, attention to details. Even the best operators may not be able to maintain focus for a long time, due to a fatigue and the repetitive task.
