GIS Date Input and Editing Question:
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Practical problems faced when scanning map documents include:


1. Selection of appropriate tolerances
2. Lack of suitable raster to vector conversion software
3. Possibility of optical distortion
4. Inclusion of unwanted information

Inclusion of unwanted information
Selection of appropriate tolerances
Possibility of optical distortion

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What are the common problems faced when obtaining data from secondary sources?Which of the following can be a problem in manual digitizing?