GIS Date Input and Editing Question:
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What is Joining Data Files in GIS?


Once a GIS layer is created, its attribute file can be linked (joined) to external data files. Joining is one of the most frequently performed data file processes because it brings together feature attributes that are contained in multiple digital data files. To perform a join, a unique matching field, the key identifier, must be observed in both data files.

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What are the three main types of data error?What steps are involved in joining together two files are software specific?