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What characters should be avoided when naming GIS files, folders, and map documents? Explain why these restrictions are necessary. 2 . What is a file

What characters should be avoided when naming GIS files, folders, and map documents?
Explain why these restrictions are necessary.
2. What is a file extension, and what does the computer use it for?
3. Although ArcGIS Online is a good source of many types of data, what factors may interfere
with using it to compile local data for a project?
4. List ways in which users of GIS and other large-scale software systems need to be more
careful about working with data.
5. Explain the difference between a feature class and a layer. How does this difference support
the ability of users to share the same data sets?
6. What does a red exclamation point next to a map layer mean? How does one fix it?
7. Extracting subsets of a data set is easy; combining different data sets into one feature class is
difficult. Explain why.
8. What is the difference between the Summary and Description fields in the Item Description?
9. Explain the difference between the terms feature, feature class, feature dataset, and
geodatabase. Which of them corresponds to a shapefile?
10. Explain what happens when a feature class is generalized or dissolved. What are some rea-
sons why it would be done?

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