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P. In the layers menu, I see a group called External Data. What does that mean?

In the layers menu, I see a group called External Data. What does that mean?

The layers in that group have been provided by outside agencies, such as the Federal Emergency Management Agency (FEMA). Please keep in mind that they may not be a perfect match to the data that we maintain, since they are created by other people who are meeting other agency’s requirements. We provide them as a general reference, but they should not be considered equivalent to a legal survey.