I'm on a project requires integrating data for all states in the US. It means I have two roadway datasets and I'm going to assign the attributes of roadways in one dataset to the same roadways in the other dataset (similar to spatial join). Each state is an independent shapefile and I need to merge them all at the end to generate the final product.
I'm wondering which projected coordinate system should I use in this case? Or it doesn't matter at all since it won't affect the result of geoprocessing? For my past work, I only mapped small area so I chose state plane NAD 83 of specific area as projected system.
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