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this is my method also. I utilize two different software to "prove" it. You might also peruse this question for some basic direction on projections. gis.stackexchange.com/questions/2769/…
– Brad Nesom
Commented Mar 28, 2011 at 20:16
7

You could simplify step 2 a little by just changing the dataframe (ArcMap) projection, and letting the known layer reproject on the fly.
– Brandon Copeland
Commented Mar 28, 2011 at 20:50
14

Note that you shouldn't be projecting the data. You should be defining the projection. Projecting the data changes the coordinates. Defining the projection just assigns a projection to that data and tells that software what projection the data is already in. These are two different tools in ArcMap, "Define Projection" is the one you want to use.
– Sean
Commented Aug 31, 2011 at 12:36
1

I prefer read the coordinate values, I can usually tell if they are decimal degrees, meters or feet (harder t distinguish) and then move to the best system. Start with WGS 84 if it appears decimal, UTM if meters, State plane if feet. I once had one that nobody could fix (for gravitational anomalies). It was USA state plane with a linear unit of......kilometers. I could tell from the fact it was close I had the system right but the state was tiny, ahh kilometers was the linear unit.
– If you do not know- just GIS
Commented Feb 24, 2019 at 2:44

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