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This is a point in Brewster, MA, USA. How would it be converted to WKID 4326?

324299.3348436486, 832511.5939650714

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WGS84 is a datum, not a coordinate system. Your question needs clarification since it doesn't inherently make sense. What is the source of these coordinates? They appear to be easting and northings (presumably in meters), but they don't represent any known location. –  Nick Ochoski Aug 5 '11 at 18:16
    
Is there no projection assigned to the data? Your question needs more clarity / detail (as Radar stated). You should just be able to right mouse on it and check this under the coordinate system tab (assuming your using ArcMap, which you've not stated either). If not, look in the metadata for info, and if that doesn't work, try Googling the name of the shapefile (including the extension [.shp]). –  Dano Aug 5 '11 at 18:22
    
See this thread for more information: gis.stackexchange.com/questions/664/… –  Nick Ochoski Aug 5 '11 at 18:23
    
Thank you for your comment. Is the question clarified if I edit it to request a conversion to WKID 4326? –  Terrapin Aug 5 '11 at 18:23
    
Where did you get the point coordinates from? –  Sasa Ivetic Aug 5 '11 at 18:37
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2 Answers 2

up vote 5 down vote accepted

I think you're looking for EPSG:26986. Source: http://www.mass.gov/mgis/dd-over.htm

Projecting your point from 26986 -> 4326 you end up in Brewster, MA: 26986->4326 using spatialreference.org

Results in -70.005868000000007, 41.733080999999999 -> Google Maps

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Thanks. I can confirm that this is correct based on the address that I have for this point. –  Terrapin Aug 5 '11 at 19:02
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The coordinates appear to be in NAD 1983 State Plane Massachusetts (Mainland), in meters. I decided this by first adding state and county boundary data to ArcMap. They are in NAD 1983. I then checked on the location of Brewster (southeastern coast of Cape Code Bay). I then set ArcMap's data frame's coordinate system to NAD 1983 State Plane MA mainland zone and looked to see where the coordinates in the question are. They showed up in the Brewster area.

Why did I choose this one first? Coordinates weren't UTM, so probably State Plane. More likely to be NAD83 than NAD27. The values didn't seem big enough to be feet, so tried the meters one.

To answer your question on converting to WGS84 (EPSG:4326), it will depend on what software you have available.

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+1 This answer is valuable for the insight it provides about how to think about common projections and how to reason about problems like this, which are common. –  whuber Aug 5 '11 at 20:35
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