Placement of Compass Rose with Declination
I have a scanned graphic of a compass rose which I would like to place on a map. I would like to locate the graphic on the map based on the True North Declination. Can someone explain the best method for doing this?
Mapping Center Answer:
You can either make a picture marker symbol using your graphic (next to last section in the help topic) as the picture. Then just add a graphic marker to your data frame or layout in the location you want your compass rose to be shown. To set the angle, you'll need to know the estimated value of magnetic declination which varies by location and date/time. NOAA has a online calculator at: http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp. That will give you the angle (given your location) you need to use to rotate that graphic marker symbol.
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