3

In a well known text definition file of a geolocated image (or whatever else it does) we find this:

PROJCS["UTM_Zone_19_Northern_Hemisphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS84",SPHEROID["WGS84",6378137,298.257223560493]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-69],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1]]

My question is, what is the number I marked bold (0.017453292519943295) function?

4

0.017453292519943295 is the conversion factor from radians to decimal degrees, exactly PI()/180.

Geodetic functions usually expect angles in radians, but our surveying ancestors decided to use degrees, minutes and seconds.

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