The data type of lat and long are "Single" - Please try to use
lat=47.6062095f instead
More on data type and querying syntax:
http://msdn.microsoft.com/en-us/library/cc907912.aspx
Note the section on "Edm.float":
‘[0-9]+.[0-9]+f’
Regards,
PQ
Peter Q. http://blogs.msdn.com/peter_qian