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differenct values between Map Coordinate Converter and envi_convert_projection_coordinates [message #75486]

Fri, 11 March 2011 13:31

caf.pang
Messages: 4
Registered: June 2007

Junior Member

Dear Folks,

There is tens of meters difference between Map Coordinate Converter
and envi_convert_projection_coordinates when I try to conver from
State Plane system to UTM system. Would you please help me out?
Setting in Map Coordinate Converter:
First Coordinate:
Proj : State Plane (North Carolina)
Datum: North America 1983
Second Coordinate:
Proj : UTM, Zone 16 North
Datum: WGS-84

Code for envi_convert_projection_coordinates
iproj = ENVI_PROJ_CREATE(/State_Plane,datum='NAD83', zone=3200)
oproj = ENVI_PROJ_CREATE(/utm,datum='WGS 84',zone=16)
ixmap = [568543.280000]
iymap = [620005.240000]

envi_convert_projection_coordinates, ixmap, iymap, iproj, oxmap,
oymap, oproj
Test value: x 568543.2800, y 620005.2400
Map Coordinate Converter out value: x 790506.3042, y 3917483.1830
envi_convert_projection_coordinates out: x 790522.86, y 3917290.2

Thanks,
Yong

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