FAQ: Convert Units for Use in Military Analyst Geodesy API

Answer

Military Analyst's Geodesy API accepts units in meters. All other units must be converted to meters before use. The conversion is done using the IUnitConverter interface in the esriSystem library. For example, to convert 10 meters to nautical miles:

Code:
Dim k As IUnitConverter
Set k = New UnitConverter
Dim j As Double

j = k.ConvertUnits(10, esriMeters, esriNauticalMiles)

Other units for conversion are:

Code:
esriUnknownUnits	0	Unknown	   
esriInches		1	Inches	   
esriPoints		2	Points	   
esriFeet		3	Feet	   
esriYards		4	Yards	   
esriMiles		5	Miles	   
esriNauticalMiles	6	Nautical miles	   
esriMillimeters	        7       Millimeters	   
esriCentimeters	        8	Centimeters	   
esriMeters		9	Meters	   
esriKilometers		10	Kilometers	   
esriDecimalDegrees	11	Decimal degrees	   
esriDecimeters		12	Decimeters	   
esriUnitsLast		13	Internal use only

To convert from US Survey feet, instead of the default International Feet, multiply by 1200/3937 to obtain meters. Input the results into the function above.

Article ID:000008994

Software:

ArcMap 9 x
ArcGIS Engine 9 x

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Convert units for use in Military Analyst Geodesy API

Answer

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