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Why do the values I get with FME AreaCalculator and LengthCalculator differ from the values displayed in MapInfo?Can I get the same values as calculated by MapInfo Area() and ObjectLen() functions using FME?
Comparing area/length calculated with MapInfo to area/length calculated with FME is quite often confusing.你得到一些不同的数字。This is why: MapInfo uses eitherCartesianorSphericalmethod to calculate areas/distances (Sphericalis used by default when possible),while FME always usesCartesianmethod.
This is how both methods are described in MapInfo Help:
To switch from Spherical calculation to Cartesian in MapInfo map window,please,select Map > Options..and change the setting in Distance/Area Using GroupBox.
If you use a MapInfo function to calculate an object area in MapInfo,you have three options: you can use either Area(),or SphericalArea(),or CartesianArea() function.
NB: Area() will use the method set in Map > Options...> Distance/Area Using.
The same applies to object length calculation using MapInfo functions.The three options in this case are:ObjectLen(),SphericalObjectLen(),andCartesianObjectLen().
If you open your data in MapInfo,set Cartesian for distance/area calculation in map options,and check Cartesian area or length of an object,you will get exactly the same value as calculated by FME.
Calculating Area,Perimeter,and Lengths
Distance Measurements with the LengthCalculator
Coordinate Systems and Measurements with the Reprojector
FME and the Gtrans coordinate system transformation tools
Reading ESRI WKT Coordinate Systems Can Result in Prefixed/Suffixed Coordinate System Names
Swedish Direct Reprojection using SWEREF99 and RT90 datums
How to convert MapInfo to Shapefile (MIF/MID to SHP)
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