TGIS_CSProjAbstract.ScaleFactor property

DK for Delphi | GisCsProjections.TGIS_CSProjAbstract.ScaleFactor | Constructors | Fields | Methods | Properties

Scale factor (uniform scale ratio) for this projection. Applies uniformly to both X and Y coordinates; valid for selected projections.

Available also on: .NET | Java | ActiveX | Python.

// Delphi
public
  property ScaleFactor : Double read write;

// C++ Builder
public:
  __property double ScaleFactor = {read, write};

PURPOSE:Adjust scale uniformly to reduce distortion along specific lines. UTM uses 0.9996 to reduce maximum distortion (about 1m per km error becomes 0.4m).

BEHAVIOR:Multiplies all projected coordinates by scale factor. Typical values: 1.0 (no scaling), 0.9996 (UTM), 0.999988 (State Plane). Values <l 1.0 "pull in" the projection surface.

USAGE:proj.ScaleFactor := 0.9996; (UTM standard)

CONSTRAINTS:Must be positive non-zero. Changing scale factor changes coordinate magnitudes and may break data consistency.