Helmert or affine coordinate transformation file

Coordinate transformation uses *.HEL extension file, which includes following parameters:

A,B,dZ Helmert A and B parameters and Z move

X1,Y1,Z1 old coordinate system weight center

X2,Y2,Z2 new coordinate system weight center

If only move parameters dX and dY are known, set old coordinate system weight center to zero:

A,B,dZ Helmert A and B parameters and Z move

0.0,0.0,0.0 zeroes

dX,dY,0.0 move parameters

Example:

0.269987562061,0.350705337263,-6.476000000000
6697179.345000000512,3444319.490000000000,13.026000000000
6697156.222000000000,3444325.912000000000,6.550000000000

Affine transformation

Affine (*.AFF) file has same format as HEL-file, but the first file gets the extra parameters needed for affine transformation.

E.g. Helmert

A, B, dZ

And affine

A1, A2, B1, B2, dZ

You can use affine transformation the same way as Helmert by giving the AFF-file instead of HEL-file in format conversion or coordinate transformation. Affine file must have extension AFF.