GEOREF Golden Software Georeference [.georef] File Description
The Golden Software Georeference GEOREF file stores control point information for an image. The GEOREF file is a text file that defines the warp method and control point source and target coordinates.
Format
The GEOREF file includes a header that defines the file version, warp method, coordinate system, and data columns:
Surfer Georeference Control Point File
Version=1
Method=<warpMethod>
Name,Raster X,Raster Y,Longitude,Latitude,Active
<data>
Surfer Georeference Control Point File
Version=2
Method=<warpMethod>
TargetCoordinateSystem=<baseCoordinateSystem>
<coordinateSystemInfo>
Name,Raster X,Raster Y,Longitude,Latitude,Active
<data>
The Version indicates the file version. The GEOREF version 2 file added coordinate system information. The WarpMethod value indicates the warp method, described in the table below. The TargetCoordinateSystem defines the coordinate system for the points. Following the header, each line in the GEOREF file contains a control point with comma-separated values for the control point Name, Raster X, Raster Y, Longitude, Latitude, and Active state.
|
Warp Method |
Value |
|
Affine Polynomial |
3 |
|
First Order Polynomial |
4 |
|
Second Order Polynomial |
5 |
|
Third Order Polynomial |
6 |
|
Thin Plate Spline |
8 |
|
Natural Cubic Spline |
9 |
|
Marcov Spline |
10 |
|
Exponential Spline |
11 |
|
Rational Quadratic Spline |
12 |
|
Inverse Distance Squared |
13 |