The file format to import tie points (Ground Control Point, Checkpoints) is a .csv or .txt file. It contains four or six columns per line and uses commas "," as column separators. The formats of tie points are described in the table below:
- GCPs in geographic coordinates.
- GCPs in geographic coordinates with accuracy values.
- GCPs in projected coordinates.
- GCPs in projected coordinates with accuracy values.
| GCPs in geographic coordinates |
|---|
|
label, coordinate1* [decimal degrees], coordinate2* [decimal degrees], z [meter] GCP0,46.23456,6.56114,299.931 The latitude value is between -90° and 90°. |
| GCPs in geographic coordinates with accuracy values |
|
label, coordinate1* [decimal degrees], coordinate2* [decimal degrees], z [meter], Accuracy Horz [meter], Accuracy Vert [meter] GCP0,46.23456,6.56114,299.931,0.02,0.02 The latitude value is between -90° and 90°. |
| GCPs in projected coordinates |
|
label, coordinate1* [units], coordinate2* [units], z [units] GCP0,2532795.105,1152094.639,395.883 |
| GCPs in projected coordinates with accuracy values |
|
label, coordinate1* [units], coordinate2* [units], z [units], Accuracy Horz [units], Accuracy Vert [units] GCP0,2532795.105,1152094.639,395.883,0.02,0.02 |
How to check the order of the axes in the coordinate system definition
To check the order of axes in the coordinate system definition:
- Open the EPSG Geodetic Parameter Registry website.
- Write the name or the EPSG code in the EPSG Dataset - Text search.
- Click GO and select the correct name in the results..
- Expand the COORDINATE SYSTEM section and check the order in the AXES subsection.
After checking the order of the axes in the coordinate system definition, modify the input file to follow the same order of coordinates.
label, Easting [meter], Northing [meter], z [meter]
Check the order of AXES on the EPSG website.
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