Tie points (GCPs, CPs) import format - PIX4Dmatic

Tie points, including Ground Control Points (GCPs) and Checkpoints, can be imported using a .csv or .txt file. Each line contains either four or six columns, separated by commas (,). The supported tie point formats are detailed in the table below:

Note: The order of coordinates in the input file must match the order of axes in the coordinate system definition chosen in the import dialog.

For example, if the coordinate system definition specifies the first axis is X and the second is Y, the GCP input file must follow the same order.

For more information: How to check the order of the axes in the coordinate system definition section.

GCPs in geographic coordinates

label, coordinate1* [decimal degrees], coordinate2* [decimal degrees], z [meter]

GCP0,46.23456,6.56114,299.931
GCP1,46.23234,6.56234,299.823

The latitude value is between -90° and 90°.
The longitude value is between -180° and 180°.

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
GCP1,46.23234,6.56234,299.823,0.02,0.02

The latitude value is between -90° and 90°.
The longitude value is between -180° and 180°.

GCPs in projected coordinates

label, coordinate1* [units], coordinate2* [units], z [units]

GCP0,2532795.105,1152094.639,395.883
GCP1,2532728.805,1152079.825,396.619

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
GCP1,2532728.805,1152079.825,396.619,0.02,0.02

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.

Example: For the WGS 84 / UTM zone 32N (EPSG code 32632) the order of axes in the coordinate system definition is first Easting and second Northing. The GCPs file should be formatted as:

label, Easting [meter], Northing [meter], z [meter]

EPSG Geodetic Parameter Registry