Orthority GCPs

The native Orthority GCP format is a standard GeoJSON FeatureCollection of Point features, that can be visualised in a GIS. Each Feature is a GCP, where the geometry is its position in 3D WGS84 geographic coordinates. Feature properties are as follows:

Property	Value
filename	Image file name excluding parent path, with or without extension.
ji	Image [j, i] position in pixel coordinates.
id	ID string (optional).
info	Information string (optional).

An example file defining a single GCP:

{
    "type": "FeatureCollection",
    "features": [
        {
            "type": "Feature",
            "properties": {
                "filename": "qb2_basic1b.tif",
                "ji": [
                    821.3001696660183,
                    62.303697728645055
                ],
                "id": "concrete-plinth-70",
                "info": "concrete-plinth-70"
            },
            "geometry": {
                "type": "Point",
                "coordinates": [
                    24.41948061951812,
                    -33.65426900104435,
                    214.75143153141929
                ]
            }
        }
    ]
}