Orthority exterior parameters¶

This is the native Orthority format for frame camera exterior parameters. It is a standard GeoJSON FeatureCollection of Point features, that can be visualised in a GIS. The world / ortho CRS is stored in a world_crs member of the FeatureCollection as a WKT, proj4 or EPSG string. E.g.

{
    "type": "FeatureCollection",
    "world_crs": "EPSG:32651",
    "features": [
        "..."
    ]
}

Each Feature corresponds to a source image file, where the Feature geometry is the camera position in geographic coordinates. The Feature properties are as follows:

Property	Value
`filename`	Image file name excluding parent path, with or without extension.
`camera`	ID of camera interior parameters (can be `null`).
`xyz`	Camera `[x, y, z]` position in world / ortho coordinates.
`opk`	Camera `[omega, phi, kappa]` orientation angles in radians.

An example file with exterior parameters for a single image:

{
    "type": "FeatureCollection",
    "world_crs": "EPSG:32634",
    "features": [
        {
            "type": "Feature",
            "properties": {
                "filename": "src_image_0.jpg",
                "camera": "Pinhole camera ID",
                "xyz": [20000.0, 30000.0, 1000.0],
                "opk": [-0.05, 0.03, 0.17]
            },
            "geometry": {
                "type": "Point",
                "coordinates": [16.690410, 0.270646, 1000.0]
            }
        }
    ]
}