oty rpc

oty rpc orthorectifies with RPC camera model(s) derived from image tags / sidecar files or an Orthority RPC parameter file. This example orthorectifies a satellite image with RPC tags using the NGI DEM of the same area. Ortho images are placed in the current directory:

oty rpc --dem ngi/dem.tif rpc/qb2_basic1b.tif

The model can also be defined by an RPC parameter file:

oty rpc --dem ngi/dem.tif --rpc-param rpc/rpc_param.yaml rpc/qb2_basic1b.tif

By default, a 3D WGS84 geographic CRS is used as the world / ortho CRS. This can be changed with --crs. The RPC world / ortho CRS is required to use ellipsoidal heights (m). If DEM heights are not ellipsoidal, both world / ortho and DEM CRSs should define a vertical CRS. In this example, the NGI DEM has a defined EGM2008 vertical CRS, so the world / ortho CRS is defined as a 2D+1D CRS with ellipsoidal heights:

oty rpc --dem ngi/dem.tif --crs EPSG:32735+4326 rpc/qb2_basic1b.tif

The RPC model can be refined with GCPs using --gcp-refine. GCPs can be provided in SOURCE image tags:

oty rpc --dem ngi/dem.tif --gcp-refine tags rpc/qb2_basic1b.tif

Or GCPs can be provided with an Orthority GCPs file. The --refine-method option specifies the refinement method:

oty rpc --dem ngi/dem.tif --gcp-refine rpc/gcps.geojson --refine-method shift rpc/qb2_basic1b.tif