Ellipsoid Correction

Ellipsoid Correction RD Operator

The operator implements the Range Doppler orthorectification method [1]. The implementation is exactly the same as for the Range Doppler Terrain Correction operator except that the averaged scene height is used instead of DEM.

Resampling Method Supported

• nearest_neighbour
• bilinear_interpolation
• cubic_convolution

Map Projection Supported

Right now the following projections are supported by NEXT: 

• Geographic Lat/Lon
• Lambert Conformal Conic
• Stereographic
• Transverse Mercator
• UTM
• Universal Polar Stereographic North
• Universal Polar Stereographic South

Parameters Used

The following parameters are used by the operator:

1. Source Band: All bands (real or virtual) of the source product. User can select one or more bands. For complex product, i and q bands must be selected together. If no bands are selected, then by default all bands are selected.
2. Image resampling method: Interpolation methods for obtaining pixel values from source image. There are three interpolation methods available: nearest neighbour, bi-linear and cubic interpolations.
3. Map Projection: The map projection types. The orthorectified image will be presented with the user selected map projection.

[1]  Small D., Schubert A., Guide to ASAR Geocoding, Issue 1.0, 19.03.2008