Primary processing technology for Kanopus-V1 and BKA data within IMC software is fully automated and consists of following steps:
|1||Georeferencing improvement using reference points.||Manual/ optional||IMC||Georeferencing error in degrees.|
|2||Obtaining DEM for scene’s geometric correction (GMTED 2010, 250m).||Automatic||IMC||DEM in IMG file format|
|3||RPC-transformation of micro-frames considering the error estimated during stage 1.||Automatic||IMC||Transformed spectral bands in IMF file format|
|4||Formation of spectral bands out of micro-frames||Automatic||IMC||5 bands (4 multispectral + PAN) in IMG format|
|5||Eliminating offset between 4 spectral bands and panchromatic band. Formation of 4 multispectral bands image.||Automatic||IMC||File in IMG format|
|6||Panchromatic image resolution improvement.||Automatic||IMC||Resolution increase by 10-12%|
|7||Formation of pansharpened RGB image in natural colors with resolution of panchromatic image.||Automatic||IMC||File in IMG format|
|8||Noise elimination, Signal/noise ratio before processing = 10 dB.||Automatic||IMC||Signal/noise ratio after processing = 13 dB.|
|9||Georeferencing accuracy and image resolution evaluation.||Automatic||IMC||Georeferencing accuracy ~ 10m|
Operator should perform following tasks manually:
As an input data level 1 data is used ( sets of separate micro-frames for different spectral bands of a single scene with RPC, w/o radiometric correction, w/o orthorectification).
On this stage orthorectification of the micro-frames using digital elevation model and RPC and correction to UTM (WGS84) map projection are performed. Before the automated orthorectification process is begun, georeferencing error can be calculated for several micro-frames. Optionally, the coordinates of reference points can be set for more accurate georeferencing improvement.
On this stage separate micro-frames are being stitched into color bands. Innovative radiometric correction algorithm makes it possible to effectively eliminate brightness difference between micro-frames. As a result of the processing 5 files in IMG file format are created (4 for each multispectral band and 1 for panchromatic band).
On this stage offset between 4 spectral bands and panchromatic band is eliminated. As a result of the processing 5 files in IMG file format are created (4 for each multispectral band and 1 for panchromatic band)
Level 2B, 2B1, 4B output data can be obtained with the help of additional reference data and DEM (accuracy of output data depends on the accuracy of reference data) .
Panchromatic image (processing level 2A, 2B):
Multispectral image (processing level 2A1, 2B1)
Pansharpened image (processing level 4A, 4B)
|✔ scene borders in SHP format ✔ metadata in XML format for each image|