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Primary processing of materials
from the Kanopus-V satellite

Specifics of primary processing
Kanopus-V satellite images in the IMC PC

Kanopus-V

«Kanopus-V» No. 1 is a Russian spacecraft for operational monitoring of man-made and natural emergencies. It was launched on July 22, 2012 from Baikonur Cosmodrome. Data received from Kanopus-B contain RPC polynomials tool to improve image accuracy and speed up data processing.

"BKA" (Belarusian spacecraft) was launched together with the Russian satellite "Kanopus-V" and has identical technical characteristics.

Stages of Kanopus-V spacecraft materials processing

The technology of processing materials from Kanopus-V and BKA satellites in the IMAGE MEDIA CENTER program complex is fully automated and includes the following stages:

Processing stage Processing result
1. Refinement of route georeferencing by reference points (mode: manual/not mandatory). Georeferencing error in degrees
2. Obtaining terrain relief on the route for correction of survey geometry (GMTED 2010, 250 m). Terrain in IMG format
3. RPC-transformation on separate channels taking into account terrain and georeferencing error defined at step 1. Transformed channels in IMG format
4. Stitching of microframes on separate channels per shooting route. 5 channels (PAN+4 MS) in IMG format
5. Binding of four spectral channels to the panchromatic channel to eliminate the bias between channels. Composite image assembly from spectral channels. File in IMG format with 4 channels
6. Enhancement of panchromatic image detail. Increase of detail by 10-12%
7. Obtaining a complexed image in natural colors with panchromatic image resolution. File in IMG format.
8. Elimination of noise in the image. Before processing signal/noise ratio=10 dB After processing signal/noise=13 dB.
9. Checking the accuracy of georeferencing and resolution of the obtained materials. Accuracy of georeferencing about 10 m (with OT)

Input data

Input data are materials of processing level 1 - one or a group of microframes, acquired in different spectral channels, belonging to the same survey route, without radiometric correction, without orthotransforming imaging route, without radiometric correction, without orthotransformation, not color-synthesized, with coefficients of RPC-polynomials.

Input data of processing level 1. Left - microframe in spectral channels: blue (0.46-0.52 µm), green (0.52-0.60 µm), red (0.63-0.69 µm), near-IR (0.75-0.86 µm). In the middle is the microframe in the panchromatic channel (0.45-0.85 µm). The last is the binding information (RPC) for each microframe in XML format to each channel.

Orthotransformation of individual microframes

The process of orthotransformation of individual microframes. On the left - the original microframe. On the right - digital elevation model in .tiff format.

At this stage orthotransformation of individual microframes is performed taking into account RPC-coefficients and digital elevation model into UTM projection on WGS-84 reference ellipsoid. Before automatic processing is started, the route georeferencing can be refined by calculating the georeferencing error on several microframes. GMTED 2010 relief (250 m) in IMG format is used for processing. In addition, coordinates of reference points can be specified to refine the georeferencing.

Microframe stitching on separate channels
and radiometric correction

At this stage the stitching of microframes on separate channels is performed using correction methods and the brightness of microframes is corrected using an innovative radiometric correction algorithm. As a result of this stage five files (panchromatic and four spectral channels) in IMG format are formed.

Examples of microframes stitching. On the right - for "BKA" - microframe overlap zone of 20 pixels. On the left - for " Kanopus-V" - microframe overlap zone of 50 pixels.

Channel meshing

Example of channel merging. On the left - the original image, on the right - the result of IMC processing.

At this stage the offset between channels is eliminated by linking four spectral channels to the panchromatic channel. As a result of this stage five files (panchromatic and four corrected spectral channels) in IMG format are formed.

Output data

Output data are the following materials:

  • Processing level 2A product (Panchromatic image obtained by stitching of microframes, transformed into cartographic projection according to the data of onboard automatic navigation system to the average altitude with planned accuracy (RMS) not worse than 50m);
  • Processing level 2A1 product (Color-synthesized image from 4 spectral channels (RGB+IR), transformed into map projection based on data of onboard automatic navigation system at mean altitude with planned accuracy (RMS) not worse than 50m);
  • Processing level 4A product (Complex image from panchromatic (processing level 2A) and multispectral (processing level 2A1) images of the same territory (Pansharpening), with planned accuracy (RMS) not worse than 50m);
  • Passport to each output image in XML format;
  • Frame for the survey route in SHP format.

If reference data and DEM are available, output data are products of processing levels 2B, 2B1, 4B (images orthotransformed using reference data and DEM, planned accuracy of which depends on accuracy of reference information).

The image shows the output data from the Kanopus-V satellite. On the left - panchromatic image (processing level 2A, 2B), the second image - multispectral image (processing level 2A1, 2B1) standard processing, the third - complexed image (processing level 4A, 4B) additional processing
View the user manual on primary
processing of data from the Kanopus-V spacecraft