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Pansharpening

A detailed review of the pansharpening tool
for improving the quality of space images.

What is that?

Spatial resolution - the size of the smallest detail of the terrain reproduced on the image is determined by the pixel size. That is, an image with spatial resolution of 1 m has a pixel size of 1x1 m.

Types of spatial resolution of satellite images:

  • very low (worse than 100 m);
  • low (15-100 m)
  • medium (5-15 m)
  • high (1-2.5 m);
  • ultra-high (0.3-1 m).

Pansharpening allows a single image to be obtained from the panchromatic and multispectral channels of the two products. The panchromatic channel usually has higher spatial resolution, the multispectral channel has lower spatial resolution.

The image shows the image from Kanopus-V. On the left - panchromatic image. On the right - multispectral.

How the pansharpening
feature can help

Pansharpening is used to:

  • creating an image in natural colors with panchromatic channel resolution;
  • creating high-definition map data;
  • to more accurately decode the results of thematic processing;
  • for more accurate identification of individual objects.
Example of synthesized image from Kanopus-V made in IMC.

Example of pansharpening

In the IMC PC, pan-sharpening is performed automatically, the operator only needs to specify color channels.

Before performing pan-sharpening it is necessary to collect a composite of multispectral and panchromatic data on which the processing is planned.

Then it is necessary to choose the method of pan-sharpening according to ESRI or IHS formulas, and there is also a possibility to include the near-infrared channel in the calculation.

01 / 05
The image shows a panchromatic image after pre-processing in IMC PC from Kanopus-V satellite to the territory of Samara region. On the left is the original image, on the right is the enlarged fragment.
The image shows a multispectral image after preliminary processing in IMC with Kanopus-V satellite over the territory of Samara region. On the left is the original image, on the right is the enlarged fragment.
The image shows multispectral image after size increase to panchromatic resolution. Left - original image, right - enlarged fragment.
Multispectral image after pancharpening. On the left - original image, on the right - enlarged fragment.