Monitoring report of old growth forests changes in the Ukrainian Carpathians for January 2023

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Data: 16.02.23
Monitoring report of old growth forests changes in the Ukrainian Carpathians for January 2023

In January, we continued monitoring old growth forests on Sentinel-1 radar and optical Sentinel-2 satellite images (Fig. 1). During the analysis, we also used images from the Google Earth Engine website (https://code.earthengine.google.com).


 Fig.  1 Selection of Sentinel-2 optical satellite images.


 Such a composite image uses only cloud-free areas from all available images for the studied period.  The January cloudless composite was a bad quality for interpretation because the area was partially covered by the images.


The available cloud-free Landsat-8 images also did not cover the entire available territory (Fig. 2).


 Fig.  2. Landsat-8 optical satellite images for January


 Landsat-8 optical satellite images for January were covered by clouds and was a bad quality for interpretation, therefore, 2 Sentinel-1 radar images were used (Fig. 3).


 The radar images were pre-processed in order to eliminate "noise" and to bring them to a view suitable for visual decoding.  With the help of routines, the images were adjusted: taking into account the parameters of the shooting orbit, radiometric calibration, filtering and geometric correction.


 Fig. 3.  A fragment of the Sentinel-1 radar satellite image for the studied area (areas of particularly valuable plantations are marked in red).


 The image is synthesized on the basis of vertical and horizontal polarization of radar radiation.  Such an image was used for visual analysis of the state of ancient plantations based on satellite images.


 For monitoring, 1,099 plots with an area of 12,120.1 hectares have been determined, which is 70.1% of the total number of accepted primeval forests.


 As a result of such an analysis, no changes were detected in the territory of old growth forests.



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