Sirvi Autor "Medianovskyi, Kyrylo" järgi

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Exploring DeepSense Neural Network Architecture for Farming Events Detection
(Tartu Ülikool, 2020) Medianovskyi, Kyrylo; PhD. Hadachi, Amnir, juhendaja; Tartu Ülikool. Loodus- ja täppisteaduste valdkond; Tartu Ülikool. Arvutiteaduse instituut
Nowadays satellite imagery became widely available and found to be applicable in a range of different areas. Agriculture is one of those domains. With the help of imagery data there is a set of processes that can be automatized. Thousands of people across the European Union are involved in field inspection. They are checking the crop types and take a record of mowing events that happen on the parcels. Estonia has a relatively high level of cloud coverage and rains during a vegetation season. That leads to interruptions and noises in satellite imagery data. A noise tolerating automated mowing event detection system is required. For this thesis Sentinel-1 coherence for VV and VH polarisation together with Sentinel-2 normalized difference vegetation index were chosen as the main features to build a mowing event recognition system. The architecture DeepSense is implemented and evaluated as a mowing event detection mechanism. The system was trained on Estonia 2018 labeled data containing information about over 1700 fields. An optimal configuration of hyper-parameters was obtained based on experiments with the architecture. Proposed modification of the DeepSense framework allowed to reach 94% event accuracy and 93% end of season event accuracy obtained from 5-fold cross-validation. The DeepSense implementation allowed to outperform a purely convolutional model based on the end of season accuracy metric (93% against 90%). The proposed architecture can be adopted for the mowing event detection tasks.