dc.description.abstract | In Sri Lanka, Seasonal paddy field
area mapping is still doing based on the
traditional methods with poor technologies.
Therefore this research focuses on the
machine approach of mapping paddy fields
area accurately on remote sensing data taken
from the satellite. Multi-temporal Sentinel1A Synthetic Aperture Radar(SAR) data was
used to map the spatial distribution of the
secretary’s divisions paddy area in the
Ampara district during the period from April
2019 to September 2019. The classifying
algorithms were mainly used under the
multi-temporal spectral filter classification
with 11 dual-polarization(VH/VV) SAR using
SNAP, QGIS, ENVI tools. The Time series
model was used for each VH and VV bands
separately. According to minimum and
maximum value of both VH and VV bands,
paddy field area was classified using
deference of min and max value respectively
The overall precision of paddy fields is
shown to be 0.92 Also use random forest
classification method to processed images
with ENVI and It shows 0.86 accuracy rate.
Each divisional secretary area showed
accurate paddy classification according to
non-remote sensing data provided by the
district agriculture office of Ampara. This
method can easily be used to classify paddy
cultivation areas than its traditional
methods. Also, it is low cost and very fast
method. As further development, Rice
prediction model is proposed using the same
classified area with vegetation indexes of
Sentinel 2 imagery. | en_US |