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- Title
Comparative Analysis of Remote Sensing and Geo-Statistical Techniques to Quantify Forest Biomass.
- Authors
Ahmad, Naveed; Ullah, Saleem; Zhao, Na; Mumtaz, Faisal; Ali, Asad; Ali, Anwar; Tariq, Aqil; Kareem, Mariam; Imran, Areeba Binte; Khan, Ishfaq Ahmad; Shakir, Muhammad
- Abstract
Accurately characterizing carbon stock is vital for reporting carbon emissions from forest ecosystems. We studied the estimation of biomass using Sentinel-2 remote sensing data in moist temperate forests in the Galies region of Abbottabad Pakistan. Above-ground biomass (AGB), estimated from 60 field plots, was correlated with vegetation indices obtained from Sentinel-2 image-to-map AGB using regression models. Furthermore, additional explanatory variables were also associated with AGB in the geo-statistical technique, and kriging interpolation was used to predict AGB. The results illustrate that the atmospherically resistant vegetation index (ARVI) is the best index (R2 = 0.67) for estimating AGB. In spectral reflectance, Band 1(Coastal Aerosol 443 nm) performs better than other bands. Multiple linear regression models calibrated with ARVI, NNIR and NDVI yielded better results (R2 = 0.46) with the lowest RMSE (48.53) and MAE (38.42) and were therefore considered better for biomass estimation. On the other hand, in the geo-statistical technique, distance to settlements, ARVI and annual precipitation were significantly correlated with biomass compared to others. In the stepwise regression method, the forward selection resulted in a very significant value (less than 0.000) for ARVI. Therefore, it can be considered best for prediction and used to interpolate AGB through kriging. Compared to the geo-statistical technique, the remote sensing-based models performed relatively well. Regarding potential sites for REDD+ implementation, temporal analysis of Landsat images showed a decrease in forest area from 8896.23 ha in 1988 to 7692.03 ha in 2018. Therefore, this study concludes that the state-of-the-art open-source sensor, the Sentinel-2 data, has significant potential for forest biomass and carbon stock estimation and can be used for robust regional AGB estimation with acceptable accuracy and frequent availability.
- Subjects
PAKISTAN; REMOTE sensing; BIOMASS estimation; GEOLOGICAL statistics; KRIGING; SPECTRAL reflectance; TEMPERATE forests; IMAGE analysis
- Publication
Forests (19994907), 2023, Vol 14, Issue 2, p379
- ISSN
1999-4907
- Publication type
Article
- DOI
10.3390/f14020379