Abstract
In a vast agrarian country like India, multifunctional agroforestry land use systems play significant role. Reliable scientific database on agroforestry systems are essential to implement National Agroforestry Policy of Government of India. This study is a flagship initiative to develop a scalable geospatial approach for assessment of agroforestry resources using sub-meter satellite images and Deep Learning (DL) techniques. A reliable methodology was developed to quantify tree components in Indian agroforestry systems, using U-Net based DL architecture pre-trained on ResNet 34 backbone. 12,628 labelled training samples and in-season ground truth information from 1,767 locations, representing diverse agro-ecological regimes from 6 study areas were utilised for DL model development. Model accuracy was estimated as 93.72 percent, underscoring its robustness to extract major tree components like individual trees on farmland, linear and block plantations. DL outputs were integrated with harmonized Land Use Land Cover maps at 1:10,000 scale, to arrive at integrated agroforestry land use map with 10–15 classes, with an overall accuracy of 86.5 percent and kappa coefficient of 0.847. This is the first detailed study in India, adopting AI based technique for classifying tree components using sub-meter images within large geographic extent of 25,501 km2. It is a major step towards establishing improved geospatial procedure for scientific assessment of agroforestry systems to meet India’s commitments to UNFCCC and Intended Nationally Determined Contributions at COP21 in Paris on climate and environment under International Charters. This robust, DL based approach offers potential applications in ecological research, upliftment of agrarian community, sustainability and environmental policy planning.
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This study utilizes very high resolution satellite images of 0.6 to 0.7 m. Satellite images of 1 m or better spatial resolution cannot be shared in public domain, as per National Geospatial Policy of India.
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Acknowledgements
Authors express their sincere gratitude to Indian Space Research Organisation (ISRO) Headquarters, Bengaluru and various wings of Ministries of Government of India for the facilitation and approval of Letter of Agreement for this study; FAO team members- Mr. Tomio Shichiri (FAO Representative in India), Mr. Illias Animon (Lead Technical Officer, FAO-RAP, Bangkok), Dr. Konda Reddy Chavva (Assistant FAO Representative in India, Programme) and Ms. Athira Sobhana (Project Associate, FAO-India); NRAA team members- Dr. Ashok Dalwai (CEO) & Mr. B. Rath (Technical Expert, WM) for their involvement and overall contribution in the study. The support received from State Forest Departments of Indian states, namely Karnataka, Uttar Pradesh, Haryana, Rajasthan and Assam for in-season field data collection is gratefully acknowledged. We are also thankful to Ms. D. Rama Devi, Scientist, NRSC Data Centre (NDC), NRSC for providing large number of satellite imageries in a timely manner. The contribution of scientists from RRSCs / NRSC, namely Mr. H.M. Ravishankar, Dr. D. Chakraborty, Mr. Y.K. Srivastava, Mr. Ashish Shrivastava, Mr. T.P. Girish Kumar, Mr. Naresh Nagamalle and the support provided by other technical & administrative staff of NRSC and Regional Centres during project execution is thankfully acknowledged.
Funding
This study was funded by Food and Agriculture Organisation (United Nations), New Delhi under Technical Cooperation Programme (TCP/IND/3710) with National Remote Sensing Centre, Indian Space Research Organisation, Government of India.
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Conceptualization- JCS, HR, ST, VPV; Methodology- HR, VPV, ST; Software- VPV, CB; Validation- NMK, RSS, MVB, NK; Formal analysis- RSS, NK, ST, VPV, CB; Investigation- ST, CB, NMK, MVB, JKM, ASS, AG, SRNR, PKD, TK, AP, MKV, SS; Data curation- AKP, HRS, ST, MVB, NMK, RSS, NK, VPV, CB, AS, JKM, ASS, SKR, AG, SRNR, PKD, TK, AP, MKV, SS; Writing (original draft)- ST, VPV; Writing (review & editing)—HR, JCS; Visualization- ST, VPV, RSS, MVB, HR; Supervision- HR, JCS, SKS, SRB, PC, VAO, BAK; Project administration- HR, JCS, CK; Funding acquisition- SRB, JCS, DS.
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Trivedi, S., Vinod, P.V., Chandrasekaran, B. et al. Geospatial assessment of agroforestry land use systems using very high-resolution satellite images and artificial intelligence. Agroforest Syst (2024). https://doi.org/10.1007/s10457-024-01042-2
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DOI: https://doi.org/10.1007/s10457-024-01042-2