Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2025
Sammendrag
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Forfattere
Ole Jakob Bae NæssSammendrag
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Forfattere
Jarle Systad Johan HusebråtenSammendrag
Mangrove forests are important ecosystems that store large amounts of carbon, protect coastlines, and provide habitats for a variety of marine species. Despite their ecological significance, mangrove forests are highly threatened. It is therefore crucial to map and monitor these areas to protect them. The purpose of this master's thesis is to map the distribution of mangrove forests and estimate their above-ground biomass in Ghana. Optical satellite images from Sentinel-2 were used for the classification. The biomass estimates were based on a combination of satellite images and LiDAR data from GEDI (Global Ecosystem Dynamics Investigation). In addition, fieldwork was conducted in Ghana to collect training and test data for the models. The global dataset Global Mangrove Watch (GMW) was used as a reference to assess the quality of the classification results. The distribution of the mangrove forest was mapped using Object-Based Image Analysis (OBIA), where the satellite images are divided into segments based on reflectance values in different spectral bands. The segments were then classified using the machine learning methods Support Vector Machine (SVM) and Random Forest (RF). To calculate the biomass, regression models were developed combining GEDI data with bands and indices from Sentinel-2. The models were evaluated based on the coefficient of determination (R²) and root mean square error (RMSE). The results show that the combination of Sentinel-2 data and local field measurements provides more accurate maps than existing global datasets. Among the two classification methods, SVM performed best on the validation data, with an F1-score of 96.5%, compared to 75.4% for GMW. The SVM model estimated the total area of mangrove forest in Ghana to be 143.54 km². The above-ground biomass in Ghana’s mangrove forest was estimated to be approximately 313,000 tons, with an average of about 21.8 tons per hectare. The best model for biomass estimation was the Gradient Boosting model, with a multiple regression analysis based on all attributes achieving an R² value of 0.38 and an RMSE of 24.5.
Forfattere
Jakob JunkersSammendrag
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Forfattere
Clive M. Brasier Niklaus J. Grünwald Tyler B. Bourret Francine Govers Bruno Scanu David E.L. Cooke Tanay Bose David L. Hawksworth Abad Gloria Abad Albarracin Victoria Albarracin Wael Alsultan Astrid E. Altamirano-Junqueira Arild R. Arifin Matthew J. Arnet Herbert Dustin R. Aumentado József Bakonyi Wei H. Belisle Alessandra Benigno John C. Bienapfl Guillaume J. Bilodeau Jaime E. Blair Leticia Botella Andrea Brandano Santa Olga Cacciola Ignazio Carbone Vanina L. Castroagudin Narayanan Chaendaekattu Jonathan D. Consford Tamara Corcobado Paul A. Covey Hazel A. Daniels Antonio Deidda Anne E. Dorrance Erika N. Dort André Drenth Fryni Drizou Edouard Evangelisti Sebastian N. Fajardo Yufeng Fang Christopher M. Ference Susan J. Frankel Erica M. Goss David I. Guest Giles E.S.J. Hardy Anna R.H. Harris Mehari Desta Hawku Kurt Heungens Chuanxue Hong Ian J. Horner Marília Horta Jung Olumayowa J. Iyanda Brittney-Aidan Jamieson Steven N. Jeffers Howard S. Judelson Muhammad Junaid Eleni Kalogeropoulou Sophien Kamoun Seogchan Kang Takao Kasuga Tomáš Kudláček Jared LeBoldus Christopher A. Lee DeWei Li Alejandro K. Llanos Horacio D. Lopez-Nicora Helena Machado Gaetano Magnano di San Lio Cristiana Maia Kajal Mandal Patricia Manosalva Frank N. Martin Michael E.H. Matson Rebecca L. McDougal John M. McDowell Richard W. Michelmore Ivan Milenković Salvatore Moricca Reza Mostowfizadeh-Ghalamfarsa Zoltán Á. Nagy Ekaterina V. Nikolaeva Paula Ortega-López Trudy Paap Camilo H. Parada-Rojas Francesca Peduto Hand Ana Pérez-Sierra Martin Pettersson Pramod Prasad Alina S. Puig Milica Raco Nasir A. Rajput Jean B. Ristaino Suzanne Rooney-Latham Michael F. Seidl Simon F. Shamoun Alejandro Solla Christoffel F.J. Spies Martha A. Sudermann Tedmund J. Swiecki Miaoying Tian Sucheta Tripathy Seiji Uematsu Kris Van Poucke Aikaterini E. Vichou Monika Walter Joan F. Webber Nari M. Williams Michael J. Wingfield Dhananjay Yadav Xiao Yang Thomas JungSammendrag
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Forfattere
Gunnhild SøgaardSammendrag
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Forfattere
Chloé GrieuSammendrag
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Forfattere
Erik Framstad Geir-Harald Strand Linda Aune-Lundberg Ulrike Bayr Kathrin Bögelsack Sylvie Clappe Carl William Lund Jonatan Marquez Ida Marielle MiennaSammendrag
Norge – grunnkart arealanalyse – økosystemtypologier – klassekarakteristikk – marine økosystemer – fjellavgrensing - Norway – map for extent analysis – ecosystem typologies – class characteristics – marine ecosystems – mountain delimitation
Redaktører
Lars Johan RustadSammendrag
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Redaktører
Lars Johan RustadSammendrag
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