Johan E. S. Fransson
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View article: Mapping Boreal Forest Vitality Using Drone-Based Multispectral Time-Series and Object-Based Classification
Mapping Boreal Forest Vitality Using Drone-Based Multispectral Time-Series and Object-Based Classification Open
Monitoring tree vitality in boreal forests is increasingly critical under escalating climate stress and pest disturbances. This study presents a novel UAV-based framework integrating multispectral imaging, object-based classification, and …
View article: Detecting Root Rot Infected Norway Spruce Trees Using Multispectral and LiDAR UAV Data
Detecting Root Rot Infected Norway Spruce Trees Using Multispectral and LiDAR UAV Data Open
Root rot caused by fungi in the Heterobasidion spp. and Armillaria spp. is one of the most economically significant problems in the European forest industry. Early detection remains challenging due to the lack of external visual symptoms i…
View article: Comparative Analysis of YOLOv8 and YOLOv11 on Tree Detection Using UAV RGB and Laser Scanning Data
Comparative Analysis of YOLOv8 and YOLOv11 on Tree Detection Using UAV RGB and Laser Scanning Data Open
To promote sustainable forest management planning including biodiversity monitoring and to enable accurate estimates of stem volume, above-ground biomass, and carbon stocks, tree identification is essential to contemporary forest inventory…
View article: A managed boreal forest landscape in northern Sweden is a persistent net carbon sink despite large inter-annual weather anomalies
A managed boreal forest landscape in northern Sweden is a persistent net carbon sink despite large inter-annual weather anomalies Open
The future role of boreal forests in the global carbon cycle is uncertain given the rapid climate change in high latitudes. At the landscape scale, heterogeneity in stand age and land cover, contributions from terrestrial and aquatic fluxe…
View article: Variations in Ecosystem‐Scale Methane Fluxes Across a Boreal Mire Complex Assessed by a Network of Flux Towers
Variations in Ecosystem‐Scale Methane Fluxes Across a Boreal Mire Complex Assessed by a Network of Flux Towers Open
High latitude mires are key ecosystems in the context of climate change since they store large amounts of carbon while constituting an important natural source of methane (CH 4 ). However, while a growing number of studies have investigate…
View article: VHRTrees: a new benchmark dataset for tree detection in satellite imagery and performance evaluation with YOLO-based models
VHRTrees: a new benchmark dataset for tree detection in satellite imagery and performance evaluation with YOLO-based models Open
Natural and planted forests, covering approximately 31% of the Earth’s land area, are crucial for global ecosystems, providing essential services such as regulating the water cycle, soil conservation, carbon storage, and biodiversity prese…
View article: Object Identification in Land Parcels Using a Machine Learning Approach
Object Identification in Land Parcels Using a Machine Learning Approach Open
This paper introduces an AI-based approach to detect human-made objects and changes in these on land parcels. To this end, we used binary image classification performed by a convolutional neural network. Binary classification requires the …
View article: ForestMap: The next generation of forest maps - adapting a Nordic success story
ForestMap: The next generation of forest maps - adapting a Nordic success story Open
Building on the positive experiences with open forest map data in Scandinavia, it is evident that extending a similar solution globally has the potential to revolutionize forest management and business on a worldwide scale. While forest ma…
View article: Tower-based radar observations of sub-daily water dynamics in boreal forests
Tower-based radar observations of sub-daily water dynamics in boreal forests Open
Radar remote sensing observations are predominantly affected by the concentration and spatial distribution of water in natural scenes. This motivates the utilization of high-resolution spaceborne radar observations for monitoring the water…
View article: Linking High-Resolution UAV-Based Remote Sensing Data to Long-Term Vegetation Sampling—A Novel Workflow to Study Slow Ecotone Dynamics
Linking High-Resolution UAV-Based Remote Sensing Data to Long-Term Vegetation Sampling—A Novel Workflow to Study Slow Ecotone Dynamics Open
Unravelling slow ecosystem migration patterns requires a fundamental understanding of the broad-scale climatic drivers, which are further modulated by fine-scale heterogeneities just outside established ecosystem boundaries. While modern U…
View article: Modelling forest road trafficability with satellite-based soil moisture variables
Modelling forest road trafficability with satellite-based soil moisture variables Open
Recent decades have seen increased temperatures and precipitation in the Nordic countries with long-term projections for reduced frost duration and depth. The consequence of these trends has been a gradual shift of delivery volumes to the …
View article: Prediction of Site Index and Age Using Time Series of TanDEM-X Phase Heights
Prediction of Site Index and Age Using Time Series of TanDEM-X Phase Heights Open
Site index and stand age are important variables in forestry. Site index describes the growing potential at a given location, expressed as the height that trees can attain at a given age under favorable growing conditions. It is traditiona…
View article: On the uncertainty in estimates of the carbon balance recovery time after forest clear‐cutting
On the uncertainty in estimates of the carbon balance recovery time after forest clear‐cutting Open
An essential metric for describing carbon dynamics in managed forest landscapes is the recovery time of the carbon balance after clear-cutting. Here, we demonstrate how the age-dependent mathematical trajectory is affected by both the sele…
View article: Five-year inter-annual variation in the net landscape carbon balance of a managed boreal forest landscape in Sweden
Five-year inter-annual variation in the net landscape carbon balance of a managed boreal forest landscape in Sweden Open
The boreal biome exchanges large amounts of carbon (C) with the atmosphere and thus significantly affects the global climate. A managed boreal landscape typically consists of various sinks and sources of carbon dioxide (CO2), methane (CH4)…
View article: Landscape‐variability of the carbon balance across managed boreal forests
Landscape‐variability of the carbon balance across managed boreal forests Open
Boreal forests are important global carbon (C) sinks and, therefore, considered as a key element in climate change mitigation policies. However, their actual C sink strength is uncertain and under debate, particularly for the actively mana…
View article: Data set for "Landscape-variability of the carbon balance across managed boreal forests"
Data set for "Landscape-variability of the carbon balance across managed boreal forests" Open
This data set is a compilation of biometric- and chamber-based annual CO2 flux estimates obtained during the period 2016–2018. Data were collected in 50 main forest stands within the Krycklan Catchment Study (KCS, https://www.slu.se/Kryckl…
View article: Data set for "Landscape-variability of the carbon balance across managed boreal forests"
Data set for "Landscape-variability of the carbon balance across managed boreal forests" Open
This data set is a compilation of biometric- and chamber-based annual CO2 flux estimates obtained during the period 2016–2018. Data were collected in 50 main forest stands within the Krycklan Catchment Study (KCS, https://www.slu.se/Kryckl…
View article: Data set for "Overstory dynamics regulate the spatial variability in forest-floor CO2 fluxes across a managed boreal forest landscape"
Data set for "Overstory dynamics regulate the spatial variability in forest-floor CO2 fluxes across a managed boreal forest landscape" Open
This data set is a compilation of forest stand characteristics, forest-floor environmental conditions, soil properties, ecosystem carbon stocks, and annual forest-floor CO2 fluxes. The data set is composed by 3-year mean annual values obta…
View article: Data set for "Overstory dynamics regulate the spatial variability in forest-floor CO2 fluxes across a managed boreal forest landscape"
Data set for "Overstory dynamics regulate the spatial variability in forest-floor CO2 fluxes across a managed boreal forest landscape" Open
This data set is a compilation of forest stand characteristics, forest-floor environmental conditions, soil properties, ecosystem carbon stocks, and annual forest-floor CO2 fluxes. The data set is composed by 3-year mean annual values obta…
View article: Extraction of Spectral Information from Airborne 3D Data for Assessment of Tree Species Proportions
Extraction of Spectral Information from Airborne 3D Data for Assessment of Tree Species Proportions Open
With the rapid development of photogrammetric software and accessible camera technology, land surveys and other mapping organizations now provide various point cloud and digital surface model products from aerial images, often including sp…
View article: Predictions of Biomass Change in a Hemi-Boreal Forest Based on Multi-Polarization L- and P-Band SAR Backscatter
Predictions of Biomass Change in a Hemi-Boreal Forest Based on Multi-Polarization L- and P-Band SAR Backscatter Open
Above-ground biomass change accumulated during four growth seasons in a hemi-boreal forest was predicted using airborne L- and P-band synthetic aperture radar (SAR) backscatter. The radar data were collected in the BioSAR 2007 and BioSAR 2…
View article: Spatial variability of the net ecosystem production and its component fluxes across a managed boreal forest landscape in Sweden: A biometric and chamber data-based analysis
Spatial variability of the net ecosystem production and its component fluxes across a managed boreal forest landscape in Sweden: A biometric and chamber data-based analysis Open
<p>A managed boreal forest landscape is a diverse successional mosaic of clear-cuts to old-growth stands of different species growing on a variety of soil types. Consequently, this high spatial heterogeneity strongly impacts the fore…
View article: National Forest Biomass Mapping Using the Two-Level Model
National Forest Biomass Mapping Using the Two-Level Model Open
This article uses the two-level model (TLM) to predict above-ground biomass (AGB) from TanDEM-X synthetic aperture radar (SAR) data for Sweden. The SAR data were acquired between October 2015 and January 2016 and consisted of 420 scenes. T…
View article: Complementarity of X-, C-, and L-band SAR Backscatter Observations to Retrieve Forest Stem Volume in Boreal Forest
Complementarity of X-, C-, and L-band SAR Backscatter Observations to Retrieve Forest Stem Volume in Boreal Forest Open
The simultaneous availability of observations from space by remote sensing platforms operating at multiple frequencies in the microwave domain suggests investigating their complementarity in thematic mapping and retrieval of biophysical pa…