A5037771223- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Remote Sensing and LiDAR Applications
- Water Quality Monitoring and Analysis
- Cryospheric studies and observations
- Plant responses to elevated CO2
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Urban Heat Island Mitigation
- Polar Research and Ecology
- Land Use and Ecosystem Services
- Remote-Sensing Image Classification
- Leaf Properties and Growth Measurement
- Species Distribution and Climate Change
- Geochemistry and Geologic Mapping
- Spectroscopy and Laser Applications
- Potato Plant Research
- Peatlands and Wetlands Ecology
- Crop Yield and Soil Fertility
- Atmospheric Ozone and Climate
- Mineral Processing and Grinding
- Calibration and Measurement Techniques
- Image and Object Detection Techniques
- Chalcogenide Semiconductor Thin Films
- Image Retrieval and Classification Techniques
Universitat de València
2023
University of Edinburgh
2011-2022
National Centre for Earth Observation
2019-2021
University of Helsinki
2020
Natural Environment Research Council
2015
Newcastle University
2015
Scotland's Rural College
2015
Boeing (United States)
1985
Abstract. Measurements of e-folding depth, nadir reflectivity and stratigraphy the snowpack around Concordia station (Dome C, 75.10° S, 123.31° E) were undertaken to determine wavelength dependent coefficients (350 nm 550 nm) for light scattering absorption calculate potential fluxes (depth-integrated production rates) nitrogen dioxide (NO2) from due nitrate photolysis within snowpack. The top 80 cm Dome C generally consists three main layers:- a surface soft windpack (not ubiquitous), hard...
Solar-induced Fluorescence (SIF) has an advantage over greenness-based Vegetation Indices in detecting drought. This is the mechanistic coupling between SIF and Gross Primary Productivity (GPP). Under water stress, tends to decrease with photosynthesis, due increase non-photochemical quenching (NPQ), resulting rapid and/or sustained reductions fluorescence quantum efficiency (ΦF). Water stress also affects vegetation structure via highly dynamic changes leaf angular distributions (LAD) or...
Imaging and non-imaging spectroscopy employed in the field from aircraft is frequently used to assess biochemical, structural, functional plant traits, as well their dynamics an environmental matrix. With increasing availability of high-resolution spectroradiometers, it has become feasible measure fine spectral features, such those needed estimate sun-induced chlorophyll fluorescence (F), which a signal related photosynthetic process plants. The measurement F requires highly accurate precise...
The interest of the scientific community on remote observation sun-induced chlorophyll fluorescence (SIF) has increased in recent years. In this context, hyperspectral ground measurements play a crucial role calibration and validation future satellite missions. For reason, European cooperation science technology (COST) Action ES1309 OPTIMISE compiled three papers instrument characterization, measurement setups protocols, retrieval methods (current paper). This study is divided two sections;...
Accurately determining field-of-view has rarely been considered in field spectroscopy where specifications for fore optics used are generally limited and the influence of spectroradiometer considered. The issue can be compounded with full wavelength spectroradiometric systems which include multiple spectrometers. In these systems, size alignment viewing technology adopted to transfer light from optic individual spectrometers may cause significant nonuniformity spectral response across area...
Photolytic production rates of NO, NO 2 and OH radicals in snow the total absorption spectrum due to impurities snowpack have been calculated for Ocean‐Atmosphere‐Sea‐Ice‐Snowpack (OASIS) campaign during Spring 2009 at Barrow, Alaska. The photolytic rate cross‐sections were from measurements stratigraphy, light penetration depths ( e ‐folding depths), nadir reflectivity (350–700 nm) UV broadband atmospheric radiation. Maximum x fluxes owing combined nitrate nitrite photolysis as 72 nmol m −2...
Leaf area index (LAI) estimates can inform decision-making in crop management. The European Space Agency’s Sentinel-2 satellite, with observations the red-edge spectral region, monitor crops globally at sub-field spatial resolutions (10–20 m). However, satellite LAI require calibration ground measurements. Calibration is challenged by heterogeneity and scale mismatches between field Unmanned Aerial Vehicles (UAVs), generating high-resolution (cm-scale) estimates, provide intermediary that we...
Leaf Area Index (LAI) and chlorophyll content are strongly related to plant development productivity. Spatial temporal estimates of these variables essential for efficient precise crop management. The availability open-access data from the European Space Agency’s (ESA) Sentinel-2 satellite—delivering global coverage with an average 5-day revisit frequency at a spatial resolution up 10 metres—could provide unprecedented (i.e., sub-field) resolution. Using synthetic data, past research has...
Growing interest in the proximal sensing of sun-induced chlorophyll fluorescence (SIF) has been boosted by space-based retrievals and up-coming missions such as FLuorescence EXplorer (FLEX). The European COST Action ES1309 “Innovative optical tools for ecophysiological processes” (OPTIMISE, ES1309; https://optimise.dcs.aber.ac.uk/) produced three manuscripts addressing main current challenges this field. This article provides a framework to model impact different instrument noise bias on...
Abstract. We tested the hypothesis that diffuse radiation from cloudy and overcast skies penetrates canopy more effectively than direct clear skies. compared flux density spectral properties of (around solar noon (±1 h)) above, within below a forest stand under sunny, conditions in thinned Sitka spruce (Picea sitchensis (Bong.) Carr.) (28 years old, with leaf area index approximately 5.2 m2 m−2). recorded vertical profiles penetration (from 350 to 1050 nm), we also explored horizontal...
Despite the threats faced by seabirds in both terrestrial and marine habitats, even basic knowledge of locations colonies, population sizes trends is lacking for many remote areas world. Recent studies have shown that guano Adélie penguins can be identified from Landsat Enhanced Thematic Mapper (ETM) imagery used to map colonies on coasts around continental Antarctica. Our study highlights a new technique based unique spectral signature discriminate seabird background geology vegetation...
Climate, nitrogen (N) and leaf area index (LAI) are key determinants of crop yield. N additions can enhance yield but must be managed efficiently to reduce pollution. Complex process models estimate status by simulating soil-crop interactions, such require extensive inputs that seldom available. Through model-data fusion (MDF), we combine climate LAI time-series with an intermediate-complexity model infer The DALEC-Crop was calibrated for wheat yields across field experiments covering...
Abstract. Commercial off-the-shelf (COTS) digital cameras on-board unmanned aerial vehicles (UAVs) have the potential to be used as multispectral imaging systems; however, their spectral sensitivity is usually unknown and needs either measured or estimated. This paper details a step by methodology for identifying of modified (to response near infra-red wavelengths) un-modified COTS cameras, showing results its application three different models camera. Six still which are being systems UAVs,...
[1] Depth-integrated production rates of OH radicals and NO2 molecules from snowpacks in Ny-Ålesund, Svalbard, are calculated fieldwork investigating the light penetration depth (e-folding depth) nadir reflectivity during unusually warm spring 2006. Light depths 8.1, 11.3, 5.1, 8.2 cm were measured for fresh, old, marine-influenced, glacial snowpacks, respectively (wavelength 400 nm). Radiative-transfer calculations with measurements produced scattering cross sections 5.3, 9.5, 20, 25.5 m2...
Proximal sensing is fundamental to monitor the spatial and seasonal dynamics of ecosystems can be considered as a crucial validation tool upscale in situ observations satellite level. Linking hyperspectral remote with carbon fluxes biophysical parameters critical allow exploitation temporal extensive information for validating model simulations at different scales. In this study, we present WhiteRef, new system designed direct result needs identified during EUROSPEC ES0903 Cost Action,...
Angeleena Thomas, Malcolm Rider, Andrew Curtis and Alasdair MacArthur propose a novel approach to lithology classification from core photographs based on object-based image analysis, an advanced method used in remote sensing medical imaging.
Peatlands play an important role in the global carbon cycle due to high storage substrate. Ecosystem production depends, for example, on solar energy amount that reaches vegetation, however diffuse component of this flux can substantially increase ecosystem net productivity. This phenomenon is observed different ecosystems, but study atmosphere optical properties peatland lacking. In paper, presented methodology allowed us disentangle radiation impact (NEP) Rzecin peatland, Poland. It assess...
Perseverance, Agnew‐Wiluna Belt, Western Australia, is the largest stratabound komatiitic dunite‐hosted Ni–Cu–(PGE) deposit on Earth. Perseverance often reported as containing demonstrable evidence for thermal erosion (e.g. truncation of footwall stratigraphy), an essential component in prevailing ore genesis models. a highly strained and strongly altered deposit. The strong alteration structural overprint have resulted metakomatiite unit with no primary volcanological or magmatic contacts...
Ground-based measurements of the hemispherical directional reflectance factor (HDRF) windblown snow covered Arctic tundra were measured at large solar zenith angles (79°-85°) for six sites near international research base in Ny-Ålesund, Svalbard. Measurements made with Gonio RAdiometric Spectrometer System over viewing 0°-50° and azimuth 0°-360°, wavelength range 400-1700 nm. The HDRF showed good consistency between near-nadir backward angles, a relative standard deviation less than 10%...
Solar induced chlorophyll fluorescence (SIF) emitted from plant canopies is now retrievable space. In addition, SIF also routinely measured fixed tower platforms. However there a scale gap between temporally continuous measurements and spatially coarse satellite retrievals that being bridged by drone technology. Drone of can be used to help unravel the structural species component dependencies occur across space on meters in heterogeneous vegetation types. Also when flown at sufficient...