A5066320594- Remote Sensing in Agriculture
- Remote Sensing and LiDAR Applications
- Fire effects on ecosystems
- Species Distribution and Climate Change
- Ecology and Vegetation Dynamics Studies
- Land Use and Ecosystem Services
- African Botany and Ecology Studies
- Forest Insect Ecology and Management
- Forest Ecology and Biodiversity Studies
- Agriculture and Rural Development Research
- Atmospheric and Environmental Gas Dynamics
- Insect and Arachnid Ecology and Behavior
- Calibration and Measurement Techniques
- Plant and animal studies
- Conservation, Biodiversity, and Resource Management
- Rangeland and Wildlife Management
- Forest ecology and management
- Advanced Image and Video Retrieval Techniques
- Insects and Parasite Interactions
- Atmospheric Ozone and Climate
- Machine Learning and Algorithms
- Dermatological diseases and infestations
- Insect and Pesticide Research
- Infrared Target Detection Methodologies
- Horticultural and Viticultural Research
Harvard University
2020-2024
Leidos (United States)
2024
Harvard University Press
2022-2023
University of Massachusetts Boston
2018-2021
Evolutionary Genomics (United States)
2021
Boston University
2017
NASA's Global Ecosystem Dynamics Investigation (GEDI) is collecting spaceborne full waveform lidar data with a primary science goal of producing accurate estimates forest aboveground biomass density (AGBD). This paper presents the development models used to create GEDI's footprint-level (~25 m) AGBD (GEDI04_A) product, including description datasets and procedure for final model selection. The fit our are from compilation globally distributed spatially temporally coincident field airborne...
Abstract The consistent monitoring of trees both inside and outside forests is key to sustainable land management. Current systems either ignore or are too expensive be applied consistently across countries on a repeated basis. Here we use the PlanetScope nanosatellite constellation, which delivers global very high-resolution daily imagery, map forest non-forest tree cover for continental Africa using images from single year. Our prototype 2019 (RMSE = 9.57%, bias −6.9%). demonstrates that...
This paper provides a review and summary status of the research underway by NASA Terra Aqua Suomi-NPP Land Discipline Team to provide continuity global land data products from Moderate resolution Imaging Spectroradiometer (MODIS) Visible Infrared Radiometer Suite (VIIRS). The two MODIS instruments on Earth Observing System (morning overpass) (afternoon platforms have provided more than twenty years data. peer-reviewed generated are now being transitioned production using VIIRS inputs, with...
Abstract The flexibility of UAV‐lidar remote sensing offers a myriad new opportunities for savanna ecology, enabling researchers to measure vegetation structure at variety temporal and spatial scales. However, this also increases the number customizable variables, such as flight altitude, pattern, sensor parameters, that, when adjusted, can impact data quality well applicability dataset specific research interest. To better understand impacts that UAV patterns parameters have on metrics, we...
Satellite-based retrievals of land surface albedo at 20-m resolution are generated by coupling the reflectances from recently launched Sentinel-2A satellite with anisotropy information (as described Bidirectional Reflectance Distribution Function, BRDF) either MODerate-resolution Imaging Spectroradiometer (MODIS) or Visible Infrared Radiometer Suite (VIIRS). The intrinsic black-sky (BSA) and white-sky (WSA) values derived six shortwave spectral bands Sentinel-2A's Multi Spectral Instrument...
The hemlock woolly adelgid (HWA; Adelges tsugae) is an invasive insect infestation that spreading into the forests of northeastern United States, driven by warmer winter temperatures associated with climate change. initial stages this disturbance are difficult to detect passive optical remote sensing, since often causes its host species, eastern trees (Tsuga canadensis), defoliate in midstory and understory before showing impacts overstory. New active sensing technologies—such as recently...
Abstract The consistent monitoring of trees both inside and outside forests is key to mitigating climate change. Current systems either ignore or are too expensive be applied consistently across countries on a repeated basis. Here we make use the PlanetScope nanosatellite constellation, which delivers global very high-resolution daily imagery, map forest non-forest tree cover for continental Africa using images from single year. Our prototype 2019 demonstrates that precise assessment all...
Abstract Fire plays an integral role in shaping the vegetation structure of savanna ecosystems. However, effects fire regime characteristics, such as frequency and season burn, on structure, biomass tree abundance across landscape types are largely unknown. We used high‐resolution airborne light detection ranging (LiDAR) to investigate long‐term manipulation Kruger National Park, South Africa. analysed exclusion experimental burns every 1, 2, 3, 4 6 years during different seasons aboveground...
Abstract Ecologists, foresters and conservation practitioners need ‘biodiversity scanners’ to effectively inventory biodiversity, audit progress track changes in ecosystem function. Quantifying biological diversity using remote sensing methods remains challenging, especially for small invertebrates. However, insect aggregations can drastically alter landscapes vegetation, these ‘extended phenotypes’ could serve as environmental landmarks of presence remotely sensed data. To test the...
Abstract Background and Aims Terrestrial laser scanners (TLSs) have successfully captured various properties of individual trees potential to further increase the quality efficiency forest surveys. However, TLSs are limited line sight observations, forests complex structural environments that can occlude TLS beams thereby cause incomplete samples. We evaluate prevalence sources occlusion limit stems for scans, assess impacts sample incompleteness, sampling strategies data analysis techniques...
In this study, we introduce metaproperty analysis of terrestrial laser scanner (TLS) data, and demonstrate its application through several ecological classification problems. Metaproperty considers pulse level spatial metrics derived from the hundreds thousands to millions lidar pulses present in a single scan typical contemporary instrument. such large aggregations, properties populations data reflect attributes underlying conditions ecosystems.In provide Classification Model employ TLS for...
Invasive species are increasingly present in our ecosystems and pose a threat to the health of forest ecosystems. Practitioners tasked with locating these invasive finding ways mitigate their spread impacts, often through costly field surveys. Meanwhile, researchers developing remote sensing products detect changes vegetation structure that caused by species, which could aid early detection monitoring efforts. Although both groups working towards similar goals data essential for validating...
Fire regimes are expected to change with climate change, resulting in a crucial need understand the specific ways which variable fire impact important contributors ecosystem functioning, such as mound-building termites. Termite mounds and both agents of savanna heterogeneity but there is little understanding how they interact across types. We used very high-resolution LiDAR remote sensing measure size distribution termite approximately 1300 ha experimental burn plots four South African...
Abstract Large mammalian herbivores exert strong top‐down control on plants, which in turn influence most ecological processes. Accordingly, the decline, displacement, or extinction of wild large African savannas is expected to alter physical structure vegetation, diversity plant communities, and downstream ecosystem functions. However, herbivore impacts vegetation comprise both direct indirect effects often depend body size type. Understanding how affect savanna requires disaggregating...
Abstract The consistent monitoring of trees both inside and outside forests is key to mitigating climate change. Current systems either ignore or are too expensive be applied consistently across countries on a repeated basis. Here we make use the PlanetScope nanosatellite constellation, which delivers global very high-resolution daily imagery, map forest non-forest tree cover for continental Africa using images from single year. Our prototype 2019 demonstrates that precise assessment all...
The use of digital elevation models has proven to be crucial in numerous studies related savanna ecosystem research. However, the insufficient spatial resolution chosen input data is often considered a limiting factor when conducting local regional scale analysis. and orthorectified imagery created this study represent first wall-to-wall sets produced for Kruger National Park (KNP), South Africa, at very high resolution. Using colour-infrared (CIR) aerial from archives Chief Directorate:...
Vegetation structural complexity and the diversity of animal communities are closely linked in vegetated ecosystems. These structure-diversity relationships have potential to be used predict biodiversity at large spatial scales using remote sensing data. However, may not generalizable across different ecosystems or even ecotypes within a single ecosystem. To understand how vary tree-grass mosaic savanna environment, we evaluated bird relates vegetation structure multiple environmental...
Much of Earth's charismatic megafauna is endangered by human activities, particularly the rhino, which at risk extinction due to poaching crisis in Africa. Monitoring rhinos' movement crucial their protection but has unfortunately proven difficult because rhinos are elusive. Therefore, instead tracking rhinos, we propose novel approach mapping communal defecation sites, called middens, give information about spatial behavior valuable anti-poaching, management, and reintroduction efforts....