Jay Gao
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View article: Estimating Grazing Pressure from Satellite Time Series Without Reliance on Total Production
Estimating Grazing Pressure from Satellite Time Series Without Reliance on Total Production Open
Accurately assessing grazing impacts is essential for sustaining alpine grasslands. Conventional approaches often rely on total forage productivity, an indirect and uncertain proxy for forage availability. In this study, we propose a novel…
View article: Path Loss Prediction Model of 5G Signal Based on Fusing Data and XGBoost—SHAP Method
Path Loss Prediction Model of 5G Signal Based on Fusing Data and XGBoost—SHAP Method Open
The accurate prediction of path loss is essential for planning and optimizing communication networks, as it directly impacts the user experience. In 5G signal propagation, the mix of varied terrain and dense high-rise buildings poses signi…
View article: Wetland-to-Meadow Transition Alters Soil Microbial Networks and Stability in the Sanjiangyuan Region
Wetland-to-Meadow Transition Alters Soil Microbial Networks and Stability in the Sanjiangyuan Region Open
Wetlands and meadows are two terrestrial ecosystems that are strikingly distinct in terms of hydrological conditions and biogeochemical characteristics. Wetlands generally feature saturated soils, high accumulation of organic matter, and h…
View article: Late Holocene Wetland Environmental Changes and Their Climatic Drivers in the Marginal Regions of the Tibetan Plateau
Late Holocene Wetland Environmental Changes and Their Climatic Drivers in the Marginal Regions of the Tibetan Plateau Open
This study investigates the dynamics and driving mechanisms of wetland environment changes in the northeastern Tibetan Plateau, focusing on the expansion and contraction of wetlands in Maqin County, on the northeastern edge of the Tibetan …
View article: Towards compliance with the 2021 WHO air quality guidelines: A comparative analysis of PM2.5 trends in australia and china
Towards compliance with the 2021 WHO air quality guidelines: A comparative analysis of PM2.5 trends in australia and china Open
In 2021, the World Health Organization (WHO) released new Air Quality Guidelines (AQG) which significantly reduced the recommended annual mean concentration of fine particulate matter (PM2.5) in ambient air from 10 μg/m3 (AQG 2005) to 5 μg…
View article: An Improved Approach to Estimate Stocking Rate and Carrying Capacity Based on Remotely Sensed Phenology Timings
An Improved Approach to Estimate Stocking Rate and Carrying Capacity Based on Remotely Sensed Phenology Timings Open
Accurate estimation of livestock carrying capacity (LCC) and implementation of an appropriate actual stocking rate (ASR) are key to the sustainable management of grazing adapted alpine grassland ecosystems. The reliable determination of ab…
View article: An Improved Approach to Estimate Stocking Rate and Carrying Capacity Based on Remotely Sensed Phenology Timings
An Improved Approach to Estimate Stocking Rate and Carrying Capacity Based on Remotely Sensed Phenology Timings Open
Accurate estimation of livestock carrying capacity (LCC) and implementing an appropriate actual stocking rate (ASR) is key to sustainable management of grazing adapted alpine grassland ecosystems. Reliable determination of aboveground biom…
View article: Responses of Soil and Vegetation Properties to Chemical Fertilization in Restoring Coal Gangue Hills in an Alpine Mining Area
Responses of Soil and Vegetation Properties to Chemical Fertilization in Restoring Coal Gangue Hills in an Alpine Mining Area Open
During the coal mining operation, the accumulated soil in coal gangue hills often suffers from nutrient deficiencies, which can be overcome using fertilizer supplementation. The supplementation of exogenous nutrients has proven to be an ef…
View article: A comprehensive review of the development of land use regression approaches for modeling spatiotemporal variations of ambient air pollution: A perspective from 2011 to 2023
A comprehensive review of the development of land use regression approaches for modeling spatiotemporal variations of ambient air pollution: A perspective from 2011 to 2023 Open
Land use regression (LUR) models are widely used in epidemiological and environmental studies to estimate humans' exposure to air pollution within urban areas. However, the early models, developed using linear regressions and data from fix…
View article: Responses of Soil and Vegetation Properties to Chemical Fertilization in Restoring Coal Gangue Hills in an Alpine Mining Area
Responses of Soil and Vegetation Properties to Chemical Fertilization in Restoring Coal Gangue Hills in an Alpine Mining Area Open
During the coal mining operation, the accumulated soil in coal gangue hills often suffers from nutrient deficiencies, which can be overcome using fertilizer supplementation. The supplementation of exogenous nutrients has proven to be an ef…
View article: Enhancing Landsat image based aboveground biomass estimation of black locust with scale bias-corrected LiDAR AGB map and stratified sampling
Enhancing Landsat image based aboveground biomass estimation of black locust with scale bias-corrected LiDAR AGB map and stratified sampling Open
There is a growing interest in leveraging LiDAR-generated forest Aboveground Biomass (LG-AGB) data as a reference to retrieve AGB from satellite observations. However, the biases arising from the upscaling process and the impact of the sam…
View article: Improving the accuracy of models to map alpine grassland above‐ground biomass using Google earth engine
Improving the accuracy of models to map alpine grassland above‐ground biomass using Google earth engine Open
Accurate modelling and mapping of alpine grassland aboveground biomass (AGB) are crucial for pastoral agriculture planning and management on the Qinghai Tibet Plateau (QTP). This study assessed the effectiveness of four popular models (tra…
View article: Multi-scale spatiotemporal wetland loss and its critical influencing factors in China determined using innovative grid-based GWR
Multi-scale spatiotemporal wetland loss and its critical influencing factors in China determined using innovative grid-based GWR Open
Wetlands serve as a critical habitat for many plants and animals. However, with urban expansion and other processes, the wetlands in China are lost at an alarming rate in recent decades. This study quantifies the pace of wetland loss in th…
View article: Prediction of Multi-Scale Socioeconomic Parameters from Long-Term Nighttime Lights Satellite Data Using Decision Tree Regression: A Case Study of Chongqing, China
Prediction of Multi-Scale Socioeconomic Parameters from Long-Term Nighttime Lights Satellite Data Using Decision Tree Regression: A Case Study of Chongqing, China Open
The Defense Meteorological Satellite Program Operational Linescan System (DMSP/OLS) and the Suomi National Polar-Orbiting Partnership satellite’s Visible Infrared Imaging Radiometer Suite (NPP/VIIRS) nighttime light (NTL) data provide an a…
View article: A Topographic Perspective on the Propensity for Degradation of Plateau Swampy Meadows in Maduo County, West China
A Topographic Perspective on the Propensity for Degradation of Plateau Swampy Meadows in Maduo County, West China Open
The swampy meadows atop the vast Qinghai–Tibet Plateau in West China fall into alpine, pediment, valley, floodplain, terrace, lacustrine, and riverine types according to their hydro-geomorphic properties. They have suffered degradation to …
View article: Health assessment of plantations based on LiDAR canopy spatial structure parameters
Health assessment of plantations based on LiDAR canopy spatial structure parameters Open
The Yellow River Delta (YRD) has China's largest artificial Robinia pseudoacacia forest, which was planted in the late 1970s and suffered extensive dieback in the 1990s. The health grade of the R.pseudoacacia forest (named canopy vigor gra…
View article: Effects of disturbances on aboveground biomass of alpine meadow in the Yellow River Source Zone, Western China
Effects of disturbances on aboveground biomass of alpine meadow in the Yellow River Source Zone, Western China Open
A field experiment quantifies the impacts of two external disturbances (mowing‐simulated grazing and number of pika) on aboveground biomass (AGB) in the Yellow River Source Zone from 2018 to 2020. AGB was estimated from drone images for 27…
View article: Phenology-based delineation of irrigated and rain-fed paddy fields with Sentinel-2 imagery in Google Earth Engine
Phenology-based delineation of irrigated and rain-fed paddy fields with Sentinel-2 imagery in Google Earth Engine Open
Paddy rice agriculture is practiced in both rain-fed and irrigated ecosystems in the Philippines. However, small farms are prevalent in the region, and current satellite-based mapping techniques do not distinguish between the two ecosystem…
View article: Remote sensing-based estimation of rice yields using various models: A critical review
Remote sensing-based estimation of rice yields using various models: A critical review Open
Reliable estimation of region-wide rice yield is vital for food security and agricultural management. Field-scale models have increased our understanding of rice yield and its estimation under theoretical environmental conditions. However,…
View article: Controlled urban sprawl in Auckland, New Zealand and its impacts on the natural environment and housing affordability
Controlled urban sprawl in Auckland, New Zealand and its impacts on the natural environment and housing affordability Open
Auckland experienced phenomenal expansion since 1841. This study assesses the pace of urban sprawl and its control over the natural environment and housing affordability. After the urban built-up area was mapped, its change over time was d…
View article: Effects of the hummock–depression microhabitat on plant communities of alpine marshy meadows in the Yellow River Source Zone, China
Effects of the hummock–depression microhabitat on plant communities of alpine marshy meadows in the Yellow River Source Zone, China Open
Our objectives are to examine the effects of hummock–depression spatial heterogeneity on plant communities and soil properties, and to understand the process of maintaining and adjusting microtopography-mediated hydrological inputs and the…
View article: Improved Estimation of Aboveground Biomass of Disturbed Grassland through Including Bare Ground and Grazing Intensity
Improved Estimation of Aboveground Biomass of Disturbed Grassland through Including Bare Ground and Grazing Intensity Open
Accurate approaches to aboveground biomass (AGB) estimation are required to support appraisal of the effectiveness of land use measures, which seek to protect grazing-adapted grasslands atop the Qinghai-Tibet Plateau (QTP). This methodolog…
View article: The evolution of hummock–depression micro‐topography in an alpine marshy wetland in Sanjiangyuan as inferred from vegetation and soil characteristics
The evolution of hummock–depression micro‐topography in an alpine marshy wetland in Sanjiangyuan as inferred from vegetation and soil characteristics Open
The hummock–depression micro‐topography characteristics of the alpine marshy wetland in Sanjiangyuan are indicative of wetland degradation and the process by which healthy wetlands are transformed into flat grasslands. The aim of the prese…
View article: NeBula: Quest for Robotic Autonomy in Challenging Environments; TEAM\n CoSTAR at the DARPA Subterranean Challenge
NeBula: Quest for Robotic Autonomy in Challenging Environments; TEAM\n CoSTAR at the DARPA Subterranean Challenge Open
This paper presents and discusses algorithms, hardware, and software\narchitecture developed by the TEAM CoSTAR (Collaborative SubTerranean\nAutonomous Robots), competing in the DARPA Subterranean Challenge.\nSpecifically, it presents the …
View article: Urban expansion in Auckland, New Zealand: a GIS simulation via an intelligent self-adapting multiscale agent-based model
Urban expansion in Auckland, New Zealand: a GIS simulation via an intelligent self-adapting multiscale agent-based model Open
When modelling urban expansion dynamics, cellular automata models focus mostly on the physical environments and cell neighbours, but ignore the ‘human’ aspect of the allocation of urban expansion cells. This limitation is overcome here usi…
View article: MODELLING OF POPULATION EXPOSURE TO LANDSLIDE RISK IN SUKABUMI, INDONESIA USING GIS
MODELLING OF POPULATION EXPOSURE TO LANDSLIDE RISK IN SUKABUMI, INDONESIA USING GIS Open
Modelling population exposure to landslide risk is essential for mitigating the damage of landslides. This research aims to assess population exposure to the modelled landslide risk in the Sukabumi region, Indonesia. Also assessed in this …
View article: Coupling Machine Learning and Cellular Automata-Markov Chain to Model Urban Expansion in a Fast Developing Area: A Case Study of Liangjiang New District of Chongqing, China. GeoComputation 2019
Coupling Machine Learning and Cellular Automata-Markov Chain to Model Urban Expansion in a Fast Developing Area: A Case Study of Liangjiang New District of Chongqing, China. GeoComputation 2019 Open
Timely monitoring and modeling of landuse change is vital to manage land resources effectively and to rectify defective land use policies, especially in rapidly urbanizing areas. Our research is applied to an annual land use dataset in ord…