A5087645671- Land Use and Ecosystem Services
- Impact of Light on Environment and Health
- Geographic Information Systems Studies
- Urban Transport and Accessibility
- Remote Sensing in Agriculture
- Urban Design and Spatial Analysis
- Remote Sensing and LiDAR Applications
- Remote-Sensing Image Classification
- Urban, Neighborhood, and Segregation Studies
- Advanced Image and Video Retrieval Techniques
- Data Management and Algorithms
- 3D Surveying and Cultural Heritage
- Automated Road and Building Extraction
- Spatial and Panel Data Analysis
- demographic modeling and climate adaptation
- Fire effects on ecosystems
- Human Mobility and Location-Based Analysis
- Data-Driven Disease Surveillance
- Migration, Aging, and Tourism Studies
- 3D Modeling in Geospatial Applications
- Flood Risk Assessment and Management
- Disaster Management and Resilience
- Rural development and sustainability
- Veterinary Oncology Research
- Advanced Numerical Analysis Techniques
University of Colorado Boulder
2015-2024
University of Colorado System
2017-2024
Cooperative Institute for Research in Environmental Sciences
2021-2023
Earth Island Institute
2022
Columbia University
2022
University of Zurich
2006-2015
Collegium Helveticum
2015
Fogarty International Center
2011-2012
National Institutes of Health
2011-2012
Colorado State University
2009
Consistent with a warming climate, birds are shifting the timing of their migrations, but it remains unclear to what extent these shifts have kept pace changing environment. Because bird migration is primarily cued by annually consistent physiological responses photoperiod, conditions at breeding grounds depend on variable arrival and climate-driven spring events would diverge. We combined satellite citizen science data estimate rates change in phenological interval between green-up...
Over the past 200 years, population of United States grew more than 40-fold. The resulting development built environment has had a profound impact on regional economic, demographic, and environmental structure North America. Unfortunately, constraints data availability limit opportunities to study long-term patterns how growth relates land-use change. Using hundreds millions property records, we undertake finest-resolution analysis date, in space time, urbanization from 1810 2015. Temporally...
Urban tree cover provides benefits to human health and well-being, but previous studies suggest that is often inequitably distributed. Here, we use National Agriculture Imagery Program digital ortho photographs survey the inequality for Census blocks in US large urbanized areas, home 167 million people across 5,723 municipalities other Census-designated places. We compared summer land surface temperature, as measured using Landsat imagery. In 92% of areas surveyed, low-income have less than...
Losses from natural hazards are escalating dramatically, with more properties and critical infrastructure affected each year. Although the magnitude, intensity, and/or frequency of certain has increased, development contributes to this unsustainable trend, as disasters emerge when disturbances meet vulnerable assets populations. To diagnose patterns leading increased exposure in conterminous United States (CONUS), we identified earthquake, flood, hurricane, tornado, wildfire hazard hotspots,...
Abstract Human settlement plays a key role in understanding social processes such as urbanization and interactions between human environmental systems but not much is known about the landscape evolution before era of operational remote sensing technology. In this study, housing property databases are used to create new gridded layers describing at fine spatial temporal resolution conterminous United States 1810 2015. The main products raster composite layer representing year first...
With climate-driven increases in wildfires the western U.S., it is imperative to understand how risk homes also changing nationwide. Here, we quantify number of threatened, suppression costs, and ignition sources for 1.6 million United States (U.S.; 1992–2015). Human-caused accounted 97% residential threatened (within 1 km a wildfire) nearly third costs. This study illustrates wildland-urban interface (WUI), which accounts only small portion U.S. land area (10%), acts as major source fires,...
The Global Human Settlement Layer (GHSL) project fosters an enhanced, public understanding of the human presence on Earth. A decade after its inception in Digital Earth 2020 vision, GHSL is established European Commission's Joint Research Centre and integral part Copernicus Emergency Management Service. 2023 edition, a result rigorous research Observation data population censuses, contributes significantly to worldwide settlements. It introduces new elements like 10-m-resolution, sub-pixel...
The scaling relations between city attributes and population are emergent ubiquitous aspects of urban growth. Quantifying these understanding their theoretical foundation, however, is difficult due to the challenge defining boundaries a lack historical data study dynamics over time space. To address this issue, we analyze infrastructure across 857 metropolitan areas in conterminous United States an unprecedented 115 years (1900–2015) using dasymetrically refined estimates, road network...
Dasymetric models increase the spatial resolution of population data by incorporating related ancillary layers. The role uncertainty in dasymetric modeling has not been fully addressed as yet. Uncertainty is usually present because most are themselves uncertain, and/or geographic processes that connect and layers precisely known. A new methodology - Penalized Maximum Entropy Model (P-MEDM) presented enables these sources to be represented modeled. P-MEDM propagates through model yields...
Most of future population growth will take place in the world's cities and towns. Yet, there is no well-established, consistent way to measure either urban land or people. Even census-based concepts measures undergo frequent revision, impeding rigorous comparisons over time place. This study presents a new spatial approach derive proxies for US. It compares census-designated blocks with land-based classifications built-up areas derived from time-series Global Human Settlement Layer (GHSL)...
Transportation infrastructure, such as road or railroad networks, represent a fundamental component of our civilization. For sustainable planning and informed decision making, thorough understanding the long-term evolution transportation infrastructure networks is crucial. However, spatially explicit, multi-temporal network data covering large spatial extents are scarce rarely available prior to 2000s. Herein, we propose framework that employs increasingly scanned georeferenced historical...
The most destructive and deadly wildfires in US history were also fast. Using satellite data, we analyzed the daily growth rates of more than 60,000 fires from 2001 to 2020 across contiguous US. Nearly half ecoregions experienced fast that grew 1620 hectares 1 day. These accounted for 78% structures destroyed 61% suppression costs ($18.9 billion). From 2020, average peak rate these doubled (+249% relative 2001) Western 3 million within 4 kilometers a fire during this period Given recent...
Abstract Uncertainty research represents a stream of high interest within the community geographical information science. Its elements, terminology and typology are still under strong discussion adopted methods for analysis currently intensive development. This paper presents conceptual framework systematic investigation uncertainty which occurs in applications land cover change modelling Geographical Information Systems (GIS) based on historical map data. Historical, this context, means is...
ABSTRACT Rural households across the globe engage in both migration and natural resource use as components of livelihood strategies designed to meet household needs. Yet, scholars have only recently begun regularly integrate environmental factors into empirical modelling efforts. To examine migration‐environment association rural South Africa, we vegetation measures derived from satellite imagery combined with detailed demographic data over 9000 at Agincourt Health Demographic Surveillance...
How entrenched is the spatial structure of inequality in cities? Although recent discussions provide conflicting answers to this question, absence long-term, longitudinal neighborhood data c...
Information extraction from historical maps represents a persistent challenge due to inferior graphical quality and the large data volume of digital map archives, which can hold thousands digitized sheets. Traditional processing techniques typically rely on manually collected templates symbol interest, thus are not suitable for large-scale information extraction. In order digitally preserve such amounts valuable retrospective geographic information, high levels automation required. Herein,...
The collection, processing, and analysis of remote sensing data since the early 1970s has rapidly improved our understanding change on Earth's surface. While satellite-based Earth observation proven to be vast scientific value, these are typically confined recent decades often lack important thematic detail. Here, we advance in this arena by constructing new spatially explicit settlement for United States that extend back 19th century consistently enumerated at fine spatial temporal...
Abstract Increasing fire impacts across North America are associated with climate and vegetation change, greater exposure through development expansion, less-well studied but salient social vulnerabilities. We at a critical moment in the contemporary human-fire relationship, an urgent need to transition from emergency response proactive measures that build sustainable communities, protect human health, restore use of necessary for maintaining ecosystem processes. propose integrated risk...
Abstract Background Access to healthcare is imperative health equity and well-being. Geographic access can be modeled using spatial datasets on local context, together with the distribution of existing facilities populations. Several population are currently available, but their impact accessibility analyses unknown. In this study, we model geographic public at 100-meter resolution in sub-Saharan Africa evaluate six most popular gridded for coverage statistics different administrative...