George Xian (Former Employee)
Science and Products
Filter Total Items: 77
Foreword to the issue on remote sensing of regional land use and land cover Foreword to the issue on remote sensing of regional land use and land cover
This issue showcases some good work from Chinese authors who attended the International Workshop of Earth Observation and Remote Sensing Applications (EORSA), held in Beijing, China, June 30-July 2, 2008. The five articles in this issue focus on remote sensing of regional land use and land cover.
Authors
Qihao Weng, Jixian Zhang, P. Gamba, George Z. Xian
Monitoring urban land cover change by updating the national land cover database impervious surface products Monitoring urban land cover change by updating the national land cover database impervious surface products
The U.S. Geological Survey (USGS) National Land Cover Database (NLCD) 2001 is widely used as a baseline for national land cover and impervious conditions. To ensure timely and relevant data, it is important to update this base to a more recent time period. A prototype method was developed to update the land cover and impervious surface by individual Landsat path and row. This method...
Authors
George Z. Xian, Collin G. Homer
Updating the 2001 National Land Cover Database land cover classification to 2006 by using Landsat imagery change detection methods Updating the 2001 National Land Cover Database land cover classification to 2006 by using Landsat imagery change detection methods
The recent release of the U.S. Geological Survey (USGS) National Land Cover Database (NLCD) 2001, which represents the nation's land cover status based on a nominal date of 2001, is widely used as a baseline for national land cover conditions. To enable the updating of this land cover information in a consistent and continuous manner, a prototype method was developed to update land cover...
Authors
George Xian, Collin G. Homer, Joyce Fry
Satellite remotely-sensed land surface parameters and their climatic effects for three metropolitan regions Satellite remotely-sensed land surface parameters and their climatic effects for three metropolitan regions
By using both high-resolution orthoimagery and medium-resolution Landsat satellite imagery with other geospatial information, several land surface parameters including impervious surfaces and land surface temperatures for three geographically distinct urban areas in the United States – Seattle, Washington, Tampa Bay, Florida, and Las Vegas, Nevada, are obtained. Percent impervious...
Authors
George Xian
Quantifying multi-temporal urban development characteristics in Las Vegas from Landsat and ASTER data Quantifying multi-temporal urban development characteristics in Las Vegas from Landsat and ASTER data
Urban development has expanded rapidly in Las Vegas, Nevada of the United States, over the last fifty years. A major environmental change associated with this urbanization trend is the transformation of the landscape from natural cover types to increasingly anthropogenic impervious surface. This research utilizes remote sensing data from both the Landsat and Terra-Advanced Spaceborne...
Authors
G. Xian, M. Crane, C. McMahon
An analysis of urban development and its environmental impact on the Tampa Bay watershed An analysis of urban development and its environmental impact on the Tampa Bay watershed
Urbanization has transformed natural landscapes into anthropogenic impervious surfaces. Urban land use has become a major driving force for land cover and land use change in the Tampa Bay watershed of west-central Florida. This study investigates urban land use change and its impact on the watershed. The spatial and temporal changes, as well as the development density of urban land use...
Authors
G. Xian, M. Crane, J. Su
Analysis of impacts of urban land use and land cover on air quality in the Las Vegas region using remote sensing information and ground observations Analysis of impacts of urban land use and land cover on air quality in the Las Vegas region using remote sensing information and ground observations
Urban development in the Las Vegas Valley of Nevada (USA) has expanded rapidly over the past 50 years. The air quality in the valley has suffered owing to increases from anthropogenic emissions of carbon monoxide, ozone and criteria pollutants of particular matter. Air quality observations show that pollutant concentrations have apparent heterogeneous characteristics in the urban area...
Authors
G. Xian
Analysis of urban land use change in the Las Vegas metropolitan area using multi-temporal satellite imagery Analysis of urban land use change in the Las Vegas metropolitan area using multi-temporal satellite imagery
Urban development has expanded rapidly in Las Vegas, Nevada, over the last fifty years. To assess urban land use change in the area, a sub-pixel change detection approach has been used to map urban extent and its temporal changes by determining sub-pixel level impervious surface areas from Landsat satellite remote sensing data in conjunction with digital orthophotography. Sub-pixel...
Authors
George Z. Xian, Mike Crane, C. McMahon
The study of ozone variations in the Las Vegas metropolitan area using remote sensing information and ground observations The study of ozone variations in the Las Vegas metropolitan area using remote sensing information and ground observations
Urban development in the Las Vegas Valley, Nevada, has grown rapidly in the past fifty years. Associated with this growth has been a change in landscape from natural cover types to developed urban land mixed with planned vegetation canopy throughout in the metropolitan area. Air quality in the Las Vegas Valley has been affected by increases in anthropogenic emissions and concentrations...
Authors
G. Xian, M. Crane
An analysis of urban thermal characteristics and associated land cover in Tampa Bay and Las Vegas using Landsat satellite data An analysis of urban thermal characteristics and associated land cover in Tampa Bay and Las Vegas using Landsat satellite data
Remote sensing data from both Landsat 5 and Landsat 7 systems were utilized to assess urban area thermal characteristics in Tampa Bay watershed of west-central Florida, and the Las Vegas valley of southern Nevada. To quantitatively determine urban land use extents and development densities, sub-pixel impervious surface areas were mapped for both areas. The urban–rural boundaries and...
Authors
George Xian, Mike Crane
Science and Products
Filter Total Items: 77
Foreword to the issue on remote sensing of regional land use and land cover Foreword to the issue on remote sensing of regional land use and land cover
This issue showcases some good work from Chinese authors who attended the International Workshop of Earth Observation and Remote Sensing Applications (EORSA), held in Beijing, China, June 30-July 2, 2008. The five articles in this issue focus on remote sensing of regional land use and land cover.
Authors
Qihao Weng, Jixian Zhang, P. Gamba, George Z. Xian
Monitoring urban land cover change by updating the national land cover database impervious surface products Monitoring urban land cover change by updating the national land cover database impervious surface products
The U.S. Geological Survey (USGS) National Land Cover Database (NLCD) 2001 is widely used as a baseline for national land cover and impervious conditions. To ensure timely and relevant data, it is important to update this base to a more recent time period. A prototype method was developed to update the land cover and impervious surface by individual Landsat path and row. This method...
Authors
George Z. Xian, Collin G. Homer
Updating the 2001 National Land Cover Database land cover classification to 2006 by using Landsat imagery change detection methods Updating the 2001 National Land Cover Database land cover classification to 2006 by using Landsat imagery change detection methods
The recent release of the U.S. Geological Survey (USGS) National Land Cover Database (NLCD) 2001, which represents the nation's land cover status based on a nominal date of 2001, is widely used as a baseline for national land cover conditions. To enable the updating of this land cover information in a consistent and continuous manner, a prototype method was developed to update land cover...
Authors
George Xian, Collin G. Homer, Joyce Fry
Satellite remotely-sensed land surface parameters and their climatic effects for three metropolitan regions Satellite remotely-sensed land surface parameters and their climatic effects for three metropolitan regions
By using both high-resolution orthoimagery and medium-resolution Landsat satellite imagery with other geospatial information, several land surface parameters including impervious surfaces and land surface temperatures for three geographically distinct urban areas in the United States – Seattle, Washington, Tampa Bay, Florida, and Las Vegas, Nevada, are obtained. Percent impervious...
Authors
George Xian
Quantifying multi-temporal urban development characteristics in Las Vegas from Landsat and ASTER data Quantifying multi-temporal urban development characteristics in Las Vegas from Landsat and ASTER data
Urban development has expanded rapidly in Las Vegas, Nevada of the United States, over the last fifty years. A major environmental change associated with this urbanization trend is the transformation of the landscape from natural cover types to increasingly anthropogenic impervious surface. This research utilizes remote sensing data from both the Landsat and Terra-Advanced Spaceborne...
Authors
G. Xian, M. Crane, C. McMahon
An analysis of urban development and its environmental impact on the Tampa Bay watershed An analysis of urban development and its environmental impact on the Tampa Bay watershed
Urbanization has transformed natural landscapes into anthropogenic impervious surfaces. Urban land use has become a major driving force for land cover and land use change in the Tampa Bay watershed of west-central Florida. This study investigates urban land use change and its impact on the watershed. The spatial and temporal changes, as well as the development density of urban land use...
Authors
G. Xian, M. Crane, J. Su
Analysis of impacts of urban land use and land cover on air quality in the Las Vegas region using remote sensing information and ground observations Analysis of impacts of urban land use and land cover on air quality in the Las Vegas region using remote sensing information and ground observations
Urban development in the Las Vegas Valley of Nevada (USA) has expanded rapidly over the past 50 years. The air quality in the valley has suffered owing to increases from anthropogenic emissions of carbon monoxide, ozone and criteria pollutants of particular matter. Air quality observations show that pollutant concentrations have apparent heterogeneous characteristics in the urban area...
Authors
G. Xian
Analysis of urban land use change in the Las Vegas metropolitan area using multi-temporal satellite imagery Analysis of urban land use change in the Las Vegas metropolitan area using multi-temporal satellite imagery
Urban development has expanded rapidly in Las Vegas, Nevada, over the last fifty years. To assess urban land use change in the area, a sub-pixel change detection approach has been used to map urban extent and its temporal changes by determining sub-pixel level impervious surface areas from Landsat satellite remote sensing data in conjunction with digital orthophotography. Sub-pixel...
Authors
George Z. Xian, Mike Crane, C. McMahon
The study of ozone variations in the Las Vegas metropolitan area using remote sensing information and ground observations The study of ozone variations in the Las Vegas metropolitan area using remote sensing information and ground observations
Urban development in the Las Vegas Valley, Nevada, has grown rapidly in the past fifty years. Associated with this growth has been a change in landscape from natural cover types to developed urban land mixed with planned vegetation canopy throughout in the metropolitan area. Air quality in the Las Vegas Valley has been affected by increases in anthropogenic emissions and concentrations...
Authors
G. Xian, M. Crane
An analysis of urban thermal characteristics and associated land cover in Tampa Bay and Las Vegas using Landsat satellite data An analysis of urban thermal characteristics and associated land cover in Tampa Bay and Las Vegas using Landsat satellite data
Remote sensing data from both Landsat 5 and Landsat 7 systems were utilized to assess urban area thermal characteristics in Tampa Bay watershed of west-central Florida, and the Las Vegas valley of southern Nevada. To quantitatively determine urban land use extents and development densities, sub-pixel impervious surface areas were mapped for both areas. The urban–rural boundaries and...
Authors
George Xian, Mike Crane