Donald Ohlen - Academia.edu (original) (raw)

Papers by Donald Ohlen

Research paper thumbnail of Mapping existing vegetation composition and structure

Research paper thumbnail of Use of multiple spectral indices to estimate burn severity in the Black Hills of South Dakota

The Jasper Fire occurred in the Black Hills National Forest, South Dakota, during August and Sept... more The Jasper Fire occurred in the Black Hills National Forest, South Dakota, during August and September of 2000. The fire disturbance to ecosystem characteristics was widespread and long-term. The goal of this study is to examine the correlations between spectral indices and field-observed burn severity, and to provide a practical method to estimate burn severity using remote sensing data. We used three Landsat images acquired in June 2000, June 2001, and May 2002. The Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Normalized Burn Ratio (NBR), and Integrated Forest Index (IFI) were calculated from Landsat at-sensor-reflectance data. Differences of these spectral indices in first and second pre/post-burn years were calculated and analyzed with 71 field-based Composite Burn Index (CBI) data collected in May 2002. The results showed that NDVI and EVI differences correlated well with field CBI data in the first post-burn year with R 2 values of 0.69s for ...

Research paper thumbnail of Perspectives on LANDFIRE Prototype Project Accuracy Assessment

Research paper thumbnail of Progress in the Development of a Global Land Cover Characteristics Data Base

Research paper thumbnail of Experimental AVHRR land data sets for environmental monitoring and modeling

Research paper thumbnail of The global land-cover characteristics database: the users' perspective

Research paper thumbnail of Development of a global land cover characteristics database and IGBP DISCover from 1 km AVHRR data

… Journal of Remote …, 2000

Research paper thumbnail of Seasonal Land-Cover Regions of the United States

Annals of the Association of American Geographers, 1995

Research paper thumbnail of Global land cover products derived from satellite data-Improvements in the global biospheric record from the Advanced Very High Resolution Radiometer (AVHRR)

Research paper thumbnail of Estimating aboveground forest biomass carbon and fire consumption in the U.S. Utah High Plateaus using data from the Forest Inventory and Analysis Program, Landsat, and LANDFIRE

Research paper thumbnail of An analysis of the IGBP global land-cover characterization process

… and Remote Sensing, 1999

The International Geosphere Biosphere Programme (IGBP) has called for the developmen t of improve... more The International Geosphere Biosphere Programme (IGBP) has called for the developmen t of improved global land-cover data for use in increasingly sophisticated global environmental models. To meet this need, the staff of the US Geological Survey and the University of ...

Research paper thumbnail of Mapping existing vegetation composition and structure

Research paper thumbnail of Use of multiple spectral indices to estimate burn severity in the Black Hills of South Dakota

The Jasper Fire occurred in the Black Hills National Forest, South Dakota, during August and Sept... more The Jasper Fire occurred in the Black Hills National Forest, South Dakota, during August and September of 2000. The fire disturbance to ecosystem characteristics was widespread and long-term. The goal of this study is to examine the correlations between spectral indices and field-observed burn severity, and to provide a practical method to estimate burn severity using remote sensing data. We used three Landsat images acquired in June 2000, June 2001, and May 2002. The Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Normalized Burn Ratio (NBR), and Integrated Forest Index (IFI) were calculated from Landsat at-sensor-reflectance data. Differences of these spectral indices in first and second pre/post-burn years were calculated and analyzed with 71 field-based Composite Burn Index (CBI) data collected in May 2002. The results showed that NDVI and EVI differences correlated well with field CBI data in the first post-burn year with R 2 values of 0.69s for ...

Research paper thumbnail of Perspectives on LANDFIRE Prototype Project Accuracy Assessment

Research paper thumbnail of Progress in the Development of a Global Land Cover Characteristics Data Base

Research paper thumbnail of Experimental AVHRR land data sets for environmental monitoring and modeling

Research paper thumbnail of The global land-cover characteristics database: the users' perspective

Research paper thumbnail of Development of a global land cover characteristics database and IGBP DISCover from 1 km AVHRR data

… Journal of Remote …, 2000

Research paper thumbnail of Seasonal Land-Cover Regions of the United States

Annals of the Association of American Geographers, 1995

Research paper thumbnail of Global land cover products derived from satellite data-Improvements in the global biospheric record from the Advanced Very High Resolution Radiometer (AVHRR)

Research paper thumbnail of Estimating aboveground forest biomass carbon and fire consumption in the U.S. Utah High Plateaus using data from the Forest Inventory and Analysis Program, Landsat, and LANDFIRE

Research paper thumbnail of An analysis of the IGBP global land-cover characterization process

… and Remote Sensing, 1999

The International Geosphere Biosphere Programme (IGBP) has called for the developmen t of improve... more The International Geosphere Biosphere Programme (IGBP) has called for the developmen t of improved global land-cover data for use in increasingly sophisticated global environmental models. To meet this need, the staff of the US Geological Survey and the University of ...