Publications
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Absolute radiometric calibration of Landsat using a pseudo invariant calibration site
Pseudo invariant calibration sites (PICS) have been used for on-orbit radiometric trending of optical satellite systems for more than 15 years. This approach to vicarious calibration has demonstrated a high degree of reliability and repeatability at the level of 1-3% depending on the site, spectral channel, and imaging geometries. A variety of sensors have used this approach for trending because i
Authors
D. Helder, K. J. Thome, N. Mishra, G. Chander, Xiaoxiong Xiong, A. Angal, Tae-young Choi
EO-1 Hyperion reflectance time series at calibration and validation sites: stability and sensitivity to seasonal dynamics
This study evaluated Earth Observing 1 (EO-1) Hyperion reflectance time series at established calibration sites to assess the instrument stability and suitability for monitoring vegetation functional parameters. Our analysis using three pseudo-invariant calibration sites in North America indicated that the reflectance time series are devoid of apparent spectral trends and their stability consisten
Authors
P.K.E. Campbell, E.M. Middleton, K. J. Thome, Raymond F. Kokaly, K.F. Huemmrich, K.A. Novick, N.A. Brunsell
Cross-sensor comparisons between Landsat 5 TM and IRS-P6 AWiFS and disturbance detection using integrated Landsat and AWiFS time-series images
Routine acquisition of Landsat 5 Thematic Mapper (TM) data was discontinued recently and Landsat 7 Enhanced Thematic Mapper Plus (ETM+) has an ongoing problem with the scan line corrector (SLC), thereby creating spatial gaps when covering images obtained during the process. Since temporal and spatial discontinuities of Landsat data are now imminent, it is therefore important to investigate other p
Authors
Xuexia Chen, James E. Vogelmann, Gyanesh Chander, Lei Ji, Brian Tolk, Chengquan Huang, Matthew Rollins
Assessment of spectral, misregistration, and spatial uncertainties inherent in the cross-calibration study
Cross-calibration of satellite sensors permits the quantitative comparison of measurements obtained from different Earth Observing (EO) systems. Cross-calibration studies usually use simultaneous or near-simultaneous observations from several spaceborne sensors to develop band-by-band relationships through regression analysis. The investigation described in this paper focuses on evaluation of the
Authors
G. Chander, D. L. Helder, David Aaron, N. Mishra, A.K. Shrestha
Applications of spectral band adjustment factors (SBAF) for cross-calibration
To monitor land surface processes over a wide range of temporal and spatial scales, it is critical to have coordinated observations of the Earth's surface acquired from multiple spaceborne imaging sensors. However, an integrated global observation framework requires an understanding of how land surface processes are seen differently by various sensors. This is particularly true for sensors acquiri
Authors
Gyanesh Chander
Overview of intercalibration of satellite instruments
Inter-calibration of satellite instruments is critical for detection and quantification of changes in the Earth’s environment, weather forecasting, understanding climate processes, and monitoring climate and land cover change. These applications use data from many satellites; for the data to be inter-operable, the instruments must be cross-calibrated. To meet the stringent needs of such applicatio
Authors
G. Chander, T.J. Hewison, N. Fox, X. Wu, X. Xiong, W.J. Blackwell
Landsat Data Continuity Mission, now Landsat-8: six months on-orbit
The Landsat Data Continuity Mission (LDCM) with two pushbroom Earth-imaging sensors, the Operational Land Imager (OLI) and the Thermal InfraRed Sensor (TIRS), was launched on February 11, 2013. Its on-orbit check out period or commissioning phase lasted about 90 days. During this phase the spacecraft and its instruments were activated, operationally tested and their performance verified. In additi
Authors
Brian L. Markham, James C. Storey, James R. Irons
Characterizing LEDAPS surface reflectance products by comparisons with AERONET, field spectrometer, and MODIS data
This study provides a baseline quality check on provisional Landsat Surface Reflectance (SR) products as generated by the U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center using Landsat Ecosystem Disturbance Adaptive Processing System (LEDAPS) software. Characterization of the Landsat SR products leveraged comparisons between aerosol optical thickness derived from
Authors
Tom Maiersperger, Pat Scaramuzza, Larry Leigh, S. Shrestha, Kevin Gallo, Calli B. Jenkerson, John L. Dwyer
Foreword to the special issue on intercalibration of satellite instruments
This forty papers in this special issue focus on how intercalibration and comparison between sensors can provide an effective and convenient means of verifying their postlaunch performance and correcting their measurement differences.
Authors
Gyanesh Chander, T.J. Hewison, Nigel Fox, Xiangqian Wu, Xiaoxiong Xiong, William J. Blackwell
Multitemporal cross-calibration of the Terra MODIS and Landsat 7 ETM+ reflective solar bands
In recent years, there has been a significant increase in the use of remotely sensed data to address global issues. With the open data policy, the data from the Moderate Resolution Imaging Spectroradiometer (MODIS) and Enhanced Thematic Mapper Plus (ETM+) sensors have become a critical component of numerous applications. These two sensors have been operational for more than a decade, providing a r
Authors
Amit Angal, Xiaoxiong Xiong, Aisheng Wu, Gyanesh Chander, Taeyoung Choi
Landsat 4 Thematic Mapper calibration update
The Landsat 4 Thematic Mapper (TM) collected imagery of the Earth's surface from 1982 to 1993. Although largely overshadowed by Landsat 5 which was launched in 1984, Landsat 4 TM imagery extends the TM-based record of the Earth back to 1982 and also substantially supplements the image archive collected by Landsat 5. To provide a consistent calibration record for the TM instruments, Landsat 4 TM wa
Authors
Dennis L. Helder, Rimy Malla, Cory J. Mettler, Brian L. Markham, Esad Micijevic
The next Landsat satellite: The Landsat Data Continuity Mission
The National Aeronautics and Space Administration (NASA) and the Department of Interior United States Geological Survey (USGS) are developing the successor mission to Landsat 7 that is currently known as the Landsat Data Continuity Mission (LDCM). NASA is responsible for building and launching the LDCM satellite observatory. USGS is building the ground system and will assume responsibility for sat
Authors
James R. Irons, John L. Dwyer, Julia A. Barsi