Publications
Filter Total Items: 158
An overview of sensor calibration inter-comparison and applications
Long-term climate data records (CDR) are often constructed using observations made by multiple Earth observing sensors over a broad range of spectra and a large scale in both time and space. These sensors can be of the same or different types operated on the same or different platforms. They can be developed and built with different technologies and are likely operated over different time spans. I
Authors
Xiaoxiong Xiong, Changyong Cao, Gyanesh Chander
Introduction to the special issue-Terrestrial reference standard test sites for postlaunch calibration
No abstract available.
Authors
Gyanesh Chander, P. M. Teillet
Monitoring on-orbit calibration stability of the Terra MODIS and Landsat 7 ETM+ sensors using pseudo-invariant test sites
The ability to detect and quantify changes in the Earth's environment depends on sensors that can provide calibrated, consistent measurements of the Earth's surface features through time. A critical step in this process is to put image data from different sensors onto a common radiometric scale. This work focuses on monitoring the long-term on-orbit calibration stability of the Terra Moderate Reso
Authors
G. Chander, X.(J.) Xiong, T.(J.) Choi, A. Angal
Radiometric, geometric, and image quality assessment of ALOS AVNIR-2 and PRISM sensors
The Advanced Land Observing Satellite (ALOS) was launched on January 24, 2006, by a Japan Aerospace Exploration Agency (JAXA) H-IIA launcher. It carries three remote-sensing sensors: 1) the Advanced Visible and Near-Infrared Radiometer type 2 (AVNIR-2); 2) the Panchromatic Remote-Sensing Instrument for Stereo Mapping (PRISM); and 3) the Phased-Array type L-band Synthetic Aperture Radar (PALSAR). W
Authors
S. Saunier, P. Goryl, G. Chander, R. Santer, M. Bouvet, B. Collet, A. Mambimba, Aksakal S. Kocaman
Geometric evaluation and validation of aerial and satellite data using Sioux Falls Geometric test range
No abstract available.
Authors
Aparajithan Sampath, Donald Moe, Jon Christopherson, Gregory L. Stensaas
Using the Sonoran and Libyan Desert test sites to monitor the temporal stability of reflective solar bands for Landsat 7 enhanced thematic mapper plus and Terra moderate resolution imaging spectroradiometer sensors
Remote sensing imagery is effective for monitoring environmental and climatic changes because of the extent of the global coverage and long time scale of the observations. Radiometric calibration of remote sensing sensors is essential for quantitative & qualitative science and applications. Pseudo-invariant ground targets have been extensively used to monitor the long-term radiometric calibration
Authors
Amit Angal, Xiaoxiong Xiong, Tae-young Choi, Gyanesh Chander, Aisheng Wu
Terrestrial reference standard sites for postlaunch sensor calibration
In an era when the number of Earth observation satellites is rapidly growing and measurements from satellite sensors are used to address increasingly urgent global issues, often through synergistic and operational combinations of data from multiple sources, it is imperative that scientists and decision-makers are able to rely on the accuracy of Earth observation data products. The characterization
Authors
P. M. Teillet, G. Chander
Assessment of the short-term radiometric stability between Terra MODIS and Landsat 7 ETM+ sensors
Short-term radiometric stability was evaluated using continuous ETM+ scenes within a single orbit (contact period) and the corresponding MODIS scenes for the four matching solar reflective visible and near-infrared (VNIR) band pairs between the two sensors. The near-simultaneous earth observations were limited by the smaller swath size of ETM+ (183 km) compared to MODIS (2330 km). Two sets of cont
Authors
Taeyoung Choi, Xiaoxiong Xiong, Gyanesh Chander, A. Angal
SSTL UK-DMC SLIM-6 data quality assessment
Satellite data from the Surrey Satellite Technology Limited (SSTL) United Kingdom (UK) Disaster Monitoring Constellation (DMC) were assessed for geometric and radiometric quality. The UK-DMC Surrey Linear Imager 6 (SLIM-6) sensor has a 32-m spatial resolution and a ground swath width of 640 km. The UK-DMC SLIM-6 design consists of a three-band imager with green, red, and near-infrared bands that a
Authors
G. Chander, S. Saunier, M.J. Choate, P. L. Scaramuzza
Using the Sonoran Desert test site to monitor the long-term radiometric stability of the Landsat TM/ETM+ and Terra MODIS sensors
Pseudo-invariant ground targets have been extensively used to monitor the long-term radiometric calibration stability of remote sensing instruments. The NASA MODIS Characterization Support Team (MCST), in collaboration with members from the U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center, has previously demonstrated the use of pseudo-invariant ground sites for t
Authors
A. Angal, X. Xiong, T. Choi, G. Chander, A. Wu
Summary of current radiometric calibration coefficients for Landsat MSS, TM, ETM+, and EO-1 ALI sensors
This paper provides a summary of the current equations and rescaling factors for converting calibrated Digital Numbers (DNs) to absolute units of at-sensor spectral radiance, Top-Of-Atmosphere (TOA) reflectance, and at-sensor brightness temperature. It tabulates the necessary constants for the Multispectral Scanner (MSS), Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+), and Advanced Lan
Authors
G. Chander, B. L. Markham, D. L. Helder
An assessment of African test sites in the context of a global network of quality-assured reference standards
The Committee on Earth Observation Satellites (CEOS) Infrared and Visible Optical Sensors (IVOS) subgroup members established a set of CEOS-endorsed globally distributed reference standard test sites for the postlaunch calibration of space-based optical imaging sensors. This paper discusses the top five African pseudo-invariant sites (Libya 4, Mauritania 1/2, Algeria 3, Libya 1, and Algeria 5) tha
Authors
G. Chander, X. Xiong, A. Angal, T. Choi