Researcher and Education program Director at Utah State University, Logan Utah
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Papers by Gary O'Brien
The Blurred Line between Form and Process: A Comparison of Stream Channel Classification Frameworks
PLOS ONE, 2016
Stream classification provides a means to understand the diversity and distribution of channels a... more Stream classification provides a means to understand the diversity and distribution of channels and floodplains that occur across a landscape while identifying links between geomorphic form and process. Accordingly, stream classification is frequently employed as a watershed planning, management, and restoration tool. At the same time, there has been intense debate and criticism of particular frameworks, on the grounds that these frameworks classify stream reaches based largely on their physical form, rather than direct measurements of their component hydrogeomorphic processes. Despite this debate surrounding stream classifications, and their ongoing use in watershed management, direct comparisons of channel classification frameworks are rare. Here we implement four stream classification frameworks and explore the degree to which each make inferences about hydrogeomorphic process from channel form within the Middle Fork John Day Basin, a watershed of high conservation interest within the Columbia River Basin, U.S.A. We compare the results of the River Styles Framework, Natural Channel Classification, Rosgen Classification System, and a channel form-based statistical classification at 33 field-monitored sites. We found that the four frameworks consistently classified reach types into similar groups based on each reach or segment's dominant hydrogeomorphic elements. Where classified channel types diverged, differences could be attributed to the (a) spatial scale of input data used, (b) the requisite metrics and their order in completing a framework's decision tree and/or, (c) whether the framework attempts to classify current or historic channel form. Divergence in framework agreement was also observed at reaches where channel planform was decoupled from valley setting. Overall, the relative agreement between frameworks indicates that criticism of individual classifications for their use of form in grouping stream channels may be overstated. These form-based criticisms may also ignore the geomorphic tenet that channel form reflects formative hydrogeomorphic processes across a given landscape.
Geomorphic mapping and taxonomy of fluvial landforms
Geomorphology, 2015
Recovery Potential - Middle Fork John Day Watershed
Middle Fork John Day River Recovery Potential
Middle Fork John Day Geomorphic Condition
Middle Fork John Day River Styles
<title>Rapid database prototyping of IR images using simplified physics laws</title>
Targets and Backgrounds VIII: Characterization and Representation, 2002
<title>Efficient high-resolution digital filters for FLIR images</title>
Visual Information Processing, 1992
<title>Study of the effects of focal plane array design parameters on ATR performance</title>
Architecture, Hardware, and Forward-Looking Infrared Issues in Automatic Target Recognition, 1993
Serpentine geometry for enhanced performance of nanometer-thin platinum bolometers
2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), 2013
ABSTRACT We report on the modeling, fabrication and characterization of a new serpentine geometry... more ABSTRACT We report on the modeling, fabrication and characterization of a new serpentine geometry for platinum bolometers realized with plasma-enhanced atomic layer deposition (PEALD). The measured responsivity of 7.5 · 107 VW-1 A-1 of the proposed structure is almost four times higher than that of previously published PEALD deposited platinum bolometers with a traditional square absorber design [1]. This improvement was achieved without increasing the sensor&#39;s footprint or fabrication complexity.
<title>Methodology study for development of a motion imagery quality metric</title>
Airborne Intelligence, Surveillance, Reconnaissance (ISR) Systems and Applications III, 2006
The motion imagery community would benefit from the availability of standard measures for assessi... more The motion imagery community would benefit from the availability of standard measures for assessing image interpretability. The National Imagery Interpretability Rating Scale (NIIRS) has served as a community standard for still imagery, but no comparable scale exists for motion imagery. Several considerations unique to motion imagery indicate that the standard methodology employed in the past for NIIRS development may not
<title>User-oriented evaluation of compression for motion imagery</title>
Airborne Intelligence, Surveillance, Reconnaissance (ISR) Systems and Applications IV, 2007
Motion imagery will play a critical role in future intelligence and military missions. The abilit... more Motion imagery will play a critical role in future intelligence and military missions. The ability to provide a real time, dynamic view and persistent surveillance makes motion imagery a valuable source of information. The ability to collect, process, transmit, and exploit this rich source of information depends on the sensor capabilities, the available communications channels, and the availability of suitable
<title>Metrics to estimate image quality in compressed video sequences</title>
Airborne Intelligence, Surveillance, Reconnaissance (ISR) Systems and Applications IV, 2007
A fundamental problem in image processing is finding objective metrics that parallel human percep... more A fundamental problem in image processing is finding objective metrics that parallel human perception of image quality. In this study, several metrics were examined to quantify compression algorithms in terms of perceived loss of image quality. In addition, we sought to describe the relationship of image quality as a function of bit rate. The compression schemes used were JPEG2000, MPEG2, and H.264. The frame size was fixed at 848x480 and the encoding varied from 6000 k bps to 200 k bps. The metrics examined were peak signal to noise ratio (PSNR), structural similarity (SSIM), edge localization metrics, and a blur metric. To varying degrees, the metrics displayed desirable properties, namely they were monotonic in the bit rate, the group of pictures (GOP) structure could be inferred, and they tended to agree with human perception of quality degradations. Additional work is being conducted to quantify the sensitivity of these measures with respect to our Motion Imagery Quality Scale.
<title>Perceived interpretability of motion imagery: implications for scale development</title>
Airborne Intelligence, Surveillance, Reconnaissance (ISR) Systems and Applications IV, 2007
The motion imagery community would benefit from the availability of standard measures for assessi... more The motion imagery community would benefit from the availability of standard measures for assessing image interpretability. The National Imagery Interpretability Rating Scale (NIIRS) has served as a community standard for still imagery, but no comparable scale exists for motion imagery. Previous studies have explored the factors affecting the perceived interpretability of motion imagery and the ability to perform various image
Visual Information Processing (Proceedings Volume)
... Holben; David H. Rossman. Optimized 3-D recovery from 2-D images using sine-wave-structured l... more ... Holben; David H. Rossman. Optimized 3-D recovery from 2-D images using sine-wave-structured lightillumination. Author(s): Aswinikumar Subramanian; Laurence G. Hassebrook; Prashant Pai. Focal-plane VLSI processing for ...
Targets and Backgrounds VIII: Characterization and Representation (Proceedings Volume)
The differentiated and multi-spectral threat of the future battlespace sets new demands on ground... more The differentiated and multi-spectral threat of the future battlespace sets new demands on ground platforms. This has implications on the whole development process of future ground systems. In the Swedish Signature Management Program SAT/Mark, these issues have been in focus during the last five years. Results from this research and development effort are presented with emphasis on system engineering, simulation and validation of signatures. ... Within the military environment there is a growing interest in the use of synthetic imagery as a ...
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Papers by Gary O'Brien