29 results on '"*OPTICAL radar"'
Search Results
2. Recent degradation of interior Alaska permafrost mapped with ground surveys, geophysics, deep drilling, and repeat airborne lidar.
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Douglas, Thomas A., Hiemstra, Christopher A., Anderson, John E., Barbato, Robyn A., Bjella, Kevin L., Deeb, Elias J., Gelvin, Arthur B., Nelsen, Patricia E., Newman, Stephen D., Saari, Stephanie P., and Wagner, Anna M.
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TUNDRAS , *GEOPHYSICS , *PERMAFROST , *OPTICAL radar , *LIDAR , *SEASONS - Abstract
Permafrost underlies one-quarter of the Northern Hemisphere but is at increasing risk of thaw from climate warming. Recent studies across the Arctic have identified areas of rapid permafrost degradation from both top-down and lateral thaw. Of particular concern is thawing syngenetic "yedoma" permafrost which is ice-rich and has a high carbon content. This type of permafrost is common in the region around Fairbanks, Alaska, and across central Alaska expanding westward to the Seward Peninsula. A major knowledge gap is relating belowground measurements of seasonal thaw, permafrost characteristics, and residual thaw layer development with aboveground ecotype properties and thermokarst expansion that can readily quantify vegetation cover and track surface elevation changes over time. This study was conducted from 2013 to 2020 along four 400 to 500 m long transects near Fairbanks, Alaska. Repeat active layer depths, near-surface permafrost temperature measurements, electrical resistivity tomography (ERT), deep (> 5 m) boreholes, and repeat airborne light detection and ranging (lidar) were used to measure top-down permafrost thaw and map thermokarst development at the sites. Our study confirms previous work using ERT to map surface thawed zones; however, our deep boreholes confirm the boundaries between frozen and thawed zones that are needed to model top-down, lateral, and bottom-up thaw. At disturbed sites seasonal thaw increased up to 25 % between mid-August and early October and suggests measurements to evaluate active layer depth must be made as late in the fall season as possible because the projected increase in the summer season of just a few weeks could lead to significant additional thaw. At our sites, tussock tundra and spruce forest are associated with the lowest mean annual near-surface permafrost temperatures while mixed-forest ecotypes are the warmest and exhibit the highest degree of recent temperature warming and thaw degradation. Thermokarst features, residual thaw layers, and taliks have been identified at all sites. Our measurements, when combined with longer-term records from yedoma across the 500 000 km 2 area of central Alaska, show widespread near-surface permafrost thaw since 2010. Projecting our thaw depth increases, by ecotype, across the yedoma domain, we calculate a first-order estimate that 0.44 Pg of organic carbon in permafrost soil has thawed over the past 7 years, which, for perspective, is an amount of carbon nearly equal to the yearly CO 2 emissions of Australia. Since the yedoma permafrost and the variety of ecotypes at our sites represent much of the Arctic and subarctic land cover, this study shows remote sensing measurements, top-down and bottom-up thermal modeling, and ground-based surveys can be used predictively to identify areas of the highest risk for permafrost thaw from projected future climate warming. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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- View/download PDF
3. Geomorphic expression and slip rate of the Fairweather fault, southeast Alaska, and evidence for predecessors of the 1958 rupture.
- Author
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Witter, Robert C., Bender, Adrian M., Scharer, Katherine M., DuRoss, Christopher B., Haeussler, Peter J., and Lease, Richard O.
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PALEOSEISMOLOGY , *GEOLOGIC faults , *SURFACE fault ruptures , *OPTICAL radar , *LIDAR , *DEFORMATION potential , *DIGITAL maps , *EARTHQUAKE magnitude - Abstract
Active traces of the southern Fairweather fault were revealed by light detection and ranging (lidar) and show evidence for transpressional deformation between North America and the Yakutat block in southeast Alaska. We map the Holocene geomorphic expression of tectonic deformation along the southern 30 km of the Fairweather fault, which ruptured in the 1958 moment magnitude 7.8 earthquake. Digital maps of surficial geology, geomorphology, and active faults illustrate both strike-slip and dip-slip deformation styles within a 10°-30° double restraining bend where the southern Fairweather fault steps offshore to the Queen Charlotte fault. We measure offset landforms along the fault and calibrate legacy 14C data to reassess the rate of Holocene strike-slip motion (=49 mm/yr), which corroborates published estimates that place most of the plate boundary motion on the Fairweather fault. Our slip-rate estimates allow a component of oblique-reverse motion to be accommodated by contractional structures west of the Fairweather fault consistent with geodetic block models. Stratigraphic and structural relations in hand-dug excavations across two active fault strands provide an incomplete paleoseismic record including evidence for up to six surface ruptures in the past 5600 years, and at least two to four events in the past 810 years. The incomplete record suggests an earthquake recurrence interval of =270 years--much longer than intervals <100 years implied by published slip rates and expected earthquake displacements. Our paleoseismic observations and map of active traces of the southern Fairweather fault illustrate the complexity of transpressional deformation and seismic potential along one of Earth's fastest strike-slip plate boundaries. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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4. Development of surface ruptures by hanging-wall extension over a thrust ramp along the Ragged Mountain fault, Katalla, Alaska, USA: Applications of high-resolution three-dimensional terrain models.
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Heinlein, Sarah N., Pavlis, Terry L., and Bruhn, Ronald L.
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RELIEF models , *THRUST faults (Geology) , *SURFACE fault ruptures , *THRUST , *OPTICAL radar , *THREE-dimensional modeling - Abstract
High-resolution three-dimensional terrain models are used to evaluate the Ragged Mountain fault kinematics (Katalla, Alaska, USA). Previous studies have produced contradictory interpretations of the fault's kinematics because surface ruptures along the fault are primarily steeply dipping, uphill-facing normal fault scarps. In this paper, we evaluate the hypothesis that these uphill-facing scarps represent extension above a buried thrust ramp. Detailed geomorphic mapping along the fault, using 20-cm-resolution aerial imagery draped onto a 1-m-resolution lidar (light detection and ranging) elevation model, was used to produce multiple topographic profiles. These profiles illustrate scarp geometries and prominent convex-upward topographic surfaces, indicating significant disturbance by active tectonics. A theoretical model is developed for fault-parallel flow over a thrust ramp that shows the geometric relationships between thrust displacement, upper-plate extension, and ramp dip. An important prediction of the model for this study is that the magnitude of upper-plate extension is comparable to, or greater than, the thrust displacement for ramps with dips greater than ~45°. This model is used to analyze profile shapes and surface displacements in Move software (Midland Valley Ltd.). Analyses of scarp heights allow estimates of hanging-wall extension, which we then use to estimate slip on the underlying thrust via the model. Assuming a low-angle (30°) uniformly dipping thrust and simple longitudinal extension via normal faulting, variations in extension along the fault would require a slip gradient from ~8 m in the north to ~22 m in the south. However, the same north-south variation in extension with a constant slip of 8-10 m may infer an increase in fault dip from ~30° in the north to ~60° in the south. This model prediction has broader implications for active-fault studies. Because the model quantifies relationships between hanging-wall extension, fault slip, and fault dip, it is possible to invert for fault slip in blind thrust ramps where hanging-wall extension is the primary surface manifestation. This study, together with results from the St. Elias Erosion and Tectonics Project (STEEP), clarifies the role of the Ragged Mountain fault as a contractional structure within a broadly sinistral shear system in the western syntaxis of the St. Elias orogeny. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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5. Spaceborne InSAR mapping of landslides and subsidence in rapidly deglaciating terrain, Glacier Bay National Park and Preserve and vicinity, Alaska and British Columbia.
- Author
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Kim, Jinwoo, Coe, Jeffrey A., Lu, Zhong, Avdievitch, Nikita N., and Hults, Chad P.
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LANDSLIDES , *LANDSLIDE hazard analysis , *OPTICAL radar , *GLACIERS , *LITTLE Ice Age , *SYNTHETIC aperture radar , *LAND subsidence - Abstract
The Glacier Bay area in southeastern Alaska and British Columbia, encompassing Glacier Bay National Park and Preserve, has experienced rapid glacier retreat since the end of the Little Ice Age in the mid-1800s. The impact that rapid deglaciation has had on the slope stability of valley walls and on the sedimentation of fans and deltas adjacent to fjords and inlets is an ongoing research topic. Using 3-year (2018–2020) Sentinel-1 datasets, and an automated time-series persistent scatterer interferometric synthetic aperture radar (PSInSAR) processing method, we detected landslides or delta subsidence at 27 sites within a vast 180 × 180 km remote region encompassing Glacier Bay proper. Most of the sites that we identified had not been previously identified. We categorized the hazard source areas that we identified into three general types:1) slow-moving landslides on steep rocky slopes not near (> 2 km away from) present-day glacier termini (e.g., Tidal Inlet landslide), 2) slow-moving landslides directly adjacent to (< 2 km away from), and associated with glacier thinning and retreat, and 3) subsidence of glacial outwash fan deltas. In categories 1 and 2, we observed 22 landslides moving at velocities ranging from 0.5 to 4 cm/yr. In category 3, we detected five fan deltas subsiding at velocities ranging from 0.5 to 6 cm/yr. Within our measurement error, these velocities were consistent during the monitoring period. Because acceleration was not observed, the issuance of warnings of imminent rapid failure is not warranted, however, continued remote monitoring is warranted. Our interferometric synthetic aperture radar (InSAR) results could be combined with other data sets including field observations, subaerial and submarine landslide inventories, bedrock fabric mapping from newly available light detection and ranging (lidar) data, and geologic maps to produce an inherent susceptibility map for landslides in bedrock and fan deltas. This map could be used to forecast susceptibility for both earthquake and climatically induced landslides. • The Glacier Bay region in Alaska has been monitored by Sentinel-1 PSInSAR. • Twenty-seven slow-moving landslides and subsidence areas were identified. • Hazards are related to glacier retreat, permafrost degradation, melting in deltas. • Continued remote monitoring of the area is needed to better quantify geohazards. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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6. A Virtual Necropsy: Applications of 3D Scanning for Marine Mammal Pathology and Education.
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Chenoweth, Ellen M., Houston, Josh, Burek Huntington, Kathy, and Straley, Jan M.
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MARINE mammals , *AUTOPSY , *OPTICAL radar , *HUMPBACK whale , *LIDAR , *DEAD - Abstract
Simple Summary: Most whale biologists spend their careers in boats, getting a glimpse at whales only when they come up to the surface to breathe or occasionally to feed. Being able to walk right up to a whale, and even look inside its body, offers scientists and stranding network volunteers a rare and meaningful opportunity to learn from whales at close range. On 14 March 2021, a female adult humpback whale was found dead on a beach near Sitka, Alaska. A team of volunteers performed a necropsy, meaning they dissected the whale to gather information about its cause of death and collected samples for further research (NOAA Fisheries permit 18786-01). Before, during and after the necropsy, the whale was three-dimensionally (3D) scanned using a drone and an iPad. These scans were annotated and arranged into a free publicallyavailable resource known as the 4D virtual necropsy (with time as the 4th dimension). After one month, we documented broad interest in this resource from researchers, educators, community members, and volunteers who respond to marine mammal strandings. We believe 3D scanning of future stranded animals will be useful for a wide range of applications. Stranded large whales represent an opportunity to learn about the anatomy and health of these cryptic free-ranging animals. However, where time and access is frequently limited, law enforcement and management priorities often take precedence over research, outreach, and educational uses. On 14 March 2021, a dead female adult humpback whale was reported stranded on an uninhabited island 15 miles west of Sitka, Alaska. The whale was three-dimensionally scanned using light detection and ranging (LiDAR) and photogrammetry before, during, and at multiple time points after a necropsy, including full decomposition 17 days later (NOAA Fisheries permit 18786-01). These scans were organized and displayed on the site Sketchfab with annotations and made publically available as a "4D virtual necropsy" (the fourth dimension is time). After one month, our user survey indicated widespread interest in the platform by both the local community and worldwide by stranding professionals, researchers, and educators. We are unaware of another 3D scan involving a large whale with soft tissue for teaching, research, or public display, despite the ease of 3D scanning with current technologies and the wide-ranging applications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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7. The Accuracy and Consistency of 3D Elevation Program Data: A Systematic Analysis.
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Stoker, Jason and Miller, Barry
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SYNTHETIC apertures , *ACQUISITION of data , *OPTICAL radar , *LIDAR , *SYNTHETIC aperture radar , *DATA analysis , *DIGITAL elevation models - Abstract
The 3D Elevation Program (3DEP) has created partnership opportunities to increase the collection of high-resolution elevation data across the United States, eventually leading to complete coverage of high-resolution, three-dimensional (3D) information from light detection and ranging (lidar) data across the entire country (interferometric synthetic aperture radar in Alaska). While 3DEP data are collected at different times and by varying producers, the assumption is that the use of the 3DEP Lidar Base Specification will provide standardized and consistent data across data collections. Another assumption is that the integration of lidar data into the seamless digital elevation models increases the accuracy of the derived products. This study tests these assumptions and updates some of the accuracy metrics that were done on previous versions of the standard products. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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8. Evaluation of Satellite Imagery for Monitoring Pacific Walruses at a Large Coastal Haulout.
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Fischbach, Anthony S. and Douglas, David C.
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SYNTHETIC aperture radar , *WALRUS , *REMOTE-sensing images , *OPTICAL radar , *OPTICAL sensors - Abstract
Pacific walruses (Odobenus rosmarus divergens) are using coastal haulouts in the Chukchi Sea more often and in larger numbers to rest between foraging bouts in late summer and autumn in recent years, because climate warming has reduced availability of sea ice that historically had provided resting platforms near their preferred benthic feeding grounds. With greater numbers of walruses hauling out in large aggregations, new opportunities are presented for monitoring the population. Here we evaluate different types of satellite imagery for detecting and delineating the peripheries of walrus aggregations at a commonly used haulout near Point Lay, Alaska, in 2018–2020. We evaluated optical and radar imagery ranging in pixel resolutions from 40 m to ~1 m: specifically, optical imagery from Landsat, Sentinel-2, Planet Labs, and DigitalGlobe, and synthetic aperture radar (SAR) imagery from Sentinel-1 and TerraSAR-X. Three observers independently examined satellite images to detect walrus aggregations and digitized their peripheries using visual interpretation. We compared interpretations between observers and to high-resolution (~2 cm) ortho-corrected imagery collected by a small unoccupied aerial system (UAS). Roughly two-thirds of the time, clouds precluded clear optical views of the study area from satellite. SAR was unaffected by clouds (and darkness) and provided unambiguous signatures of walrus aggregations at the Point Lay haulout. Among imagery types with 4–10 m resolution, observers unanimously agreed on all detections of walruses, and attained an average 65% overlap (sd 12.0, n 100) in their delineations of aggregation boundaries. For imagery with ~1 m resolution, overlap agreement was higher (mean 85%, sd 3.0, n 11). We found that optical satellite sensors with moderate resolution and high revisitation rates, such as PlanetScope and Sentinel-2, demonstrated robust and repeatable qualities for monitoring walrus haulouts, but temporal gaps between observations due to clouds were common. SAR imagery also demonstrated robust capabilities for monitoring the Point Lay haulout, but more research is needed to evaluate SAR at haulouts with more complex local terrain and beach substrates. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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9. Predicting the Planform Configuration of the Braided Toklat River, Alaska, With a Suite of Rule-Based Models 1 Predicting the Planform Configuration of the Braided Toklat River, Alaska, With a Suite of Rule-Based Models.
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Podolak, Charles J.P.
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NATIONAL parks & reserves , *RIPARIAN areas , *LASER based sensors , *OPTICAL radar - Abstract
An ensemble of rule-based models was constructed to assess possible future braided river planform configurations for the Toklat River in Denali National Park and Preserve, Alaska. This approach combined an analysis of large-scale influences on stability with several reduced-complexity models to produce the predictions at a practical level for managers concerned about the persistence of bank erosion while acknowledging the great uncertainty in any landscape prediction. First, a model of confluence angles reproduced observed angles of a major confluence, but showed limited susceptibility to a major rearrangement of the channel planform downstream. Second, a probabilistic map of channel locations was created with a two-parameter channel avulsion model. The predicted channel belt location was concentrated in the same area as the current channel belt. Finally, a suite of valley-scale channel and braid plain characteristics were extracted from a light detection and ranging (LiDAR)-derived surface. The characteristics demonstrated large-scale stabilizing topographic influences on channel planform. The combination of independent analyses increased confidence in the conclusion that the Toklat River braided planform is a dynamically stable system due to large and persistent valley-scale influences, and that a range of avulsive perturbations are likely to result in a relatively unchanged planform configuration in the short term. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
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10. Quantifying and relating land-surface and subsurface variability in permafrost environments using LiDAR and surface geophysical datasets.
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Hubbard, S., Gangodagamage, C., Dafflon, B., Wainwright, H., Peterson, J., Gusmeroli, A., Ulrich, C., Wu, Y., Wilson, C., Rowland, J., Tweedie, C., and Wullschleger, S.
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GEOMORPHOLOGY , *PERMAFROST , *FROZEN ground , *OPTICAL radar , *GROUND penetrating radar , *GLOBAL Positioning System - Abstract
The value of remote sensing and surface geophysical data for characterizing the spatial variability and relationships between land-surface and subsurface properties was explored in an Alaska (USA) coastal plain ecosystem. At this site, a nested suite of measurements was collected within a region where the land surface was dominated by polygons, including: LiDAR data; ground-penetrating radar, electromagnetic, and electrical-resistance tomography data; active-layer depth, soil temperature, soil-moisture content, soil texture, soil carbon and nitrogen content; and pore-fluid cations. LiDAR data were used to extract geomorphic metrics, which potentially indicate drainage potential. Geophysical data were used to characterize active-layer depth, soil-moisture content, and permafrost variability. Cluster analysis of the LiDAR and geophysical attributes revealed the presence of three spatial zones, which had unique distributions of geomorphic, hydrological, thermal, and geochemical properties. The correspondence between the LiDAR-based geomorphic zonation and the geophysics-based active-layer and permafrost zonation highlights the significant linkage between these ecosystem compartments. This study suggests the potential of combining LiDAR and surface geophysical measurements for providing high-resolution information about land-surface and subsurface properties as well as their spatial variations and linkages, all of which are important for quantifying terrestrial-ecosystem evolution and feedbacks to climate. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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11. Opportunistic validation of sulfur dioxide in the Sarychev Peak volcanic eruption cloud.
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Carn, S. A. and Lopez, T. M.
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SULFUR dioxide , *GEOGRAPHIC information systems , *VOLCANIC eruptions , *ULTRAVIOLET spectrometry , *OPTICAL radar - Abstract
The article discusses the validation of the ozone monitoring instrument (OMI) retrievals of sulfur dioxide (SO2) in the volcanic eruption cloud from Sarychev Peak in Kuril Islands, Russia. It states that a ground-based ultraviolet (UV) spectrometer, FLYSPEC, was deployed as volcanic cloud drifted over Central Alaska. It is also noted that the CALIPSO lidar observations were used to constrain the volcanic cloud with an altitude of 12-14 kilometers.
- Published
- 2011
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12. Application of LIDAR to resolving bedrock structure in areas of poor exposure: An example from the STEEP study area, southern Alaska.
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Pavlis, Terry L. and Bruhn, Ronald L.
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BEDROCK , *STRUCTURAL geology , *OPTICAL radar , *GEOLOGIC faults , *RADAR in earth sciences , *STRATIGRAPHIC geology - Published
- 2011
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13. Origin of sackung uphill-facing scarps in the Saint Elias orogen, Alaska: LIDAR data visualization and stress modeling.
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Zhiyong Li, Bruhn, R. L., Pavlis, T. L., Vorkink, M., and Zuoxun Zeng
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GEOLOGICAL modeling , *STRAINS & stresses (Mechanics) , *OPTICAL radar , *QUATERNARY stratigraphic geology , *GEOLOGIC faults , *GEOLOGICAL formations , *EARTHQUAKES - Published
- 2010
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14. Noctilucent cloud in the western Arctic in 2005: Simultaneous lidar and camera observations and analysis
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Collins, R.L., Taylor, M.J., Nielsen, K., Mizutani, K., Murayama, Y., Sakanoi, K., and DeLand, M.T.
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NOCTILUCENT clouds , *OPTICAL radar , *RESEARCH institutes , *BACKSCATTERING , *METEOROLOGICAL observations , *ASTRONOMICAL photometry - Abstract
Abstract: We report observations of a noctilucent cloud (NLC) over central Alaska by a ground-based lidar and camera on the night of 9–10 August 2005. The lidar at Poker Flat Research Range (PFRR), Chatanika (65°N, 147°W) measured a maximum integrated backscatter coefficient of 2.4×10−6 sr−1 with a peak backscatter coefficient of 2.6×10−9 m−1 sr−1 corresponding to an aerosol backscatter ratio of 120 at an altitude of 82.1km. The camera at Donnelly Dome, 168km southeast of PFRR, recorded an extensive NLC display across the sky with distinct filamentary features corresponding to wave structures measured by the lidar. The occurrence of the maximum integrated backscatter coefficient corresponded to the passage of a bright cloud band to the southwest over PFRR. The camera observations indicate that the cloud band had a horizontal width of 50km and a length of 150km. The horizontal scale of the cloud band was confirmed by medium-frequency radar wind measurements that reported mesopause region winds of 30m/s to the southwest during the period when the cloud band passed over PFRR. Comparison of these measurements with current NLC microphysical models suggests a lower bound on the water vapor mixing ratio at 83km of 7–9ppmv and a cloud ice mass of 1.5–1.8×103 kg. Satellite measurements show that this NLC display occurred during a burst of cloud activity that began on 5 August and lasted for 10 days. This cloud appeared 10 days after a launch of the space shuttle. We discuss the appearance of NLCs in August over several years at this lower polar latitude site in terms of planetary wave activity and space shuttle launches. [Copyright &y& Elsevier]
- Published
- 2009
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15. LiDAR REMOTE SENSING DATA COLLECTION: ALASKA PIPELINE, AK DELIVERY 5.
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OPTICAL radar , *ACQUISITION of data ,TRANS-Alaska Pipeline (Alaska) ,DALTON Highway (Alaska) - Abstract
The article reports on the collection of the sixth batch of light detection and ranging data collected by Watershed Sciences, Inc. from the Alaska Pipeline for the Alaska Department of Natural Sciences. Data collection was conducted between May 22 and May 31, 2011. The sixth batch of data was collected from 293,337 acres within the requested area, which was later expanded. The area traces Dalton Highway from near the Five Mile Airstrip southeast of North Pole.
- Published
- 2011
16. LiDAR REMOTE SENSING DATA COLLECTION: ALASKA PIPELINE, AK DELIVERY 3.
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OPTICAL radar , *ACQUISITION of data , *WATERSHEDS , *NATURAL history - Abstract
The article reports on the collection of the third batch of light detection and ranging data collected by Watershed Sciences, Inc. from the Alaska Pipeline for the Alaska Department of Natural Sciences. Data collection was conducted between October 2 and 4 of 2010. The third batch of data was collected from 39,744 acres within the requested area. The area consisted of portions of the Alaskan Highway 2 east of the Tetlin Junction to Paradise Hill.
- Published
- 2011
17. LiDAR REMOTE SENSING DATA COLLECTION: ALASKA PIPELINE, AK DELIVERY 5.
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OPTICAL radar , *ACQUISITION of data , *UNIVERSAL transverse Mercator projection (Cartography) , *NATURAL gas pipelines ,TRANS-Alaska Pipeline (Alaska) - Abstract
The article reports on the collection of the fifth batch of light detection and ranging data collected by Watershed Sciences, Inc. from the Alaska Pipeline for the Alaska Department of Natural Sciences. Data collection was conducted between May 17 and June 16, 2011. The fifth batch of data was collected from 226,450 acres within the requested area, which was later expanded. The area consisted of all Universal Transverse Mercator Zone 5 portions of the pipeline project.
- Published
- 2011
18. LiDAR REMOTE SENSING DATA COLLECTION: ALASKA PIPELINE, AK DELIVERY 4.
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OPTICAL radar , *ACQUISITION of data ,ALASKA Highway ,TRANS-Alaska Pipeline (Alaska) - Abstract
The article reports on the collection of the fourth batch of light detection and ranging data collected by Watershed Sciences, Inc. from the Alaska Pipeline for the Alaska Department of Natural Sciences. Data collection was conducted between May 17 and 26 of 2011. The fourth batch of data was collected from 159,433 acres within the requested area, which was later expanded. The area consisted of portions of the Alaskan Highway 2 from North Pole to just north of Delta Junction.
- Published
- 2011
19. Alaska Gasline LiDAR Project Delivery 2 - All Points.
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OPTICAL radar , *ACQUISITION of data , *NATURAL gas pipelines - Abstract
A tabular representation of the second batch of light detection and ranging data collected by Watershed Sciences, Inc. from the Alaska Pipeline for the Alaska Department of Natural Sciences is presented.
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- 2011
20. LiDAR REMOTE SENSING DATA COLLECTION: ALASKA PIPELINE, AK DELIVERY 2.
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OPTICAL radar , *ACQUISITION of data ,ALASKA Highway ,TRANS-Alaska Pipeline (Alaska) - Abstract
The article reports on the collection of the second batch of light detection and ranging by Watershed Sciences, Inc. from the Alaska Pipeline for the Alaska Department of Natural Sciences. Data collection was conducted between September 17 and October 22, 2010. The second batch of data was collected from 94,885 acres within the requested area, which was later expanded, resulting in 99,594 acres. The area consisted of portions of the Alaskan Highway east of Johnson River to Robertson River.
- Published
- 2011
21. LiDAR REMOTE SENSING DATA COLLECTION: ALASKA PIPELINE, AK DELIVERY 1.
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OPTICAL radar , *ACQUISITION of data ,ALASKA Highway ,TRANS-Alaska Pipeline (Alaska) - Abstract
The article reports on the collection of the first batch of light detection and ranging data by Watershed Sciences, Inc. from the Alaska Pipeline for the Alaska Department of Natural Sciences. Data collection was conducted between September 21 and October 1, 2010. The first batch of data was collected from 117,357 acres within the requested area, which was later expanded. The area consisted of portions of the Alaskan Highway east of the Johnson River to Robertson River.
- Published
- 2011
22. Alaska DNR LIDAR Project, 2010 - Delivery 6 QC Analysis.
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QUALITY control , *OPTICAL radar , *ACQUISITION of data , *PIPELINE rights-of-way ,OREGON. Dept. of Geology & Mineral Industries - Abstract
The article reports on the quality control analysis conducted by the Oregon Department of Geology and Mineral Industries on the sixth and final batch of high-resolution light detection and ranging topographic data collected by Watershed Sciences, Inc. from a swath of roughly parallel to proposed future pipeline rights of way in Alaska in 2010. Data products included bare earth grids, highest hit grids, intensity tapped image file, and ground Log ASCII Standard.
- Published
- 2011
23. Alaska DNR LIDAR Project, 2010 - Delivery 5 QC Analysis.
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QUALITY control , *OPTICAL radar , *ACQUISITION of data , *PIPELINE rights-of-way ,OREGON. Dept. of Geology & Mineral Industries - Abstract
The article reports on the quality control analysis conducted by the Oregon Department of Geology and Mineral Industries on the fifth batch of high-resolution light detection and ranging topographic data collected by Watershed Sciences, Inc. from a swath of roughly parallel to proposed future pipeline rights of way in Alaska in 2010. Data products included bare earth grids, highest hit grids, intensity tapped image file, and ground Log ASCII Standard.
- Published
- 2011
24. Alaska DNR LIDAR Project, 2010 - Delivery 4 QC Analysis.
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QUALITY control , *OPTICAL radar , *ACQUISITION of data , *PIPELINE rights-of-way ,OREGON. Dept. of Geology & Mineral Industries - Abstract
The article reports on the quality control analysis conducted by the Oregon Department of Geology and Mineral Industries on the fourth batch of high-resolution light detection and ranging topographic data collected by Watershed Sciences, Inc. from a swath of roughly parallel to proposed future pipeline rights of way in Alaska in 2010. Data products included bare earth grids, highest hit grids, intensity tapped image file, and ground Log ASCII Standard.
- Published
- 2011
25. Alaska DNR LIDAR Project, 2010 - Delivery 3 QC Analysis.
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QUALITY control , *OPTICAL radar , *ACQUISITION of data , *PIPELINE rights-of-way ,OREGON. Dept. of Geology & Mineral Industries - Abstract
The article reports on the quality control analysis conducted by the Oregon Department of Geology and Mineral Industries on the third batch of high-resolution light detection and ranging topographic data collected by Watershed Sciences, Inc. from a swath of roughly parallel to proposed future pipeline rights of way in Alaska in 2010. Data products included bare earth grids, highest hit grids, intensity tapped image file, and ground Log ASCII Standard.
- Published
- 2011
26. Alaska DNR LIDAR Project, 2010 - Delivery 1 QC Analysis.
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QUALITY control , *OPTICAL radar , *PIPELINE rights-of-way ,OREGON. Dept. of Geology & Mineral Industries - Abstract
The article reports on the quality control analysis conducted by the Oregon Department of Geology and Mineral Industries on the first batch of high-resolution light detection and ranging topographic data collected by Watershed Sciences, Inc. from a swath of roughly parallel to proposed future pipeline rights of way in Alaska in 2010. Data products included bare earth grids, highest hit grids, intensity tapped image file, and ground Log ASCII Standard.
- Published
- 2011
27. Alaska DNR LIDAR Project, 2010 - Delivery 2 QC Analysis.
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QUALITY control , *OPTICAL radar , *PIPELINE rights-of-way ,OREGON. Dept. of Geology & Mineral Industries - Abstract
The article reports on the quality control analysis conducted by the Oregon Department of Geology and Mineral Industries on the second batch of high-resolution light detection and ranging topographic data collected by Watershed Sciences, Inc. from a swath of roughly parallel to proposed future pipeline rights of way in Alaska in 2010. Data products included bare earth grids, highest hit grids, intensity tapped image file, and ground Log ASCII Standard.
- Published
- 2011
28. HIGH-RESOLUTION LIDAR DATA FOR ALASKA INFRASTRUCTURE CORRIDORS.
- Author
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Hubbard, T. D., Koehler, R. D., and Combellick, R. A.
- Subjects
- *
OPTICAL radar , *GAS pipeline design & construction , *NATURAL gas , *GEOLOGIC faults - Abstract
The article focuses on the provision of high-resolution light detection and ranging (LIDAR) data for use in the design, permitting, and construction of potential gas pipelines in Alaska. The pipelines will aim to deliver North Slope natural gas to out-of-state and Alaskan customers. LIDAR data, made available by the Alaskan Department of Natural Resources, will be used for assessing active faulting, slope instability, thaw settlement, erosion, and other engineering issues.
- Published
- 2011
29. Paleoseismic study of the Cathedral Rapids fault in the Northern Alaska Range near Tok, Alaska.
- Author
-
Koehler, Rich D., Farrell, Rebecca-Ellen, and Carver, Gary A.
- Subjects
- *
GEOLOGICAL surveys , *TRENCHES , *GEOLOGIC faults , *SHEAR strength of soils , *SOIL mechanics , *OPTICAL radar - Abstract
The article presents the results of a trench investigation across a scarp in the field and the Cathedral Rapids fault in Alaska. Particular focus is given to compression and shear driven by north-northwest relative motion between the Pacific and North American plates. It describes the extension of the Cathedral Rapids fault and the Light Detection And Ranging (LIDAR) imagery of the trench site. A geologic map of the trench site is also presented.
- Published
- 2010
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