Evaluating debris slide occurrence using digital data: paraglacial activity in Chilliwack Valley, British Columbia

2009 ◽  
Vol 46 (3) ◽  
pp. 181-191 ◽  
Author(s):  
John Barlow ◽  
Yvonne Martin ◽  
Steven Franklin
Keyword(s):  
British Columbia ◽  
Mass Movement ◽  
Strong Relationship ◽  
Digital Data ◽  
Aerial Photographs ◽  
Digital Products ◽  
Debris Slide ◽  
Mountainous Regions ◽  
Basin Scale ◽  
Elevation Data

Debris sliding is one of the most important processes acting to transport sediment within mountainous regions. Detailed study of debris slide activity at the basin scale typically involves landslide inventories generated from aerial photographs. However, it has been shown that some types of rapid mass movement can be accurately identified using a combination of high-resolution satellite imagery and digital elevation data. This approach is beneficial as the digital products allow for a more accurate and efficient data throughput into various types of geomorphic analysis. Here, we demonstrate the use of an automated inventory in the geomorphometric evaluation of debris slide initiation for the Chilliwack Basin, British Columbia, Canada. Our results indicate that the occurrence of debris sliding is primarily determined by topographical controls. For basins that are in equilibrium with the existing climate, the frequency of debris sliding should demonstrate a strong relationship to bedrock geology as the production of unconsolidated materials available for failure is a function of weathering rates under these conditions. The lack of bedrock control within the Chilliwack Basin suggests a state of paraglacial relaxation, wherein glacial deposits dominate the sediment cascade within the area. Therefore, topographic parameters can be used to discriminate the location of metastable slopes where debris slide erosion will be active. The use of digital data in the characterization of debris slide occurrence would seem to be a viable alternative to the more traditional methods.

scholarly journals THE “URBAN GEOLOGY” PROJECT OF IGME: THE CASE STUDY OF NAFPLIO, ARGOLIS PREFECTURE, GREECE

2017 ◽  
Vol 43 (3) ◽  
pp. 1528
Author(s):  
P. I Tsombos ◽  
A.D. Zervakou
Keyword(s):  
Land Use Planning ◽  
Urban Areas ◽  
Mineral Exploration ◽  
Community Support ◽  
Pilot Project ◽  
Field Work ◽  
Digital Data ◽  
Digital Products ◽  
Essential Knowledge ◽  
Surrounding Areas

The Institute of Geology and Mineral Exploration of Greece (I.G.M.E.), in the framework of CSF 2000 – 2006 (Community Support Framework 2000-2006), implemented the pilot project “Collection, Codification and Documentation of geothematic information for urban and suburban areas in Greece - pilot applications”. Geological, geochemical, geophysical, geotechnical, hydrogeological and other geothematic data concerning the urban and surrounding areas of Drama (North Greece), Nafplio & Sparti (Peloponnese) and Thrakomakedones (Attica) were collected. Drillings, geological and neotectonic mapping and other “in situ” measurements and field work took place. All initial and derived analogical and digital data were compiled and processed in specially designed geo-databases in GIS Environment. The final results are presented in geothematic maps and other digital products (DEMs, 2D – 3D surfaces, geodatabases). Such data constitute the essential knowledge base for land use planning and environmental protection in specific urban areas. Through this pilot project, new scientific approaches, methodologies and standards were developed and improved in order to apply to other future projects concerning the major cities of the whole country.

Paleogeography of the Sartan Glaciation of the Hamar-Daban Ridge (Southern Baikal Region)

2020 ◽  
Vol 26 (7) ◽  
pp. 17-32
Author(s):  
F. Enikeev ◽  
Keyword(s):  
Baikal Region ◽  
Lower Boundary ◽  
Google Earth ◽  
Aerial Photographs ◽  
Mountainous Regions ◽  
Mountain Valley ◽  
The Subject ◽  
Remote Identification ◽  
Glacial Landforms ◽  
The Last Glacial

Based on the methods of remote identification and spatial fixation of glacial relief forms with their subsequent geomorphological analysis, the lower boundary of the chionosphere, the glacier feeding areas, boundaries and glacier parameters of the maximum phase of the Last Glacial Maximum glaciers (MIS 2) of the mountainous regions of Southern Baikal region were established and a paleogeographic map was constructed. The object of this study was the dynamics of exogenous processes during the development of the permafrost zone in the Southern Baikal region. The subject of the study is the glacial landforms of the Late Neopleistocene of the Khamar-Daban ridge. Glaciers were reconstructed using absolute marks of destructive and accumulative traces using topographic maps, aerial photographs and satellite images. Paleogeographic constructions were carried out using computer programs Google Earth Pro and SAS. Planet release. The final generalization of the primary material was carried out on a topographic basis on a scale of 1:500,000. The results obtained made it possible to establish the depression of the snow boundary at the maximum of the last cooling at 1300…1400 m in relation to the current climatic and to reveal the features of deformation of the lower border of the chionosphere. The reconstruction of the paleogeographic situation showed the spread of simple and complex (dendritic) types of mountain-valley glaciers, as well as mesh and mountain-glaciation glaciers in some parts of the mountain top. It was established that in the region of the maximum depression of the snowy border, some glaciers reached the coast of Lake Baikal, which could contribute to dilution of secondary aureoles and the displacement of placer mineral deposits. On the southern slope of the Khamar-Daban ridge, the snow boundary passed at an altitude of 1800…2200 m, and glaciation was limited to the development of only circus and circus-valley glaciers of small sizes, contributing to the formation of placers far removed from indigenous sources

scholarly journals Aldegondabreen glacier change since 1910 from structure-from-motion photogrammetry of archived terrestrial and aerial photographs: utility of a historic archive to obtain century-scale Svalbard glacier mass losses

2020 ◽  
pp. 1-10
Author(s):  
Erik Schytt Holmlund
Keyword(s):  
Loss Rate ◽  
Aerial Photographs ◽  
Volume Loss ◽  
Entire Study Period ◽  
Elevation Change ◽  
Entire Study ◽  
Mass Losses ◽  
Elevation Data ◽  
Manual Processing ◽  
Insight Into

Abstract Photogrammetric reconstructions of the Aldegondabreen glacier on Svalbard from 17 archival terrestrial oblique photographs taken in 1910 and 1911 reveal a past volume of 1373.7 ± 78.2 · 106 m3; almost five times greater than its volume in 2016. Comparisons to elevation data obtained from aerial and satellite imagery indicate a relatively unchanging volume loss rate of − 10.1 ± 1.6 · 106 m3 a−1 over the entire study period, while the rate of elevation change is increasing. At this rate of volume loss, the glacier may be almost non-existent within 30 years. If the changes of Aldegondabreen are regionally representative, it suggests that there was considerable ice loss over the entire 1900s for the low elevation glaciers of western Svalbard. The 1910/11 reconstruction was made from a few of the tens of thousands of archival terrestrial photographs from the early 1900s that cover most of Svalbard. Further analysis of this material would give insight into the recent history and future prospects of the archipelago's glaciers. Photogrammetric reconstructions of this kind of material require extensive manual processing to produce good results; for more extensive use of these archival imagery, a better processing workflow would be required.

The 1513 Monte Crenone Rock Avalanche. Numerical model and geomorphological analysis

2020 ◽  
Author(s):  
Alessandro De Pedrini ◽  
Christian Ambrosi ◽  
Cristian Scapozza
Keyword(s):  
Numerical Model ◽  
Mass Movement ◽  
Rock Avalanche ◽  
Digital Data ◽  
Western Slope ◽  
Deposition Zone ◽  
Federal Institute ◽  
Landslide Body ◽  
The Alps ◽  
Movement Simulation

<p>The Monte Crenone rock avalanche of 30 September 1513 is one of the most catastrophic natural events in Switzerland and throughout the Alps. The enormous mass of rock that broke away from the western slope of Pizzo Magn or Monte Crenone, estimated at 50-90 million cubic metres, caused the complete damming of the course of the Brenno river, leading to the formation of a basin that extended from Biasca to the Castello di Serravalle in Semione (De Antoni et al. 2016). On 20 May 1515 the basin formed behind the dam overflowed, giving rise to a wave of more than 10 meters high that led to devastation in the territories downstream to reach Lake Maggiore (Scapozza et al. 2015).</p><p>In this project, we analyze the dynamics of the 1513 rock avalanche, trying to reconstruct the event through a numerical model, calculated with the software RAMMS::Debrisflow (RApid Mass Movement Simulation) provided by the Federal Institute for the Study of Snow and Avalanches (SLF/WSL).</p><p>The realization of the numerical model was preceded by the reconstruction of the topography before the landslide. This first phase of work, included a geological survey of the landslide body, the analysis of digital data (orthophotos, digital topographic maps, shaded model derived from swissALTI3D) and the collection of previous historical data.</p><p>The observation of the stratigraphic data obtained from the 701.27, 701.30 and 701.31 boreholes (part of the geotechnical studies for the Chiasso-San Gottardo highway) of the GESPOS database (GEstione Sondaggi, POzzi e Sorgenti) of the Institute of Earth Sciences SUPSI was essential to understand the landslide body thickness and volume in the deposition zone.</p><p>From the first phase of data collection and interpretation, we then moved on to the actual reconstruction of the digital model of the terrain before the landslide. This operation was carried out using ESRI's ArcGIS software, which made it possible recreating multiple models of the pre-event topography and thus finding the most realistic solution applicable to the subsequent RAMMS model.</p>

Effect of geographic variation and jack pine introgression on disease and insect resistance in lodgepole pine

1996 ◽  
Vol 26 (5) ◽  
pp. 711-726 ◽  
Author(s):  
Harry X. Wu ◽  
Cheng C. Ying ◽  
John A. Muir
Keyword(s):  
British Columbia ◽  
Lodgepole Pine ◽  
Pest Resistance ◽  
Strong Relationship ◽  
Jack Pine ◽  
Yukon Territory ◽  
Geographic Patterns ◽  
Effective Selection ◽  
Pest Incidence ◽  
Natural Range

Incidence of western gall rust (Endocronartiumharknessii (J.P. Moore) Y. Hiratsuka), stalactiform blister rust (Cronartiumcoleosporioides Arth.), needle cast (Lophodermellaconcolor (Dearn.) Darker), and sequoia pitch moth (Synanthedonsequoiae (Hy. Edwards) (Lepidoptera: Sesiidae)) attacks were investigated in a lodgepole pine (Pinuscontorta Dougl. ex Loud, van latifolia Engelm.) provenance–family test plantation located at Red Rock Tree Improvement Station, Prince George, British Columbia. This plantation contains 778 wind-pollinated families from 53 provenances in British Columbia, Alberta, and the Yukon Territory. Pest incidence was assessed in 1993 when the plantation was 21 years old. Provenance had a significant effect on resistance to the four disease and insect attacks. Regression models using latitude, longitude, and elevation as predictors accounted for 38% to 80% of the provenance variation in pest incidence. Geographic patterns of genetic variation in pest resistance essentially followed longitudinal and elevational clines. The most interesting finding is the strong relationship between pest incidence and provenance distance to the western limit of the natural range of jack pine (Pinusbanksiana Lamb,): the closer a lodgepole pine provenance is to the edge of jack pine distribution, the higher is its resistance to the pests. We hypothesize that jack pine introgression may have played a significant role in the evolution of pest defense in lodgepole pine. Effective selection and breeding for pest resistance in lodgepole pine may have to look beyond the intraspecific gene pool.

Integrated Flying Aid and Mission Displays for Modern Combat Aircraft Incorporating a Digital Data Base

1988 ◽  
Vol 41 (02) ◽  
pp. 261-275
Author(s):  
A. M. Whitehead ◽  
W. P. Thomas ◽  
M. P. Wilkins
Keyword(s):  
Data Base ◽  
Situation Awareness ◽  
Night Vision ◽  
Digital Data ◽  
Digital Map ◽  
Electro Optic ◽  
Combat Aircraft ◽  
Infra Red ◽  
Elevation Data ◽  
The Status

Electro-optic sensors – forward-looking infra-red and night vision goggles – are today providing a dramatic enhancement of low-level operational capability, but causing increased demands for precision navigation, situation awareness and advanced displays. Digital map displays, also available today, offer the flexibility of map presentation that is needed. In the future, terrain-referenced systems incorporating digital data bases hold the promise of the integrated flying aid and mission displays that are required for ‘all-weather’ operations. This paper describes first the fit and usage of the EO systems likely in a future combat aircraft and goes on to review the status of data-base systems. It establishes the baseline against which digital map systems and later terrain-referenced displays that exploit an elevation data base might be integrated into the aircraft.

Applications of digital methodology to the NATMAP Shield Margin Project

1999 ◽  
Vol 36 (2) ◽  
pp. 161-173 ◽  
Author(s):  
H John Broome ◽  
David Viljoen
Keyword(s):  
Three Dimensional ◽  
Geological Mapping ◽  
Digital Data ◽  
Data Sets ◽  
Digital Products ◽  
Seismic Reflection Data ◽  
Cd Rom ◽  
Reflection Data ◽  
Mapping Process ◽  
Rectangular Area

The NATMAP Shield Margin Project, which began in 1991, straddles the Manitoba-Saskatchewan border and studied a rectangular area with east-west and north-south extents of approximately 250 and 150 km, respectively. Among the principal objectives of the NATMAP program were a compilation of a digital geoscience database for the study area and development of digital methodology to build this database and its utilization to aid in reaching the geological goals of the project. It was anticipated that these initiatives would encourage integrated interpretation of data, improve the effectiveness of the geological mapping process, and accelerate publication of results. One of the keys to effectively applying digital methods to a geological mapping project is maintaining data in digital form throughout the project, from the field through to publication. Transcription errors are eliminated and the production of both preliminary and final maps and digital products is accelerated. Access to digital data also facilitates application of digital tools for analysis and visualization. Integrated image products generated from geophysical and geological data sets were used throughout the project and assisted in development of geological models and their visualization. Three-dimensional visualization methods were used to combine NATMAP surface and subsurface mapping with Lithoprobe interpretations of seismic reflection data. The digital database was used to prepare a digital archive of the project which will be published in CD-ROM after completion of the project.

scholarly journals DEMNAS: MODEL DIGITAL KETINGGIAN NASIONAL UNTUK APLIKASI KEPESISIRAN

OSEANA ◽  
2018 ◽  
Vol 43 (4) ◽  
Author(s):  
Marindah Yulia Iswari ◽  
Kasih Anggraini
Keyword(s):  
Remote Sensing ◽  
Digital Elevation Model ◽  
Spatial Resolution ◽  
Digital Data ◽  
Coastal Hazards ◽  
Remote Sensing Images ◽  
Geospatial Information ◽  
Digital Elevation ◽  
Elevation Data ◽  
Elevation Model

DEMNAS : NATIONAL DIGITAL ELEVATION MODEL FOR COASTAL APPLICATION. DEM is a digital data which contain information about elevation. In Indonesia, DEM can be generated from elevation points or contours in RBI (Rupabumi Indonesia). DEM can be performed to research of coastal application i.e. inundation or tsunami. DEM can help to analyze vulnerability or evacuation zone for coastal hazards. DEMNAS is one product of BIG (Geospatial Information Agency) which consist of elevation data from remote sensing images. DEMNAS data has not been widely used and is still being developed but DEMNAS has an advantage of spatial resolution. DEMNAS has spatial resolution 0.27 arc-second, which is bigger than the spatial resolution of global DEM.

scholarly journals Digital Entrepreneurship vis-à-vis Managing Customers’ Data: Available Ways & Means to Protect the Online Presence of the Businesses

2019 ◽  
Vol 6 (3) ◽  
pp. 25
Author(s):  
Sunil Sharma
Keyword(s):  
Daily Basis ◽  
Financial Information ◽  
Digital Data ◽  
Specific Information ◽  
Digital Products ◽  
Online Presence ◽  
Massive Scale ◽  
Financial Losses ◽  
Digital Entrepreneurship

<p class="normal">The modern day businesses are having an inevitable online presence to ensure to grab every possible opportunity to do business. Even the businesses who do transact purely offline are also having their online presence by having their business websites. And those businesses which have an entire gamut of their services or digital products to offer only via online channels have to ensure near to perfect online set-ups to stay in the businesses. Online businesses receive thousands of gigabytes of data from their users or customers on a daily basis altogether. This data contains specific information about the geographics of the users, their financial information, KYCs, their investment and other key profile based data. What will happen if that enormous data lands in the hands of some unscrupulous people? The user and customers' data will get compromised affecting them negatively. Many of the users may incur financial losses due to that mishandling of digital data. And last but not the least, the digital businesses will have all the possible dents of bad reputation leading to even boycott of their businesses by the users on a massive scale. All this is sufficient to shatter the dreams of the digital entrepreneurship. This paper seeks to point out how the digital entrepreneurs can better identify key data of their users and customers, how they can keep safe custody of that data and how to manage and protect the confidentiality of the users and customers.</p>

scholarly journals The Utilization of Black – White Panchromatic Aerial Photograph for Mass Movement Study in Karang Kobar Areas, Banjarnegara, Centra Java

2004 ◽  
Vol 11 (2) ◽  
Author(s):  
Imam Hardjono ◽  
Karmono Mangoensoekardjo ◽  
S Sutikno
Keyword(s):  
Remote Sensing ◽  
Physical Environment ◽  
Aerial Photograph ◽  
Mass Movement ◽  
Geological Structure ◽  
Aerial Photographs ◽  
Visual Interpretation ◽  
Mass Wasting ◽  
Quality Of Data ◽  
Central Java

This is the result of applied remote sensing  for geological study the mass wasting in Karangkobar, the district of Banjarnegara, Central Java. The study on the mass wasting use the remote sensing method, by interpreting the blackwhite panhromatic aerial photographs, on the scale 1 : 50,000. The study is aimed at 1) revealing the capacity of the aerial photograph in supporting the study the mass wasting that an be identified by the aerial photographs; 2) to find out the influence of the physical environment and land-use on the mass wasting processes. The study in performed by using the visual interpretation method of the scale 1 : 50,000 black-white panchromati aerial photograph taken in 1994, using mirror stereoscope. The outcome of the aerial photograph interpretation is varis the quality of data and information. The data of interpretation of aerial photograph and the varis outcome in the spot are further tested in terms of its accuracy, particularly in its reltion with the aerial photograph interpretation. The technique of data analysis of the physical environment and the mass wasting is descriptive – comparative. The result of the study shows that the 1 : 50,000 black-white panchromatic aerial photograph can be used to identify and study both the mass wasting and influence of the physical environment on the mass wasting processes. The degree of identifying the mass wasting based on the aerial photograph interpretation is 75%. Compared to the previous studies, the present study hows that the mass wasting can be identified more easily by means of the 1 : 50,000 black – white panchromatic aerial photograph. Identifying the distribution of mass wasting are: a) the geological element (rock, geological structure, and stratigraphy); b) geomorphological elements (landform and the forming processes); the water condition (surface water and groundwater); and landuse (type and distribution). White marl – claystone type is the physical environmentsal element that has the most type is the physical environmentsal element that has the most dominant influence on the occuring of mass wasting in Karangkobar area.

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