FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3031920906> ?p ?o ?g. }

• W3031920906 abstract "Low spatial resolution thermal data from the Advanced Very High Resolution Radiometer (AVHRR) have been available for any cloud-free sub-aerial volcano at least 4times a day since 1979. Although extensively used to monitor ash plumes injected into the atmosphere by volcanic eruptions, this cheap, directly and regularly available data source has never been thoroughly examined to determine its utility for real-time monitoring of high temperature volcanic activity occurring at the surface. This thesis is therefore concerned with developing techniques to locate, measure and monitor high temperature volcanic phenomena in AVHRR data. To locate high temperature phenomena, I develop an automated thresholding algorithm which roams an image flagging thermal anomalies. The major advantage of this technique over existing thresholding techniques developed for fires is that it requires no manual input. By running the algorithm on 90 images acquired during the 1991 to 1993effusive eruption at Mount Etna, pixels containing active lava or high temperature open vents were located, with the program completing within 1 second. This permitted lava flow location to within ±1 km of known topographic features, roads and towns. The flexibility of the thresholding algorithm to detect other high temperature sources, over a variety of regions and seasons, was demonstrated by applying the algorithm to images containing wild-fires burning along the east coast of Australia during January 1994. For quantitative analysis, I develop a new approach capable of estimating the size and temperature of at least three sub-pixel thermal components. This approach enables lava flow area and thermal flux to be constrained more accurately than is possible using established techniques which allow measurement of just two thermal components. Using the area and thermal flux results, I refine an algorithm to estimate lava effusion rates. This in turn allows calculation of lava flow field cumulative and total volumes. Application to data for effusive activity at Etna during 1985 and between 1991 and 1993 gives mean effusion rates of I also present simple approaches which use spectral radiance from the volcanicsource to monitor volcanic activity through time and to distinguish between different types of volcanic phenomena. At Stromboli, troughs and peaks in a spectral radiance time-series respectively correlate with periods normal explosive activity and less frequent effusive events. A scatter plot of spectral radiances from the volcanic source acquired in two thermal wavebands, one in the mid-infrared and one in the thermal infrared, allows lava lakes, flows and open vents to be distinguished according to their position in the scatter. I use a number of case studies, drawn from effusive activity at Etna, Krafla, Togo, Cerro Negro and Erebus, as well as pyroclastic and degassing activity at Lascar, Vulcano, Etna and Stromboli, to show how AVHRR can be used to measure and monitor high temperature volcanic phenomena. If data analysis were carried out on reception, regular location and monitoring of on-going effusive eruptions, as well as persistent high temperature phenomena, would be possible." @default.
• W3031920906 created "2020-06-05" @default.
• W3031920906 creator A5013970453 @default.
• W3031920906 date "1996-09-03" @default.
• W3031920906 modified "2023-09-22" @default.
• W3031920906 title "Low spatial resolution thermal monitoring of volcanoes from space" @default.
• W3031920906 hasPublicationYear "1996" @default.
• W3031920906 type Work @default.
• W3031920906 sameAs 3031920906 @default.
• W3031920906 citedByCount "4" @default.
• W3031920906 crossrefType "dissertation" @default.
• W3031920906 hasAuthorship W3031920906A5013970453 @default.
• W3031920906 hasConcept C113754120 @default.
• W3031920906 hasConcept C115961682 @default.
• W3031920906 hasConcept C120806208 @default.
• W3031920906 hasConcept C127313418 @default.
• W3031920906 hasConcept C127413603 @default.
• W3031920906 hasConcept C146978453 @default.
• W3031920906 hasConcept C153294291 @default.
• W3031920906 hasConcept C154945302 @default.
• W3031920906 hasConcept C160633673 @default.
• W3031920906 hasConcept C161840515 @default.
• W3031920906 hasConcept C165205528 @default.
• W3031920906 hasConcept C191178318 @default.
• W3031920906 hasConcept C19269812 @default.
• W3031920906 hasConcept C205372480 @default.
• W3031920906 hasConcept C205649164 @default.
• W3031920906 hasConcept C2777480484 @default.
• W3031920906 hasConcept C2777548347 @default.
• W3031920906 hasConcept C41008148 @default.
• W3031920906 hasConcept C58640448 @default.
• W3031920906 hasConcept C62649853 @default.
• W3031920906 hasConceptScore W3031920906C113754120 @default.
• W3031920906 hasConceptScore W3031920906C115961682 @default.
• W3031920906 hasConceptScore W3031920906C120806208 @default.
• W3031920906 hasConceptScore W3031920906C127313418 @default.
• W3031920906 hasConceptScore W3031920906C127413603 @default.
• W3031920906 hasConceptScore W3031920906C146978453 @default.
• W3031920906 hasConceptScore W3031920906C153294291 @default.
• W3031920906 hasConceptScore W3031920906C154945302 @default.
• W3031920906 hasConceptScore W3031920906C160633673 @default.
• W3031920906 hasConceptScore W3031920906C161840515 @default.
• W3031920906 hasConceptScore W3031920906C165205528 @default.
• W3031920906 hasConceptScore W3031920906C191178318 @default.
• W3031920906 hasConceptScore W3031920906C19269812 @default.
• W3031920906 hasConceptScore W3031920906C205372480 @default.
• W3031920906 hasConceptScore W3031920906C205649164 @default.
• W3031920906 hasConceptScore W3031920906C2777480484 @default.
• W3031920906 hasConceptScore W3031920906C2777548347 @default.
• W3031920906 hasConceptScore W3031920906C41008148 @default.
• W3031920906 hasConceptScore W3031920906C58640448 @default.
• W3031920906 hasConceptScore W3031920906C62649853 @default.
• W3031920906 hasLocation W30319209061 @default.
• W3031920906 hasOpenAccess W3031920906 @default.
• W3031920906 hasPrimaryLocation W30319209061 @default.
• W3031920906 hasRelatedWork W1969119068 @default.
• W3031920906 hasRelatedWork W1969709562 @default.
• W3031920906 hasRelatedWork W1973899605 @default.
• W3031920906 hasRelatedWork W1994662209 @default.
• W3031920906 hasRelatedWork W2028704841 @default.
• W3031920906 hasRelatedWork W2047530874 @default.
• W3031920906 hasRelatedWork W2048361729 @default.
• W3031920906 hasRelatedWork W2055057957 @default.
• W3031920906 hasRelatedWork W2083073290 @default.
• W3031920906 hasRelatedWork W2087060899 @default.
• W3031920906 hasRelatedWork W2108031910 @default.
• W3031920906 hasRelatedWork W2131180775 @default.
• W3031920906 hasRelatedWork W2159237407 @default.
• W3031920906 hasRelatedWork W2162244958 @default.
• W3031920906 hasRelatedWork W2208146029 @default.
• W3031920906 hasRelatedWork W2806066784 @default.
• W3031920906 hasRelatedWork W3014540110 @default.
• W3031920906 hasRelatedWork W3025918768 @default.
• W3031920906 hasRelatedWork W3108621455 @default.
• W3031920906 hasRelatedWork W784805306 @default.
• W3031920906 isParatext "false" @default.
• W3031920906 isRetracted "false" @default.
• W3031920906 magId "3031920906" @default.
• W3031920906 workType "dissertation" @default.