Using mathematical algorithms for classification of LANDSAT 8 satellite images

Herbei, Mihai Valentin; Sala, F.; Boldea, Marius

doi:10.1063/1.4912899

Cited by 16 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The supervised classification workflow involves selecting training pixels for each class and extracting their spectral signatures. Then, each pixel in the image is assigned to a class based on their spectral similarities and a classification algorithm (Campbell and Wynne, 2011;Herbei et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

Mapping Hydrothermal Alteration at the Fentale-Dofan Magmatic Segment of the Main Ethiopian Rift

2021

View full text Add to dashboard Cite

The Main Ethiopian Rift (MER) is characterized by extensional tectonics and volcanism, associated with active hydrothermal systems, hydrothermal alteration and fumarolic deposits. The spatial distribution of these hydrothermal products and their link with faults and rock types provides important clues to what controls fluid flow in the subsurface. However, little is known about this in the East African Rift. We address this issue with a multidisciplinary approach in the Fentale-Dofan magmatic segment of the MER, an area characterized by intense volcanic and tectonic activity and a geothermal prospect. Primarily we conduct mapping of hydrothermal alteration and fumarolic deposits, and rock lithologies using a surface feature classification technique of multispectral satellite images. Then we interpret the map using a new database of faults and active hydrothermal manifestations such as hot-springs and fumaroles. We find that the surface hydrothermal alteration and deposits are mainly focused near Fentale and the Dofan Volcanic Complex (DVC). At DVC the hydrothermal products are focused on rhyolites on the western side of the volcano, in an area of intense NNE striking, rift parallel faults. At Fentale volcano the hydrothermal products are mainly associated with ignimbrite and show a circular pattern around the volcanic edifice, but also in places follow the NNE striking faults. At Fentale, the more complex association of hydrothermal products and active manifestations around the edge of the ignimbrite suggests formation contacts may also localize fluid flow in places. At both volcanoes the association between hydrothermal products with either the rhyolites and ignimbrites is likely due to them being relatively easily altered (in comparison to basalt), and also their brittle nature allows for fracturing through which localized fluid flow can occur (as opposed to the sediments). The general pattern of hydrothermal products suggests a stronger structural influence at the DVC with respect to Fentale. The presence of hydrothermal products and active hydrothermal manifestations, along with other lines of evidence such as locus of subsurface dike intrusion at the volcanic centres, suggest that discrete and localized magma reservoirs beneath Fentale and the DVC are the heat source for hydrothermal circulation. Our study also demonstrates that geology, including hydrothermal deposits, can be successfully mapped using automated remote sensing based classification.

show abstract

Section: Methodsmentioning

confidence: 99%

Mapping Hydrothermal Alteration at the Fentale-Dofan Magmatic Segment of the Main Ethiopian Rift

2021

View full text Add to dashboard Cite

show abstract

“…The data was generated from multispectral LandsatOLI8 imagery (LC08L1TP_195026_201700312 and LC08L1TP_195027_201700312; spectral bands [μm]: red [ch4]: 0.630–0.680; NIR [near infrared, ch5]: 0.845–0.885 [Barsi, Lee, Kvaran, Markham, & Pedelty, ]). The images were merged, recalculated and converted to a false‐color image to distinguish agricultural land from forest stands and open meadows (Herbei, Sala, & Boldea, ). In this context, so‐called vegetation indices (NDVI, normalized difference vegetation index) were produced by recalculating the spectral channels.…”

Section: Methodsmentioning

confidence: 99%

Paradigm and pragmatism: GIS‐based spatial analyses of Roman infrastructure networks and land‐use concepts in the Upper Rhine Valley

Kempf

2019

Geoarchaeology

View full text Add to dashboard Cite

The Roman infrastructural network in the Upper Rhine Valley aligns with the locations of military fortifications and also connects agricultural areas and settlements to trade routes and regional markets. Conventionally, the connection of rural areas to these broader networks is imagined as a straight line, suggesting direct connectivity, maximum accessibility, and engineering pragmatism. However, it is important to appreciate that local environmental conditions had a strong impact on Roman road development and land-use strategies. This article examines the geomorphological, geological, and hydrogeological conditions in the Upper RhineValley to define and analyze the relationships between Roman transport routes, settlement, and land-use opportunities, and physical-geographical factors. An accumulative cost surface is generated using vegetation data based on satellite imagery, and attributes are recorded in geomorphological and geological maps in a GIS. This modeling technique leads to potential movement and infrastructure corridors. Topographical aspects and terrain roughness play only a minor role in the study area, and it is argued that the interplay of aquifer thickness, groundwater level, quaternary sedimentology, and soil communities is decisive for assessing the suitability of terrain for corridors of movement.

show abstract

“…In the self-regulation of the geo-systems, it is exactly the biota that plays a great role, because it is the most important stabilizing factor of the territory. Due to its mobility and wide adaptability to the abiotic factors, the capability of recovering and creating an internal environment with specific regimes -light, thermal, water, and mineral -a certain degree of the landscape's sustainability is formed (Herbei et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

Relative Sustainability of the Altai Transborder Ecosystems

Zhuravleva¹,

Sukhova²,

Karanin³

et al. 2018

PTQ

View full text Add to dashboard Cite

Mountainous natural complexes of Altai cross-border territory is a unique object of studies into their durability against an external impact since they represent a complex mosaic structure. Authors used an integral characteristic as an assessment factor, which allowed to determine the durability of their soil cover. First, the river layer was converted into the scanning pattern. Next, all characteristics were translated into relative values, During the research, it was established that those ecosystems that formed on terrain consisting of steep slopes were more susceptible to adverse natural phenomena. It was discovered that the landscape is an optimal unit for determining the durability of ecosystems. The article provides results of an integral assessment of the degree of ecosystem’s ecological durability against an external impact.

show abstract

Using mathematical algorithms for classification of LANDSAT 8 satellite images

Cited by 16 publications

References 4 publications

Mapping Hydrothermal Alteration at the Fentale-Dofan Magmatic Segment of the Main Ethiopian Rift

Mapping Hydrothermal Alteration at the Fentale-Dofan Magmatic Segment of the Main Ethiopian Rift

Paradigm and pragmatism: GIS‐based spatial analyses of Roman infrastructure networks and land‐use concepts in the Upper Rhine Valley

Relative Sustainability of the Altai Transborder Ecosystems

Contact Info

Product

Resources

About