Comparison of multisource image fusion methods and land cover classification

Amarsaikhan, D.; Saandar, M.; Ganzorig, M.; Blotevogel, Hans Heinrich; Egshiglen, E.; Gantuyal, R.; Nergui, B.; Enkhjargal, D.

doi:10.1080/01431161.2011.616552

Cited by 61 publications

(29 citation statements)

References 28 publications

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“…Most available high spectral resolution sensors acquire data with a relatively coarse spatial resolution, limiting their applications in areas where vegetation appears in small patches (Zhang 2015). Image fusion combines images from different platforms with minimal loss of the original data, potentially providing a balance between temporal, spectral, and spatial resolution for image classification (Amarsaikhan et al 2011;Zhang 2010). Additionally, the use of unmanned aerial systems could deliver very high-resolution imagery for monitoring native invasives.…”

Section: Discussionmentioning

confidence: 99%

Quantifying the spatial and temporal distribution of tanglehead (Heteropogon contortus) on South Texas rangelands

et al. 2018

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Introduction: Tanglehead is a grass native to southwestern US rangelands; however, its prevalence as a native invasive on South Texas rangelands has increased rapidly during the last decade. Large areas of monotypic stands have emerged in Jim Hogg, Duval, Brooks, and Kleberg counties. The aim of this research is to understand the spatial and temporal dynamics of these invasions as a model for the assessment of native invasive species. Our specific objectives were to (1) evaluate the feasibility of classifying tanglehead using 1-m resolution imagery data, (2) assess the spatial and temporal distribution of tanglehead in relation to soil type and distance from roads, and (3) quantify the temporal and spatial distribution of tanglehead on our study sites. We combined remote sensing approaches with landscape metrics to quantify the spatial and temporal distribution of tanglehead in five locations across our study area. We calculated the normalized difference vegetation index and combined it with the original aerial imagery to conduct an unsupervised classification with the following land cover classes: woody vegetation, tanglehead, non-tanglehead herbaceous, and bare ground. Soil type and the distance from roads were assessed to determine the relationship between these factors and tanglehead spatial distribution. Results: We were able to successfully map tanglehead using the 1-m imagery. Our image classification approach resulted in accuracies greater than 85% for all sites. Tanglehead occurred in sandy, loamy sand, and sandy loam soils. Over 70% of tanglehead cover occurred within the first 150 m from the edge of roads. This cover increased from 7.1% (SE = 1.1%) in 2008 to 17.8% (SE = 5.4%) in 2014. Once established, small patches of tanglehead began aggregating or coalescing with existing stands, thereby creating larger patches over larger areas. Conclusions: Our study has shown the value of analyzing spatiotemporal dynamics of tanglehead with remote sensing techniques and landscape metrics to improve our understanding of establishment and dispersal processes of a native invasive. This study provides useful information to improve rangeland management decisions as well as assessing native invasive dynamics with potential applications for assessing its effects on wildlife habitat, livestock operations, and habitat restoration strategies.

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Section: Discussionmentioning

confidence: 99%

Quantifying the spatial and temporal distribution of tanglehead (Heteropogon contortus) on South Texas rangelands

et al. 2018

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“…Very often a high resolution panchromatic image is integrated with a low resolution multispectral image thus improving interpretation and analysis of the natural and man-made objects. In other words, the image fusion is the integration of different digital images in order to create a new image and obtain more information than can be separately derived from any of them [9,20,21]. In the present study, for the urban areas, the SAR image provides structural information about buildings and street alignment due to the double bounce effect, while the optical image provides the information about the spectral variations of different urban features.…”

Section: Image Fusionmentioning

confidence: 99%

“…It is clear that the combined application of optical and SAR data setscan provide unique information for different thematic studies, because passive sensor images will represent spectral variations of various surface features, whereas microwave data with their penetrating capabilities can provide some additional information. For example, in urban environment the optical images provide the information about the spectral variations of the different urban features, whereas the radar images provide structural information about buildings and street alignment owing to the double bounce scattering [9].…”

Section: Introductionmentioning

confidence: 99%

Advanced Classification of Lands at TM and Envisat Images of Mongolia

Vandansambuu

Amarsaikhan²,

Bat-Erdene³

et al. 2013

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The aim of this study is to fuse high resolution optical and microwave images and classify urban land cover types using a refined Mahalanobis distance classifier. For the data fusion, multiplicative method, Brovey transform, intensity-huesaturation method and principal component analysis are used and the results are compared. The refined method uses spatial thresholds defined from local knowledge and the bands defined from multiple sources. The result of the refined Mahalanobis distance method is compared with the result of a standard technique and it demonstrates a higher accuracy. Overall, the research indicates that the combined use of optical and microwave images can notably improve the interpretation and classification of land cover types and the refined Mahalanobis classification is a powerful tool to increase classification accuracy.

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“…Image fusion techniques utilizing SAR and multispectral data sources can significantly improve the interpretation and classification of land cover based maps (PAUL et al 2002;HABOUDANE et al 2002;KÄÄB 2005;AMARSAIKHAN et al 2011).…”

Section: Geospatial Techniques To Detect Debris Covered Glaciers and mentioning

confidence: 99%

Water resources in Chile: The critical relation between glaciers and mining for sustainable water management

2013

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Rock glaciers and debris covered glaciers are often understudied in comparison to their uncovered glacial counterparts (in which stunning surface ice is clearly visible). However, rock glaciers and debris covered glaciers are more abundant, often cover a larger area, and will continue to supply a water resource once other glaciers have melted. The surface rock and weathered material cover on rock glaciers and debris covered glaciers acts as an insulator to protect internal ice. As a result, they maintain a reservoir of ice that will be released as water as the climate warms. In the Central Andes (31°-35° S), these catchments provide a valuable water source for nearby urban areas such as Santiago, Chile, which supports more than 6 million people. They also provide irrigation water for agriculture, supporting the burgeoning wine industry in Chile. However, rock glacier and debris covered glaciers are often misinterpreted as other landforms, and their water source is unrecognized by many. The objective of this research is to provide a methodology to inventory the extent of debris covered and rock glaciers in a catchment to estimate the amount of water contained within these landforms using GIS and remotely sensed data. This methodology could be used to better assess and sustainably manage the water resources in the Dry Andes in general and in the Aconcagua Basin in particular.Keywords: Glaciers, debris covered glaciers, rock glaciers, mining expansion, sustainable water management.Recursos hídricos en Chile: La relación crítica entre los glaciares y la minería para el manejo sustentable del agua RESUMEN Los glaciares de roca y los glaciares con cubierta detrítica son a menudo poco estudiados en comparación con sus homólogos los glaciares descubiertos o blancos (en que la impresionante superficie de hielo es claramente visible). Sin embargo, los glaciares de roca y los glaciares con cubierta detrítica son más abundantes, a menudo cubren un área más extensa, y continuarán suministrando una fuente de agua una vez que los glaciares blancos se hayan derretido. La superficie de roca y de material degradado que cubre los glaciares de roca y con cubierta detrítica actúa como un aislante térmico que protege el hielo interno. Como resultado de ello, éstos mantienen una reserva de hielo que se fusiona lentamente mientras el clima se calienta. En los Andes Centrales (31°-35° S), estas cuencas son una valiosa fuente de agua para las cercanas zonas urbanas, como Santiago de Chile, que sostiene a más de 6 millones de personas. También proporcionan agua de riego para la agricultura y apoyan a la próspera industria del vino en Chile. Sin embargo, los glaciares de roca y con cubierta detrítica son a menudo mal interpretados como otras geoformas, y su fuente de agua no es reconocida por muchos. El objetivo de este trabajo es proporcionar una metodología para inventariar la extensión de los glaciares de roca y con cubierta detrítica para estimar la cantidad de agua contenida dentro de éstos mediante el uso de los SIG y teledet...

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Comparison of multisource image fusion methods and land cover classification

Cited by 61 publications

References 28 publications

Quantifying the spatial and temporal distribution of tanglehead (Heteropogon contortus) on South Texas rangelands

Quantifying the spatial and temporal distribution of tanglehead (Heteropogon contortus) on South Texas rangelands

Advanced Classification of Lands at TM and Envisat Images of Mongolia

Water resources in Chile: The critical relation between glaciers and mining for sustainable water management

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