Digital false colour aerial photographs for discrimination of aquatic macrophyte species

Valta-Hulkkonen, Kirsi; Tanskanen, Heikki; Ustinov, Arto; Sandman, Olavi

doi:10.1016/s0304-3770(02)00166-3

Cited by 24 publications

(12 citation statements)

References 20 publications

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“…Although most airphoto analyses rely on visual interpretation, plant species can be often discriminated due to its high spatial resolution (Moore et al 2003;Schulz et al 2003). Digitization of aerial photography may allow the application of computer aided classification algorithms (Valta-Hullkonen et al 2003;Marshall and Lee 1994). Aerial photography, however, often lacks the capacity to record in multiple spectral bands, a hindrance especially significant for submerged vegetation.…”

Section: Spectral Behavior Of Emergent Speciesmentioning

confidence: 99%

“…Considering both airborne and orbital imaging sensors, accuracies ranging between 70 and 96% can be achieved (Pasqualini et al 2005;Sawaya et al 2003;Valta-Hullkonen et al 2003;Anstee 2001;Everitt et al 1999;Malthus and George 1997;Bajjouk et al 1996). High overall accuracy can be obtained with the correct choice and application of mapping techniques.…”

Section: Spectral Behavior Of Emergent Speciesmentioning

confidence: 99%

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Remote sensing of aquatic vegetation: theory and applications

Silva

Costa

Mélack

et al. 2007

Environ Monit Assess

275

189

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Aquatic vegetation is an important component of wetland and coastal ecosystems, playing a key role in the ecological functions of these environments. Surveys of macrophyte communities are commonly hindered by logistic problems, and remote sensing represents a powerful alternative, allowing comprehensive assessment and monitoring. Also, many vegetation characteristics can be estimated from reflectance measurements, such as species composition, vegetation structure, biomass, and plant physiological parameters. However, proper use of these methods requires an understanding of the physical processes behind the interaction between electromagnetic radiation and vegetation, and remote sensing of aquatic plants have some particular difficulties that have to be properly addressed in order to obtain successful results. The present paper reviews the theoretical background and possible applications of remote sensing techniques to the study of aquatic vegetation.

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Section: Spectral Behavior Of Emergent Speciesmentioning

confidence: 99%

Section: Spectral Behavior Of Emergent Speciesmentioning

confidence: 99%

Remote sensing of aquatic vegetation: theory and applications

Silva

Costa

Mélack

et al. 2007

Environ Monit Assess

275

189

View full text Add to dashboard Cite

show abstract

“…The nomenclature of the lake ecosystem classes was based on the growth forms of aquatic macrophytes (cf. Valta-Hulkkonen et al, 2003), and the categories of the buffer zone followed the CORINE land cover classification (Heymann et al, 1994;Bossard et al, 2000; Table 1). …”

Section: Land Cover Data Processing and Landscape Analysismentioning

confidence: 99%

Spatio-temporal changes in land cover and aquatic macrophytes of the Danube floodplain lake

et al. 2011

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a b s t r a c tThe aquatic vegetation ofČíčov Lake in the Danube floodplain, which is listed in the Ramsar Convention, was investigated to address three main questions: (1) how have landscape composition and the structures of the lake and its buffer zone changed from the mid-20th century;(2) how have species richness and the abundance of the aquatic macrophyte assemblage in this lake ecosystem changed over the last 34 years; and (3) which landscape metrics can best explain these temporal changes for floating-leaved macrophytes? Two methodological approaches, remote sensing and botanical field surveys, were applied. Historical (1949, 1970, 1990) and contemporary (2006) aerial photographs were analysed to determine land cover. Landscape configuration and structure were analysed using eight landscape metrics selected in advance to measure spatio-temporal changes and the fragmentation of the lake ecosystem and its corresponding buffer zone. The species diversity, abundance and distribution of true aquatic macrophytes were surveyed eleven times in five survey stretches between 1973 and 2007.At the landscape level, a decrease in the area covered by floating-leaved macrophytes, as well as an increase in open water surface and fragmentation of the land cover classes in the lake ecosystem, were recorded from 1949 to 2006. Overall, 30 true aquatic macrophytes were found from 1973 to 2007. Species richness did not change considerably, but the abundance of aquatic species fluctuated over the years. Three groups of true aquatic vegetation, based on common structural characteristics, were found in 1973-1983, 1989-2002, and 2004-2007 over the last 34 years. The landscape metrics NP, PD, LPI, and SHDI, which all express patterns of landscape fragmentation mostly indicate temporal changes in floatingleaved macrophytes.

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“…Knowledge of the past status of a lake can provide insight into the chances of restoration or rehabilitation work being successful. Since quantitative ground investigations on the scale of a whole lake are laborious, remote sensing methods are increasingly being used for mapping aquatic vegetation and estimating their distribution and biomass (Lehmann et al 1993, Lehmann and Lachavanne 1997, Valta-Hulkkonen et al 2003a.…”

Section: Introductionmentioning

confidence: 99%

Remote sensing and GIS for detecting changes in the aquatic vegetation of a rehabilitated lake

Valta-Hulkkonen

Kanninen²

2004

International Journal of Remote Sensing

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Remote sensing and geographical information system (GIS) methods combined with ground estimations were used to assess the effects of rehabilitation on the aquatic vegetation of a shallow, eutrophic lake in Finland. Aerial photograph interpretation was used to study the distribution of aquatic vegetation before (1953, 1996) and after (2001) rehabilitation in 1997. A digital elevation model was derived to relate the change in the aquatic vegetation to water depth. In addition, changes in the biomass of the most abundant species of the lake, Common Club-rush (Schoenoplectus lacustris), were studied by means of a regression analysis relating the ground estimations to the reflectance values (R 2~0 .889, pv0.001). The results indicated that the objective of the rehabilitation-to stop the overgrowth process-has at least temporarily been achieved. After rehabilitation the most noticeable change had taken place in the area covered by floating-leaved vegetation. Greater proportional changes in the aquatic vegetation areas had occurred in the deep rather than in the shallow areas. A decrease in biomass of Common Club-rush was estimated to be 30% due to rehabilitation. The use of remote sensing and GIS provided valuable information on temporal and spatial changes in the aquatic vegetation, and the methods could be applied more extensively for lake monitoring purposes.

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Digital false colour aerial photographs for discrimination of aquatic macrophyte species

Cited by 24 publications

References 20 publications

Remote sensing of aquatic vegetation: theory and applications

Remote sensing of aquatic vegetation: theory and applications

Spatio-temporal changes in land cover and aquatic macrophytes of the Danube floodplain lake

Remote sensing and GIS for detecting changes in the aquatic vegetation of a rehabilitated lake

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