Vegetation change detection of mires with digital aerial photographs

Cserhalmi, Dániel; Kristóf, Dániel

doi:10.1556/crc.35.2007.2.41

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…Even though object based methods (such as image segmentation) play a greater role in vegetation science, simple pixel based classification methods still have a considerable importance. For panchromatic aerial photos, these latter methods can only be used when a relatively small number of categories are separated (Cserhalmi and Kristóf, 2007). At the same time, it is possible to separate habitats with different texture, e.g.…”

Section: Aerial Photographs Image Interpretation Accuracy Assessmentmentioning

confidence: 99%

Shrub Encroachment in a Wooded-Steppe Mosaic: Combining Gis Methods With Landscape Historical Analysis

Erdős¹

2013

Appl Ecol Env Res

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Shrub encroachment at the expense of grasslands is a world-wide phenomenon, which has considerable nature conservation consequences. On the southern slope of Mt Szársomlyó, one of Hungary's most unique nature reserves, shrubforest cover has been rapidly increasing in the past few decades. Our aim was to quantify this process and to give a comprehensive analysis of the landscape history of the area. Moreover, we compared Mt Szársomlyó to two nearby and similar mountains with a slightly different land-use history. It is almost certain that both shrubforests and grasslands were present on Mt Szársomlyó before human influence, although their original proportion is unknown. Southern slope was used as a pasture for centuries, maybe even for millennia. After grazing had come to an end during the 1970's, shrubforests began to expand rapidly: their cover increased from 9.83 % in 1964 to 21.7 % in 2005. In the case of the other two mountains, where grazing stopped earlier, forest cover is considerably higher than on Mt Szársomlyó, but this is partly due to the afforestation. It can be concluded that grazing of south-exposed rock swards should be regarded as a traditional land-use in the region. Further studies are needed to support nature conservation decisions.

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Section: Aerial Photographs Image Interpretation Accuracy Assessmentmentioning

confidence: 99%

Shrub Encroachment in a Wooded-Steppe Mosaic: Combining Gis Methods With Landscape Historical Analysis

Erdős¹

2013

Appl Ecol Env Res

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“…Although Yao and Zhang (2006) propose a method for colour photographs, a suitable method for panchromatic photographs still does not exist. Combining classification and segmentation would lead to a good result, considering every black pixel as shadow, but as supervised classification leads to false results (Cserhalmi and Kristóf 2007) with panchromatic photographs, manual shadow detection is still the most practicable method.…”

Section: Manual Mapping Versus Digital Image Interpretationmentioning

confidence: 99%

“…When performed on multi-spectral satellite images, classification can separate different plant associations, as well as different species due to the spectral differences (Schmidt and Skidmore 2002;Sickel et al 2004;Langake et al 2007). Using panchromatic photographs, however, only a few habitat types can be separated at a coarse landscape level and classic image analysis cannot be performed (Cserhalmi and Kristóf 2007).…”

Section: Introductionmentioning

confidence: 99%

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Changes in a Wetland Ecosystem: A Vegetation Reconstruction Study Based on Historical Panchromatic Aerial Photographs and Succession Patterns

Cserhalmi

Nagy

Kristóf³

et al. 2011

Folia Geobot

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This paper presents the methodology and results of a vegetation reconstruction method based on botanical sampling, the knowledge of succession pattern, digital photograph-interpretation and automatic delineation via image segmentation. The aim is to provide a methodology for interpretation of archived black-and-white aerial photographs, which can be applied at other study sites. Our study area was the Nyíres-tó mire in the Bereg Plain (NE Hungary). Initially, botanical sampling was carried out, and this was followed by separation and identification of current vegetation types. In our study we selected automatic delineation using multi-resolution image segmentation as the method for vegetation mapping. Based on the present-day vegetation map produced and the known successional pathway of the mire, archive aerial photographs were analyzed separately in reverse chronological order to derive plant associations present at the different photograph acquisition dates. With this method we were able to make a chronological sequence of digital vegetation maps over a period of almost fifty years . The analysis of vegetation maps showed that forest cover increased steadily until 1988. After an artificial water supply was introduced (in 1986), the spread of tree-dominated associations became slower, and the relative cover of the different vegetation types reached a stable state.

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The reconstruction of vegetation change in Nyíres-tó mire (ne Hungary): An image-segmentation study

Cserhalmi¹,

Nagy²,

Neidert³

et al. 2010

Acta Botanica Hungarica

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Vegetation change detection of mires with digital aerial photographs

Cited by 3 publications

References 5 publications

Shrub Encroachment in a Wooded-Steppe Mosaic: Combining Gis Methods With Landscape Historical Analysis

Shrub Encroachment in a Wooded-Steppe Mosaic: Combining Gis Methods With Landscape Historical Analysis

Changes in a Wetland Ecosystem: A Vegetation Reconstruction Study Based on Historical Panchromatic Aerial Photographs and Succession Patterns

The reconstruction of vegetation change in Nyíres-tó mire (ne Hungary): An image-segmentation study

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