Land use changes of the riparian landscape in Hungary between 1990 and 2018

The protection and the restoration of rivers is one of the most important challenges of our time, due to the impact of human activities. The aim of the research was to assess the land use changes in the Hungarian riparian landscape. Several landscape corridors of different (50-100-300-500 m) widths near rivers were analyzed since 1990, using the CORINE Land Cover database. Positive changes in the land use of riparian landscape can be seen: continuous increase in the case of forest areas; and slight decrease in the extent of agricultural land since 1990. Unfortunately, the extent of grasslands and other near-natural areas is reduced; and there has been a steady increase in built-up areas. Examining the changes in built-up areas in more detail, a big increase is shown by the extent of urban green areas. As a continuation of the research, an evaluation methodology is being developed to determine the restoration potential of urban rivers on study area level and on national level. The results presented in this paper on land use changes and land use conditions can be useful for the research about restoration potential at national level.

Land cover analysis based on descriptive statistics of Sentinel-2 time series data

In our paper we examined the opportunities of a classification based on descriptive statistics of NDVI
throughout a year’s time series dataset. We used NDVI layers derived from cloud-free Sentinel-2 images
in 2018. The NDVI layers were processed by object-based image analysis and classified into 5 classes, in
accordance with Corine Land Cover (CLC) nomenclature. The result of classification had a 76.2% overall
accuracy. We described the reasons for the disagreement in case of the most remarkable errors. 

Interferences between the ecological network and urbanized areas in Poland

This paper presents spatial relations between Polish urban areas and valuable habitats and links
between them composing the country’s ecological network. The quantitative analysis for 891 towns
and cities was conducted using GIS techniques based on cartographic vector data and statistical data.
Valuable habitats and links between them, such as national parks, landscape parks, CORINE biotopes
sites, wildlife corridors linking NATURA 2000 sites and ECONET areas, can be found in 72% of
Polish towns and cities. The proportion of artificial surfaces in those areas is different depending on
the size of a town or city and its location. Urban areas with the highest index of presence of valuable
habitats and links between them are concentrated in the south of Poland, where settlement network is
most dense. However, in the case of those areas the proportion of artificial surfaces interfering with
the ecological network is lower than Poland’s average, being 16%. The pressure of anthropogenic
land cover extending onto the country’s ecological network is most conspicuous in urban areas with a
population of at least several dozen thousand residents where the average developed area is 20.8% of
their total area. The danger for the continuity of the nature system is best seen in the north western
Poland, where artificial surfaces interference in towns and cities is largest. The analysis performed
identified 82 towns and cities, in which the preservation of the continuity of the ecological network
should be a priority in spatial management because of a higher than average index of the presence of
valuable habitats and links between them and large proportion of artificial surfaces in those areas.