Visual versus digital analysis for vegetation mapping: Some examples on central Spain

Chuvieco, Emilio; Vega, Javier Martínez

doi:10.1080/10106049009354265

Cited by 9 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Classification accuracy assessment was carried out by calculating the overall accuracy of the classification process (Langley et al. 2001; Chuvieco and Vega 1990) and the kappa (κ) coefficient, which expresses the proportionate reduction in error generated by a classification process compared with the error of a completely random classification (Congalton 1991). The level of accuracy for the 1967 CORONA map output was 69.1%, κ= 69%.…”

Section: Methodsmentioning

confidence: 99%

Natural and human dimensions of environmental change in the proximal reaches of Botswana's Okavango Delta

Hamandawana¹,

Chanda²

2010

Geographical Journal

View full text Add to dashboard Cite

Though wetlands are vital for the proper functioning of terrestrial ecosystems and provisioning of a wide range of goods and services, their sustainability is being threatened by inappropriate human resource use practices due to our limited understanding of how these systems operate and lack of appropriately informed interventions. We attempt to address these limitations by using historical CORONA photographs of 1967, Landsat imagery of 1989, 1994 and 2001 and information from the literature to investigate the role of natural and human factors in influencing the direction of environmental change in the proximal reaches of Botswana's Okavango Delta. Results of this investigation point to fragmentation of natural habitats, localised degradation of areas close to perennial water supplies, significant increase in woody cover, significant decrease in open grassland, increase in scrub and shrubs, deterioration in the quality of grazing and depletion of specific woody species. With the direction of change pointing to persistent decrease in the environment's supporting potentials, there is urgent need to adopt intervention strategies potentially capable of enhancing sustainable utilisation of natural resources in this sub‐region.

show abstract

Section: Methodsmentioning

confidence: 99%

Natural and human dimensions of environmental change in the proximal reaches of Botswana's Okavango Delta

Hamandawana¹,

Chanda²

2010

Geographical Journal

View full text Add to dashboard Cite

show abstract

“…Mapping was performed manually, by the visual interpretation of orthoimages, to achieve the adequate discrimination of the different land types, despite their spectral proximity across the nonhomogeneous study area. This approach was selected since it allows well-trained human image interpreters, with personal experience and knowledge of the area, to clearly detect colour gradations and to integrate textural and contextual information at a small or medium scale [34,35].…”

Section: Mapping the Land Covermentioning

confidence: 99%

Acceleration and Relocation of Abandonment in a Mediterranean Mountainous Landscape: Drivers, Consequences, and Management Implications

Kiziridis

Mastrogianni

Pleniou³

et al. 2022

Land

View full text Add to dashboard Cite

Land abandonment in European mountains threatens habitats shaped for centuries by low-intensity agriculture and grazing. Hence, it is important to identify spatiotemporal patterns in rural abandonment, and relate them to biophysical and socioeconomic drivers. We pursued these goals in the theoretical context of transitions from traditional to productivist and then to post-productivist agriculture. We conducted a case study in a representative of southern Europe sub-mountainous marginal area that was once traditionally exploited (Pindus range, Epirus, Greece). Land cover was mapped from the outset of abandonment (years 1945, 1970, 1996 and 2015), and we subsequently calculated landscape metrics. An Intensity Analysis facilitated the comparison of rates of land cover change between time periods. By employing random forest modelling, we related socioeconomic, physiographic, geological and climatic predictors to land type occurrence and succession intensity. We found that farmland decreased from 30% to 3% during the 70 years of the study period, and that forest increased from 22% to 63%. The landscape’s heterogeneity, ecotone diversity, and spatial aggregation decreased. Abandonment and succession accelerated and relocated to lower elevation, especially during the latest time period, which was related to a second depopulation wave and livestock decrease. The remaining lowland farmlands were of productivist agriculture, and no widespread post-productivist regime was found. Thus, our study supports the view that policies, which have been mainly based on the linear transition of agricultural regimes in northern Europe, must take into account southern European mountains, where widespread abandonment can coexist with limited intensification and extensification.

show abstract

“…This image has only two values, usually one and zero; the 1's represent the areas that meet the stated criteria, while the 0's represent areas that do not meet the criteria (McKendy et al, 1992). Thus, by applying a masking operation, particular subtle features can be isolated from a sub-scene, and with the help of ancillary information or visual interpretation (see Chuvieco and Vega, 1990), they can be incorporated again, from a separate layer, into the generated land use/land cover map.…”

Section: Supervised Classification and Binary Maskingmentioning

confidence: 99%

Using Remote Sensing and GIS for Assessing and Mapping Land Use and Land Qualities in the Hawkesbury‐Nepean River Catchment, Australia

Baja¹,

Chapman²,

Dragovich³

2002

Geocarto International

View full text Add to dashboard Cite

A methodological framework of land resource assessment, based on integrated biophysical information of the land in GIS and remote sensing is presented. The model developed uses two primary sub-models (modules): remote sensing based land use classification, and land suitability assessment. The first module uses Landsat 7 ETM+ images to produce a land use/land cover map of the study area. A site-specific framework was developed for use in thematic information extraction involving the use of visual analysis, spectral-based (automated) procedures, and ancillary information. The second sub-model implements a fuzzy set methodology, and uses soil landscape data sets and a Digital Elevation Model as evaluation criteria. The databases used were all georeferenced and standardised in a GIS format, enabling spatial analyses for possible pairings of data sets to be performed in order to derive new information sub-sets. A test case is presented to map the spatial distribution of runoff Curve Number (CN) using soil landscape data, which were also used for land suitability evaluation, along with existing land use/land cover information. The strategies and analytical procedures developed in this research may be useful in other areas, particularly in projects related to mapping biophysical resources for sustainable land use planning and management.

show abstract

Visual versus digital analysis for vegetation mapping: Some examples on central Spain

Cited by 9 publications

References 13 publications

Natural and human dimensions of environmental change in the proximal reaches of Botswana's Okavango Delta

Natural and human dimensions of environmental change in the proximal reaches of Botswana's Okavango Delta

Acceleration and Relocation of Abandonment in a Mediterranean Mountainous Landscape: Drivers, Consequences, and Management Implications

Using Remote Sensing and GIS for Assessing and Mapping Land Use and Land Qualities in the Hawkesbury‐Nepean River Catchment, Australia

Contact Info

Product

Resources

About