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2. Segmentation quality evaluation for large scale mapping purposes in Flanders, Belgium

Author

Vancoillie, Frieke, Van Camp, Nancy, De Wulf, Robert, Bral, Lander, Gautama, Sidharta, Addink, E. A., and Van Coillie, F. M. B.

Subjects
large scale mapping, Image segmentation, segmentation evaluation, segmentation quality, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Science General
Abstract

In Flanders the large scale reference database called GRB, takes care of the layout, exchange and management of large scale geographic information with respect to, amongst others, roads, buildings and parcels. As Flanders is extremely urbanized (average population density of about 450 inhabitants per square kilometer), the large scale maps need to be highly accurate. Currently, accuracies at the centimeter level are guaranteed due to topographic field measurements aided by standard photogrammetry based on analogue aerial photographs. In order to speed up the GRB production and to ensure large scale map products at the long term, it is essential to automate this labour-intensive, but highly accurate production process. Segmentation of very high resolution digital images could be an alternative approach for maintaining and updating the Flemish GRB as long as high accuracy segmentation results are obtained. Based on DMC images (8 cm ground resolution) and several reference buildings, a comprehensive sensitivity analysis is performed testing different segmentation parameter settings in order to gain insight into their impact on segmentation accuracy. The segmentation quality is evaluated using similarity measures focusing on aspects of presence, shape and positional accuracy where emphasis is placed on interpretability of the measures with respect to operational conditions put on the reference data. The end user should be able to read the measures and link this to the return-on-investment he will gain by using a given segmentation process on his data.

Published
2010

5. Inventory-based carbon stock of Flemish forests: a comparison of European biomass expansion factors

Author

Van Camp, Nancy, primary, Vande Walle, Inge, additional, Mertens, Jan, additional, De Neve, Stefaan, additional, Samson, Roeland, additional, Lust, No�l, additional, Lemeur, Raoul, additional, Boeckx, Pascal, additional, Lootens, Peter, additional, Beheydt, Daan, additional, Mestdagh, Inge, additional, Sleutel, Steven, additional, Verbeeck, Hans, additional, Van Cleemput, Oswald, additional, Hofman, Georges, additional, and Carlier, Lucien, additional

Published
2004
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6. Short-rotation forestry of birch, maple, poplar and willow in Flanders (Belgium) II. Energy production and CO2 emission reduction potential

Author

Vande Walle, Inge, Van Camp, Nancy, Van de Casteele, Liesbet, Verheyen, Kris, and Lemeur, Raoul

Subjects
*FORESTS & forestry, *BIOMASS energy, *ELECTRICITY, *MAGNETISM
Abstract

Abstract: Belgium, being an EU country, has committed itself to a 7.5% reduction of greenhouse gas emissions during the first commitment period of the Kyoto Protocol. Within this framework, the Flemish government aims at reaching a share of 6% of renewable electricity in the total electricity production by 2010. In this work, the biomass production of birch, maple, poplar and willow in a short-rotation forestry (SRF) plantation after a 4-year growth period served as the base to calculate the amount of (electrical) energy that could be produced by this type of bioenergy crop in Flanders. The maximum amount of electricity that could be provided by SRF biomass was estimated at 72.9GWhe year−1, which only accounts for 0.16% of the total electricity production in this region. Although the energy output was rather low, the bioenergy production process under consideration appeared to be more energy efficient than energy production processes based on fossil fuels. The high efficiency of birch compared to the other species was mainly due to the high calorific value of the birch wood. The maximum CO2 emission reduction potential of SRF plantations in Flanders was estimated at only 0.09% of the total annual CO2 emission. The most interesting application of SRF in Flanders seemed to be the establishment of small-scale plantations, linked to a local combined heat and power plant. These plantations could be established on marginal arable soils or on polluted sites, and they could be of importance in the densely populated area of Flanders because of other environmental benefits, among which their function as (temporary) habitat for many species. [Copyright &y& Elsevier]

Published
2007
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