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Displaying 521 - 525 of 661Testing the red edge channel for improving land-use classifications based on high-resolution multi-spectral satellite data
The incorporation of a red edge channel in multi-spectral satellite sensors has potential for improving land-use classification, as the related electromagnetic spectrum is specifically sensitive to vegetation chlorophyll content. RapidEye is the first high-resolution multi-spectral satellite system that operationally provides a red edge channel. The objective of this study is to test the potential of the RapidEye red edge channel for improving the classification of land use, investigated at a study site west of Berlin.
Unsupervised and supervised classification of hyperspectral imaging data using projection pursuit and Markov random field segmentation
This work presents a classification technique for hyperspectral image analysis when concurrent ground truth is either unavailable or available. The method adopts a principal component analysis (PCA)-based projection pursuit (PP) procedure with an entropy index for dimensionality reduction, followed by a Markov random field (MRF) model-based segmentation. An ordinal optimization approach to PP determines a set of ‘good enough projections’ with high probability, the best among which is chosen with the help of MRF model-based segmentation.
Agrarian reform and transition: what can we learn from ‘the east’?
During the past two decades agrarian (‘land and farm’) reforms have been widespread in the transition economies of Eastern Europe, the Caucasus and Central Asia (EECCA), following earlier ones in Asia (China and Vietnam). However, independent family farms did not become the predominant sector in most of Eastern Europe. A new dual (or bi-modal) agrarian structure emerged, consisting of large farm enterprises (with much less social functions than they had before), and very small peasant farms or subsidiary plots.
A Participatory GIS Approach for Assessing Land Suitability for Rainwater Harvesting in an Arid Rangeland Environment
The dry rangelands of West Asia and North Africa are fragile and severely degraded due to low rainfall and mismanagement of natural resources. Rainwater harvesting (RWH) interventions are used to increase soil moisture content, vegetation cover, and productivity. However, adoption of rainwater harvesting by communities is slow. To understand adoption constraints and to develop options for sustainable integration of rainwater harvesting, a benchmark watershed was established in the dry rangelands of Jordan.
Migration, Informal Urban Settlements and Non-market Land Transactions: a case study of Wewak, East Sepik Province, Papua New Guinea
This paper examines the various ways in which migrant settlers have gained and maintained access to land in the informal urban settlements of Wewak, the provincial capital of East Sepik Province, Papua New Guinea (PNG). Urban population growth in PNG and in Pacific Island states more generally is predicted to grow rapidly over the next two decades. Given the limited availability of formal housing for lower income people, it is likely that many will live in informal urban settlements on land owned by customary landowners.