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Browsing by Author "Roy, DP"

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Identifying individual fires from satellite-derived burned area data

Author: Archibald, S ; Roy, DP Date: Jul 2009 An algorithm for identifying individual fires from the Modis burned area data product is introduced for southern Africa. This algorithm gives the date of burning, size of fire, and location of the centroid for all fires identified over 8 years ... Read more
Implementation and testing of WELD and automatic spectral rule-based classifications for Landsat ETM+ in South Africa

Author: Wessels, Konrad J ; Salmon, BP ; Van den Bergh, F ; Steenkamp, Karen C ; Kleynhans, W ; Swanepoel, D ; Kleyn, L ; Roy, DP ; Kovalskyy, V Date: Apr 2013 The Web-enabled Landsat Data (WELD) system was successfully installed in South Africa (SA) and used for pre-processing large amounts of Landsat ETM+ data to composited seasonal mosaics. In pursuit of automated land cover mapping, the overall ... Read more
Rapid land cover map updates using change detection and robust random forest classifiers

Author: Wessels, Konrad J ; Van den Bergh, F ; Roy, DP ; Salmon, BP ; Steenkamp, Karen C ; MacAlister, B ; Swanepoel, D ; Jewit, D Date: 2016 The paper evaluated the Landsat Automated Land Cover Update Mapping (LALCUM) system designed to rapidly update a land cover map to a desired nominal year using a pre-existing reference land cover map. The system uses the Iteratively Reweighted ... Read more
Southern Africa Fire Network (SAFNet) regional burned-area product-validation protocol

Author: Roy, DP ; Frost, PGH ; Justice, CO ; Landmann, T ; Le Roux, JL ; Gumbo, K ; Makungwa, S ; Dunham, K ; Du Toit, R ; Mhwandagara, K ; Zacarias, A ; Tacheba, B ; Dube, OP ; Pereira, JMC ; Mushove, P ; Morisette, JT ; Vannan, SKS ; Davies, D Date: 10 Oct 2005 The development of appropriate validation techniques is critical to assess uncertainties associated with satellite-data-based products, to identify needed product improvements and to allow products to be used appropriately. At regional to ... Read more
The utility of satellite fire product accuracy Information-perspectives and recommendations from the Southern Africa fire network

Author: Roy, DP ; Trigg, S N ; Bhima, R ; Brockett, BH ; Dube, OP ; Frost, P ; Govender, Natasha ; Le Roux, Jaco ; Neo-Mahupeleng, G ; Norman, M ; Virgilo, S Date: Jul 2006 This correspondence gives Southern Africa Fire Network (SAFNet) perspectives on the utility of satellite fire product accuracy information, drawing on two main sources: insights gained during SAFNet’s six years of working together, and relevant ... Read more
What limits fire? an examination of drivers of burnt area in Southern Africa

Author: Archibald, SA ; Roy, DP ; Van Wilgen, BW ; Scholes, RJ Date: Mar 2009 The factors controlling the extent of fire in Africa south of the equator were investigated using moderate resolution (500 m) satellite-derived burned area maps and spatial data on the environmental factors thought to affect burnt area. A ... Read more

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Browsing by Author "Roy, DP"

Browsing by Author "Roy, DP"

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