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Browsing by Author "Engelbrecht, Jeanine"

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Change detection of bare areas in the Xolobeni region, South Africa using Landsat NDVI

Author: Singh, RG ; Engelbrecht, Jeanine ; Kemp, J Date: Jun 2015 Identification and protection of areas that are vulnerable to erosion is essential for the conservation of the sensitive wetlands and estuarine ecosystems along the Xolobeni coastal strip. The forecasting of these erosion susceptible areas ... Read more
Detecting historic informal settlement fires with sentinel 1 and 2 satellite data - Two case studies in Cape Town

Author: Gibson, L ; Engelbrecht, Jeanine ; Rush, D Date: Sep 2019 Increasing global urbanisation is leading to a rise in the number of people living in informal settlements, challenging our ability to achieve sustainable development goals. As a consequence of high building density, inadequate building methods ... Read more
Detection of sinkhole precursors through SAR interferometry: radar and geological considerations

Author: Theron, Andre ; Engelbrecht, Jeanine ; Kemp, J ; Kleynhans, Waldo ; Turnbull, T Date: Jun 2017 Sinkholes are an unpredictable geohazard that endanger life and property in dolomitic terrains. Sinkholes are a significant threat in Gauteng, South Africa’s most populated and urbanized province. Small-scale surface subsidence is frequently ... Read more
Fully polarimetric ALOS PALSAR data to aid geological mapping in densely vegetated areas

Author: Engelbrecht, Jeanine Date: Aug 2016 The analysis of image data from space-borne or airborne sensors has been widely used to aid geological mapping. The advantages of using remotely sensed data are numerous and include the fact that large areas can be observed in a single ... Read more
Longwall mining and surface deformation – lessons learned from dInSAR measurements

Author: Engelbrecht, Jeanine ; Inggs, MR Date: Aug 2016 Differential radar interferometry (dInSAR) techniques are well known for their ability to provide mm- to cm-scale measurements of surface deformation. Very accurate measurements of deformation have been achieved in several areas of research ... Read more
The management of scarce water resources using GNSS, InSAR and in-situ micro gravity measurements as monitoring tools

Author: Wonnacott, R ; Hartnady, C ; Engelbrecht, Jeanine Date: Aug 2015 South Africa is a water scarce country hence the careful monitoring and management of available water resources is critical for the wellbeing of the citizens of the country. A high percentage of the Earth’s water supply is stored underground ... Read more
Monitoring soil erosion features using a time series of airborne remote sensing data: a case study Wild Coast, South Africa

Author: Singh, RG ; Engelbrecht, Jeanine ; Botha, GA ; Kemp, J Date: Oct 2014 Soil erosion is a major geohazard that may pose both localized and off-site threats. Erosion by wind and water has caused severe land degradation in the Eastern Cape and if left uncontrolled may have detrimental consequences in critical ... Read more
Monitoring surface deformation associated with groundwater abstraction in the Western Cape using SAR Interferometry

Author: Theron, Andre ; Engelbrecht, Jeanine Date: Oct 2018 Aquifers are able to contain significant amounts of water, which is typically stored in the pore spaces between sand particles or in the fissures and matrix of rocks. This groundwater is an increasingly important source of water in many parts ... Read more
PolinSAR coherence optimisation for deformation measurement in an agricultural region

Author: Engelbrecht, Jeanine ; Inggs, M Date: Oct 2015 Surface deformation due to underground mining poses risks to health and safety as well as infrastructure and the environment. Consequently, the need for long-term operational monitoring systems exists. Differential interferometry (dInSAR) ... Read more
Potential of sinkhole precursor detection through interferometric SAR

Author: Theron, Andre ; Engelbrecht, Jeanine ; Kemp, J Date: Aug 2016 Sinkholes are an unpredictable geohazard that endangers life and structures in susceptible areas globally. Subsidence sinkholes occur above cavernous bedrock comprised of highly soluble evaporates or calcium carbonates such as dolomite or ... Read more
The role of earth observation, with a focus on SAR Interferometry, for sinkhole hazard assessment

Author: Theron, Andre ; Engelbrecht, Jeanine Date: Sep 2018 Sinkholes are global phenomena with significant consequences on the natural- and built environment. Significant efforts have been devoted to the assessment of sinkhole hazards to predict the spatial and temporal occurrence of future sinkholes ... Read more
Satellite synthetic aperture radar for monitoring of surface deformation in shallow underground mining environments

Author: Engelbrecht, Jeanine ; Inggs, MR Date: Aug 2016 Surface deformations associated with shallow underground mining activities have significant implications for both the natural- and built environment. Environmental problems include the exacerbation of acid mine drainage and the alteration of ... Read more
A simple normalized difference approach to burnt area mapping using multi-polarisation C-Band SAR

Author: Engelbrecht, Jeanine ; Theron, Andre ; Vhengani, Lufuno ; Kemp, J Date: Jul 2017 In fire-prone ecosystems, periodic fires are vital for ecosystem functioning. Fire managers seek to promote the optimal fire regime by managing fire season and frequency requiring detailed information on the extent and date of previous burns. ... Read more
Subsidence feature discrimination using deep convolutional neral networks in synthetic aperture radar imagery

Author: Schwegmann, Colin P ; Kleynhans, Waldo ; Engelbrecht, Jeanine ; Mdakane, Lizwe W ; Meyer, Rory GV Date: Jul 2017 Effective detection and discrimination of surface deformation features in Synthetic Aperture Radar imagery is one of the most important applications of the data. Areas that undergo surface deformation can pose health and safety risks which ... Read more
The use of Landsat and aerial photography for the assessment of coastal erosion and erosion susceptibility in False Bay, South Africa

Author: Callaghan, K ; Engelbrecht, Jeanine ; Kemp, J Date: Jun 2015 Coastal erosion is a worldwide hazard, the consequences of which can only be mitigated via thorough and efficient monitoring of erosion. This study aimed to employ remote sensing techniques on aerial photographs and Landsat TM/ETM+ imagery ... Read more

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