Articles by Keyword: Satellite Altimetry

Search results for Satellite Altimetry

We found 16 results for you
  1. Sea level changes at Ascension Island in the last half century

    Sea level changes at Ascension Island in the last half century

    Item type: Journal Article • Journal: African Journal of Marine Science
    An exercise in ‘data archaeology’ at Ascension Island has provided an estimate of sea level change between 1955 and 2001.5 (the mid-point of a recent dataset spanning 1993–2009). That average trend of 0.93 mm y−1 (SE 0.69) compares to a...
  2. Transport and transformation of surface water masses across the Mascarene Plateau during the Northeast Monsoon season

    Transport and transformation of surface water masses across the Mascarene Plateau during the Northeast Monsoon season

    Item type: Journal Article • Journal: African Journal of Marine Science
    The Mascarene Plateau lies in the south-west Indian Ocean between the islands of Mauritius and the Seychelles Bank, and is characterised by a series of shallow banks separated by deep (>1 000 m), narrow channels. The plateau acts as an...
  3. CHANGES IN URBAN RESIDENTIAL LAND IN THE RIETSPRUIT CATCHMENT, SOUTHERN TRANSVAAL

    CHANGES IN URBAN RESIDENTIAL LAND IN THE RIETSPRUIT CATCHMENT, SOUTHERN TRANSVAAL

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Informal settlements have become an important and rapidly-expanding component of urban development in South Africa. In the Rietspruit catchment, south-west of Johannesburg, average growth rates in urban land cover of up to 2.7 km2 per year (1972–1991) were measured from...
  4. Veld fire reporting and mapping techniques in the Kruger National Park, South Africa, from 1941 to 2011

    Veld fire reporting and mapping techniques in the Kruger National Park, South Africa, from 1941 to 2011

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Fire has long been regarded as a major determinant of ecosystem structure and function within African savannas. Improvements in fire detection, mapping and recordings of fire activity over the past few years have made it possible to provide more reliable...
  5. Remote sensing from space—present and future applications in forestry, nature conservation and landscape management

    Remote sensing from space—present and future applications in forestry, nature conservation and landscape management

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Past studies have suggested that sound knowledge about the reflectance characteristics of objects could be of great value in understanding the physical, chemical, and the spatial properties of features on our planet. These characteristics can be assessed remotely, and the...
  6. Climatology and Variability of Sea Surface Temperature and Surface Chlorophyll in the Benguela and Agulhas Ecosystems As Observed by Satellite Imagery

    Climatology and Variability of Sea Surface Temperature and Surface Chlorophyll in the Benguela and Agulhas Ecosystems As Observed by Satellite Imagery

    Item type: Journal Article • Journal: African Journal of Marine Science
    A climatology of satellite-derived sea surface semperature (SST) and surface chlorophyll a concentration (Chl), and their associated variability at time-scales from weeks to years, was constructed for the Benguela and Agulhas ecosystems. Global area coverage data at 4.5 km spatial...
  7. Seasonal variation in phytoplankton in the southern Benguela: pigment indices and ocean colour

    Seasonal variation in phytoplankton in the southern Benguela: pigment indices and ocean colour

    Item type: Journal Article • Journal: African Journal of Marine Science
    Pigment indices and satellite imagery were used to investigate the seasonal variation in phytoplankton in the southern Benguela, with the aid of monthly monitoring on two transect lines. Sea surface temperature images revealed the similarity in thermal conditions during autumn,...
  8. The estimation of the growing stock of eucalypt plantation forests, based on spectral signatures of satellite imagery, in South Africa

    The estimation of the growing stock of eucalypt plantation forests, based on spectral signatures of satellite imagery, in South Africa

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    The present study deals with the application of spectral signatures, obtained from multispectral satellite images, in order to obtain regression estimates for the timber volume per unit area. The studies were carried out in South African Eucalyptus plantations. The grayscale...
  9. Satellite tracking of a young Steppe Eagle from the United Arab Emirates during two spring and autumn migrations

    Satellite tracking of a young Steppe Eagle from the United Arab Emirates during two spring and autumn migrations

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Following recovery and successful rehabilitation, a young Steppe Eagle Aquila nipalensis was tagged with a 45 g GPS satellite transmitter to track its migration and identify potential wintering and summering areas of the species passing through the United Arab Emirates...
  10. Home range and diving behaviour of Heaviside's dolphins monitored by satellite off the west coast of South Africa

    Home range and diving behaviour of Heaviside's dolphins monitored by satellite off the west coast of South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Three Heaviside's dolphins Cephalorhynchus heavisidii were fitted with satellite depth recorders off the west coast of South Africa during February–April 1997 and monitored for 51, 73 and 130 days, respectively. In total, 345 locations were received from the three animals,...