First Results for the GPS Survey of South Africa Tide Gauges

GPS Solutions ◽  
2001 ◽  
Vol 5 (2) ◽  
pp. 78-86
Author(s):  
Robert Zimba ◽  
Charles L. Merry
Keyword(s):  
South Africa ◽  
Tide Gauges ◽  
Gps Survey ◽  
First Results

scholarly journals First results and experience with PRRT in South Africa

2018 ◽  
Vol 17 (2) ◽  
pp. 86
Author(s):  
Mariza Vorster ◽  
MR Modiselle ◽  
CS Corbett ◽  
IO Lawal ◽  
JohnR Buscombe ◽  
...  
Keyword(s):  
South Africa ◽  
First Results

scholarly journals Terrain modelling by kinematical GPS survey

2005 ◽  
Vol 5 (2) ◽  
pp. 293-299 ◽  
Author(s):  
G. Nico ◽  
P. Rutigliano ◽  
C. Benedetto ◽  
F. Vespe
Keyword(s):  
Digital Terrain Model ◽  
Monte Carlo Analysis ◽  
Sampling Procedure ◽  
Archaeological Sites ◽  
Kinematic Gps ◽  
Terrain Model ◽  
Gps Survey ◽  
Digital Terrain ◽  
First Results ◽  
The Stability

Abstract. This work presents the first results of an experiment aiming to derive a high resolution Digital Terrain Model (DTM) by kinematic GPS surveying. The accuracy of the DTM depends on both the operational GPS precision and the density of GPS samples. The operational GPS precision, measured in the field, is about 10cm. A Monte Carlo analysis is performed to study the dependence of the DTM error on the sampling procedure. The outcome of this analysis is that the accuracy of the topographic reconstruction is less than 1m even in areas with a density of samples as low as one sample per 100m2, and becomes about 30cm in areas with at least one sample per 10m2. The kinematic GPS technique gives a means for a fast and accurate mapping of terrain surfaces with an extension of a few km2. Examples of application are the investigation of archaeological sites and the stability analysis of landslide prone areas.

scholarly journals First results of cirrus clouds properties by means of a pollyxt raman lidar at two measurement sites

2018 ◽  
Vol 176 ◽  
pp. 05031 ◽  
Author(s):  
Kalliopi – Artemis Voudouri ◽  
Elina Giannakaki ◽  
Mika Komppula ◽  
Dimitris Balis
Keyword(s):  
South Africa ◽  
Detection Algorithm ◽  
Cirrus Clouds ◽  
Cirrus Cloud ◽  
New Delhi ◽  
Raman Lidar ◽  
Cloud Properties ◽  
Wide Range ◽  
First Results

Geometrical and optical characteristics of cirrus clouds using Raman lidar PollyXT measurements at different locations are presented. The PollyXT has been participated in two long-term experimental campaigns, one close to New Delhi in India and one at Elandsfontein in South Africa, providing continuous measurements and covering a wide range of cloud types. First results of cirrus cloud properties at different latitudes, as well as their temporal distributions are presented in this study. An automatic cirrus clouds detection algorithm is applied based on the wavelet covariance transform. The measurements at New Delhi performed from March 2008 to February 2009, while at Elandsfontein measurements were performed from December 2009 to January 2011.

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