The JPL Aircraft Topographic Synthetic Aperture Radar (TOPSAR) Program (2004)
Thompson, T., Zebker, H., Carande, R., Rosen, P., Madsen, S., Hensley, S., ...
NASA/JPL Airborne Three-Frequency Polametric/Interferometric SAR System (2004)
Kim, Y., Lou, Y., Van Zyl, J., Maldonado, L., Miller, T., Sato, T., ...
...In this talk, we will present detailed mission description, hardware configuration, and data processing (of the NASA/JPL airborne SAR system, pupularly known as AIRSAR).
The NASA/JPL Airborne Synthetic Aperture Radar's 1996 PacRim Deployment (2004)
Lou, Y., Kim, Y., Van Zyl, J., Maldonado, L., Miller, T., O'Leary, E., ...
In November and December 1996, the NASA/JPL Airborne Synthetic Aperture Radar System (AIRSAR) embarked on a seven-week campaign to several Pacific Rim countries.
Recent Advances in Wide-Band Polarimetric and Multi-Baseline Interferometry (2004)
Van Zyl, J., Kim, Y., Treuhaft, R.
This paper describes the first fixed-baseline polarmetric interferometry, achieved with Jet Propulsion Laboratory's (JPL) TOPSAR radar with co- and cross-polarized signals.
GeoSAR: A New Radar Terrain Mapping System for the New Millennium (2004)
Thompson, T., Van Zyl, J., Hensley, S., Wheeler, K., Bartman, R., Dildine, G., ...
Radar Mapping of Surface Soil Moisture (2004)
Ulaby, F. T., Dubois, P. C., Van Zyl, J.
Intended as an overview aimed at potential users of remotely sensed spatial distributions and temporal variations of soil moisture, this paper begins with an introductory section on the fundamentals...
Achievements in the Development of Space-borne Imaging Radar (2004)
Kim, Y., Stuhr, F., Van Zyl, J., Rosen, P., Freeman, A., Johnson, W., ...
This article describes past and current achievements in the development of space-borne imaging radar technology and discusses possibilities for the future. The article focuses on space-borne...
POLTOP: Airsar Polarimetric Interferometry (2004)
Kim, Y., Van Zyl, J., Chu, A., O'Leary, E.
The NASA/JPL AIRSAR system was upgraded to collect polarimetric interferometric data from the June 98 deployment.
Overview of Polarimetric Interferometry (2004)
SAR interferometry has enabled two important science applications: surface change detection and topographic mapping.
Single Pass Polarimetric SAR Interferometry (2004)
During the past ten years, the NASA/JPL AIRSAR system has produced polarimetric and interferometric SAR data. SAR polarimetry is useful for characterizing scattering mechanisms while SAR...
Ionospheric Effects on Polarimetric and Interferometric Space-borne SAR (2004)
In this paper, we present ionospheric effects on polarimetric and interferometric SAR images, especially at low frequencies.
The NASA/JPL AIRSAR Integrated Processor (2004)
Chu, A., Kim, Y., Van Zyl, J., Tung, W., O'Leary, E., Lou, Y.
The NASA/JPL AIRSAR Integrated Processor (AIP) is a multi-frequency polarimetric and interferometric SAR processor designed for better understanding of scattering from different types of Earth...
First Results from the GeoSAR Mapping Instrument (2004)
Hensley, S., Wheeler, K., Chapin, E., Freedman, A., Kroger, P., Le, C., ...
Preliminary Results of Single Pass Polarimetric SAR Interferometry (2004)
Unlike scalar interferometry, polarimetric interferometry provides the field cross correlation using various polarization responses.
First Results From the GeoSAR Mapping Instrument (2004)
Hensley, S., Wheeler, K., Berkun, A., Brown, W., Chapin, E., Freedman, A., ...
GeoSAR: A Radar Terrain Mapping System for the New Millennium (2004)
Thompson, T., Van Zyl, J., Hensley, S., Wheeler, K., Bartman, R., Reis, J., ...
Thesis (PhD Agric)--University of Stellenbosch, 2003.
Is there room for innovation in the SA road traffic signs manual ? (2000)
This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document...
Is there room for innovation in the SA road traffic signs manual ? (2000)
This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document...
The CONSERT experiment for the ROSETTA mission (1997)
Kofmann, W., Baarbin, Y., Herique, A., Klinger, J., Levasseur-Regourd, A.C., ...
Van Rooyen, C.J., Swanepoel, F.J.C., Van Zyl, J., Rwelamira, J., Stroebel, A., Doyer, O.T.
This study describes the nature of human capital development (HCD) in agriculture and rural development, and its implications on current programmes in the institutions of higher learning. This is in...
Victor, T, Du Toit, R, Van Zyl, J, Bester, A J, Van Helden, P D
This report describes a DNA amplification procedure for routine identification of heat-labile-toxin-producing Escherichia coli. Two oligonucleotide primers were used in a polymerase chain reaction...
Victor, T, Du Toit, R, Van Zyl, J, Bester, A J, Van Helden, P D
This report describes a DNA amplification procedure for routine identification of heat-labile-toxin-producing Escherichia coli. Two oligonucleotide primers were used in a polymerase chain reaction...
SOUTH AFRICAN AGRICULTURE IN TRANSITION: THE 1990'S
Van Zyl, J., Vink, N., Kirsten, J.F.
International Development,
Assessing the benefits of research expenditures on maize production in South Africa
Townsend, R.F., Van Zyl, J., Thirtle, C.
This paper focuses on assessing the benefits of research expenditures on maize production in South Africa. Both the production and supply function approaches are used to calculate elasticities of...
A social accounting matrix for modeling agriculutral policy reform in South Africa
McDonald, S, Kirsten, J.F., Van Zyl, J.
In this paper the format of a Social Accounting Matrix (SAM) for use as a database for the Computable General Equilibrium (CGE) modelling of agricultural policy reform in South Africa is detailed. It...
Poonyth, D., Van Zyl, J., Meyer, F.
In this study, an econometric model of the South African maize and sorghum sector is estimated. Using the developed model, a market outlook for the two major grain sectors – maize and...
Townsend, R.F., Van Zyl, J., Thirtle, C.
This paper provides an empirical investigation into the long-standing notion of biases of technical change in South African agriculture. The second order cost function is used to derive relative bias...
Sartorius Von Bach, H.J., Townsend, R.F., Van Zyl, J.
A stochastic frontier production function is defined for panel data on maize producing regions of South Africa. Technical inefficiency effects are assumed to be a function of climatic conditions,...
DEFINING SMALL-SCALE FARMERS IN THE SOUTH AFRICAN CONTEXT
South African agriculture is comprised of mainly two categories of farmers -- the subsistence farmers in the former homeland areas and the large-scale commercial (mainly white) farmers. This is in...
The effects of climate change on the farm sector in the Western Cape
Erasmus, B., Van Jaarsveld, A., Van Zyl, J., Vink, N.
This paper links two different methodologies to determine the effects of climate change on the Western Cape farm sector. First, it uses a general circulation model (GCM) to model future climate...
THE RATE OF RETURN ON EXPENDITURES OF THE SOUTH AFRICAN AGRICULTURAL RESEARCH COUNCIL (ARC)
Thirtle, C., Townsend, R.F., Amadi, J., Lusigi, A., Van Zyl, J.
All the rate of return estimates, regardless of methodology or the level of aggregation, are entirely consistent and logical. The returns show that the ARC has been extremely successful economically...
This study evaluates the long run and short run effects of real exchange rate changes on South African agricultural exports using an Error Correction Model (ECM). The results suggest that there is a...
The Effective Protection Ratio (EPR) is used in this study as a measure of the impact of policy distortions on agricultural producers. The results of the EPR analysis show that in 1995, most of the...
Deregulation of Lesotho's maize market
Van Schalkwyk, H.D., Van Zyl, J., Botha, P.W., Bayley, B.
During the past year, there have been major policy reforms in Lesotho and South Africa with respect to maize pricing and marketing. In Lesotho the impact of deregulation on producers, consumers and...
The effects of water policies on the farm sector in the Western Cape
The farm sector of the Western Cape is modelled using a sector mathematical programming model to determine the effect of different water policies on output, prices, welfare and employment. Two...
Representing the production structure of South African agriculture
This paper evaluates the production structure of the South African agricultural sector for the period 1970-1998, using a translog function. The results show that the production structure is best...
Van Zyl, J., Townsend, R.F., Vink, N.
This paper attempts to estimate the effects of some of the changes in the marketing system on the Western Cape Province of South Africa, utilizing a regional linear programming model of the...