Several georeferenced measurements of electric field were done in a pilot area of Caracas, Venezuela, to verify that the magnitude of radio frequency electromagnetic fields is below the human exposure limits, recommended by the International Commission on Non-Ionizing Radiation Protection. The collected data were analyzed using geographical information systems, with the objective of using interpolation techniques to estimate the average electromagnetic field magnitude, to obtain a continuous dataset that could be represented over a map of the entire pilot area. This paper reviews the three methods of interpolation used: SPLINE, Inverse Distance Weighting (IDW) and KRIGING. A statistical assessment of the resultant continuous surfaces indicates that there is substantial difference between the estimating ability of the three interpolation methods and IDW performing better overall.
Marco A. Azpurua,
K. Dos Ramos,
"A Comparison of Spatial Interpolation Methods for Estimation of Average Electromagnetic Field Magnitude," Progress In Electromagnetics Research M,
Vol. 14, 135-145, 2010. doi:10.2528/PIERM10083103
1. Legendre, P. and L. Legendre, Numerical Ecology, 2nd Ed., Elsevier, Canada, 1998.
2. Anderson, S., "An evaluation of spatial interpolation methods on air temperature in phoenix,", Department of Geography, Arizona State University Tempe, AZ 85287-0104, 2001.
3. Magnus, E. and M. Clyde, "Control Theoretic Splines: Optimal Control, Statistics, and Path Planning," Princeton University Press, 2010.
4. Shepard, D., "A two-dimensional interpolation function for irregularly-spaced data," ACM Annual Conference/Annual Meet-ing, 517-524, 1968.
5. García, E., J. Cepeda, B. Melcón, G. Búrdalo, M. de Barrios, M. Fuentes, and A. Fernández, "Mapa de radiaciones no ionizantes en la ciudad de león,", Universidad de Leó, Spain, 2008.
6. IRPA/ICNIRP, "Guidelines for limiting exposure to time varying electric, magnetic and electromagnetic fields (up to 300 GHz)," Health Physics, Vol. 74, No. 4, 1998.
7. CCIR Report 239-7, "Propagation statistics required for broadcasting services using the frequency range 30 to 1000 MHz,", 1990.
8. CISPR 11, "Industrial, scientific and medical equipment --- Radio-frequency disturbance characteristics --- Limits and methods of measurement,", 2010-05, Annex D..