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World Atlas of Ground Conductivities 1.0.0

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The CCIR, considering

a) that for ground-wave field strength prediction, it is essential to know the electrical characteristics of the ground along the path. In cases involving coordination between administrations, it is therefore often necessary to know the ground characteristics existing outside national boundaries;

b)  that the most important electrical characteristic of the earth for frequencies below 3 MHz is the conductivity;

c)  that there is a need for suitable conductivity charts when planning all types of radiocommunication, including

navigational services, in the VLF, LF and MF bands;

d) that conductivity maps are not yet available from all administrations,


1. that the information contained in Annex 1, which is a World Atlas of Ground Conductivities, be used to obtain the best estimate of conductivity for planning purposes;

2. that in presenting new or revised conductivity maps for updating the Atlas, standard values be used as indicated in Table 1.

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