Probe (cartography)
In cartography, a probe indicates the depth of water in a given place. With the isobathic (or curved isobaths), it is one of the means used to be reproduced on the charts the topography of the sea-bed.
The probes are relative to a named horizontal reference Zero hydrographic. They not appear the instantaneous depth, which depends in particular on the Marée and the weather-oceanographical phenomena (like the surcotes, but the depth that one could measure in the absence of any periodic phenomenon and of any disturbance. The reference level being selected in the vicinity of the level of the astronomical low tides (low tide of the tides of coefficient 120 or of the extraordinary tides of spring tide of equinox), a probe thus indicates roughly the minimal depth of water in a point, which allows, in theory, with the navigator to choose his road without being concerned with know the height of tide.
The probes represented are selected so as to make appear in priority the dangers (like the shallow waters). The complementary probes are in particular intended to facilitate the reading of the isobaths.
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