Device for mapping measurements of a physical dimension, characterised in that it comprises: - at least two self-contained detectors for measuring a physical dimension, each of which comprises: - at least one sensor for sensing a value representing a physical dimension; - a geolocation means, configured to provide geolocation coordinates of the detector; - an emitter of a wireless signal representing each detected value and the coordinates determined, the emitter also acting as a receiver; and - a self-contained electric power supply configured to power the detector,each sensor, the geolocation means, the emitter and the power supply being embedded in a flexible, shock-resistant shell, and in a sealed shell, the device further comprising: - a receiver of at least one wireless signal emitted by at least one detector; and - a display system configured to display at least one representative value received in the signal and an item of information representative of the coordinates associated with the value received; - a self-contained electric power supply using rechargeable or disposable batteries; and - a means for transferring electric power to at least one detector connected to the power supply, characterised in that the device also comprises a means for determining the coordinates of a detector to be positioned as a function of coordinates received from at least two detectors; and a means for displaying the coordinates determined. - at least two self-contained detectors for measuring a physical dimension, each of which comprises: - at least one sensor for sensing a value representing a physical dimension; - a geolocation means, configured to provide geolocation coordinates of the detector; - an emitter of a wireless signal representing each detected value and the coordinates determined, the emitter also acting as a receiver; and - at least one sensor for sensing a value representing a physical dimension; - a geolocation means, configured to provide geolocation coordinates of the detector; - an emitter of a wireless signal representing each detected value and the coordinates determined, the emitter also acting as a receiver; and - a self-contained electric power supply configured to power the detector,each sensor, the geolocation means, the emitter and the power supply being embedded in a flexible, shock-resistant shell, and in a sealed shell, the device further comprising: - a receiver of at least one wireless signal emitted by at least one detector; and - a display system configured to display at least one representative value received in the signal and an item of information representative of the coordinates associated with the value received; - a self-contained electric power supply using rechargeable or disposable batteries; and - a means for transferring electric power to at least one detector connected to the power supply, - a receiver of at least one wireless signal emitted by at least one detector; and - a display system configured to display at least one representative value received in the signal and an item of information representative of the coordinates associated with the value received; - a self-contained electric power supply using rechargeable or disposable batteries; and - a means for transferring electric power to at least one detector connected to the power supply,