Tag:source:ele=barometric

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Public-images-osm logo.svg source:ele = barometric*n
Osm element tag.svg
Description
Elevation information obtained by barometric measurement with N samples.
Group: Annotations
Used on these elements
may be used on nodesmay be used on waysmay be used on areasuse on relations unspecified
Useful combination

ele=*, ele:msl=*

Status: Unspecified

Where elevations are tagged, source:ele=* can store information of the elevation measurement.

With some precautions a reasonably accurate measurement can be obtained with a barometric elevation meter - at least if the measurement is repeated on several trips. The precautions include:

  • calibration of the equipment with a known elevation
  • constant sea level pressure for the duration from the calibration to the measurement - few hours at most.
  • constant temperature of the equipment or temperature corrected equipment

Note: one reasonably accurate measurement can still be even several meters off. Calibrating by the physical sea shore at water level might lead to a significant relative error for the first few meters upward. Experiment with your equipment first to learn when, if ever, its readings are reasonable.

Values

  • barometric or barometric*1 The elevation tagged on this object was obtained with one reasonably accurate measurement
  • barometric*2 The elevation of this object is the average of two reasonably accurate measurements
  • ...
  • barometric*n The elevation of this object is the average of N reasonably accurate measurements

If encountered on an object for which you have obtained a new barometric altitude measurement, you should calculate the new average and update the source:ele=* accordingly.