Accuracy of GPS data

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Hi all,

Does anyone here have any findings on how accurate is the GPS data that is captured in CHT.

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Hi @antony !

There’s two main factors on how accurate CHT data will be which are outside the control of the CHT:

  1. Location at time of form input: If the handset is indoors or outside but behind large buildings, there’s a chance that GPS may not work or work poorly.
  2. The performance of the mobile handset itself. Newer devices tend to work better and some older devices or devices with out of date software can take a while to get a GPS signal.

Otherwise, when the GPS signal is found, the CHT is incredibly accurate. For example, you can see in our example COVID workflow, there’s some JSON attached to the sample form with the geolocation field. This shows data with with 7 decimal places (eg "latitude": 5.3951438) - well under a 1 meter accuracy (a software embellishment though, likely 10 meter accuracy is more realistic).

To read more about our GPS data, see the geo* fields attached to forms and in our telemetry. As well, this forum post does a deep dive into some GPS specifics in relation to the CHT.

Please let me know if this answers your question!

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Thank you very much @mrjones for your detailed response cc @iesmail

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