Is there a way to start GPS averaging without any user input when the survey is opened? The would ensure that the user always uses the averaging.
Hi Larry,
Currently there isn't a way to trigger averaging manually. Can you provide more information on your workflow's averaging requirements?
Hi James,
I am setting up gas meter inspections for roughly 250,000 meters over Southern Manitoba. The inspector has a assigned inbox of meters to navigate to. When an inspector gets to the meter, they answer roughly 20 questions about the state of the meter and we would like to take photos (my other question regarding support for photos on inbox based surveys). We are hoping to refine our meter locations and have found that the averaging needs to be used (iPad) to get a position worth using. Currently the inspector will have to press and hold to start the averaging, which is fine, but will get missed knowing the nature of field work and that is where my request came from. Cellular data is ok in the cities, but nonexistent in the rural areas so everything is geared to be disconnected.
Let me know if you want more info…
Thanks,
Larry
Thanks Larry,
I was curious on what you were thinking of in terms of the number of location observations needed to get to a point worth using - is it a set number of observations, a requirement that a set accuracy threshold is within range of the average (say, that 5m is within a 95% confidence interval of the mean), or some other metric?
Hi James, When it really comes down to it, the inspectors will only be at the location as long as it takes to fill out the survey. Ideally that will take 20-30 seconds which I would like to use to get the best averaged position. There will be inspections where the user is there for only 5-10 seconds. The position being acquired to help refine the meter location within the land parcel, which is currently based on the parcel centroid. So the point is not the focus of the survey, but a very helpful piece of data for the next time an inspection is performed. I deal with the fuzziness of GPS locations all the time and with the iPad 5m is pretty much the best you can expect, but the averaging will help get us to the 5m more of the time in whatever time the inspector occupies the location.
That is a practical metric, but not very mathematical…
I'd also like to be able to always go to waypoint averaging automatically, particularly in mountainous terrain. I've noticed that when using favorite answers, if the phone doesn't have a GPS fix first, the survey will pull in the location from the favorite. If the favorite wouldn't include it's location, it would help, but I'd prefer any increase in accuracy offered by averaging. I've had multiple surveys done that showed up at the favorite's location. Some I've been able to locate by using the EXIF data from the accompanying photo taken at the end of the survey.
Hello James Tedrick / Ismael Chivite / Marika Vertzonis
I'm currently testing the beta 3.1.65 release that includes full GNSS metadata capabilities. I have my locational accuracy set to 1ft, and love that Survey123 will ping my GPS receiver until it reaches that threshold then lock in those values. However, what would also be excellent is if GPS Averaging could be initiated without any user input, as Larry Wiebe requests above. Ideally, this may be triggered based on if the survey detects either:
Furthermore, is there already some method to capture the number of positions used to capture an averaged location? If so, I can't find any info on how to get it.
I can't emphasize enough how valuable a "fall back" option such as this would be. It would add significant value to the ability of Survey123 to leverage external GPS receivers which commonly require cellular connectivity to get subfoot accuracies. Knowing I could automatically switch to the averaging option (and not have to rely on field crews to do it for me) would be awesome!
I do think I could rig something up through the use of TWO GeoPoints - making one relevant based on the receiver type and/or ${sourceType}. However, that's a major pain as then I need to query two GeoPoints to determine where I get values such as Lat/Long etc.
yes we agree with you regarding averaging and it is our intention to add the ability for the survey author to specify how many points are to be averaged as a part of the functionalities first full release.
currently averaging only available with the press and hold method and you can not capture the number of positions used.
Has anyone found a way to automatically start GPS averaging when using Survey123 yet?
I've been searching the internet for resources and am now following up on this thread. I'm trying to increase accuracy and minimize the number of details our field crews have to remember when using the app to collect data.
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