Is there an app that can accurately measure short distances, i.e. the length of a soccer field?

The iPhone has a GPS receiver which relies on triangulation, but it doesn't correct for specific local weather phenomena that can affect the speed of radio signal travel. So it's only regularly accurate to +/- 10 meters or so. There may be apps that allow you to apply the weather-specific correction, in which case you might be able to get to +/- 3 meters.

Is that accurate enough?

According to FIFA regulations, soccer pitches can vary immensely in size from 100-131 yards long and 49-100 yards wide.

They can't be measured accurately using GPS but I guess you could walk slowly recording distance 9 or 10 times and taking the average.

Buy a measuring wheel for $20 from Amazon.

jose maria olazabal wrote:

Phones also use WiFi hotspots and cell phone towers for location services, so it could potentially be a lot more accurate than GPS depending on where you are. But, I would not count on it being accurate.

Hotspots and cell towers do not improve accuracy of location. They are sometimes used in lieu of GPS signal to give an approximate location, but it is order of magnitude less accurate than GPS.

A Little Bit Of Science wrote:

jose maria olazabal wrote:

Phones also use WiFi hotspots and cell phone towers for location services, so it could potentially be a lot more accurate than GPS depending on where you are. But, I would not count on it being accurate.

Hotspots and cell towers do not improve accuracy of location. They are sometimes used in lieu of GPS signal to give an approximate location, but it is order of magnitude less accurate than GPS.

Yup. The approximate location provided by Wifi and cellular triangulation can also help cell phones get GPS fixes faster but it does not make them more accurate than GPS at all.

My grandpa has a 3-Dimensional Aviation GPS receiver he takes when flying his ultralight that is far more accurate than consumer grade 2D GPS. I don't know what the cost is though.

The Garmin Fenix 2 has an area calculator. It's pretty cool and that would be about the only useful thing for it.

There are some camera-based measuring apps. I don't know how well they work, though.

Here's one:

https://play.google.com/store/apps/details?id=kr.sira.measure&hl=en

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ffs get a roll of string a cut 10 meters and presto you can use it to measure a field to within +/- 1 meter

plenty of other ways to do it without relying on electronics like some helpless infant. Humanity is doomed if your entire generation is like this!