topic Re: iOS unable to parse UTM coordinates in ArcGIS Runtime SDK for iOS Questions

iOS unable to parse UTM coordinates

RajH — Mon, 25 Oct 2021 15:03:33 GMT

We are using parse UTM coordinate by doc Esri

But won't able to parse UTM coordinate like - 1Q 433568 m 1978405 m

However, i saw this is able to parse by Mapbox API.

Could you please help me to parse these coordinates?

Re: iOS unable to parse UTM coordinates

Nicholas-Furness — Mon, 25 Oct 2021 15:41:50 GMT

Hi.

You should not have the units in there. Use something like:

let utmString = "1Q 433568 m 1978405 m" let pt = AGSCoordinateFormatter.point( fromUTMString: utmString.replacingOccurrences(of: "m", with: ""), spatialReference: .wgs84(), conversionMode: .latitudeBandIndicators )

That will give you a point at latitude 17.892510, longitude -177.627141, which matches what's returned here: https://awsm-tools.com/geo/utm-to-geographic

Hope that helps.

Re: iOS unable to parse UTM coordinates

RajH — Tue, 26 Oct 2021 09:40:44 GMT

Hi @Nicholas-Furness ,

The expected result would be near to Mexico (lat long -19.164950 -96.148800)

Reference -https://www.maptools.com/tutorials/utm/quick_guide

Any hint to archive this.

Re: iOS unable to parse UTM coordinates

Nicholas-Furness — Tue, 26 Oct 2021 16:01:18 GMT

I'm not sure how you're converting UTM 1Q 433568 1978405 to Lat/Lon -19.164950 -96.148800 (which is in the pacific off the coast of Peru/Chile). I'm guessing you mean +19.164950 -96.148800 which is Veracruz, Mexico.

The closest I can think is that you mean 14Q 433568 1978405 (and not 1Q), which is close to Mexico city and would translate to 17.892510°‎, -99.627141°‎.

See this diagram and description of UTM Grid Zones.

Re: iOS unable to parse UTM coordinates

RajH — Wed, 27 Oct 2021 17:41:15 GMT

Thanks @Nicholas-Furness