Will the Area – Distance app work in the United Kingdom? I am looking for an app to accurately measure areas of invasive weeds on various sites.

 1. Areas by Digitization

The Area – Distance app and the Partition – Distance – Area app will let you precisely digitize areas over the Apple Map that comes with your iPhone or iPad device.

At this writing, the scale of the Map for the United States can go down to 1″ = 25 ft in the Show Standard mode. In the Satellite or Hybrid mode, it can go down to about 1″ = 40 ft.

It seems in England (say, around Manchester), the Map scale can go down to about 1″ = 90 ft in Show Standard mode, and about 1″ = 145 ft in the Satellite or Hybrid mode.

When Map is turned off, the scale can go down to 1″ = 0.01 ft.

 The app will let you precisely digitize an area on the screen. The actual accuracy for a digitized area will depend on the Map scale used.

Needless to say, it is much easier to digitize on the large iPad screen than on the tiny iPhone screen.

2. Areas by GPS

If you will be delineating the areas of invasive weeds using built-in or external real-time GPS, the app to use would be our iCMTGIS II for the iPad, or our iGPSGIS II for the iPhone. In this case, the accuracy will depend on the GPS device used. The current GIS-grade GPS (like the one built-in the iPhone or the one that comes with some iPad configurations) is adequate for measuring larger acreages.

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