CODEWITHSUNDEEP
iphoneiosios4mappingcamera
Echilon
Echilon

Reputation: 10254

Measuring/Calculating Distance in iOS

I need to calculate the distance between two points in iOS. I can guarantee at least an iPhone 4 so the picture quality on the camera should be good. The idea is to calculate the distance to a point using the picture. There's an app called easyMeasure which does exactly what I need to do.

I'm ok with Pythagoras but this boggles my mind. How would I do something like this?

Upvotes: 4

Views: 3258

Answers (2)

Govind
Govind

Reputation: 2348

New update in ios7
@import CoreLocation; @import MapKit;

CLLocation *sanFrancisco = [[CLLocation alloc] initWithLatitude:37.775 longitude:-122.4183333];
CLLocation *portland = [[CLLocation alloc] initWithLatitude:45.5236111 longitude:-122.675];
CLLocationDistance distance = [portland distanceFromLocation:sanFrancisco];

MKDistanceFormatter *formatter = [[MKDistanceFormatter alloc] init];
formatter.units = MKDistanceFormatterUnitsImperial;
NSLog(@"%@", [formatter stringFromDistance:distance]); // 535 miles

Upvotes: 0

Jumhyn
Jumhyn

Reputation: 6777

Ok, so you were correct in that you need to use sine and such. First though, you'll need to find the lens angle of the iPhones camera. Do do this, put the camera a known distance away from the wall and measure how far it is from the edge of the field of vision to the other side and divide by two. To find θ in the picture below, use tanθ = opposite/adjacent, so inverse tan(opposite/adjacent) = θ.

Picture 2

Once you know that, you just have the user take a picture, and give a measurement for how big something on the screen really is. Then just use tanθ = opposite/adjacent, and since you now know θ and the opposite distance, adjacent = opposite/tanθ.

Picture 1

Hope that helps!

Upvotes: 4

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