We’ve just released on the App store the Cruise Angle iCMT app that will turn the iPhone, iPod and iPad into an angle gauge for selecting trees for point sampling. The point cruise or prism cruise sampling method devised by Walter Bitterlich allows the forester or small woodland owner to easily obtain a quick estimate of the basal area per acre by using an angle gauge to scan the trees at the sampling points. The Cruise Angle iCMT employs the camera on the iOS device to provide an on-screen angle gauge.
This app will let you calibrate your device to obtain an accurate angle-length factor. It will display the tree tally as well as the basal area per acre (or per hectare) for the point cruised. You can select from a list of commonly used BAF values in the English or the metric system. The app comes with functions for calculating limiting distance, leaning tree height and horizontal distance with slope correction. You can also measure distances and areas by delineating them on the Apple Map displayed in the background.
You don’t need a phone signal to work with the cruise angle gauge in this app. Have fun cruising your trees!