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What's new in this version (2.3):
This app has been mostly redesigned to improve accuracy and ease of use. Now the alignment with the object to be measured is done using the phone's camera viewfinder, instead of by tilting the phone as before. This is a big improvement in accuracy and fun to use.
This app is designed to estimate the height of tall trees, towers or buildings.
Begin by carefully aligning the red dot at the center of the phone's viewfinder phone with the highest point of the building or tree. You should be standing perhaps twice as far away from the object as you estimate its height to be. Preferably you are on level ground at the same elevation as the base of the object.
All the commands in the app are on the sliding menu bar in the center of the screen, When the app opens, the orange button 1 is shown. Scroll the menu down for the other options.
Tap the orange button marked '1) record the angle'. The measured angle and the location where you are standing should then appear written over the orange button.
Your observer position is now marked on the lower map with a yellow dot.
The button marked '2) set observer position on map' is optional and not generally used. Generally this would only be chosen if the GPS location is not accurate enough.
Now scroll down the top half of the screen until the yellow buttons 3a and 3b are visible.
There are two alternatives for inputting the location of the object whose height is being estimated.
Usually you will locate the object on the map by sliding the map until the object is in the center. Then tap yellow button 3a. This option is handy if it is difficult to walk to the base of the object.
Or if you wish, you can walk to the actual base of the object and then tap the yellow button 3b to record the location.
Either way, the object lo0cation should now be marked in yellow on the screen.
To calculate the height estimate, scroll down past the yellow buttons to the green button '4)calculate the height'. Tap this button and the height, distance away, and angle of measurement will appear written in the white box just below on the scrollable center menu.
The height estimate depends somewhat on the variability of the GPS positions, which only claim to be within 10 m of true location. Most often, they seems to be within 3 m of true position.
Note: For the GPS location settings to function accurately, the Location setting must be set to Use Satellite Location on the Location settings of your phone.
It may take a couple of minutes till the satellite connection is established properly and you must wait. You can check whether it has a satisfactory signal by starting Google Maps first, and checking that your location appears on the screen as a blue triangle.
Because it hogs battery power, the Satellite Location setting should be turned off after you finish using the app, unless you choose to leave it on for other apps.