How Tall are our Trees? Measuring Local Trees with Image J Suzanne Elliott September 2008.

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Presentation transcript:

How Tall are our Trees? Measuring Local Trees with Image J Suzanne Elliott September 2008

What is Image J An image processing and analysis tool It was developed by the National Institutes for Health (NIH) It is free to download It is used by a wide range of scientists and other professionals

The Main Menu Menu Bar → Tool Bar → Status Bar → Toolbar

Analyze Menu -Set Scale

How to measure tree height and crown spread Take a photo of the tree with a meter stick for reference Open that photo in Image J

Image Adjust Crop and adjust the contrast if needed

Set the Scale 1.Use the magnifying tool to enlarge the meter stick 3. Go to analyze set scale 4. Change the units to meters 5. Change known distance to 1 6. Click OK 2.Use the line tool to draw a line the length of the meter stick

Measure the height and crown 1. Draw a line the length of the tree 2. Select measure from the analyze toolbar this transfers the data to a results window.

Sample Student Slide Honey Locust Gleditsia triacanthos This tree is located on the Pembroke Campus of Brown University. It is 16.5 meters tall and it has a crown span of 22 meters.

Resources/credits thiis is a useful guide on Image J basics