« Landfill collecting | Main | Marking Bees »

Find the Seedlings!

I'm working on improving our seedling search protocol, using perhaps photography, a physical grid, or some combination of things. Here's a couple photos I took to test out a locating device: toothpick plus coffee stirrer plus thumbtack. The first photo is in easier short foliage conditions and has two red markers and a blue marker somewhere in the 1m diameter circle marked by the meter sticks. The second photo is in more difficult high foliage and has two red, a blue, and a white. All are visible in both pictures, but perhaps not immediately apparent. Happy hunting!




TrackBack URL for this entry:


Ben, Those are really difficult to find! I wonder if bigger markers would help--maybe something the size of a return address label. Would black text on a white background stand out?

Here's the paper that I recommended:
Booth D.T., Cox S.E., Louhaichi M. & Johnson D.E. (2004). Technical Note: Lightweight Camera Stand for Close-to-Earth Remote Sensing. Rangeland Ecology and Management. 57: 675-678.


I wonder if a red-eye algorithm would find the red markers? I think so. But would anybody care?

I care.

Ben is trying to develop techniques and protocols to make refinding tiny seedlings faster and easier. Currently we make paper maps, which are time-consuming and not always accurate.

Digital photos might help and using or developing an algorithm that will find the pixel coordinates of the red markers in a digital image might be a huge benefit to the project.

Post a comment

(If you haven't left a comment here before, you may need to be approved by the site owner before your comment will appear. Until then, it won't appear on the entry. Thanks for waiting.)