FindColorsTolerance(TreeColor, TPA, MMX1, MMY1, MMX2, MMY2);
Or something like that, and then click in the center of that TPA. Naum has a tutorial about the Wizzy plugin, and he explains TPAs quite well in that. I'd look for TPA tutorials and try that.
If that doesn't work, you can blind click and use RotatePoint (based on the MM to click), then Flag;, search for trees, if trees aren't there, then it's lost. You could look for symbol's, too.
I'd use FindColorsTolerance for the flax, as well. A DTM wouldn't really work.
Or just any color finding.
Is this for Llyeta (or whatever)?