On 2/23/2015 4:12 PM, Paul D. Mirowsky wrote:
It may be that you are looking for Z axis data at three levels of Z.
0 = All land
1 = All perimeter enclosed data
2 = All bird locations
If Z data = 0 + 1 + 2 = 3 (bird in perimeter) bird in perimeter
If Z data = 0 + 2 + 0 = 2 (bird outside perimeter) bird outside
perimeter counter +1
If location of bird Z data = 2 read x,y for position on map
If location of bird Z data = 3 read x,y for position on map
Use GPS co-ordinates under overlay of image.
0 level is the number of defined points X, Y. Resolution dependent on
Finding the edge alone is more complex because you have to test for
X+1, X-1, Y+1 and Y-1. If any of them are 0 or 2 in the Z axis, it is
a perimeter edge.
It should be do-able in Calc. But I'm sure there are better ways.
Hope this helps.
On 2/22/2015 9:15 PM, office76#xt wrote:
Thanks for the replies,
I like the superimposition
If I had a known irregular shape I could map it onto the existing
brute force approach would be to just make a list of all the X-Y
in the irregular area, then just search through the entire grid and
any coordinates show up in the list, and count them if they do. If
spacing was coarse enough I suppose I could do this on graph paper.
Creating this kind of
list with a grid that had a lot of coordinates would be tougher as it
need to be done programmatically. I think a drawing program where you
grid and mark coordinates perhaps as the mouse cursor goes over them
generate the boundry coordinates of the irregular inner area. The
would be to somehow programmatically create a list of all the
within that area and write them to a list. I've noticed the MS Paint
a "fill" function to color in some boundried figure you've drawn with
mouse. So maybe theres an algorithm out there for this somewhere.
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