Re: [libreoffice-users] Re: Filter algorithm question

Correction

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 
> counter +1
> 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 
> GPS resolution.
------------------------------
> 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 
> > idea.
> > If I had a known irregular shape I could map it onto the existing 
> > grid. A
> > brute force approach would be to just make a list of all the X-Y 
> > coordinates
> > in the irregular area, then just search through the entire grid and 
> > see if
> > any coordinates show up in the list, and count them if they do. If 
> > the grid
> > spacing was coarse enough I suppose I could do this on graph paper.
> >                                            Creating this kind of 
> > pre-defined
> > list with a grid that had a lot of coordinates would be tougher as it 
> > would
> > need to be done programmatically. I think a drawing program where you 
> > have a
> > grid and mark coordinates perhaps as the mouse cursor goes over them 
> > could
> > generate the boundry coordinates of the irregular inner area. The 
> > task then
> > would be to somehow programmatically create a list of all the 
> > coordinates
> > within that area and write them to a list. I've noticed the MS Paint 
> > app has
> > a "fill" function to color in some boundried figure you've drawn with 
> > the
> > mouse. So maybe theres an algorithm out there for this somewhere.
> >
> >
> >
> > --
> > View this message in context: 
> > http://nabble.documentfoundation.org/Filter-algorithm-question-tp4141022p4141061.html
> > Sent from the Users mailing list archive at Nabble.com.


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