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4

In the conversion world, what you've built is known as a "bowtie". If you really want that shape, you need to conform to topology rules by making a multipart polygon with "left hand rule" part vertices {0,0},{0.5,0.5},{0,1},{0,0} and {0.5,0.5},{1,0},{1,1},{0.5,0.5} (reverse the order [or just swap vertices 2 & 3 in each part] to generate "right hand ...


0

You'll need to convert your geographic coordinates into a projection that has a coordinate system that allows you to use Cartesian math to calculate area. I believe UTM is the accepted standard projection, as it is very simple to select a zone based on your latitude and longitude, and also the distortion is minimal, even across zones. So, if you have a ...


5

Your units are in decimal degrees and they should be in a projected coordinate system. If you still have the gps unit, you can change it to something like an appropriate UTM projection then download the coordinates and use those in your calculation.


2

Googling a bit I came to know this "ringer" experimental plugin for qgis, which seems to be good for your task. If this works (I did not test it), this would let you convert your holes into polygons. Then you would create a new field in the attribute table of the new polygons and calculate their area (with the field calculator). Then you would merge the hole ...


3

1) create polygons where you have a hole. This can be done with the "difference" tool (just manually draw a large polygon in another layer, or do it with the buffer tool). 2) select the polygons which are less than 200m² and merge those with your original shapefile (you can use the union tool). 3) use the dissolve tool to revert to a single polygon


0

Sort intersect result in descending order using Shape_area. Find min objectid for f.net polygon, using f.net uniqueid as case field. Delete ones != min objectid. Join remaining to f.net polygons using their unique id. Forgot to mention, each ecoregion has to be 1 shape, thus intersect result in only 1 same type region per square polygon (dissolve first?) ...


0

You could overlay them using an Intersect, then do a statistics to find out the largest area based on the ecoregion - and join this stats table to the fishnet.


1

I write this html script for you from this formule, x and y are taken from your example. Edit : This code was written for your previous question in which you are looking for a javascript code (This question has been deleted). I'm sorry if I'm off topic and I hope this code will help you anyway. <!DOCTYPE html> <html> <head> ...



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