Hi @srg have found an interesting approaching using longside medial axis to to break a polygon into area driven parts. I have not tackled it in FME (yet). But I will now plant this seed.
http://www.khetarpal.org/polygon-splitting/
And see one of the geometry puzzlers amongst us can report back, (apologies @Mark2AtSafe) I am commandeering an unofficial FME Challenge.
I hope to get some work done and come back and look at this. It should go in the FME Hub this is a useful. If i solve it it will be called the 'AreaShardonnay Transformer' or something equally as silly. So someone else should have a go before that happens :)
Hi @srg,
check this article - it uses point cloud technique to split any polygon into smaller ones of the similar sizes:
https://blog.safe.com/2016/05/point-cloud-power/
Dmitri
Hi @srg,
check this article - it uses point cloud technique to split any polygon into smaller ones of the similar sizes:
https://blog.safe.com/2016/05/point-cloud-power/
Dmitri
@dmitribagh no doubt that the pointcloud workspace example does wonders with the polygon splitting and serves the purpose. But I am unable to conclude, how to define the exact number of splits I need using the spacing interval and the number of points per tile parameter!
Hi @srg have found an interesting approaching using longside medial axis to to break a polygon into area driven parts. I have not tackled it in FME (yet). But I will now plant this seed.
http://www.khetarpal.org/polygon-splitting/
And see one of the geometry puzzlers amongst us can report back, (apologies @Mark2AtSafe) I am commandeering an unofficial FME Challenge.
I hope to get some work done and come back and look at this. It should go in the FME Hub this is a useful. If i solve it it will be called the 'AreaShardonnay Transformer' or something equally as silly. So someone else should have a go before that happens :)
@scyphers Good find. But will be a challenging one to implement in FME without the assistance of Safe Software folks!
@david_r good for ArcGIS only! also needs certain other inputs like bearing
@dmitribagh no doubt that the pointcloud workspace example does wonders with the polygon splitting and serves the purpose. But I am unable to conclude, how to define the exact number of splits I need using the spacing interval and the number of points per tile parameter!
Hi @srg,
it is a good question, I found the parameter values empirically, but I think it is possible to calculate the necessary values. Spacing is probably easy - make it dense enough for accurate tiles, but not too dense so that the process does not take too long.
The next step could be counting the number of points and then, assuming that roughly, there is about the same area per point, calculate the number of points per part - depending on requested size of the parts. If you check the areas in my example, you'll see they are around 25,000 sq km. I have 5 km spacing (25 sq km per point), 1000 points per area, which makes 25,000 per part. If you know the total area, and how many parts you need you can calculate the rest.
Will this help?
Dmitri
Hi @srg have found an interesting approaching using longside medial axis to to break a polygon into area driven parts. I have not tackled it in FME (yet). But I will now plant this seed.
http://www.khetarpal.org/polygon-splitting/
And see one of the geometry puzzlers amongst us can report back, (apologies @Mark2AtSafe) I am commandeering an unofficial FME Challenge.
I hope to get some work done and come back and look at this. It should go in the FME Hub this is a useful. If i solve it it will be called the 'AreaShardonnay Transformer' or something equally as silly. So someone else should have a go before that happens :)
Hi @scyphers
Have you been able to translate this logic into FME?
Thanks!
Olivier
Hi @scyphers
Have you been able to translate this logic into FME?
Thanks!
Olivier
@olivier I used the logic provided by Dmitri to accomplish my task. Let me know if you need an example workspace.
happy fme-ing :-)
srg
