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Making a KML LOD grid does not complete after 24hrs

Bungo

Bungo

Messages
115
Country
australia
Can someone run this code and tell me how long it takes as it never completed for me running the 22/10/2016 Dev version of scenProc:

(this is virtually straight from the manual)

Code: 
CreateRectangle|Tasmania
#
SplitGrid|AGN|*
PlacePointAtCenterPolygon|*|String;obj|center|0
AddAttribute|FTYPE="POINT"|String;name|TILELOD
#
MergeGrid
#
ExportOGR|*|KML|grid.kml|grid

The progress bar gets to about 70% and goes no further, but it takes a while to get to that point. It does not get to the point of creating or overwriting the file (if it already exists). Smaller areas work (substitute "Tasmania" with "Hobart" and all works OK.

cheers

Braedon
 
Hi,

Like I mentioned in the other thread I did also see that sometimes for bigger areas it seems to get stuck. If I use a smaller area it works. I think it's a bug in the SplitGrid code. I'll try to reproduce it.
 
Hi,

You do realize you are creating almost 2 million gridcells with this script? I think Google Earth will come to a crawl with that (it was slow with an even smaller area for me already).

But I think I have found a way to optimize the SplitGrid step. I have been able to reduce it to around 3 minutes running time on my PC now for the SplitGrid step. The other steps also take some minutes, but within 15 minutes should be possible. I'll push it to the development release tonight.
 
Hi Arno - my earlier problem with SplitGrid seemed to boil down to the number of vertices contained in the geometry of one of the files I loaded. Does that make sense? However, the coverage area was also massive. I was loading 4 files but took out the file which I felt had too many vertices and SplitGrid ran (slowly) and completed in a decent amount of time - well, at least it didn't hang! :oops:
ian
 
Last edited:
Yes, that can also be the problem. Complex and big polygons take more effort to split.

But here the polygon is just a rectangle with 4 vertices.
 
Braedon,

I'm also not sure why Tasmania returns almost 2 million cells. Sounds like the extends might not be correct, since the area is not that huge. I have to check that later.
 
Hi,

The name search is not so accurate. It uses OpenStreetMap, but the bounding box returned if often quite big. For example for Tasmania you get this:

http://nominatim.openstreetmap.org/search.php?q=Tasmania&polygon=1&viewbox=

Probably due to the island in the south that is part of Tasmania as well.

Similarly for the Netherlands I get a huge area as well, due to some Caribbean islands:

http://nominatim.openstreetmap.org/search.php?q=netherlands&polygon=1&viewbox=

So maybe it is better sometimes to specify the bounding box coordinates yourself.
 
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