topic Euclidean Distance in Global Datasets in Geoprocessing Questions

Euclidean Distance in Global Datasets

anTonialcaraz — Fri, 07 Feb 2014 07:58:09 GMT

Hi,

I need to do some euclidean distance on a global scale. I find that there is no a natural continuation at the edges due to the Maximum distance option set to default. I've tried with different values always with the same output.

I wonder if someone can suggest a way round this so I can get a continuous raster dataset instead of a sharp differentiation at the edges.

Please see images attached.

Many thanks

[ATTACH=CONFIG]31207[/ATTACH]

[ATTACH=CONFIG]31208[/ATTACH]

[ATTACH=CONFIG]31209[/ATTACH]

Re: Euclidean Distance in Global Datasets

Anonymous User — Fri, 07 Feb 2014 13:35:27 GMT

Original User: mdenil

Slice 90° (or so) chunks off the far eastern and western ends
and save them out as rasters.
Shift the coordinates on each,
so each will mate up to the oposite end of the original.
mosaic them all to a new raster
you will have a raster with an east-west extent of 540°
(that is: -270° to 270° from 90° + 360° + 90°)
Run your analysis.
Now clip the resuslts to the rectangle -180° to 180°.

Re: Euclidean Distance in Global Datasets

anTonialcaraz — Fri, 07 Feb 2014 14:43:36 GMT

Thanks Mark,

I get a bit confused when you say "Run your analysis".

Would it make sense to do what you're suggesting on the source polyline country layer (attached image) and then run the Euclidean distance tool?

Cheers

Re: Euclidean Distance in Global Datasets

anTonialcaraz — Mon, 10 Feb 2014 09:14:23 GMT

Hi Mark,

I applied your procedure on the polyline feature class.

it works very well.

Many thanks