Euclidean Distance in Global Datasets

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02-06-2014 11:58 PM
anTonialcaraz
Occasional Contributor II
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]
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1 Solution

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by Anonymous User
Not applicable
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°.

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3 Replies
by Anonymous User
Not applicable
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°.
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anTonialcaraz
Occasional Contributor II
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
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anTonialcaraz
Occasional Contributor II
Hi Mark,

I applied your procedure on the polyline feature class.

it works very well.

Many thanks
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