How to split a (huge) contour lines shapefile into a grid?

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03-16-2016 07:48 PM
AntoineCantin
New Contributor III

I've been trying to create a raster layer from a really big topo shapfile using Topo to Raster, but it crashes or takes way too long (more than 24h). I'm looking for a way to split the shapefile into smaller parts to mae it easier to generate a few raster layer then joining them. Any clues about how to achieve this? Can anyone help me?

Thanks!

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DanPatterson_Retired
MVP Esteemed Contributor

Other than providing a basic into to creating a featureclass at some stage this tool might be of use

Create Fishnet—Help | ArcGIS for Desktop

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DanPatterson_Retired
MVP Esteemed Contributor

If you have an advanced license Split—Help | ArcGIS for Desktop

otherwise you are going to have to do it via standard clipping, or one of the overlay tools, but you will have to create your boundary shapes to do the subsetting of the larger.  As an alternative, you could subdivide your file by querying contours and exporting those.  This is essentially changing the contour interval, but given your area, you may want to investigate the difference in the interpolated surfaces to see if it is worthwhile in the first place having a dense contour network.  In many situations, reducing the contour interval has less impact on the resultant dem and its terrain derivatives.

AntoineCantin
New Contributor III

To use the split tool, I would need a split feature (I guess that means a grid). How do I create one? Sorry if this is basic, I'm a bit of a newbie...

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DanPatterson_Retired
MVP Esteemed Contributor

Other than providing a basic into to creating a featureclass at some stage this tool might be of use

Create Fishnet—Help | ArcGIS for Desktop

AntoineCantin
New Contributor III

Exactly what I needed. Thanks a lot!

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