[postgis-users] Has anyone considered interpolation of sparse point networks?

[Gerry Creager N5JXS]

Steve,

Thanks.  That's along the lines I was thinking, but it really helps 
crystalize my thinking.

I'll report back.
Gerry

Stephen Woodbridge wrote:
> Gerry,
> 
> I have done something similar in the past where I have used the points 
> to create a triangularized 3D surface, using the scalar at the vertices 
> as the Z value, then you can quickly and easily contour the 
> triangularized surface by intersecting the triangles with Z-planes and 
> collect the intersection lines into polylines.
> 
> If you search the web for triangular surface algorithm You should find 
> some code that allow you to insert you point into a plan and have it 
> develop a surface. Once this is down slicing the triangles is trivial, 
> an then you need to collect the intersections fragments into a polyline(s).
> 
> Does PostGIS have any tools to assist in these steps?
> 
> -Steve W.
> 
> Gerry Creager N5JXS wrote:
> 
>> I'm getting a dataset on a daily basis that we're putting into 
>> PostGIS.  It's a triangulated irregular network (although others will 
>> be quadrilateral irregular networks, or irregular polygons) with a 
>> scalar at the vertices.
>>
>> I will be saving these in PostGIS, and as part of the visualization 
>> process (I'll also post appropriate questions toward the Mapserver 
>> list) we're going to need to interpolate to create a processed, 
>> synthetic dataset of contours.
>>
>> This seems like it should be straightforward, but I'm having a little 
>> trouble organizing a strategy and getting started.
>>
>> Has anyone else looked at this sort of problem and done something 
>> similar?
>>
>> Thanks,
>> Gerry
> 
> 
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-- 
Gerry Creager -- gerry.creager at tamu.edu
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