[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Gridding/Interpolating a large image
- Subject: Gridding/Interpolating a large image
- From: Ned Horning <nedh(at)lightlink.com>
- Date: Thu, 15 Mar 2001 20:45:20 -0500
- Newsgroups: comp.lang.idl-pvwave
- Organization: WebUseNet Corp http://www.usenetserver.com - Home of the fastest NNTP servers on the Net.
- Xref: news.doit.wisc.edu comp.lang.idl-pvwave:24011
Hi, I am an ENVI user and I would like to create a digital elevation
model from a set of contour lines and cannot figure out how to do this
with ENVI or IDL. When I've done this in the past I did a
vector-to-raster conversion to rasterize the contour data and then ran
an interpolation algorithm to generate the DEM. ENVI has a "Raterize
Point Data" option that seems to do what I want but it requires an
ASCII Point file and I don' know how to convert a vector file to an
ASCII point file. IDL has some interesting gridding and interpolation
options but I'm not sure how to implement them on a large 5000 x 6000
Integer image. My guess is IDL can do this easily but my IDL skills
are not all that sharp.
I have a raster image of the contour lines and now all I need to do is
implement some sort of interpolation. The algorithm I've used in the
past was based on the CONSURF algorithm but I think the
Triangulate/Trigrid routines will work but am not sure how to run it
on a large image.
Any help is appreciated.