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*Subject*: Re: TRIANGULATE/TRIGRID problem in IDL 5.3 (SGI)*From*: Ben Tupper <pemaquidriver(at)tidewater.net>*Date*: Fri, 20 Apr 2001 18:44:46 -0400*Newsgroups*: comp.lang.idl-pvwave*Organization*: http://extra.newsguy.com*References*: <3ADF1226.EF649510@ssec.wisc.edu> <onsnj48x8v.fsf@cow.physics.wisc.edu> <3ADF9A16.92749649@tidewater.net> <3AE05019.9BF7AF1D@wizard.net>*Xref*: news.doit.wisc.edu comp.lang.idl-pvwave:24649

James Kuyper wrote: > Ben Tupper wrote: > ... > > IDL's TRIGRID routine interpolates out to the limits of the 'outer-hull' > > defined by the Delaunay triangulation. The curviness of the data swath > > (almost banana-shaped) has introduced a subtle concavity. There is a triangle > > This data set sounds familiar to me. Is it MODIS data from the Terra > satellite? If so, then I'm the one responsible for the program that > generates the geolocation information Liam's using. In that case, it's > not really a banana shape. Seen in a proper 3-D context, without map > distortion, it's actually a bow-tie shape - the edges are actually arcs > of what in spherical geometry are called "small" circles: they have > radii of less than 90 degrees, bending inward. Aha! A hyper-banana! Ben -- Ben Tupper 248 Lower Round Pond Road POB 106 Bristol, ME 04539 Tel: (207) 563-1048 Email: PemaquidRiver@tidewater.net

**References**:**TRIANGULATE/TRIGRID problem in IDL 5.3 (SGI)***From:*Liam E. Gumley

**Re: TRIANGULATE/TRIGRID problem in IDL 5.3 (SGI)***From:*Craig Markwardt

**Re: TRIANGULATE/TRIGRID problem in IDL 5.3 (SGI)***From:*Ben Tupper

**Re: TRIANGULATE/TRIGRID problem in IDL 5.3 (SGI)***From:*James Kuyper

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