searsh for GSLIB90, it have more tools than may be you can imagine
----- Original Message -----
From: Chris Howden
Sent: Thursday, October 24, 2002 12:00 AM
Subject: AI-GEOSTATS: block kriging, routines that do this, especially any in Splusor Arch-info
I'm relatively new to this list so if I'm asking a question that has been recently considered sorry about that. I couldn't see any reference to an archive on the web site so I haven't been through that if there is one.
Basically I'd like to know if theres any free-ware block kriging routines. I've been using Arc-Info as my GIS but as we don't have the spatial modelling module I need some additional software. If theres any routines that are compatible with Arc-info that would be great. Failing that some in Splus would be a close second. Failing that anything will do.
For those that are interested I've included a brief statement on what I'm doing with the block kriging. If anyone has any comments on the method we're following these would be cheerfully, and gratefully, considered.
I'm involved in a project that is attempting to develop a map of past tree density. The idea being that this will assist in developing effective natural resource plans in NSW Australia. We're also going to construct a current tree density map for comparison.
We've using data from the original surveys used to carve up Australia by the Europeans. Bascially we've got the distance from each fence cornerpost to the nearest tree, and we've used this to estimate the tree density at that 'point' . So we've got geostatistical data with a series of 'points' estimating density. We don't want to do ordinary kriging since theres some issues with the density estimate (we can't really have a point estimate of density, density requires size). Also, some of the trees are so close to the corner post that the density estimate is way way way to big.
So we decided that block kriging would be a great way to 'average' this problem out.
Thankyou all for your help.
Christopher G Howden
(Work) 02 9895 7130
(Fax) 02 9895 7867
(Mob) 0410 689 945
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