List Members: Can anyone provide any insight or citations dealing with interpolating ozone (or air pollutants in general) from monitoring station data? Most...
1383
Bob Harrington
bharrington@...
Feb 2, 2004 8:48 am
Here's a reference that might be useful for methodological background and ideas: De Cesare, Myers, and Posa, FORTRAN programs for space-time modeling, ...
1384
lisa pizzol
lisa_pizzol
Feb 2, 2004 8:48 am
Dear list members, I’m using GSTAT to build a 3D semivariogram, I find three directional semivariograms: Direction nug...
1385
Matthias Backes
backes@...
Feb 3, 2004 4:57 pm
Dear Group, I have the problem of comparing two spatial datasets. I have got the pixel values of a satellite image (small scnene of 70x70 metres). I generated...
1386
Edzer J. Pebesma
e.pebesma@...
Feb 5, 2004 8:27 am
... I don't have your data, but think I can more or less reproduce your results. Directional variograms only plot (at least, the should plot) right, currently,...
1387
John Jansen
John.Jansen@...
Feb 5, 2004 8:27 am
Hello all -- I'm in the midst of modeling the distribution of ice-hauling seals in relation to covariates such as day of year (DOY) and ice cover (ICE.COV)....
1388
Steven Citron-Pousty
Steven.Citron-Pousty@...
Feb 5, 2004 8:28 am
A simple suggestion is to see how much "worse" your model fit becomes with a "standard"; variogram model. Having used S+ for this kind of work a while ago I am...
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Brian R Gray
brgray@...
Feb 6, 2004 12:03 pm
John: if by "nested" you mean hierarchical and if what you are working with (some function of what originally were counts) may ostensibly be viewed as normal,...
1390
Edzer J. Pebesma
e.pebesma@...
Feb 6, 2004 12:03 pm
John, the gstat R package/S-Plus library, found at http://www.gstat.org/s.html does provide nested variograms, each having their own anisotropy parameters....
1391
Craig Von Hagen
craig.vonhagen@...
Feb 6, 2004 12:06 pm
Hi, Sorry for the cross-post. I am looking for literature sources of examples of research done in GIS/RS using neural networks or artificial intelligence. I am...
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Harris, Allan
Allan.Harris@...
Feb 9, 2004 10:24 am
Craig Try http://www.spss.com and do a search on the word "neural" Good Luck!!!!!!!! Allan C. Harris - Environmental Engineer Operations Assurance Services...
1393
Volker Bahn
lochapoka@...
Feb 9, 2004 10:26 am
Dear list members, I would like your opinions on my ideas on the definition of "strength"; of autocorrelation as interpreted through a variogram. There seem to...
1394
Rajive Ganguli, Ph.D....
ffrg@...
Feb 9, 2004 10:31 am
Craig, I have done some work with neural networks in the spatial arena. Here is a link to one of my papers that was recently accepted by CIM Bulletin (Journal...
1395
Norrie, Gordon
gordon.norrie@...
Feb 10, 2004 4:14 pm
Dear List Members, I am just writing a quick mail to ask if anyone is aware of a paper by Kyriakidis, P., Shortridge, A, and Goodchild, M.F. published in the...
1396
Isobel Clark
drisobelclark@...
Feb 10, 2004 4:15 pm
Volker I don't understand how you can describe a curve as 'shallow' if you consider the sill to be irrelevant. How do you measure 'shallowness' without a...
1397
Maria N. Morales
maria.morales@...
Feb 10, 2004 4:15 pm
Dear list, I am kriging in 3D using GSLIB library. In p. 27-28 of its user's guide, the rotation angles are defined, as ang1, ang2 and ang3. This angles refer...
1398
seacode@...
Feb 11, 2004 8:10 am
Hi Geostats, Kindly advise me on how to determine the range value from a power-law semi variogram. I am new to geostatistics but I need to analyse sample data...
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Eric Delmelle
delmelle@...
Feb 11, 2004 8:10 am
Dear all This does not relate directly to the previous email. One of the questions that strike my interest across the many emails on the use of kriging and DEM...
1400
Adrian Martinez Vargas
amvargas@...
Feb 12, 2004 8:49 am
I'm working in a new method of estimation, but I have to programming a little, some know the existence of free code in Vbasic, Matlab, C#, or other of some...
1401
Joseph Oyeyele
seacode@...
Feb 12, 2004 8:49 am
Thank you for your reply, By the transect method, I mean by taking a straight line through the field of observation. The transect method computes the variogram...
1402
Mahmut ÇETIN
mcet64@...
Feb 12, 2004 8:49 am
Andrian, In the following web sites, you can find GSLIB source code. http://www.gslib.com/ http://ekofisk.stanford.edu/SCRFweb/supporting/index.html ...
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Jan van de Kassteele
kassteele@...
Feb 13, 2004 8:50 am
Dear all, I am combining yearly averaged observations of NO2 concentration with output from an atmospheric dispersion model for NO2. I do this by applying...
1404
Monica Palaseanu-Love...
monica.palaseanu-love...
Feb 13, 2004 8:50 am
Hi everyone, I would appreciate any light in defining and separating Monte Carlo resampling techniques and bootstrapping techniques. In my search it seems that...
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Ruben Roa Ureta
rroa@...
Feb 13, 2004 8:50 am
... In bootstrapping you create samples which have not been observed directly from samples which have been observed, while in Monte Carlo you create samples...
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Edzer J. Pebesma
e.pebesma@...
Feb 13, 2004 8:50 am
Joseph, not all spatial processes have correlation lengths; some processes show an increase in variance whenever you increase the domain. Think of (1D case)...
1407
marc.ouellette@...
Feb 16, 2004 9:19 am
Hi All, I am trying to determine a good central tendency estimate of the time interval between events that could occur probabilistically over a fixed time ...
1408
Ruben Roa Ureta
rroa@...
Feb 16, 2004 9:19 am
Hi list members: I am now embarked in a project of fish stock assessment in the Falklands using both hydroacoustics and fish density data from trawling, and of...
1409
Tejada Rojas
dora@...
Feb 16, 2004 9:19 am
Hi, I am in the preparation for a research in a monitoring system for forest fragmentation, maybe some of you have seen this article, I would appreciate if you...
1411
Federico Pardo
Federico.Pardo@...
Feb 16, 2004 9:19 am
Ruben: Near the poles, some people use the Gauss-Kruger projection method. It will create 2 new Poles at the Earth Equator and you need to choose what Meridian...
1412
Roger Bivand
Roger.Bivand@...
Feb 16, 2004 9:19 am
On Fri, 13 Feb 2004, Jim Bash wrote: Hold on. hold on! Look, Bergen, Norway is 60N, the Falklands, even with South Georgia, are not even 60S. I protest that...
