xhy your questions are long-standing and as yet unanswered in general. ... I always think of it as focussing a camera. Believe there is a pattern in your data...
1708
xhy
yangxhzsu
Oct 4, 2004 10:09 am
Dear all, I have a question on the selection of the lag classes and lag distance when computing experimental semi-variogram. It has been suggested that the...
1709
Monica Palaseanu-Love...
monica.palaseanu-love...
Oct 5, 2004 7:12 am
Hi, I am wondering if you have any thought on this interpretation: Supposing i have 2 different data sets X and Y. I know that both data sets are actually a...
1710
Feng Liu
asherliu@...
Oct 11, 2004 8:01 am
Dear List: I got a question about the uncertainty associated with the Conditional Stochastic Simulated results, the question is: I have soil C data for a...
1711
Pierre Goovaerts
goovaert@...
Oct 11, 2004 8:02 am
Hi Feng, You are in the ideal situation where it would make sense to separate the two populations and do the variography and simulation separately for each...
1712
Christophe Z Guilmoto
guilmoto@...
Oct 12, 2004 3:37 pm
Hi, I have been trying to compare the autocorrelation of a dataset, using both spatial distance and other non spatial metrics. Yes, non spatial metrics (I'm a...
1713
Edzer J. Pebesma
e.pebesma@...
Oct 12, 2004 3:37 pm
... - there is software that lets you calculate variograms in three dimensions - there is open source software that you can modify for your purpose - you could...
1714
Jakob Petersen
jakob.petersen@...
Oct 12, 2004 3:38 pm
Dear Christophe, Maybe you could use Mantel statistics. You first need a relevant multivariate distance measure (see e.g. Legendre & Legendre 198? "Numerical...
1715
George R Cutter
gcutter@...
Oct 15, 2004 11:41 pm
Dear ai-geostats Members, Are there appropriate statistical tests for determining whether empirical variograms are statistically different (maybe something...
1716
MARTINEZ VARGAS Adrian
martinez@...
Oct 15, 2004 11:41 pm
Hello mail list I have a set of profile of GPR data in format *.rad and *.rd3 where I can download a freeware for convert in e grid? * By using the ai-geostats...
1717
Pat Bellamy
p.bellamy@...
Oct 18, 2004 12:50 pm
Try Lark, R.M. 2000. A comparison of some robust estimators of the variogram for use in soil survey. European Journal of Soil Science 51, 137-157. This paper...
1718
Isobel Clark
drisobelclark@...
Oct 18, 2004 12:50 pm
Mark We have about 13 data sets available on our free download site, ranging from mining data to fisheries, agriculture and environmental stuff. Number of data...
Hello, Try: SCHABENBERGER O & PIERCE FJ (2002) Contemporary statistical models for the plant and soil sciences. CRC Press, Boca Raton, Florida. They compare...
1720
Mark Coleman
mark@...
Oct 18, 2004 12:51 pm
Greetings, I am coding some basic geostatistical estimators, including the variogram, and would like to find some sample data sets for testing. Can someone...
1721
Pierre Goovaerts
goovaert@...
Oct 26, 2004 4:40 pm
Hi Andrew, A critical piece of information is the objective function you want to optimize. I have worked in the field of optimization of sampling design...
1722
Isobel Clark
drisobelclark@...
Oct 26, 2004 4:40 pm
Samuel Practical Geostatistics (1979) Chapter 3. Get it for free at http://uk.geocities.com/drisobelclark/practica.htm Isobel ...
1723
Pierre Goovaerts
goovaert@...
Oct 26, 2004 4:40 pm
Hi Samuel, I have dealt with similar problems when analyzing the spatial distribution of dioxin and other heavy metals in river sediments. Core lengths can...
1724
Dean Monroe
dean.monroe@...
Oct 26, 2004 4:40 pm
Group: I have a sub-set of data that does not appear to be anisotropic, nor does it contain "bad" outliers; however, my kriging of this data errors out the...
1725
Edzer J. Pebesma
e.pebesma@...
Oct 26, 2004 4:40 pm
Two relevant publications mentioned by Carol Gotway during her geoENV keynote (I happen to have them both on my desk right now, but haven't read them yet): ...
1726
Gali Sirkis
donq20vek@...
Oct 26, 2004 4:40 pm
Dear forum members, We are using nested model with geometrical anizotropy to remove artificial imprints connected to high frequency measurement errors along...
1727
local
andrew@...
Oct 26, 2004 4:41 pm
Greetings! I am looking for an efficient geometric design for installing bunch of robots in a field. These sensors(or sensor networks) are not static, in the...
1728
Isobel Clark
drisobelclark@...
Oct 26, 2004 4:41 pm
Dean Couple of possible explanations. Try these for size: (1) you may have points which are very close together if not with identical co-ordinates. Bear in...
1729
samuel verstraete
samuel.verstraete@...
Oct 26, 2004 4:42 pm
Hi, I have a 3D data set that has been sampled by a private company. They lacked a complete knowledge of geostatistics so there is no sampling "strategy";...
1730
Gregoire Dubois
gregoire.dubois@...
Oct 26, 2004 5:03 pm
Dear all, I created a few minutes ago by means of yahoo's facilities a discussion group called AI-GEOSTATS lounge. See ...
1731
bob sandefur
rsandefur@...
Oct 27, 2004 8:21 am
Hi- It has been my habit to fit a variogram models as NUG + SPH + SPH omnidirectionally to get Nugget and two partial sills and then use these values it other...
1732
Dean Monroe
dean.monroe@...
Oct 28, 2004 6:59 am
Thanks to Isobel Clark: I have a sub-set of data that does not appear to be anisotropic, nor does it contain "bad" outliers; however, my kriging of this data...
1733
Volker Bahn
lochapoka@...
Oct 29, 2004 10:51 am
Dear list members, I'm trying to build a spatial simulation model of population dynamics and wanted to ask for your input and suggestions on how to accomplish...
1734
ercan yesilirmak
ercangreenriver@...
Nov 1, 2004 10:17 am
Dear Group members Would you suggest any document on the use of the method MAXIMUM LIKELIHOOD to fit a model to experimental covariogram, preferably at a level...
1735
Dean Monroe
dean.monroe@...
Nov 1, 2004 10:17 am
Group: To add to my previous question, I have a continuous dataset of spectral readings from local crops. Under the idea of spatial continuity I would assume...
1736
Dean Monroe
dean.monroe@...
Nov 1, 2004 10:17 am
Hello Group: Being new to geostatistics I am unsure about the various types and modes of spatial analysis. Is there a way to determine the probability of...
