Latest Contributions by BethBrockett

‎05-20-2015

Dear Larry, Thank you. I have not come across GoCAD - but will investigate. Is this software I'd need to carry out the rest of your suggestion? Thanks for clarifying indicator kriging - I assumed it was just used for categorical dependent variables. I will read through your suggested references and see if I can apply this in ArcMap Geostatistical Analyst. I am not very expert at this - so I'm afraid I'll need to do a bit of reading around before I totally understand your second paragraph. Thanks again, your help is much appreciated. Beth

‎05-20-2015

Dear Larry, This is very helpful, thank you. I assume that regression-kriging will need to be carried out outside of the ArcMap Geostatistical Analyst? In a programme such as R? I will certainly post my experiencesof trialing this - in case they help others. Best wishes, Beth

‎05-20-2015

Hello, sorry for any cross postings - I posted this question yesterday but don't think I posted it in the right space. I am using cokriging to model a continuous variable across my study unit (soil carbon). I have one continuous covariable (soil moisture) but also a categorical covariable (vegetation community). I am using the Geostatistical Analyst Wizard to do this. (I ran linear models in R to establish the significant covariables and any transformations required). Am I right in thinking that I can't include the categorical covariable directly into the model? If so, can anyone please suggest a way that I can include this information within a cokriging model? I am using cokriging as it is enabling me to compare the cross validation statistics with and without the covariables. But open to suggestions of other methods which allow inclusion of covariables and provide some idea of model fit, that I can apply in ArcMap. Many thanks

‎05-18-2015

Hello I am using cokriging to model a continuous variable across my study unit (soil carbon). I have one continuous covariable (soil moisture) but also a categorical covariable (vegetation community). I am using the Geostatistical Analyst Wizard to do this. Am I right in thinking that I can't include the categorical covariable directly into the model? If so, can anyone please suggest a way that I can include this information within a cokriging model? I am using cokriging as it is enabling me to compare the cross validation statistics with and without the covariables. But open to suggestions of other methods which allow includion of covariables and provide some idea of model fit. Thank you, Beth

‎02-18-2015

Thank you very much Steve. Sorry, one more question - if you have time? I am using the predicted surfaces as a visual mapping tool to discuss with farmers possible management changes to their farms (I am modelling soil carbon). I assume using this log transformation will give skewed visuals - ie some parts of the range will be more emphasized (visually) than others? (I do understand that I can calculate the true values by back-transforming the predicted ones if I am just looking at the numbers).

‎02-18-2015

Many thanks for this Steve. I am working on 10.2.2 - in the wizard I see that I can choose log but can't see 'logempirical' please can you advise where this option is? Beth

‎02-18-2015

Hello everyone I wonder if anyone can advise how I can set a minimum value for an interpolated surface created by kriging and cokriging? (I want to set a minimum predicted value of zero). I am using the Geostatistical Analyst Wizard to create my model specifications - but may be able to get the modification scripted if necessary. Many thanks, Beth

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Latest Contributions by BethBrockett

Re: Cokriging with a categorical covariable?

Re: Cokriging with a categorical covariable?

Cokriging with a categorical covariable?

Cokriging using categorical covariables?

Re: How to set a minimum value for kriging and cokriging?

Re: How to set a minimum value for kriging and cokriging?

How to set a minimum value for kriging and cokriging?