Group Information- Members: 153
- Category: Ecology
- Founded: Aug 27, 2003
- Language: English
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Description
GRASP stands for Generalized Regression Analysis and Spatial Prediction.
The GRASP user group is intended to connect GRASP users from around the world so that they can share their experience, problems and solutions.
GRASP is based on Generalized Additive Models (GAM), a non parametric regression method, to build spatial predictions from point surveys. Unlike spatial interpolation, GRASP is essentially based on vertical relationships between multiple predictors.
GRASP-S was built with Splus and GRASP-R with R !!!
More information on GRASP can be found at http://www.unige.ch/ia/climate/grasp
REFERENCES:
Lehmann, A., Overton, J. M. C. & Leathwick, J. R., 2002. GRASP: Generalized Regression Analysis and Spatial Predictions. Ecological Modelling, 157: 189-207.
Overton, J. M., R. T. T. Stephens, J. R. Leathwick, and A. Lehmann. 2002. Information pyramids for informed biodiversity conservation. Biodiversity and Conservation 11:2093-2116.
Maggini, R., A. Lehmann, N. E. Zimmermann, and A. Guisan. 2006. Improving generalized regression analysis for the spatial prediction of forest communities. Journal of Biogeography 33:1729-1749.
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Re: Categorical variable as a grid?
Hello! I think it is necessary to convert the shape-files into GRID files as the GSASPIT extension in ArcView GIS reads the values from GRID files. once you
Posted - Sat Dec 5, 2009 1:05 pm
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zafeer
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Re: Using covariables
Hi Lior, You may not be able to do it in grasp, but if you look at the use of an offset term in any GAM or GLM model, you will find that you can fix one
Posted - Sun Apr 5, 2009 10:00 pm
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John Leathwick
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Using covariables
hi GRASP users, i was wondering if there is any way i can partial out variables using GRASP. meaning to use some of the variables as covariables in order to do
Posted - Sun Apr 5, 2009 3:57 pm
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Lior Blank
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problem using GRASP .lut in ArcView3.2
hi GRASP users, I'm having a problem trying to run a spatial prediction in ArcView3.2 using a look up table created in GRASP. I ran a GAM successfully in
Posted - Wed Jan 21, 2009 4:24 pm
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mccauley.stephen
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Re: Categorical variable as a grid?
Hi Hillary For analysing the data statistically in GRASP, you have to adopt a predictor value to each georeferences point in your responce dataset. If you have
Posted - Sat Dec 6, 2008 3:29 pm
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trine.bekkby@...
trinebekkby
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