Setting up for modeling

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Presentation transcript:

Setting up for modeling Remember goals: Desired model and uncertainty Sample area selection What resolution will we model at? What are we modeling? How will we validate the model? Do we have enough sample data or too much? Do we have the predictor variables we need?

Sample Area Selection What is the area of interest? How was the area sampled? Optimal: rigorously sampled, randomly spaced plots Worse case: data integrated from multiple sources with little documentation on collection methods How far can we extent the study area realistically? Best to pad the extent a bit

Sample Area Selection CA – Douglas fir

Sample Area Selection CA – Redwood (coastal)

Sample Area Selection CA - Giant Sequoia

Resolution Higher resolution: Lower resolution: Recommendation: Better detail Can be misleading Performance problems Lower resolution: Much faster processing Can hide “niche environments” Recommendation: Use lowest predictor layer resolution for all layers, or lower Grid to lower resolution as needed

What are we modeling? Need a relationship we can model Measured variables: Height, DBH, Canopy size Weight, length, grain size, proportion Income, longevity Presence/Absence: Logistic regression Occurrences: Point Density?

Sample Data Too many points will overwhelm R Sub-sample Aggregate Too few points will not represent the phenomenon Get more data? Switch to a simulation Give up?

Predictors Look far and wide Transform predictors as needed Investigate what will predict the phenomenon Visit the site, talk to “experts” Switch to a simulation? Give up?