## Spatial Models ## This wiki contains questions related to the second stage of traditional density surface modeling, which is the spatial model. Typically, this is a generalized additive model that relates abundance observed on segments of a line transect survey to covariates, which often include an explicit spatial term (a 2D smooth of x and y coodinates) and environmental variables believed to relate to the habitat of the modeled taxon. The kinds of questions that appear here reflect this approach. The questions and their answers are grouped by topic. Select a topic below or from the alphabetical list in the left navigation bar. - [Splitting transects into segments][1] - [Covariates: which should I use?][2] - [Covariates: steps and tools for acquiring][3] - [Covariates: transformations and outliers][4] - [mgcv: distributions][5] - [mgcv: model selection][6] - [mgcv: diagnostics][7] - [mgcv: soap film smoother][8] - [Predictions: summarizing][9] - [Predictions: validating][10] - [Unidentified and ambiguous sightings][11] ## How to cite this FAQ To obtain a citation, go to the [main project page](https://osf.io/5eza8) and click the Citation dropdown. ## Contact us To ask a question or suggest material for this FAQ, please contact [Jason Roberts](mailto:jason.roberts@duke.edu). [1]: https://osf.io/wgc4f/wiki/Splitting%20transects%20into%20segments/ [2]: https://osf.io/wgc4f/wiki/Covariates:%20which%20should%20I%20use%3F/ [3]: https://osf.io/wgc4f/wiki/Covariates:%20steps%20and%20tools%20for%20acquiring/ [4]: https://osf.io/wgc4f/wiki/Covariates:%20transformations%20and%20outliers/ [5]: https://osf.io/wgc4f/wiki/mgcv:%20distributions/ [6]: https://osf.io/wgc4f/wiki/mgcv:%20model%20selection/ [7]: https://osf.io/wgc4f/wiki/mgcv:%20diagnostics/ [8]: https://osf.io/wgc4f/wiki/mgcv:%20soap%20film%20smoother/ [9]: https://osf.io/wgc4f/wiki/Predictions:%20summarizing/ [10]: https://osf.io/wgc4f/wiki/Predictions:%20validating/ [11]: https://osf.io/wgc4f/wiki/Unidentified%20and%20ambiguous%20sightings/