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ezylstra / SWParks_Mammal_Occupancy

Using camera trap data to assess occupancy of mammals in Southwestern National Parks

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SWParks_Mammal_Occupancy

Using camera trap data to assess occupancy of mammals in Southwestern National Parks

Currently under development

Dependencies

  • downloader
  • dplyr
  • flextable (for creating reports)
  • geojsonsf
  • ggplot2
  • gridExtra
  • httr
  • knitr
  • leaflet (mapping spatial data)
  • lubridate
  • officedown (for creating reports)
  • officer (for creating reports)
  • raster
  • rmarkdown
  • sf
  • spOccupancy
  • stringr (v 1.5.0 or higher)
  • terra
  • tidyr
  • tidyterra
  • tidyverse
  • tigris (for downloading TIGER road files)
  • tmap (mapping spatial data)
  • unmarked (optional)

We are not currently using JAGS 4.3.1 to run single-season occupancy models, so we don't need to load the jagsUI, coda, or MCMCvis packages to run these analyses. Scripts that use JAGS (to run single-season or multi-season models) can be found in JAGS-labeled folders, but are not part of current workflows.

General workflow

The first step is to organize and format raw photo observation, events, and location data. However, the scripts should only need to be modified once per year after all the photos are processed.

To run a single-season model and estimate occurrence and detection probabilities, you'll need to access files in the src/single-season-models folder. These files will call scripts in other folders (e.g., src/functions.R, src/photo-data/format-mammal-data.R) as needed. Note: we are now using the spOccupancy package to run single-season models.

  1. Open spOccupancy-TEMPLATE.R and run through line 68, where you'll specify the park (PARK), year (YEAR), and species (SPECIES) of interest.

  2. Save this script as: src/single-season-models/YEAR/spOccupancy-PARK-YEAR-SPECIES.R.

  3. Continue running this script from line 68 through the section labeled "Select best model of candidate set". In this part of the script, you'll specify covariates for a set of candidate models, run the models using the spOccupancy package, and create a table comparing model fit. Then you'll select the best model of the set and remove any extraneous covariates in the detection or occurrence part of the model. At the end of this section you'll save the model object to file (in the output/single-season-models folder, the contents of which are not under version control).

  4. Run the rest of the script, beginning with the section "Evaluate best model and look at estimates". Here, you'll assess convergence and goodness-of-fit, produce tables with parameter estimates, generate a figure with predicted occurrence probabilities, and calculate marginal covariate effects.

To run a multi-season (dynamic) model and estimate annual occurrence and detection probabilities, you'll need to access files in the src/multi-season-models folder. These files will call scripts in other folders (e.g., src/photo-dataformat-mammal-data.R) as needed. These are not explicit dynamic models (that estimate colonization and extinction parameters), but instead model annual occurrence probabilities (that can vary as a function of spatial or non-spatial annual covariates). Note: we are now using the spOccupancy package to run multi-season models.

  1. Open spOccupancy-MS-TEMPLATE.R and run through line 62, where you'll specify the park (PARK), years (YEARS), and species (SPECIES) of interest.

  2. Save this script as: src/multi-season-models/PARK/spOccupancy-PARK-FIRSTYEAR-LASTYEAR-SPECIES.R.

  3. Continue running this script from line 63 through the section labeled "Select best model". In this part of the script, you'll specify covariates for various sets of candidate models, run the models using the spOccupancy package, and create tables comparing model fit. Ultimately, you'll select the "best"" model and remove any extraneous covariates in the detection or occurrence part of the model. At the end of this section you'll save the model object to file (in the output/multi-season-models folder, the contents of which are not under version control).

  4. Run the rest of the script, beginning with the section "Evaluate best model and look at estimates". Here, you'll assess convergence and goodness-of-fit, produce tables with parameter estimates, generate figures with predicted occurrence probabilities in the first and last year, and calculate marginal covariate effects.

Directory structure

  • data:
    • covariates: data (typically in rasters) that can be used as covariates in occupancy models
    • locations: information about survey/camera locations
    • mammals: photo and sampling event data (because these datasets potentially include information about sensitive species, some of the raw data are not publicly available)
    • occasions: information about sampling occasions in each park and year (created in delineate-sampling-occasions.R)
  • src:
    • photo-data: R scripts used to organize and format photo and location data.
    • covariate-data: R scripts used to obtain and format covariate data.
    • single-season-models: R scripts used to process/format data, run single-season occupancy models, and interpret/visualize results.
      • 2022: scripts used to run occupancy models for select species in various parks in 2022.
      • JAGS: scripts used to run the models in JAGS (no longer part of the workflow).
    • multi-season-models: R scripts used to process/format data, run multi-season occupancy models, and interpret/visualize results.
      • CHIR: scripts used to run multi-season occupancy models for select species in Chiricahua NM.
      • ORPI: scripts used to run multi-season occupancy models for select species in Organ Pipe NM.
      • SAGW: scripts used to run multi-season occupancy models for select species in Saguaro NP.
      • JAGS: scripts used to run multi-season models in JAGS (no longer part of the workflow.)
    • functions.R: an R script that defines custom functions to be used in any script in the repo.
    • run-single-season-report.R: an R script used to create a word document (via markdown) that summarizes detection data and occurrence models across all species for a given PARK and YEAR. (This script calls various .Rmd files in the src folder)
    • create-single-season-figures.R: an R script used to create and save NPS formatted figures for public-facing versions of single-season reports.
    • map-detection-data: R scripts used to map raw detection data.
  • output: Figures and tables summarizing survey effort and species detection data (some files may not be under version control, but directory structure is).
    • single-season-models: folder that contains output from single-season models run with the spOccupancy package (eg, output from the "best" model for coyotes in SAGW in 2022 would be saved as SAGW-2022-CALA.rds).
    • multi-season-models: folder that contains output from multi-season models run with the spOccupancy package (eg, output from the "best" model for coyotes in SAGW, 2017-2022 would be saved as SAGW-2017-2022-CALA.rds).
    • single-season-reports: folder that contains word documents that summarize detection data and occurrence models across all species for a given PARK and YEAR (eg, SAGW-2022.docx)
    • NPS-figures
      • single-season: pdf versions of NPS-formatted figures that summarize results from single-season models (occurrence probability maps or covariate marginal effects)
      • multi-season: pdf versions of NPS-formatted figures that summarize results from multi-season analyses (occurrence probability maps, covariate marginal effects, maps with species detections or estimated species richness)
    • models-JAGS: R workspaces or objects with output from models run in JAGS
  • JAGS: JAGS model files (.txt files).

Scripts

Scripts used to organize and format photo and location data -- found in the src/photo-data folder (should only need to be modified once per year)

  1. format-mammal-data.R: Import, organize, and clean up photo observation data, events data, and location data (for all sites, years, species).

  2. delineate-sampling-occasions.R: Create a table summarizing sampling occasions (start and end dates, duration) at each park throughout the duration of the study. (this script calls format-mammal-data.R)

  3. summarize-deployments-photos.R: Summarize (and create plots to visualize) when and where cameras were deployed. Create tables with the number of observations of each species, each year. (this script calls format-mammal-data.R)

Scripts used to obtain and format covariate data -- found in the src/covariate-data folder (should only need to be modified if new covariate data are available or in the case of climate data, modified each year if running multi-season models)

  1. create-multi-layer-rasters.R: Create a multi-layer raster for each park that contains all the spatial (time-invariant) covariate data at the same resolution and extent.

  2. get-and-prep-climate-data.R: Download gridMET climate data and create rasters.

  3. get-roads-trails-pois-data.R: Download feature data from NPS or other federal websites.

  4. prep-spatial-covariate-data.R: Process spatial (time-invariant) data to generate rasters for each park.

Scripts used to create detection histories and run single-season occupancy models

  1. spOccupancy-TEMPLATE.R: A template to create a script that will run single-season occupancy models for a selected park, year, and species. (this script calls src/functions.R and several scripts in the src/single-season-models folder [see below])

  2. spOccupancy-data-prep.R: Formats detection and covariate data and packages everything into a list needed to run single-season models in the spOccupancy package. (This script will typically be called from src/single-season-models/YEAR/spOccupancy-PARK-SPECIES-YEAR.R.)

  3. spOccupancy-create-model-formulas.R: Develop formulas for occurrence and detection parts of candidate models. (This script will typically be called from src/single-season-models/YEAR/spOccupancy-PARK-SPECIES-YEAR.R.)

  4. spOccupancy-run-candidate-models.R: Run candidate single-season models (with spOccupancy) and gather model diagnostics and statistics for comparisons. (This script will typically be called from src/single-season-models/YEAR/spOccupancy-PARK-SPECIES-YEAR.R.)

  5. spOccupancy-predictions.R: Calculate predicted occurrence probabilities across a park, and create ggplot objects that depict mean and SDs in each raster cell. (This script will typically be called from src/single-season-models/YEAR/spOccupancy-PARK-SPECIES-YEAR.R.)

Scripts used to create detection histories and run multi-season occupancy models

  1. spOccupancy-MS-TEMPLATE.R: A template to create a script that will run multi-season occupancy models for a selected park, species, and set of years. (this script calls src/functions.R and several scripts in the src/multi-season-models folder [see below])

  2. spOccupancy-MS-data-prep.R: Formats detection and covariate data and packages everything into a list needed to run multi-season models in the spOccupancy package. (This script will typically be called from src/multi-season-models/PARK/spOccupancy-PARK-SPECIES-YEARS.R.)

  3. spOccupancy-MS-create-model-formulas.R: Develop formulas for occurrence and detection parts of candidate models. (This script will typically be called from src/multi-season-models/PARK/spOccupancy-PARK-SPECIES-YEARS.R.)

  4. spOccupancy-MS-run-candidate-models.R: Run candidate multi-season models (with spOccupancy) and gather model diagnostics and statistics for comparisons. (This script will typically be called from src/multi-season-models/PARK/spOccupancy-PARK-SPECIES-YEARS.R.)

  5. spOccupancy-MS-predictions.R: Calculate predicted occurrence probabilities across a park in the first and last year, and create ggplot objects that depict mean and SDs in each raster cell. (This script will typically be called from src/multi-season-models/YPARK/spOccupancy-PARK-SPECIES-YEARS.R.)

  6. map-species-detections.R: Create maps that depict the number of mammal species detected and the estimated number of species that occur in locations throughout the park.

Scripts used to create single-season reports and NPS quality figures

  1. run-single-season-reports.R: Use markdown to create a word document that summarizes detection data and results from occurrence models across all species for a given PARK and YEAR. (This script calls single-season-report.Rmd, single-season-report-spp.Rmd, and single-season-report-marg-figs.Rmd)

  2. create-single-season-figures.R: Create and save NPS formatted figures for public-facing versions of single-season reports.

Scripts used to map raw detection data

  1. map-detection-data.R: Explore how to create maps visualizing where species were detected in a park and given year.

  2. map-detection-multiseason.R: Explore how to create maps visualizing where species were detected in a park in all years.

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Using camera trap data to assess occupancy of mammals in Southwestern National Parks

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