Software
An official USGS software project is code reviewed and approved at the bureau-level for distribution.
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ReplicateChar package ReplicateChar package
The ReplicateChar package in R language provides functions for visualization and analysis of replicated charcoal counts within a discreet sedimentary horizon. The package consists of 1000+ lines of code and requires Windows OS for full functionality. It also integrates and automates the CharAnalysis.exe software (Higuera et.al) and allows for more efficient run times of high volumes of...
ModelMuse Version 5.1: Software Release ModelMuse Version 5.1: Software Release
ModelMuse version 5.1 updates version 5.0 by adding support for the groundwater transport process and time series files in MODFLOW 6.
A Google Earth Engine Application for Exploring Potential Changes in Design Peak-flow of US Urban Areas Driven by Land Cover Change A Google Earth Engine Application for Exploring Potential Changes in Design Peak-flow of US Urban Areas Driven by Land Cover Change
A Google Earth Engine (GEE) application was developed to explore the spatial distribution map of potential percent change (2020 compared to 1985) of design peak-flow, an average percent change (average of pixels within the selected urban area) as text, and three time-series (1985-2020) charts of design peak-flow for three precipitation frequencies (with three recurrence interval and...
American alligator growth simulation and integrated population model American alligator growth simulation and integrated population model
The software consists of three scripts to be run in the R statistical program: 1) Alligator growth simulation; 2) alligator integrated population model file; and 3) data visualization script. Script #1 produces growth transition probabilities that are used in script #2. The second script uses the outputs from #1 as well as other data files to run an integrated population model. The last...
Integrated population model for red knot in Delaware Bay Integrated population model for red knot in Delaware Bay
This is code for an integrated population model developed to understand the effect of horseshoe crab abundance on population demographics of red knot, an Arctic-breeding shorebird. This model was developed as part of the revision to the Atlantic States Marine Fisheries Commission Adaptive Resource Management Plan for horseshoe crabs.
Optimal horseshoe crab harvest policies via approximate dynamic programming Optimal horseshoe crab harvest policies via approximate dynamic programming
Approximate Dynamic Programming relies on forward simulation of the system, so two population projection models are used, one for crabs and one for red knots. The two models are linked: HSC abundance is a predictor variable in the REKN model. Other useful outputs are produced as well, such as predictions of future harvest.