OffsetSim is an iterative model that simulates the landscape under a set of user-defined offset conservation actions and gains structures to yield an assessment of the gains and losses at the site scale, where the loss of biodiversity from a particular development site is mitigated by an associated gain from one more offset sites, the program scale, comprising all sites in the development-offset program, and the landscape scale, comprising all sites in the landscape, i.e. the sites within the development-offset program as well as those not included. The model requires a set of GIS data layers to be defined as feature layers, as well as a set of response functions that describe the effect of each action on each feature layer. The features can represent any user defined spatial layer including species occupation, habitat types, vegetation classes, environmental domains, ecosystems, and ecosystem services. Actions such as development, protection, restoration etc. are defined and linked to these features. The responses to these actions include the characteristics of the offset action (e.g. the characteristics of the offset restoration function) and are provided as user defined functions.
Download and install the latest version of R. On Ubuntu or another debian-based linux system, this can be done on the terminal as follows:
sudo apt-get update sudo apt-get install r-base sudo apt-get install git
You will then require the R
devtools package in order to install offsetsim. To install
devtools, from inside R do:
To now install the
offsetsim package, from inside R do:
This may take a while as R downloads, builds, and installs the package and all its dependencies.
offsetsim is installed, the easiest way to get started is to generate an offset simulation example that you can customise. To create the user example from inside R do:
This will download the example files (make sure you have an active internet connection) into the directory
./my-osim-example. To now run the example from inside R do:
You can get more information on
offsetsim functionality, from inside R do:
Code should be in a directory called /offset_simulator
Outputs will be written into a directory called /offset_data
offset_data has the following structure:
Within this directory there are the following directories
simulation_runs contains folders numbered sequentially for each run. In each of these numbered folders there will be three folders called
simulation_data is the raw outputs of the simulation, and will only be retained if the appropriate parameter is set (this can take a lot of space).
collated_realisations are processed outputs which can be used to make plots and there is one file per realization. The collated_realisations files have the impacts calculated with all specified counterfactuals.
simulation_params contains the parameter settings and other info used to generated the simulation.
simulation_inputs contains all the processed input data needed to run the simulation (NOTE THIS ONLY APPLIES TO THE LATEST RUN). eg /offset_data/simulated/simulation_outputs/00005 where 00005 is the latest run that has been done.
This script can occasionally create runaway processes if the runs are stopped before completion by the user. By default the script will utilize all available processors on your machine. So if you terminate the script while it's running, it may leave some R processes running. This can be terminated by just quitting R, or manually killing those remaining processes.
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