gcube

Simulation framework for biodiversity data cubes

https://github.com/b-cubed-eu/gcube

Science Score: 67.0%

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Keywords

biodiversity-informatics data-cubes r r-package simulations

Last synced: 6 months ago · JSON representation ·

Repository

Simulation framework for biodiversity data cubes

Basic Info

Host: GitHub
Owner: b-cubed-eu
License: other
Language: R
Default Branch: main
Homepage: https://b-cubed-eu.github.io/gcube/
Size: 603 MB

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Releases: 18

Topics

biodiversity-informatics data-cubes r r-package simulations

Created almost 2 years ago · Last pushed 9 months ago

Metadata Files

Readme Changelog Contributing License Code of conduct Citation Codemeta Zenodo

README.Rmd

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# gcube 



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The goal of **gcube** is to provide a simulation framework for biodiversity data cubes using the R programming language. This can start from simulating multiple species distributed in a landscape over a temporal scope. In a second phase, the simulation of a variety of observation processes and effort can generate actual occurrence datasets. Based on their (simulated) spatial uncertainty, occurrences can then be designated to a grid to form a data cube.

Simulation studies offer numerous benefits due to their ability to mimic real-world scenarios in controlled and customizable environments. Ecosystems and biodiversity data are very complex and involve a multitude of interacting factors. Simulations allow researchers to model and understand the complexity of ecological systems by varying parameters such as spatial and/or temporal clustering, species prevalence, etc.

## Installation

Install **gcube** in R:

```r
install.packages("gcube", repos = "https://b-cubed-eu.r-universe.dev")
```

You can install the development version from [GitHub](https://github.com/) with:

``` r
# install.packages("remotes")
remotes::install_github("b-cubed-eu/gcube")
```

## Package name rationale and origin story

The name **gcube** stands for "generate cube" since it can be used to generate biodiversity data cubes from minimal input.
It was first developed during the hackathon "Hacking Biodiversity Data Cubes for Policy", where it won the first price in the category "Visualization and training".
You can read the full story here: 

## Example

This is a basic example which shows the workflow for simulating a biodiversity data cube.
It is divided in three steps or processes:

1.  Occurrence process
2.  Detection process
3.  Grid designation process

The functions are set up such that a single polygon as input is enough to go through this workflow using default arguments.
The user can change these arguments to allow for more flexibility.


```{r packages, message=FALSE, warning=FALSE}
# Load packages
library(gcube)

library(sf)      # working with spatial objects
library(dplyr)   # data wrangling
library(ggplot2) # visualisation with ggplot
```

We create a polygon as input. It represents the spatial extend of the species.

```{r polygon}
#| fig.alt: >
#|   Spatial extend in which we will simulate species occurrences.
# Create a polygon to simulate occurrences within
polygon <- st_polygon(list(cbind(c(5, 10, 8, 2, 3, 5), c(2, 1, 7,9, 5, 2))))

# Visualise
ggplot() + 
  geom_sf(data = polygon) +
  theme_minimal()
```

### Occurrence process

We generate occurrence points within the polygon using the `simulate_occurrences()` function.
In this function, the user can specify different levels of spatial clustering, and define the trend of number of occurrences over time.
The default is a random spatial pattern and a single time point with `rpois(1, 50)` occurrences.

```{r simulate-occurrences}
#| fig.alt: >
#|   Spatial distribution of occurrences within the polygon.
# Simulate occurrences within polygon
occurrences_df <- simulate_occurrences(
  species_range = polygon,
  initial_average_occurrences = 50,
  spatial_pattern = c("random", "clustered"),
  n_time_points = 1,
  seed = 123)

# Visualise
ggplot() + 
  geom_sf(data = polygon) +
  geom_sf(data = occurrences_df) +
  theme_minimal()
```

### Detection process

In the second step we define the sampling process, based on the detection probability of the species and the sampling bias.
This is done using the `sample_observations()` function.
The default sampling bias is `"no_bias"`, but bias can be added using a polygon or a grid as well.

```{r detect-occurrences}
#| fig.alt: >
#|   Spatial distribution of occurrences with indication of sampling status.
# Detect occurrences
detections_df_raw <- sample_observations(
  occurrences = occurrences_df,
  detection_probability = 0.5,
  sampling_bias = c("no_bias", "polygon", "manual"),
  seed = 123)

# Visualise
ggplot() + 
  geom_sf(data = polygon) +
  geom_sf(data = detections_df_raw,
          aes(colour = observed)) +
  theme_minimal()
```

We select the detected occurrences and add an uncertainty to these observations.
This can be done using the `filter_observations()` and `add_coordinate_uncertainty()` functions, respectively.

```{r uncertainty-occurrences}
#| fig.alt: >
#|   Spatial distribution of detected occurrences with coordinate uncertainty.
# Select detected occurrences only
detections_df <- filter_observations(
  observations_total = detections_df_raw)

# Add coordinate uncertainty
set.seed(123)
coord_uncertainty_vec <- rgamma(nrow(detections_df), shape = 2, rate = 6)
observations_df <- add_coordinate_uncertainty(
  observations = detections_df,
  coords_uncertainty_meters = coord_uncertainty_vec)

# Created and sf object with uncertainty circles to visualise
buffered_observations <- st_buffer(
  observations_df,
  observations_df$coordinateUncertaintyInMeters)

# Visualise
ggplot() + 
  geom_sf(data = polygon) +
  geom_sf(data = buffered_observations,
          fill = alpha("firebrick", 0.3)) +
  geom_sf(data = observations_df, colour = "firebrick") +
  theme_minimal()
```

### Grid designation process

Finally, observations are designated to a grid with `grid_designation()` to create an occurrence cube.
We create a grid over the spatial extend using `sf::st_make_grid()`. 

```{r create-grid}
# Define a grid over spatial extend
grid_df <- st_make_grid(
    buffered_observations,
    square = TRUE,
    cellsize = c(1.2, 1.2)
  ) %>%
  st_sf() %>%
  mutate(intersect = as.vector(st_intersects(geometry, polygon,
                                             sparse = FALSE))) %>%
  dplyr::filter(intersect == TRUE) %>%
  dplyr::select(-"intersect")
```

To create an occurrence cube, `grid_designation()` will randomly take a point within the uncertainty circle around the observations.
These points can be extracted by setting the argument `aggregate = FALSE`.

```{r grid-designation}
#| fig.alt: >
#|   Distribution of random samples within uncertainty circle.
# Create occurrence cube
occurrence_cube_df <- grid_designation(
  observations = observations_df,
  grid = grid_df,
  seed = 123)

# Get sampled points within uncertainty circle
sampled_points <- grid_designation(
  observations = observations_df,
  grid = grid_df,
  aggregate = FALSE,
  seed = 123)

# Visualise grid designation
ggplot() +
  geom_sf(data = occurrence_cube_df, linewidth = 1) +
  geom_sf_text(data = occurrence_cube_df, aes(label = n)) +
  geom_sf(data = buffered_observations,
          fill = alpha("firebrick", 0.3)) +
  geom_sf(data = sampled_points, colour = "blue") +
  geom_sf(data = observations_df, colour = "firebrick") +
  labs(x = "", y = "", fill = "n") +
  theme_minimal()
```

The output gives the number of observations per grid cell and minimal coordinate uncertainty per grid cell.

```{r visualise-designation}
#| fig.alt: >
#|   Distribution of minimal coordinate uncertainty.
# Visualise minimal coordinate uncertainty
ggplot() +
  geom_sf(data = occurrence_cube_df, aes(fill = min_coord_uncertainty),
          alpha = 0.5, linewidth = 1) +
  geom_sf_text(data = occurrence_cube_df, aes(label = n)) +
  scale_fill_continuous(type = "viridis") +
  labs(x = "", y = "") +
  theme_minimal()
```

### Cubes for multiple species

Each cube simulation function mentioned earlier has a corresponding mapping function.
These mapping functions are designed to handle operations for multiple species simultaneously by using the `purrr::pmap()` function.
Please consult the documentation for detailed information on how these mapping functions are implemented.

| single species              | multiple species                |
|-----------------------------|---------------------------------|
| simulate_occurrences()      | map_simulate_occurrences()      |
| sample_observations()       | map_sample_observations()       |
| filter_observations()       | map_filter_observations()       |
| add_coordinate_uncertainty()| map_add_coordinate_uncertainty()|
| grid_designation()          | map_grid_designation()          |

Owner

Name: B-Cubed
Login: b-cubed-eu
Kind: organization

Website: https://b-cubed.eu
Repositories: 1
Profile: https://github.com/b-cubed-eu

Biodiversity Building Blocks for Policy

Citation (CITATION.cff)

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title: "gcube: Simulating Biodiversity Data Cubes"
authors:
- given-names: Ward
  family-names: Langeraert
  affiliation: Research Institute for Nature and Forest (INBO)
  orcid: 0000-0002-5900-8109
keywords:
- simulation
- data cubes
- B-Cubed
- biodiversity
- Monte-Carlo
contact:
- given-names: Ward
  family-names: Langeraert
  affiliation: Research Institute for Nature and Forest (INBO)
  orcid: 0000-0002-5900-8109
doi: 10.5281/zenodo.14038996
license: MIT
repository-code: https://github.com/b-cubed-eu/gcube/
type: software
abstract: "This R package provides a simulation framework for biodiversity data cubes.
  This can start from simulating multiple species distributed in a landscape over
  a temporal scope. In a second phase, the simulation of a variety of observation
  processes and effort can generate actual occurrence datasets. Based on their (simulated)
  spatial uncertainty, occurrences can then be designated to a grid to form a data
  cube."
identifiers:
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  value: 10.5281/zenodo.14038996
- type: url
  value: https://b-cubed-eu.github.io/gcube/
version: 1.3.7

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      "datePublished": "2025",
      "author": {
        "author": {
          "@type": "Person",
          "givenName": "Ward",
          "familyName": "Langeraert"
        }
      },
      "name": "gcube: Simulating Biodiversity Data Cubes. Version 1.3.7",
      "identifier": "10.5281/zenodo.14038996",
      "url": "https://b-cubed-eu.github.io/gcube/",
      "@id": "https://doi.org/10.5281/zenodo.14038996",
      "sameAs": "https://doi.org/10.5281/zenodo.14038996"
    }
  ],
  "releaseNotes": "https://github.com/b-cubed-eu/gcube/blob/master/NEWS.md",
  "readme": "https://github.com/b-cubed-eu/gcube/blob/main/README.md",
  "contIntegration": [
    "https://github.com/b-cubed-eu/gcube/actions/workflows/check_on_different_r_os.yml",
    "https://app.codecov.io/gh/b-cubed-eu/gcube/"
  ],
  "developmentStatus": "https://www.repostatus.org/#active",
  "keywords": [
    "r",
    "r-package",
    "biodiversity-informatics",
    "data-cubes",
    "simulations"
  ]
}

GitHub Events

Total

Create event: 29
Issues event: 29
Release event: 12
Watch event: 6
Delete event: 15
Issue comment event: 21
Push event: 62
Pull request review event: 5
Pull request event: 33

Last Year

Create event: 29
Issues event: 29
Release event: 12
Watch event: 6
Delete event: 15
Issue comment event: 21
Push event: 62
Pull request review event: 5
Pull request event: 33

Issues and Pull Requests

Last synced: 6 months ago

All Time

Total issues: 46
Total pull requests: 94
Average time to close issues: about 2 months
Average time to close pull requests: 1 day
Total issue authors: 7
Total pull request authors: 11
Average comments per issue: 0.67
Average comments per pull request: 0.5
Merged pull requests: 92
Bot issues: 0
Bot pull requests: 0

Past Year

Issues: 16
Pull requests: 34
Average time to close issues: 23 days
Average time to close pull requests: 1 day
Issue authors: 2
Pull request authors: 2
Average comments per issue: 0.56
Average comments per pull request: 0.32
Merged pull requests: 33
Bot issues: 0
Bot pull requests: 0

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Pull Request Authors

wlangera (85)
peterdesmet (10)
PietrH (9)
sunray1 (6)
avrodrigues (5)
ToonVanDaele (4)
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rociobeatrizc (1)
wbarhdad (1)

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Dependencies

.github/workflows/R-CMD-check.yaml actions

actions/checkout v4 composite
r-lib/actions/check-r-package v2 composite
r-lib/actions/setup-pandoc v2 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

.github/workflows/pkgdown.yaml actions

JamesIves/github-pages-deploy-action v4.5.0 composite
actions/checkout v4 composite
r-lib/actions/setup-pandoc v2 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

.github/workflows/test-coverage.yaml actions

actions/checkout v4 composite
actions/upload-artifact v4 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

DESCRIPTION cran

cli * imports
dplyr * imports
magrittr * imports
mnormt * imports
rlang * imports
sf * imports
stats * imports
testthat >= 3.0.0 suggests

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