spatial.align

Overview

spatial.align is an R package providing functions for spatial data alignment and verification. This package includes the align and verify_properties functions, designed to facilitate spatial data pre-processing tasks. It is based on the Raster Alignment tool from QGis (QGIS User Manual on Raster Analysis). This package is helpful when being provided with a raster file bigger than your study area. The raster file can then be aligned with a your smaller study area.

Installation

You can install the package directly from GitHub using the devtools package:

# Install devtools if you haven't already
install.packages("devtools")

# Install spatial.align from GitHub
devtools::install_github("RikLubbers/spatial.align")

Functions

align

Aligns spatial data based on specified parameters, including CRS, extent, cell size, and grid offset, using a provided base layer.

Usage

align(spatial_data, base_layer, resample_method = "bilinear", show_plots = FALSE, verbose = TRUE, output_file = NULL)

Arguments

• spatial_data: A spatial object to be aligned.
• base_layer: A spatial object to use as a reference.
• resample_method: Method for resampling cell values. Defaults to "bilinear".
• show_plots: Whether to create and display before and after plots. Defaults to FALSE.
• verbose: Whether to provide detailed logging. Defaults to TRUE.
• output_file: Optional. A file path to save the aligned spatial data.

Value

Returns a spatial object aligned with the base layer's CRS, extent, cell size, and grid offset.

Examples

aligned_spatial_data <- align(spatial_data = spatial_data1, base_layer = spatial_data2, resample_method = "bilinear", show_plots = TRUE)

verify_properties

Checks the properties of two spatial objects, such as CRS, extent, resolution, and data type, and provides a comparison summary.

Usage

verify_properties(spatial_data1, spatial_data2)

Arguments

• spatial_data1: A spatial object to be compared.
• spatial_data2: A spatial object to be compared against.

Examples

verify_properties(spatial_data1, spatial_data2)

Example

# Load the package
library(spatial.align)

# Example usage of align function
aligned_spatial_data <- align(spatial_data = spatial_data1, base_layer = spatial_data2, resample_method = "bilinear", show_plots = TRUE)

# Example usage of verify_properties function
verify_properties(spatial_data1, spatial_data2)

Contributing

Contributions are welcome! Please submit pull requests or open issues to discuss potential changes.

License

This project is licensed under the MIT License.