NEWS

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leastcostpath 2.0.12 (2023-10-09)

• Fixed the updating of extent when using crop_cs

leastcostpath 2.0.11

• modified create_distance_cs to use calculated run distance when assigning distance between cells
• added check_locations argument to create_accum_cost

leastcostpath 2.0.10

• create_lcp now only creates cost column if cost_distance argument is TRUE

leastcostpath 2.0.9

• removed percentile argument in create_slope_cs and replaced with their own cost_function, e.g. "campbell 2019 50"
• Modified how extent is retrieved from a terra SpatRaster. This is now done using terra::ext()
• calculate_distance uses Pythagorean theorem when coordinate system is projected and sf::st_distance when geographic
• removed plot_cf()

leastcostpath 2.0.8

• create_accum_cost now allows for one or more supplied origins. Multiple accumulated cost surfaces will be summarised using a supplied function
• exported calculate_distance, get_coordinates, and neighbourhood functions
• Modified check_locations to stop if any locations are outside extent or not traversable. check_locations also added to functions that are suppplied locations, e.g. create_lcp
• modified create_distance_cs to return conductanceMatrix values that correspond to the supplied spatRaster resolution
• Added vignette
• leastcostpath now allows for both projected and geographic coordinate systems

leastcostpath 2.0.7

• Fixed error when using terra spatVector objects in create_FETE_lcps and create_lcps
• create_accum_cost and create_lcp_density can now take terra spatVector objects
• Removed add_local_stochasticity, calculate_rmse and calculate_slope_variance. These will be amended and re-added at a later date
• Modified create_FETE_lcps to leverage that igraph shortest.paths function is vectorised. This function is now quicker.

leastcostpath 2.0.6

• Modified cost functions "herzog" and "llobera-sluckin" to now be ansitropic, i.e. cost uphill is different to cost downhill
• "Minetti" continues to be isotropic given that downhill slope gradient values are given negative cost values

leastcostpath 2.0.5

• create_lcp now allows for multiple destinations. If supplied least-cost paths will be calculated from a single origin to all destinations
• origin, destination, and locations arguments now accepts sf POINT and MULTIPOINT, terra spatVector, data.frame and matrix objects
• Fixed max_slope argument to 30 degrees within create_slope_cs when using 'campbell 2019' and 'campbell' cost functions
• Added vignette

leastcostpath 2.0.4

• Modified add_dem_error to now allow for different methods. See function details for more information
• Added crop_cs() function to allow conductanceMatrix to be cropped based on extent of supplied object

leastcostpath 2.0.3

• modified calculation of run in cost surface calculations to use base R rather than terra::distance. This now allows for the use of DEMs with more cells without causing memory issues

leastcostpath 2.0.2

• Ensured that Matrix::summary is made explicit rather than rely on using summary from Matrix package.

leastcostpath 2.0.1

• renamed add_stochasticity to add_global_stochasticity
• added add_local_stochasticity
• added add_global_stochasticity
• added calculate_slope_variance
• added calculate_rmse

leastcostpath 2.0.0

• From version 2.0.0 onwards the R package leastcostpath is no longer reliant on the R package gdistance. leastcostpath has been updated to work with sf and terra objects
• create_slope_cs now returns a class conductanceMatrix object. This object contains a record of:

• the ConductanceMatrix
• the cost function argument
• the max slope argument
• whether the slope values were exaggerated
• the critical slope argument
• the percentile argument
• the number of adjacent neighbours used in the calculation

• the cost function argument in create_slope_cs() now allows for cost functions to be stated by name (e.g. 'tobler') or as a function
• update_values() now added
• replace_values() now added
• create_cs() now added
• plot_cf() now added
• rasterise() now added