Skip to contents

sgsR 1.2.0

CRAN release: 2022-08-07

  • fixed - strat_kmeans() bug related to terra where the re-assignment of values to the output raster was causing issues. R Hijmans kindly suggested the edit made.

  • fixed - sample_ahels() - bug where extra attributes in existing would cause the algorithm to crash when re-merging after sampling.

  • fixed - strat_quantiles() no longer plots histogram / scatter plot when using plot = TRUE. Now correctly adds this to details list when details = TRUE.

  • new sampling method - Added sample_nc() based on the algorithm described in Melville & Stone (2016)

    • This algorithm uses kmeans clustering where the number of clusters is equal to the desired number of samples. Cluster centers are located, which then prompts the nearest neighbour raster pixel for each cluster to be located (assuming default k parameter). These nearest neighbours are the output samples. Visualization of the centers and samples can be dispayed if details = TRUE is used and $kplot is plotted.
  • fixed - sample_systematic() now has inherent randomness for lower left corner of the tessellation.

  • fixed - strat_kmeans() solved issue where only first raster layer was being involved in stratification.

sgsR 1.1.0

  • enhanced - sample_strat() - added parameter method that allows users to choose between "Queinnec" (default method implemented in previous sgsR versions) and "random" (stratified random sampling). The random method ignores much of the functionality of the algorithm to allow users to use standard stratified random sampling approaches without the use of a focal window to locate contiguous stratum cells.

  • fixed - sample_strat() factor handling improvement - GitHub issue #18

  • enhanced - calculate_allocation() improved documentation for output data frame to make attributes more clear.

  • fixed - calculate_representation() will now not plot bar chart twice & NA values in existing will not be removed.

  • fixed - existing samples with other attributes will now not break sampling using sample_ahels() / sample_clhs() if values are NA. Variables are also added back to the sample output

sgsR 1.0.0

CRAN release: 2022-06-24

  • First CRAN release.

sgsR 0.1.6

  • Added comprehensive tests using testthat for most functions and covr reporting.

    • Resulting from tests: miscellaneous adjustments to many functions including small non-critical bug fixed, error and message improvements.
  • Changed forceSamp to force in sample_systematic().

  • Removed details from sample_coob().

  • Improved ability to use data.frames() of samples as inputs for numerous algorithms.

  • Improve consistency in error messages and call. = FALSE across the package.

  • Added existingna.shp for example data where point are in NA locations.

sgsR 0.1.5

  • strat_map() can now map categorical srasters (gave an error before). Now also returns the categories associated with the categorical rasters in the lookup table with details = TRUE.

  • Altered error handling for raster masking to be within mask_access() instead of individual sampling functions.

  • Changes to terra::distance() & terra::classify() required slight modifications to calculate_distance() and strat_breaks()

  • sample_strat

    • strat_rule1() and strat_rule2() functions to make code more concise. Fixed issue with mindist not setting distances between strata.
  • sample_ahels()

    • Added tolerance parameter to sample_ahels() to allow users to define a tolerance around the desired sampling ratio (max tolerance = 0.1). This will allow the user to say “I ideally want the ratio to be XX but I’m OK if the ratio is XX - threshold if it means I don’t need to add more samples”.
    • Fix issue where an error occurred when existing was a data frame.
  • sample_ahels made ahels_nSamp() and ahels_threshold() functions to make code more concise.

  • Altered how existing (crosses) and new (circles) samples are plotted in sample_strat() and sample_ahels().

  • Added internal utility functions allocate_prop / allocate_optim / allocate_manual / allocate_equal / allocate_existing / allocate_force and integrated them into calculate_allocation() to make code more succinct and purposeful.

sgsR 0.1.4

  • Fixed issue in calculate_allocation() where too many samples would be allocated (compared to the user-defined nSamp) due to using ceiling() instead of round() during proportional and optimal allocation.

  • Added allocation = "manual" to calculate_allocation(). The parameter weights was added (mandatory for allocation = "manual"), where users can provide a numeric vector of relative weightings to strata. sum(weights) must equal 1.

  • Added weights parameter to sample_strat() to allow for "manual" allocation.

  • Allow buff_inner to be NULL when providing access to isolate samples. This allows users to define only a maximum distance (should they wish to) that samples can be from access but not specify a minimum distance.

sgsR 0.1.3

  • Updates names for internal package data in inst/exdata and corresponding examples and vignettes.

  • Added contingencies for sample_ahels, sample_strat, calculate_allocation, calculate_coobs to allow existing samples to fall in areas of NA and not cause algorithms to fail or bug.

  • extract_metrics & extract_strata produce more robust error messages & will now generate a message if existing samples are co-located with strata or metric values that are NA.

  • sample_clhs updated to fix issue where existing samples would not be appended to output.

  • strat_quantiles now provides a stratum look-up table when details = TRUE to allow user to see exact metric break points.

  • Updated documentation for many algorithms to fix grammatical and spelling errors.

sgsR 0.1.2

  • Removed dependencies for stringr, tidyselect, rlang, RColorBrewer, magrittr, glue, Rcpp.

  • Improved documentation examples to have read speeds in line with <5 seconds for CRAN submission.

  • Improve processing speed for sample_coobs() and utils-mat.R courtesy of Jean-Romain Roussel.

  • Added example subset file to inst/extdata to improve example processing speeds for certain algorithms.

sgsR 0.1.1

  • Added a file to track changes to the package.