Generate Seasonal Timing Rasters from Vector and CSV

Creates "Start of Season" and "End of Season" rasters by rasterizing polygon-specific dates onto a reference template. Polygons are grouped by season name. This is useful for regions with heterogeneous planting dates across different districts or farm plots.

Usage

wapor_vector_to_season_rasters(
  vector_path,
  csv_path,
  template_r,
  vector_id_col = "id",
  csv_id_col = "id",
  season_col = "season_name",
  start_col = "start_date",
  end_col = "end_date",
  crop_col = NULL,
  ref_year = 1970,
  output_folder = "seasonal_masks"
)

Arguments

vector_path

Character. Path to vector file (e.g., .geojson, .shp).

csv_path

Character. Path to CSV file with dates.

template_r

SpatRaster. Template for extent, resolution, and CRS.

vector_id_col

Character. Name of the polygon ID column in the vector layer.

csv_id_col

Character. Name of the matching ID column in the CSV table.

season_col

Character. Column name for the season identifier.

start_col

Character. Column name for the start dates (YYYY-MM-DD).

end_col

Character. Column name for the end dates (YYYY-MM-DD).

crop_col

Character. Optional column name for crop class labels.

ref_year

Integer. Reference year for Julian day calculation.

output_folder

Character. Where to save the generated rasters.

Value

A data.frame mapping season names to their generated raster paths.