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targets example

This branch has a targets example in _targets.R.

The old sequential update runner has been moved to R/archive/__RUN_UPDATES.R. The current update workflow is defined as staged targets:

  • online source checks and downloads
  • preprocessing
  • combined coverage and multitemporal processing
  • maps and tables
  • Quarto website rendering

The dated output version is controlled explicitly with COVERAGE_VERSION. The New Brunswick lidar index is checked online using HTTP headers from the GeoNB SHP ZIP download. The ZIP is downloaded and unzipped only when the remote ETag, Last-Modified, or Content-Length changes.

Useful commands:

install.packages("targets")

Sys.setenv(COVERAGE_VERSION = "20260421")
targets::tar_manifest()
targets::tar_make()
targets::tar_read(processing)
targets::tar_outdated()

You can also source R/__RUN_TARGETS.R. Edit the coverage_version value in that script, or set COVERAGE_VERSION first.

The main idea is that targets tracks scripts, input files, output files, and the version parameter. If none of those change, completed stages can be skipped on the next run.

To clean the local targets cache:

targets::tar_destroy()