cdmAmsIIIg implements the Clean Development Mechanism (CDM) small-scale methodology AMS-III.G Landfill methane recovery. The package follows tidyverse design principles and exposes equation-level helpers, applicability diagnostics, and workflow orchestration utilities to reproduce emission reduction estimates for landfill gas recovery projects.
# install.packages("devtools")
devtools::install_github("independent-impact/GHG_methodologies/cdmAmsIIIg")
library(cdmAmsIIIg)
library(dplyr)
simulated <- simulate_ams_iiig_dataset(n_sites = 2, n_periods = 3, seed = 2025)
applicability <- check_applicability_landfill_characteristics_iiig(simulated$applicability, group_cols = "site_id") %>%
left_join(
check_applicability_gas_management_iiig(simulated$applicability, group_cols = "site_id"),
by = "site_id"
) %>%
left_join(
check_applicability_monitoring_framework_iiig(simulated$applicability, group_cols = "site_id"),
by = "site_id"
)
reductions <- estimate_emission_reductions_ams_iiig(
baseline_data = simulated$baseline,
project_data = simulated$project,
leakage_data = simulated$leakage,
group_cols = "site_id",
baseline_args = list(days_col = "days_in_period"),
project_args = list(days_col = "days_in_period")
)
applicability
reductionsFor a more detailed walk-through see the vignette in vignettes/cdmAmsIIIg-methodology.Rmd.
Projects must satisfy core AMS-III.G requirements before emission reductions can be claimed. Use the package helpers to document each criterion:
check_applicability_landfill_characteristics_iiig() – verifies landfill management status, biodegradable waste fraction, and readiness for gas well installation.check_applicability_gas_management_iiig() – confirms compliant destruction/utilisation technologies, minimum operating hours, and redundancy.check_applicability_monitoring_framework_iiig() – ensures monitoring plans include sufficient flow, methane fraction, and calibration measurements.cdmAmsIIIg translates the numbered equations from AMS-III.G into composable R functions:
| Equation | Function | Description |
|---|---|---|
| (1) | calculate_baseline_methane_emissions_iiig() |
Estimates baseline methane emissions released without gas recovery. |
| (2) | calculate_project_emissions_iiig() |
Converts project methane capture, destruction, and energy inputs into project emissions. |
| (3) | calculate_leakage_emissions_iiig() |
Aggregates transport, residual waste treatment, and displacement impacts. |
| (4) | calculate_emission_reductions_iiig() |
Computes net emission reductions after project and leakage adjustments. |
The meta-wrapper estimate_emission_reductions_ams_iiig() chains these helpers together for tidyverse-friendly datasets.
aggregate_monitoring_periods_iiig() summarises measured data across reporting periods while preserving entity identifiers.simulate_ams_iiig_dataset() generates example datasets with monitoring metadata to support tests, demos, and onboarding.