NZ monthly enteric methane emissions (2017-2022)

Maps produced for MethaneSAT. Each dataset is an estimate of methane produced by enteric fermentation across different classes of livestock at approximately 1.5 km resolution (pixel length); this is not an equal area projection. Datasets are 12-band raster data where each band is monthly emissions (1=January). "CCTO", "CCPO" and "CCAV" refer to values of livestock carrying capacity determined by the NZLRI.

The data underlying these maps are livestock distribution maps at sub-farm scale. Methane emissions are estimates based on Tier 2 inventory accounting methods. Distributions of livestock are determined through a process that combines Agribase farm counts, pasture productivity and the agricultural production surveys and census.

A slightly more detailed methodology document is included as an attachment.

Note that the output is considerably downsampled from sub-farm scale, using a weighted sum algorithm. This is both by necessity (to sufficiently confidentialise Agribase information), and by design (to match the resolution used in inverse modelling).

Units are kT CH₄ (kilotonnes of methane), monthly total per pixel.

Please acknowledge the funding from the NZ Space Agency through the MethaneSAT Project (C01X2023) which ultimately made this possible.