Location: RER - Europe
The inventory refers to 1 productive machine hour (PMS) - referring to the operational time of the machine including breaks up to 15 minutes - of a large skidder with an engine power of 130 kW and a total weight of 12,000 kg.
A skidder is any type of heavy vehicle used in a logging operation for pulling cut trees out of a forest in a process called "skidding", in which the logs are transported from the cutting site to a landing. Here they are loaded onto trucks and sent to the mill. Modern forms of skidders can pull trees with a cable/winch, or a grapple or a clam-bunk. See infrastructure dataset for more details.
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Undefined unit processes (UPRs) are the unlinked, multi-product activity datasets that form the basis for all of the system models available in the ecoinvent database. This is the way the datasets are obtained and entered into the database by the data providers. These activity datasets are useful for investigating the environmental impacts of a specific activity (gate-to-gate), without regard to its upstream or downstream impacts.