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This includes the gradual replacement of manual observers with automated equipment.
There are now 530 automatic weather stations, 490 of which report data every minute.
Creating a modern Australian temperature record from the high volumes of data collected takes a lot of work.
Some of the work requires digitising records from last century—manual data entry from paper-based records to electronic databases.
Other tasks require a great deal of scientific knowledge, such as understanding the impact of technology changes on the consistency of the data over time.
While equipment has been standardised and calibrated by the Bureau since 1908, there have been large changes in technology since that time.
The data from each ACORN-SAT observing location is subject to ten different quality control checks.
The Bureau’s climate data experts have carefully analysed the digitised data to create a consistent—or homogeneous—record of daily temperatures over the last 100 years.
The ACORN-SAT homogenised temperature database comprises 112 carefully chosen locations that maximise both length of record and network coverage across the continent Additionally, the Bureau maintains multiple temperature datasets—analysed in different ways—to provide a consistency check on the accuracy of temperature observations.
Changes in infrastructure also affect the Bureau’s network.
Over time, towns and cities grow, new roads and airports are built, and rural land use changes.
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For more information see Data and networks Among the hundreds of thousands of climate observations recorded in the Bureau’s database each day, it is unavoidable that some records contain errors.