|Title||Mean monthly and mean annual days with minimum temperature less than a given threshold (base climatological data sets)|
|Custodian||Bureau of Meteorology|
|Abstract||The grids show the number of days with minimum temperature less than a given threshold. This is referred to as frost potential. The data extends across Australia and is in the form of two-dimensional array data. The indices are based on the period 1976 to 2005.
See LINEAGE below for more information.
|Search Word(s)||Gridded, analyses, temperature, frost, meteorology|
|Geographic Extent Names(s)||Australia|
|General Category||Gridded monthly and annual data|
|General Custodian Jurisdiction||Australian Government
|Geographic Extent Polygon||Not applicable|
|Geographic Bounding Box||See below|
|North Bounding Latitude||-9.975|
|South Bounding Latitude||-44.525|
|East Bounding Longitude||156.275|
|West Bounding Longitude||111.975|
|Stored Data Format||Arc/InfoTM grids - all Australia|
|Available Format Type||ASCII grid-point, Arc/InfoTM grid Interchange (.e00),Shapefiles.|
|Access Constraint||Please note that the copyright for any data supplied by the Bureau of Meteorology is held in the Commonwealth of Australia and the purchaser shall give acknowledgement of the source in reference to the data. Apart from dealings under the Copyright Act 1968, the purchaser shall not reproduce (electronically or otherwise), modify or supply (by sale or otherwise) these data without written permission from the supplier. Please contact us (see details below) for more information.|
|Lineage||The analyses (grids) are computer generated using a sophisticated analysis technique. It incorporates an optimised Barnes successive correction technique that applies a weighted averaging process to the station data. Topographical information is included by the use of anomalies (departures from average) in the analysis process.
On the maps each grid-point represents an approximately square area with sides of about 5 kilometres (0.05 degrees). The size of the grids is limited by the data density across Australia.
This grid-point analysis technique provides an objective average for each grid square and enables useful estimates in data-sparse areas such as central Australia. However, in data-rich areas such as southeast Australia or in regions with strong gradients, "data smoothing" will occur resulting in grid-point values that may differ slightly from the exact minimum temperatures measured at the contributing stations.
|Positional Accuracy||The observational (station) data on which the analyses were based have an associated accuracy of the order of 0.01 degrees (approximately 1km) or better.|
|Attribute Accuracy||Not applicable|
|Logical Consistency||Not applicable|
|Completeness||No missing data|
|Contact Organisation||Bureau of Meteorology|
|Contact Position||Climate Data Services|
|Mail Address||PO BOX 1289, Melbourne 3001, Australia|
|Telephone||(03) 9669 4082|
|Facsimile||(03) 9669 4515|
|Additional Metadata||Additional information available on request (see contact above).|