#BENCHMARK MEANING ARCHIVE#
This data, which is no longer maintained, is available for use under Open Government Licence terms.ĭownload the complete benchmark archive as a zipped CSV (12 Mb).
#BENCHMARK MEANING DOWNLOAD#
The FBMs do not currently appear in search results but are included in the archive CSV file to download below. They are used in the creation of the orthometric to GPS height correction model (OSGM15). They form our primary height network and, as such, are our link to the Ordnance Datum at Newlyn. These are still maintained and are still used by Ordnance Survey. There are approximately 190 FBMs, which as the name suggests are our high-accuracy BMs. The BM heights shown have not been maintained for 30 years and should not be relied upon to accurately define ODN. This number is reducing due to property development, road widening and so on. There are approximately 500 000 'lower order' BMs still remaining. As long as your system configuration remains the same, the benchmarks give an accurate reading of the in-game performance you’ll get.
These tests provide a repeatable test environment. This method achieves the most accurate and uniform method of heighting. Use in-game benchmarks to check the CPU’s effect on FPS (frames per second) during regular gameplay and also while streaming. Global Positioning System (GPS) and the OSGM15 TM model (the height transformation between the European Terrestrial Reference System 1989 and the national height datums) is the preferred method of heighting used by Ordnance Survey. The Monetary Policy Committee (MPC) of the Central Bank of Nigeria (CBN) has voted to increase the benchmark interest rate by 50 basis points to 18. They are a useful basis for all kinds of financial contracts such as mortgages, bank overdrafts, and other more complex financial transactions. These have no link in to ODN and must be treated the same way as the mainland levelling. Interest rate benchmarks also known as reference rates or just benchmark rates are regularly updated interest rates that are publicly accessible. On some of the offshore islands there are local mean sea level datums. In these regions the BMs cannot be relied upon to accurately define ODN. The network has had little maintenance for 30 years, and in some areas (mining areas for example), subsidence has affected the levelling values. From these FBMs tens of thousands of lower-order BMs were established. ODN is realised on the ground by a network of approximately 190 fundamental bench marks (FBMs). Although the main network is no longer being updated, the record is still in existence and the markers will remain until they are eventually destroyed by redevelopment or erosion.īench marks are the visible manifestation of Ordnance Datum Newlyn (ODN), which is the national height system for mainland Great Britain and forms the reference frame for heights above mean sea level. Most commonly, the BMs are found on buildings or other semi-permanent features. If the exact height of one BM is known, the exact height of the next can be found by measuring the difference in heights, through a process of spirit levelling. Ordnance Survey Bench marks (BMs) are survey marks made by Ordnance Survey to record height above Ordnance Datum.
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