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Geodetic Transformations Models- the 'Grid Look Up Table' for OSTN02 The OSTN02 (2002) national ‘definitive transformation’ is an accurate realization (conversion) between OSGB36 National Grid and ETRS89 (1989) coordinates. To achieve the re-projection, a 7 parameter (3 shifts, 3 rotations and a scale change) transformation is required. The OSTN02 transformation is modeled as a 1km grid of varying parameters which...

Importing ASCII data onto Leica survey equipment All Leica Geosystems instruments are able to absorb ASCII data, such as .txt and .csv files. Because the data is space/comma/colon delimited, the kit can break up the information into the correct columns. The standard format is 5 columns – Pt Id / Easting / Northing / Height / Code Ensure that the...

Leica GS15 antenna/receiver – All-in-One! For those projects that require a multi-functional GNSS Rover, the GS15 is the most versatile all-in-one hardware package in the Leica Viva arsenal. There are 4 key features we believe make the GS15 stand out from similar products: The GS15 contains both the antenna hardware and receiver software, allowing it to be set-up as a...

RH1200/RH15 – 1-Man working Ranges Even in ideal conditions, we would advise a working distance of no greater than 300m; most often 250m on a busy site, where radio-interference may reduce the expected performance figures. This is down to the output power of the radio, the antenna length and its close proximity to the ground.

Site Heights - Orthometric levels (AOD) with GNSS, not BenchMarks In 2000, the Ordnance Survey formally announced that it was abandoning the traditional BMs in favour of global positioning systems (GPS) plus a datum conversion model (OSGM02). With the national mapping agency of Great Britain no longer recognising BMs, their use ceases to be best practice for height referencing for...