Static gps quality assurance qa.2

1. Static gps quality assuranceqa.2

2. Why Static GPS • It is the most reliable method • There are no orientation errors associated with TPS (total station) • You can do massive distances • It is fast • It is cheap

3. Baselines Baselines make up Static GPS networks. A little logic when performing these and combining 3 or more GPS receivers make for very tight control networks. These are single baselines used to check existing control.

4. Post processing What we do is put up a GPS base and set it to log the satellites, when placing primary control we will use 2 bases to double “polar”. Each point is occupied with a tripod for a length of time depending on the distance from the base, amount of satellites available, geometry of the satellites and cycle slips/obstructions. Post processing is a science and many factors are monitored.

5. Ensuring accuracy • LGO (Leica Geo Office) is the best GPS processing package available on the market, we use it. • The Swiss have employed the worlds finest mathematicians and have refined the algorithms to give astounding results, even up to 300Km, we have tested it.

6. Reports • Our reports are clear and concise • They are in HTML or PDF • You can have confidence at first sight

7. And in the end... • GPS is reliable, but you must use an experienced company • Forget the myths of yesteryear, GPS is the future • European countries now only maintain a few of their Main trig beacons • Ordnance Survey UK only recommend new control taken off their national GPS network. • South Africa also has a GPS network and these can also be used to reference your sites