Use of Ashtech MobileMapper GNSS system in forestry applications

In the continuously developing GIS market, forestry applications and, in general, no-geodetic users poses more demanding requirements. Customers are primarily asking for better accuracy: in network management applications (water distribution, telecommunications or electricity, …), sub-meter accuracy is just not enough. Extended position availability is also becoming a strong requirement: being unable to run GIS projects in obstructed areas because of a lack of reliable positions due to adverse reception conditions is simply unacceptable. In parallel, as the number of specific GIS applications increases, customers are asking for more processing power, higher-quality screens and truly "handheld-operated" receivers. In 2012 Ashtech® introduced the MobileMapper® 120 to give the answer to all these requirements (Ashtech, 2013). The MobileMapper 120 comes in a lightweight, compact, ruggedized, Windows® Mobile handheld platform. It is fitted with a powerful processor, a large full daylight- compatible color touch screen, a cellular modem and Bluetooth connection. Moreover, this instrument offers an high level of accuracy using its internal antenna. This paper details the level of accuracy that can be expected from the MobileMapper 120 in various situations, specifically in forestry (Breshears et al., 2005; Shaw, 2005, Ghosh et al, 2012).