Facilitating GPS Survey – Things to Consider When Buying GPS Survey Equipment
One of the best thing when you use GPS survey is that you need not check out the inter-visibility among the different points where the measurements are to be recorded. Traditional methods had to keep the instruments in such places where the one person (at a distant point) can view the other person (from where the distance was to be measured, for instance) so that the equipment could work properly. This required designing the project in a way that nothing gets in between the two points. With the GPS, the GPS survey equipment can receive signals and hence, positional data, directly from GNSS satellites. This eliminates the need for extensive designing.
Though a design is still required in GPS survey, it is more optimal as you do not have to use too many points for measurements and you can select the most optimum points irrespective of the terrain. This is the basis, basics, advantage (or whatever you may call) of GPS survey.
However, to achieve this, you need to focus on GPS survey equipment that is designed to obtain proper accuracy of GPS irrespective of signal strength. One such GPS instrument can be the one based on WAAS principles. There are plenty of GPS devices available that are capable of enhancing the noise to signal ratio thereby decreasing error probabilities.
Another important thing in land survey is the position of the point and its elevation. This means you need a GPS device that can get data about all three planes in Physics (X, Y, and Z planes). This in turn requires a GPS surveying equipment capable of receiving 3D information from the satellites.
The accuracy of GPS and reduction of GPS measurement errors is yet another factor to be considered for GPS surveying. The reduction of errors can be achieved by receiving signals from at least two satellites – received and computed by two receivers – for determining the average. It is clear that the GPS survey equipment with two receivers will be able to offer greater accuracy of GPS data for enhanced precise surveying results.
Among other factors are the memory considerations, warm-up time, and operational ease of the GPS surveying equipment. As there are no standards set for GPS survey as of now, surveyors can go shopping on the Internet to find the GPS handheld which serves both as a personal gear plus as useful GPS surveying equipment that falls within their budget. (The linked article contains reviews of three most popular GPS handhelds that also double up as GPS surveying equipment).