GPS has come a long way since it was developed by the US Department of Defense. It is not just used for military purposes but also a bunch of things. From navigation to land surveying, GPS is continuing to be part of our lives. Here are the five main uses of this technology:
- Location – Determine a position
- Navigation – Move from one place to another
- Tracking – Monitor a person or object’s movement
- Mapping – Create a detailed and accurate map
- Timing – Take precise time measurements
In the land surveying industry, GPS helps surveyors establish boundaries and produces more accurate results. This system offers accuracy and efficiency as compared to traditional surveying methods. While it offers many benefits, GPS has its share of disadvantages.
Benefits of GPS Surveying
High Level of Accuracy
Generally, GPS offers a higher level of accuracy than other methods. It uses a system or network of satellites to transmit signals. When these GPS satellites broadcast signals in space, you can receive accurate information. High-end users have the option to boost GPS accuracy using dual-frequency receivers and supporting tools. For land surveyors, GPS is extremely handy because it enables fast and accurate data collection.
Quick Calculations
With the help of GPS technology, complex calculations are now made quickly. When the GPS satellites transmit radio signals to Earth, these signals are used to calculate positions and distance. GPS employs a method called trilateration, which finds the location of a specific point on Earth.
Currently, there are 31 GPS satellites in operation. These satellites enable instant data calculations in a matter of minutes. With faster data and coordinates, surveyors can complete projects ahead of schedule.
Available Everywhere
Since it has many satellites, GPS signals are available anywhere. If you need to bring a GPS on-site, you can install it on backpacks and vehicles. This eliminates the use of paper sheets for recording survey data.
Downsides of GPS Surveying
Inaccuracy
GPS devices rely on at least four satellites to calculate location. If the GPS units receive data from three satellites, they might not produce fully accurate information. As the number of satellites decreases, the amount of inaccuracy increases.
Signal Obstruction
Your GPS unit works with the help of signals. A signal failure due to physical obstructions is unavoidable. When this occurs, the GPS signals from the satellites can’t reach the receiver. If there are not enough signals being received, the device may struggle to calculate accurate geospatial data. Interference and poor satellite signal reception can limit function and lines of communication.
Some of the most common obstructions are the following:
- Tall Buildings
- Tunnels
- Mountains
- Trees and Dense Foliage
- Human Bodies
- Clothing
Both natural and manmade structures may block satellite signals. When possible, put your GPS receiver in a place with an unobstructed view of the sky. Some people hold their GPS receiver in a back pocket or on the outside pocket of a backpack.
Extreme Atmospheric Conditions
You might be wondering whether weather conditions affect GPS surveying. The answer is yes and no. When it’s raining or snowing, GPS receivers might receive a weaker signal. During severe atmospheric conditions like geomagnetic storms, large disturbances can occur. A geomagnetic storm is a disturbance in the Earth’s upper atmosphere, specifically the magnetosphere. Magnetic storms happen when a solar wind shock wave hits and interacts with the Earth.
Such disturbance does not have a significant effect on humans. However, GPS navigation and even phone signals are directly affected by magnetic storms.
Battery Failure
Portable GPS units receive and process signals. This process consumes a significant amount of power. One disadvantage of GPS surveying is the possibility of battery failure. Most GPS survey equipment is subject to failure from batteries and system malfunction.
Typically, GPS units can drain the battery in 8 to 12 hours. If you’re out in the field, you need a backup or replacement once the device runs out of power. Low battery levels will lead to poor signal reception on your device.
Conclusion
When used properly, GPS can provide faster and more accurate data for land surveying. This is a proven way to map and model different landscapes and structures. For a wide array of surveying services, reach out to Pittsburgh Land Surveyors.
Our company provides a wide range of services for all sorts of clients. Don’t hesitate to contact us for more information.
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