Challenges to capturing data:
Field crews are faced with many challenges and difficulties when it comes to GIS data collection. The use of GPS in mapping is a powerful tool, but there are times when it has its limitations. Often the GPS satellite signal is blocked by obstructions such as trees, steep terrain or high-rise buildings. Additionally, a GPS receiver is inherently designed to compute the locations of its antenna. This means that in order to capture the location of a feature, you need to occupy that location. This is not always safe or practical when positioning features such as a gauging station in the middle of a stream or a manhole in the middle of the street.
Measuring with GPS Laser Offsets
Offsets: Making the job easier and safer
The ability to apply offsets to features by recording both a GPS position and an associated distance and direction to the object of interest is very useful in challenging situations.
For example, suppose you wish to record the attributes of a tower that is on the other side of a steep, narrow ravine. Rather than risk injury climbing across the ravine, you can use the offset capability to stand and record the position at one side of the ravine then simply record the offset to the tower on the other side.
The entry of offset information can be estimated without measurement tools or obtained more accurately from a laser positioning system.
Map GPS Laser Offsets Easier and Safer
By integrating a laser rangefinder and an electronic compass (providing distance, inclination and azimuth) with your GPS, you can significantly reduce travel time associated with field data collection by eliminating the need to physically occupy every point.
The offset function allows you to stay at one location and record the offsets and attributes of hundreds of features before moving to the next location to do the same.
Whether you are in need of 2D or 3D measurement, it is important that the laser rangefinder has the ability to measure a vertical angle and output horizontal distance. This will provide the most accurate positioning for 2D data and would also allow the you to gather 3D data if needed.
Streamline your Field Data Collection
Using LTI's LaserGIS for ArcPad® and TruPulse laser rangefinders you can streamline your GIS field data collection. No need to physically occupy the location and enhance your laser offset functionality with this powerful combination. Get the data you need and map safer, quicker and easier.
Benefits of Offsets in GPS Data Collection
GPS Laser Offsets Benefits
- Makes data collection easier in hostile environments.
- Decreases safety liabilities in dangerous situations.
- Reduces travel time to sites and objects.
- Allows you to record offsets and attributes of hundreds of features from one location.
- Eliminates extra manpower needed to collect data.
- Saves time, money and resources.
Examples of Laser Offset Applications
- Mapping location of objects in steep terrain.
- Safe recording of data near busy highways.
- Mapping of gauging stations in middle of streams.
- Mapping of manholes and other features located in the middle of the street.
- Positioning features where the GPS signal is blocked by buildings or trees.
- Mining applications such as stockpile volume, general mapping & face profiling.
- Mapping features which are on private property.