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GPS stands for Global Positioning System and is a highly accurate navigation system using signals from satellites to determine a location on the Earth's surface, irrespective of weather conditions.

Surveying and Mapping.   GNSS / GPS System

Your GPS needs to be able to “see” at least four satellites. Trees or tall buildings can block your GPS’s line of sight, and GPS isn’t suited for indoor surveying. In such situations, an optical total station may be more cost-effective.
 
Depending on your application, you can choose from several measuring techniques:
 
For long lines, geodetic networks, or tectonic plate studies, use static measuring. It’s extremely accurate over long distances, but slower than other methods.
To establish local control networks, network densification, or related jobs, use rapid static measuring. Also highly accurate for baselines up to 20 kilometers, rapid static is much quicker than static measuring.
 
If you’re doing detail surveys or measuring many points close to each other, kinematic measuring may be your best bet. This depends on whether your instrument can see four satellites in the clear. Otherwise, you’ll need to reinitialize, which can take between 5 and 10 minutes – unless your GPS has on-the-fly processing capabilities.
 
Another technique is real-time kinematic (RTK), which uses a radio data link from the satellites to the reference receiver and on to the rover. This allows for real-time measurements, as long as there’s no radio interference or line-of-sight blockage. RTK is useful for detail surveying, stakeout, and COGO applications.
 
Static measuring is the original GPS surveying technique. To measure a long baseline (20 km/16 mi and up), place the reference receiver at a known point. Next, place a second receiver (called the “rover”) at the other end of the baseline. Then, set identical data recording times – usually 15, 30, or 60 seconds – and measure for at least one hour. Depending on how long the line is, how many satellites are in sight, and their relative geometry, you may need to measure for a longer time. Remember: measure twice to avoid mistakes. Once you collect enough data, turn off the rover, move it to the next baseline, and repeat the process. For even greater speed, add another rover and alternate the two rovers’ placement to measure each line.
Rapid Static Measuring: If you’re working on a site that’s never had any GPS surveys done, you’ll first need to establish several points with known coordinates in order to calculate transformations. Choose a point for the reference receiver, and then move one or more rovers to each of the other known points. As in static measurement, the time that each rover must measure depends on the baseline length and the GDOP. After you send the data to your office for processing, check for errors by measuring the same points again at a different time of day.
Kinematic Measuring: Set up the reference receiver, then place the rover at the end of the baseline. Making sure not to move the instruments from their stationary positions, turn on both receivers and wait 5 to 20 minutes (depending on the number of visible satellites and the baseline length). After the data is acquired, you can walk with the rover. It’s possible to record positions at a predefined rate, at predetermined positions, or both. However, try to avoid objects that might block the receiver signal. Should the rover lose sight of receivers so that there are fewer than four, move it to where it can see four or more satellites, then re-initialize it before you continue measuring.
Real-Time Kinematic (RTK) Measuring: RTK is replacing kinematic measuring. The rover gets signals from the reference, but because it also has its own GPS antenna, it receives satellite signals directly instead of through the reference receiver. The rover then processes both signals to resolve the ambiguity. Start by setting up the reference receiver. Once it is picking up the satellite signal, you can turn on the rover. Wait until the rover starts tracking both the satellites and the reference. When this happens, the rover will initialize, resolve ambiguities, and be ready to record both points and coordinates. Baseline measurements are accurate between 1 cm and 3 cm. Be sure not to lose contact with the reference, which causes the rover to lose the ambiguity calculations and thus accuracy. Check your transmitting radio for interference. Make sure the antennas on both the transmitting and receiving radios aren’t blocked by tall buildings, and that your cable to the antenna isn’t so long that the signal degrades.

GIS / Mobilmapping

GIS is an integrated collection of software and data that visually organizes information around the concepts of geographic location and space. GIS can be used for geographic analysis, map making, database management, and geospatial statistics. GIS can be applied to many applications in several fields of study. You can use GIS to:
 
-Study the distribution of populations
-Study physical features of the earth and natural phenomena
-Find the optimal location for starting a business or locating an event
-Identify markets to target
-Identify geographic patterns like clustering
-Determine the best routes or paths to follow
-Tie together separate pieces of data to create new information
-Create maps
Basic GIS Principles:
-Geographic features are stored in individual GIS files. These files are the raw materials for geographic analysis and map making
-GIS files are georeferenced, which means features are drawn to scale and
  tied to actual places on the earth via coordinate systems and map projections
-Since coordinate systems and map projections are standardized, GIS data from many sources can be shared
-GIS files come in several different formats; they can represent continuous surfaces (raster) or discrete geometry (vector)
-GIS software is the tool / window for viewing, analysing, and manipulating GIS data
-Data tables that are place-based can be converted into GIS data by either plotting the
 table data using latitude and longitude or by joining table data to GIS features using a common ID code
 
Guiding user application is broadly based only 
2-5m Accuracy 
General GIS/mapping in the asset management of utilities, agriculture, environmental groups etc.
Sub Metre Accuracy
Advanced GIS/mapping in the above ground asset management of utilities, councils. Harvest monitoring, spraying, buried asset location etc in agriculture. Site monitoring of test bores, weeds, plants, animals etc in environmental groups.
Sub 30cm Accuracy
Entry level machine guidance, buried asset management of utilities, councils.
Sub 10cm Accuray
High accuracy GIS and position pick up and stakeout. e.g. High value asset location that requires excavation, Auto steer systems in agriculture, irrigation suppliers quoting, as built pick up and design stake out.
Cm Accuracy
Survey grade work. Building and construction as built data collection, general site stake out. General road repairs. Mine site blast holes set out, volumes, etc.
To download the GPS GNSS Summery Brochure please click here
Click here for information on GPS/GIS CHC LT30 Handheld Controller
Surveying & Mapping Solution
Click here for information on Spectra Precision SP60 GNSS Receiver
Click here for information on Spectra Precision SP80 GNSS Receiver
Click here for information on Sprectra Precision Survey Pro Software, Including Precision Central
Click here for information on Hemisphere Atlas GNSS Global Correction Services
 
For price and availability please send us an email  sales@gsrlasertools.com.au  sales@gsrlasertools.com.au
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  • CHC LT500 GNSS Handheld Reciver CHCLT500H

    CHC LT500 Series GNSS Handheld Receiver. Professional Surveying & Mapping Solution. The CHC LT500 series offers 3 different options to meet requirements of various applications with adoption of Windows Embedded Handheld 6.5 operation system. Featuring outstanding specifications and cutting edge technologies integrating with gyro, laser alignment e-compass etc.
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    The GPS Speed Alert provides drivers with an accurate, highly visible, fast response digital speedometer and over-speed alert in a small, easy to mount unit.

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    Full Featured GPS Trip Meter with Integrated GPS. The GPS Trip Meter provides highly visible and configurable distance readout, independent of the vehicle.No installation is required. Two independent distance readouts as well as speed and other statistics are available. A alternative for the common Trip meter where there is a need to connect to the Speedo output signal. For current price & availability please call.

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    The GPS Trip Meter Remote control replaces the standard external reset switch and adds extra functionality for users who regularly need to pre-set trips, change direction or otherwise interact with the trip-meter. Compatible with all GPS Trip Meters GT1000.

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  • Hire-GPS Kits HICHCGNSSKIT

    Hire - Survey grade GPS Network RTK GNSS Rover - UHF base and Rover RTK kit - GIS handheld network Rover. 

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    With all the great features of a Full HD dash cam (G-sensor, GPS logging, Motion detection etc.) with the added rear facing camera for the best all-round video evidence,  plus the ADAS, this is a must have driver safety/protection device than anyone can afford. Highly appreciated in mining, transport and fleet logistics application. For price & availability please call or email to sales@gsrlasertools.com.au

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