GPS Survey

The surveying and mapping community was one of the first to take advantage of GPS because it dramatically increased productivity and resulted in more accurate and reliable data. Today, GPS is a vital part of surveying and mapping activities around the world. When used by skilled professionals, GPS provides surveying and mapping data of the highest accuracy. GPS-based data collection is much faster than conventional surveying and mapping techniques, reducing the amount of equipment and labor required. A single surveyor can now accomplish in one day what once took an entire team weeks to do. Municipal workers in hard hats using GPS equipment to record the location of a fire hydrant GPS supports the accurate mapping and modeling of the physical world — from mountains and rivers to streets and buildings to utility lines and other resources. Features measured with GPS can be displayed on maps and in geographic information systems (GIS) that store, manipulate, and display geographically referenced data. Our GPS provides Graphics Module and direct link to GIS applications. Data can be process as Fast Static, Static, Rapid Static, Kinematic and Semi-kinematic. The module allows you to analyze and edit your final positions, lines and polygons before your export them, along with descriptive data, into standard GIS formats (Arc Info., Map Info, Shapefile, DXF, etc.). ASC11 generic formats are also supported. Benefits of using GPS Significant productivity gains in terms of time, equipment, and labor required Fewer operational limitations compared to conventional techniques. Accurate positioning of physical features that can be used in maps and models. Faster delivery of geographic information needed by decision makers. Centimeter-level surveying results in real-time. GPS Surveying Techniques : Static Kinematic Rapid Static (Fast Static) Continuous Kinematic Real Time Kinematic (RTK) Equipment :

Real-Time Performance Instant-RTK® Initialization - Typically 2 sec for baselines < 20 km - Up to 99.9% reliability RTK initialization range: over 40 km

Post-Processing Accuracy (RMS) Static & Fast Static ■■ Horizontal: 3 mm + 0.5 ppm ■■ Vertical: 5 mm + 0.5 ppm High-Precision Static (3) ■■ Horizontal: 3 mm + 0.1 ppm ■■ Vertical: 3.5 mm + 0.4 ppm

Real-Time Kinematic Position (RTK) - Horizontal: 8 mm + 1 ppm Vertical: 15 mm + 1 ppm Network RTK - Horizontal: 8 mm + 0.5 ppm -Vertical: 15 mm + 0.5 ppm

Real-Time Accuracy (RMS) SBAS (WASS/EGNOS/MSAS/GAGAN) - Horizontal : < 50 cm - Vertical : <85 cm

Real-Time Accuracy (RMS) SBAS (WAAS/EGNOS/MSAS) - Horizontal < 50 cm (1.64 ft) Real-Time DGPS position - Horizontal 25 cm (0.82 ft) + 1 ppm in typical conditions Real-Time Kinematic Position (fine mode) - Horizontal 10 mm (0.033 ft ) + 1.0 ppm - Vertical 20 mm (0.065 ft) + 1.0 ppm

Real-Time Performance Instant-RTK® Initialization - Independent of GPS availability when other GNSS signals are available - Typically 2-second initialization for baselines < 20 km - 99.9% reliability RTK Initialization range - > 40 km

Post-Processing Accuracy (RMS) Static, Rapid Static - Horizontal 5 mm (0.016 ft) + 0.5 ppm - Vertical 10 mm (0.033 ft) + 0.5 ppm Long Static4 - Horizontal 3 mm (0.009 ft) + 0.5 ppm - Vertical 6 mm (0.019 ft) + 0.5 ppm Post-Processed Kinematic - Horizontal 10 mm (0.033 ft) + 1.0 ppm - Vertical 20 mm (0.065 ft) + 1.0 ppm

1. Spectra Precision SP80

2. Astech Promark 800