Spherefix SP35Pro GNSS Receiver with AR Stakeout and Photogrammetry

Visual RTK surveying for demanding fieldwork

The Spherefix SP35Pro is a professional multi-band RTK GNSS receiver designed for surveyors, construction teams, civil engineers and GIS professionals who need accurate coordinates without slowing down field operations. In addition to conventional point surveying, the receiver combines inertial tilt measurement, photogrammetry and augmented-reality stakeout in one compact instrument.

This combination is especially useful when a survey point is difficult to reach safely or when a large number of design points must be set out across a busy site. Instead of relying only on a vertical survey pole and directional values on a controller screen, operators can use visual information to support measurement and stakeout work.

Photogrammetry for inaccessible points

The SP35Pro includes a dedicated 1/2.6-inch wide-angle photogrammetry camera. Together with the receiver’s positioning data, inertial sensors and compatible Android field controller, this allows the operator to capture visual data and determine points that may be inconvenient or unsafe to occupy directly with the pole.

In practical fieldwork, photogrammetry can help when collecting building edges, façades, corners, roadside features, trenches and other objects where placing the pole tip directly on the required point is difficult. It adds flexibility to normal RTK surveying without requiring a separate camera system for every visual measurement task.

AR real-scene stakeout

A separate ultra-wide-angle camera supports AR real-scene stakeout. The stakeout direction and target position can be shown over a live view of the surroundings, giving the operator a clearer visual route towards the point.

This is useful for construction layout, utility marking and general setting-out work, particularly when conventional arrows and distance values are difficult to interpret. By connecting digital stakeout information to the actual site view, the system can reduce unnecessary movement and make it easier to approach the correct position.

Measure with the pole tilted

The integrated IMU supports tilt compensation through an angle of up to 60°, with a stated positioning error of less than 2 cm within that range. The pole therefore does not have to remain perfectly vertical for every observation.

Tilt surveying is valuable beside walls, under vegetation, near parked machinery and around other obstructions where the survey pole cannot be held directly above the point. It also makes routine topographic collection more comfortable by reducing the time spent levelling the pole for each measurement.

Full-constellation multi-band GNSS tracking

The receiver uses 1408 tracking channels and supports signals from GPS, GLONASS, BeiDou, Galileo, QZSS, SBAS and NavIC. Tracking multiple constellations and frequencies gives the receiver access to a larger number of satellites, which can improve positioning availability where part of the sky is obstructed.

Specified RTK accuracy is ±(8 mm + 1 ppm) horizontally and ±(15 mm + 1 ppm) vertically under suitable operating conditions. The receiver supports RTCM 3.x correction data and an update rate of up to 20 Hz, making it suitable for detailed topographic surveys, construction positioning, site control and GIS asset collection.

Network RTK and local base workflows

The SP35Pro can be configured as a rover, base receiver or static GNSS receiver. Integrated 4G enables direct access to compatible NTRIP and CORS correction services where mobile coverage and an RTK network are available. Wi-Fi and Bluetooth provide connections to field controllers, smartphones and tablets.

For projects without dependable mobile data coverage, the built-in 410–470 MHz radio can transmit or receive corrections in a local base-and-rover setup. Selectable 0.5 W and 1.5 W output options and support for several common radio protocols provide flexibility when integrating the receiver into an existing equipment fleet.

• Rover operation with network or radio corrections
• Base operation for transmitting local correction data
• Static data collection for post-processing workflows

Built for mobile survey crews

At approximately 770 g, the SP35Pro is light enough for frequent movement between survey points. Its housing combines a magnesium-alloy shell with an ABS/PC top cover, providing a balance between low weight and field durability.

The receiver is IP68 rated and specified for operating temperatures from −30°C to +65°C. It is also designed to withstand a 2 m pole drop at room temperature. These characteristics make it suitable for everyday use on construction sites, roads, agricultural land and general outdoor survey projects.

The internal 7.4 V 6500 mAh battery provides more than 16 hours of typical rover operation using GSM. USB Power Delivery charging is supported, allowing crews to recharge the receiver with compatible field power equipment.

Suitable applications

The Spherefix SP35Pro is suited to cadastral and topographic surveying, construction stakeout, earthworks, road projects, utility mapping, GIS asset collection and general civil-engineering measurement. Its visual functions are particularly relevant to teams that regularly encounter inaccessible points or carry out intensive stakeout work.

Configuration and support from Global GPS Systems

Global GPS Systems can help buyers select a suitable SP35Pro configuration for network RTK, base-and-rover operation, photogrammetry or AR stakeout. The correct controller, software, radio frequency and accessories depend on the intended country, correction service and field workflow, so these details should be confirmed before deployment.

For organisations comparing GNSS receivers, the SP35Pro is a strong option when visual measurement and camera-guided stakeout are more important than laser distance measurement. Survey teams that specifically require an integrated laser should compare it with the separate Spherefix SP35 model.