Question 1

What's the difference between RTK, PPK, and static GNSS surveying?

Accepted Answer

RTK gives you centimeter-level positioning instantly in the field via live correction data. PPK records raw data during the survey and corrects it afterward on a computer when a live connection isn't reliable. Static surveying leaves a receiver stationary for extended periods for high precision control points. Most modern GNSS receivers support all three modes.

Question 2

How long does a GNSS receiver battery last in the field?

Accepted Answer

Most professional GNSS receivers, such as the SinoGNSS T30 or Mars series, provide 8 to 12 hours of continuous RTK rover operation on a single charge. Base station mode typically lasts longer since it draws less power.

Question 3

Why is my GNSS receiver not getting a FIX status?

Accepted Answer

A GNSS receiver failing to reach FIX status is usually caused by poor satellite visibility, a weak or lost correction signal (NTRIP/radio link), incorrect mount point or coordinate system settings, or outdated firmware.

Question 4

What's the difference between a reflectorless and prism-based total station?

Accepted Answer

A reflectorless total station measures distances directly off a surface without a prism, speeding up work in hard-to-reach areas. Prism-based measurement requires a reflective target prism and offers longer range and higher accuracy at distance.

Question 5

How do I choose between a single rover and a base-and-rover GNSS setup?

Accepted Answer

A single rover connects to an existing network like CORS via NTRIP, ideal for areas with reliable network coverage. A base-and-rover setup uses your own base station to broadcast corrections, suited for remote areas without internet or network coverage.

Question 6

How many CORS stations does OTIC Geosystems operate, and what coverage is provided?

Accepted Answer

OTIC Geosystems operates a growing network of 24 CORS stations, delivering real-time RTK correction coverage with centimeter-level positioning accuracy across major regions.

Question 7

What payload options are available for mapping and agricultural drones?

Accepted Answer

Mapping drones support RGB cameras, multispectral sensors, LiDAR, and thermal cameras. Agricultural spraying drones carry tank-and-nozzle payloads sized by liter capacity for crop spraying applications.

Question 8

How accurate is drone-based mapping compared to ground surveying?

Accepted Answer

With RTK/PPK-enabled drones and properly placed ground control points (GCPs), drone mapping can achieve horizontal and vertical accuracy between 1 to 3 centimeters, comparable to ground-based methods for large area mapping.

Question 9

What does IMU tilt compensation mean on a GNSS receiver?

Accepted Answer

IMU tilt compensation allows a GNSS receiver to maintain accurate positioning even when the survey pole isn't held perfectly vertical, using internal sensors to calculate and correct for the pole angle up to 30 to 60 degrees.

Question 10

How often should survey equipment be calibrated?

Accepted Answer

Total stations and optical levels should be calibrated at least once a year, or more frequently if subjected to rough handling or daily use. GNSS receivers require periodic firmware updates and antenna checks.

Question 11

What's the difference between single, dual, and triple-frequency GNSS receivers?

Accepted Answer

Single-frequency (L1) receivers provide basic meter-level GIS accuracy. Dual-frequency (L1/L2) receivers provide standard centimeter RTK accuracy. Triple-frequency receivers add a third signal band for faster initialization and higher reliability in urban or canopy areas.

Question 12

What payment methods do you accept for international orders?

Accepted Answer

OTIC Geosystems accepts international bank transfers (wire transfer) and other agreed payment methods in USD. Contact oticgs@gmail.com for details.

Question 13

How long does international delivery take?

Accepted Answer

International delivery timelines depend on destination country, shipping method, and customs processing. Contact oticgs@gmail.com to request expedited shipping options.

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