Can RTK Signal Be Used for Accurate Field Boundary Mapping and Creating Digital Terrain Models?

Yes, absolutely. RTK signal provides accuracy up to 2-3 cm, making it perfect for mapping field boundaries and creating terrain models. Regular GPS can be off by several metres, whilst here the error is just a couple of centimetres. That's precisely why RTK is widely used in precision farming, surveying, and land delimitation.

How RTK Works and Why It's So Accurate

RTK stands for Real-Time Kinematic. The system picks up signals from satellites, but the key element is the base station. It sits at a point with known coordinates and transmits corrections to your receiver. This fixes all the errors from the atmosphere, ionosphere, and other interference.

Regular GPS only processes the signal code, whilst RTK analyses the actual phase of the wave. The difference is like between a ruler and a micrometre. Instead of 3-5 metres of error, we get 2-3 cm. Mind you, this requires constant communication between the base and receiver, either through radio or internet.

Why Such Accuracy Matters for Field Mapping

Real Boundaries Without Disputes

When you define field boundaries with centimetre accuracy, there won't be any conflicts with neighbours. Regular GPS can "take away" or "add" several metres, and that's real hectares on large areas. RTK shows the actual area and records every turn of the boundaries.

Everything Immediately, No Processing

You drive along the field edge with the receiver, and coordinates are recorded in real time. Data is ready straight away, no need for additional processing. If something went wrong on a certain section, you can return and go over it again. Everything's visible on the tablet screen right now.

Quick and Without Extra People

One person with an RTK receiver can measure dozens of hectares in a working day. Classical surveying requires at least two specialists, theodolites, staffs. Here everything's much simpler and faster. The data can then be immediately uploaded to any agro-navigation programme or GIS.

How Digital Terrain Models Are Created

Collecting Points Across the Field

A terrain model is a set of points with coordinates and elevations. The RTK receiver records X, Y, and Z for each point. The more points collected, the more detailed the terrain picture will be.

For a 100-hectare field, 300-500 points with a step of about 20-30 metres usually suffice. If the terrain is complex, with slopes and hollows, more points are taken. The receiver can record them automatically, for instance, every 5 seconds or every 10 metres of travel.

What the Terrain Model Provides in Practice

Having an accurate model, you can plan drainage, see where water flows, where it stagnates. You can see which areas are prone to erosion, where moisture accumulates. It's useful for irrigation too - you understand where more water is needed and where less.

Very convenient to use for differentiated fertiliser application. One regime in lowlands, another on elevations. Soil moisture at different heights varies, as does fertility. Knowing the terrain, you can precisely adjust agrochemical doses for each zone of the field.

What's Needed to Work with RTK

Equipment

The basic kit is simple: RTK receiver with antenna, base station (or access to a network of stations), tablet or controller for operation. In Ukraine there are ready-made kits from Nav Agro, Smilab Agro, and other manufacturers.

You can set up your own base or connect to a network of RTK stations via mobile internet. Your own base doesn't depend on the internet but costs more. A network base is more convenient, but requires stable 4G.

Software for Work

For data collection, programmes like SmiLab-Agro, Field Rover, Mobile Topographer are used. They record tracks, build boundary polygons, export files in various formats.

For processing and creating terrain models, QGIS, Global Mapper, Surfer are suitable. These programmes build 3D models, calculate heights between points, create slope maps.

What Affects Accuracy

Factor	How It Affects	What to Do
Distance to base	Up to 10 km accuracy 2 cm, beyond 30 km worse	Place base closer to centre of working zone
Obstructions	Trees, buildings block satellites	Work in open areas
Number of satellites	Fewer than 5 - accuracy drops	Enable all systems GPS, GLONASS, Galileo
Connection with base	No connection - no RTK	Reliable radio or stable 4G

How Much It Costs and When It Pays Off

Basic RTK receivers start from 12 thousand hryvnias (Nav Agro mini). Professional models like Nav Agro RTK-2 cost around 36 thousand. Software is either free or up to 6 thousand for versions with additional features.

It pays off quickly. Firstly, no need to pay surveyors. Secondly, accurate area accounting. Thirdly, savings on fertilisers through differentiated application. On a 1000-hectare farm, you can save up to 10% of agrochemical costs simply thanks to an accurate terrain model.

How to Work Properly

Before starting, check receiver calibration and connection with the base. Make sure the system shows RTK fix with 2-3 cm accuracy.

When driving around boundaries, hold the antenna strictly vertical at a height of 1.5-2 metres. Move evenly, not too fast, about 5-10 km per hour. Make control points at noticeable locations to check accuracy later.

For the terrain model, collect points evenly across the entire field. On slopes and in lowlands, make points more frequently, about every 10-15 metres. Definitely record points near water bodies, in places where water stagnates after rain.

Summary

RTK provides professional accuracy for boundary mapping and building terrain models. An error of 2-3 cm allows creating detailed maps for precision farming.

For farms, this is real savings and competitive advantage. Accurate land accounting, optimisation of agrochemical costs, ability to use modern technologies. Ukrainian-manufactured equipment is accessible and suitable for farms of any size.