GPS and Mapping Project Ideas for 4-H and FFA

Where things are, and why it matters

Geospatial projects use GPS receivers, maps and geographic information systems, or GIS, to record and analyze location. In agriculture the same tools guide planting, record yields by area, map soil and plan conservation work. Members can start with a phone or a handheld GPS and a patch of ground they know well.

Ideas by level

Younger members: hand-draw a map of your yard or fairground with a scale and compass rose, then compare it to an aerial image.
Beginner: go geocaching with an adult and record how accurately your GPS places you at known points.
Intermediate: map trees, garden beds or pasture gates with waypoints and build a labeled map in free GIS software.
Intermediate: walk a field boundary with a GPS and calculate its area, then compare with county records.
Advanced: create a layered map for a farm or club project showing soil types, water, fence lines and planned improvements.

Skills learned

Coordinates, map scale, coordinate systems, data accuracy, layers and cartography all come up. You will notice that consumer GPS has error, which varies with sky view and device. Reporting accuracy honestly is the key scientific habit here.

A field mapping walk-through

Decide what you want on the map before you start: boundaries, trees, water, buildings. Save points with clear names and note the time. Walk the boundary slowly at a steady pace, pausing at corners. Back at a computer, import the data, check for strange outliers and overlay it on an aerial image. Add a title, scale, north arrow and source note. The USDA offers public soil and conservation information you might add as a layer.

Understanding GPS accuracy

A phone may place you within a few yards on a clear day and much farther off beside buildings or under heavy tree cover. To test this, mark a known point such as a survey marker or a fixed corner, then take readings at different times and record how far each one lands from the true location. Plot the scatter on a graph. This accuracy study makes an excellent stand-alone project and teaches why precision agriculture relies on correction signals and specialized receivers.

Safety and permission

Always get landowner permission before mapping private land, tell an adult where you are going, and avoid hazards while looking at a screen. Respect gates and livestock. Do not publish exact locations of private property or vulnerable wildlife without permission. If a drone is part of your program, follow current rules and have trained supervision.

Cost, records and next steps

A phone and free software are enough to begin. Keep data files, screenshots and a written method. Exhibits can include printed maps and posters. Careers include precision agriculture specialist, surveyor, conservation planner and GIS analyst. Related pages: computers, exploring your environment and special agronomy. NASA has Earth observation resources at NASA STEM. Visit farm.fm's farming section and agriculture.directory, and add it to your 4-H and FFA project ideas.