Guidance Lines Simulator
Drop your boundary + AB lines or pick a sample — we score AB Straight · AB Curve · Boundary · Topography · Auto-blocks on coverage, fuel, and annual ROI, then play back the winner.
This page plans paths on one field at a time. The full GeoPard platform combines multi-year yield, NDVI, soil tests, and real elevation into management zones, then generates variable-rate prescriptions and pushes them to your machine.
Seven layers stack on the canvas. Here is what each colour and symbol means agronomically.
Elevation low → high
Synthetic terrain heatmap, purple (low) to red (high). Drives the slope cost and which lines Topography follow chooses.
Field boundary
Outer edge of the workable area. Sample fields or your uploaded GeoJSON / KML / shapefile polygon.
Guidance pass
Centerline of each implement pass. Spacing equals equipment width. The tractor steers down these lines.
Headland strip
Turnaround zone around the perimeter, usually 2–3 swath widths. Worked first by Boundary Follow, last by the others.
U-turn / direction →
Turnaround arcs and the arrow showing drive direction along each pass. Fewer U-turns = less idle time and less fuel.
Soil compaction zone
Where repeat turnarounds concentrate wheel passes. Compacted strips lose 5–15 % yield over time and are worth rotating.
Swath covered
Area actually worked by the implement (pass × equipment width). Drives the coverage % in the metrics panel.
AB Straight — parallel passes along the field's principal axis. The default for rectangular fields. Simplest to drive.
AB Curve — gentle wave on each parallel pass. Useful when the field shape has irregular edges; the curve clips into corners better than a straight line.
Boundary Follow — perimeter ring(s) inside the headland strip plus parallel body passes. Matches the real-world practice of working the headland first then filling the body.
Topography follow (terrain) — passes that trace constant-elevation lines. The only approach that uses elevation data. Best on sloped fields where driving across contours burns 20–40 % more fuel than driving along them.
For each body pass, the tool samples elevation along the centerline every 4 m and measures the local grade (rise / run) along the drive direction. Mean squared grade × 12 = fuel-penalty multiplier. A 5 % sustained grade costs ~3 % extra fuel; a 15 % grade costs ~27 % extra — typical real-tractor figures.
Turnarounds get a fixed 1.25× penalty per metre (engine load + hydraulics + gear changes). Both numbers show up as "slope cost" and "turn fuel" in the right-panel breakdown.
The tool rasterises the field into wM / 3 cells, marks cells inside the boundary, then checks each one against the nearest pass / ring center-line at wM / 2 distance. Honest union area — no overlap double-counting.
Common reasons for < 100 %: sharp boundary corners that the headland ring's inset can't reach; concave shapes (L-shape) where straight passes miss the second arm; curved boundaries (oval, pivot) where rounded corners under-fill. The fix is usually a different axis (try the slider), Boundary Follow, or splitting the field into sub-fields with different headings.
GeoJSON (.geojson, .json) — Feature, FeatureCollection, or bare Polygon / MultiPolygon. Multi-feature files iterate via ‹ / › arrows under the upload button.
KML (.kml) — Placemark polygons. Multi-placemark files are also iterable.
Shapefile zip (.zip) — standard ESRI shapefile, expects EPSG:4326 (WGS84). Projected shapefiles silently mis-place coordinates; reproject first or use the full GeoPard app which handles reprojection.
No. The tool runs fully in your browser. Your field boundary is never uploaded anywhere — close the tab and it's gone. For long-term storage, multi-year analytics, prescriptions, and machine integrations, register a free GeoPard account.
This tool is a planner — it doesn't write equipment files directly. The full GeoPard app exports variable-rate prescription files and imports as-applied data via John Deere Operations Center, CNH FieldOps, and AGCO / PTx FarmEngage. Shapefile and ISO-XML exports cover other monitors. Mixed-fleet farms welcome.
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