Field Art Builder — Image → Lines → KML

Field Art Builder — Image → Lines → KML

Turn any image (logo, sketch, mascot) into simplified line paths, georeference it to a field, and export a KML you can load in Google Earth to mow precise artwork. Everything runs offline in your browser — perfect on iPhone/iPad with Save to Files.

What it does

• Converts an uploaded image to a clean line drawing (Sobel edges → contour trace → path simplification)
• Lets you set anchor latitude/longitude, feet per pixel, rotation, and flip
• Exports a KML with polyline paths (no servers, no tracking)
• On iOS, the Share / Save to Files sheet opens so you pick where the KML goes

How to use

1. Tap Upload image (JPG/PNG).
2. Adjust Edge threshold, Min path length, Simplify tolerance.
3. Enter your Anchor lat/lon (lower-left of the art after rotation/flips).
4. Set Feet per pixel to scale the art to your field size.
5. Optional: Flip X/Y or Rotate to match reality.
6. Generate & Download KML → choose Save to Files → open in Google Earth.

Notes & tips

• If edges look noisy, raise Threshold and/or Min path length.
• If lines are too sparse, lower Threshold or Downscale factor (try 1–2).
• Path simplification reduces points for smoother mower lines (increase tolerance for fewer points).
• Small-area geo math uses a feet→degrees approximation; it’s accurate at field scale.

Privacy

100% client-side. Your images never leave your device.

Compatibility

• Mobile Safari / iOS: supports the native Share / Save to Files flow.
• Chrome/Edge/Firefox desktop: standard download dialog.

Known limits

• Very large images may take a few seconds to process on phones.
• If your browser doesn’t support the Web Share API with files, it will fall back to a normal download.

Changelog

• v1.1 — iOS share sheet enabled; download stops at Save/Share window.
• v1.0 — Initial release (image→lines, georef, KML export).

License

Free to use for personal and commercial field art. No warranty.