Quadrat calibration — 1.0 mm/px — true zero (no plants)
synth-quadrat-1m-zero · Synthetic — generated with exact truth · 1280 × 1280 px
Viewer
Truth is exact by construction. Green crosses and boxes are real plants; dashed red are planted hard negatives — rock flecks, lichen and droppings a detector must not count.
Frame metadata
Everything downstream — every chart, every export, every number quoted to a panel — is indexed on these figures.
At ~10 px across, individual plants carry enough shape and colour for instance detection. Counting individuals is defensible at this scale.
- Dimensions
- 1280 × 1280 px (1.6 MP)
- Camera
- DJI Mavic 3E — wide
4/3 CMOS, 20 MP, 24 mm equivalent, ƒ=12.29 mm actual, 3.28 µm pitch. DJI's own rule of thumb is GSD ≈ H/36.5 cm/px; this spec gives ≈0.267 mm/px per metre AGL. The default survey camera and the one Keith is most likely to fly.
- Source
- Synthetic — generated with exact truth
- Licence
- CC0 (generated) commercial use OK
- Attribution
- Synthetic scene — EmerTech generator
- Scene
- scattered regime · target count 0 · seed 1714121510
A true-zero scene: the generator planted no plants at all, only hard negatives. Any count above zero here is a false positive, which is the cheapest honest test of a detector there is.
Ground truth by species
0 plants and 36 planted hard negatives, exact by construction.
| Species | Plants | Px at 1.00 mm/px | Verdict |
|---|---|---|---|
Ceratocephala pungens Pygmy buttercup · 18 mm across | 0 | 18.0 px | Countable |
Myosotis brevis Dwarf forget-me-not · 12 mm across | 0 | 12.0 px | Countable |
Myosurus minimus subsp. novae-zelandiae NZ mousetail · 30 mm across | 0 | 30.0 px | Countable |
Species D — to confirm Assumed Myosotis hikuwai · 14 mm across to confirm with Habitat NZ | 0 | 14.0 px | Countable |
Hard negatives Schist chips, lichen, droppings, shadow — must not be counted | 36 | — | never count |
Actions
Truth first, then models. A run without truth on the frame produces counts but no accuracy.
No human annotations on this frame yet.