Synthetic ladder — 0.5 mm/px — dense
synth-ladder-0p5-dense · Synthetic — generated with exact truth · 1280 × 960 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 ~20 px across, individual plants carry enough shape and colour for instance detection. Counting individuals is defensible at this scale.
- Dimensions
- 1280 × 960 px (1.2 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
- dense regime · target count 181 · seed 1979872719
The generator was asked for this many plants at this density regime; the recorded truth below is what it actually placed after collision rejection.
Ground truth by species
181 plants and 23 planted hard negatives, exact by construction.
| Species | Plants | Px at 0.50 mm/px | Verdict |
|---|---|---|---|
Ceratocephala pungens Pygmy buttercup · 18 mm across | 39 | 36.0 px | Countable |
Myosotis brevis Dwarf forget-me-not · 12 mm across | 46 | 24.0 px | Countable |
Myosurus minimus subsp. novae-zelandiae NZ mousetail · 30 mm across | 51 | 60.0 px | Countable |
Species D — to confirm Assumed Myosotis hikuwai · 14 mm across to confirm with Habitat NZ | 45 | 28.0 px | Countable |
Hard negatives Schist chips, lichen, droppings, shadow — must not be counted | 23 | — | 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.