Synthetic ladder — 4.0 mm/px — dense
synth-ladder-4-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 ~2.5 px across, an individual plant is 2–3 pixels. Percent cover or density per m² is the only measure that survives review — individual counts at this GSD are not defensible.
- 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 237 · seed 41754814
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
237 plants and 37 planted hard negatives, exact by construction.
| Species | Plants | Px at 4.00 mm/px | Verdict |
|---|---|---|---|
Ceratocephala pungens Pygmy buttercup · 18 mm across | 68 | 4.5 px | Marginal |
Myosotis brevis Dwarf forget-me-not · 12 mm across | 52 | 3.0 px | Marginal |
Myosurus minimus subsp. novae-zelandiae NZ mousetail · 30 mm across | 68 | 7.5 px | Countable |
Species D — to confirm Assumed Myosotis hikuwai · 14 mm across to confirm with Habitat NZ | 49 | 3.5 px | Marginal |
Hard negatives Schist chips, lichen, droppings, shadow — must not be counted | 37 | — | 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.