Calibrated from GEE execution on 2026-03-29 (actual: 270.1 DOY). Will be validated against QGIS and folia outputs. Peak NDVI day-of-year derived from first-order harmonic fit to MODIS 16-day NDVI composites over central Kansas cropland. Peak timing varies by crop type and harmonic phase extraction method.
| Workflow | Model | Backend | Status | Answer | Error | Cost | Latency |
|---|---|---|---|---|---|---|---|
| exec | gold | gee | PASS | 270.0596389972697 | 0.0% | $0.000037 | 666ms |
| exec | gold | folia-rust | PASS | 270.0484619140625 | 0.0% | --- | 1ms |
| exec | gold | qgis | PASS | 270.048 | 0.0% | --- | 100ms |
The prompt given to LLMs in single-shot workflow benchmarks.
Problem: Fit harmonic curves to MODIS NDVI time series over central
Kansas cropland (2020-2023) to determine peak growing season timing.
Method:
- Load MODIS MOD13A2 16-day NDVI composites
- Fit first-order harmonic (1 cosine + 1 sine term)
- Extract phase angle and convert to day-of-year for peak NDVI
- Report mean peak DOY across the AOI
Study area: -98.5, 38.0, -98.0, 38.5 (central Kansas).
Expected answer: approximately DOY 270 (late September).