Schemas

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Raster band metadata schema

Describes the properties of each raster band after resampling or convolution.

Field	Type	Units	Description
band	int	–	Sequential band number
wavelength_nm	float	nm	Center wavelength
fwhm_nm	float	nm	Full width at half maximum
unit	string	–	Measurement units for reflectance

Example JSON:

[
  {"band": 1, "wavelength_nm": 450.0, "fwhm_nm": 20.0, "unit": "nm"},
  {"band": 2, "wavelength_nm": 550.0, "fwhm_nm": 25.0, "unit": "nm"}
]

Pixel table schema

Each row represents one pixel extracted from a raster scene.

Column	Type	Units	Description
Pixel_ID	int	–	Unique pixel identifier
Pixel_Row	int	row	Raster row index (0‑based)
Pixel_Col	int	col	Raster column index (0‑based)
B1..Bn	float	reflectance	Band reflectance values

Example table:

Pixel_ID	Pixel_Row	Pixel_Col	B1	B2	B3
1	10	15	0.12	0.09	0.03
2	11	16	0.10	0.08	0.02

Spectral library schema

Spectral libraries store reference spectra for endmembers used during unmixing. When saved as JSON or Parquet, each record contains:

Field	Type	Description
spectrum_id	string	Unique identifier
class_label	string	Endmember class (e.g., soil, vegetation)
wavelength_nm	array	Wavelength centers
reflectance	array	Corresponding reflectance values
metadata	object	Optional information (sensor, date, notes, etc.)

Example JSON entry:

{
  "spectrum_id": "veg01",
  "class_label": "vegetation",
  "wavelength_nm": [450, 550, 650],
  "reflectance": [0.12, 0.32, 0.45],
  "metadata": {"sensor": "NEON", "acquired": "2020-08-01"}
}

MESMA outputs schema

Results from Multiple Endmember Spectral Mixture Analysis for each pixel.

Column	Type	Units	Description
Pixel_ID	int	–	Input pixel identifier
fraction_*	float	fraction	Fractional abundance per endmember band
RMSE	float	reflectance	Root mean square error of the model fit
QA	int	–	Quality flag (0=good, higher=worse)

Example table:

Pixel_ID	fraction_soil	fraction_veg	RMSE	QA
1	0.40	0.60	0.01	0
2	0.55	0.45	0.02	1

Example JSON line for one pixel:

{
  "Pixel_ID": 1,
  "fraction_soil": 0.40,
  "fraction_veg": 0.60,
  "RMSE": 0.01,
  "QA": 0
}

Last updated: 2025-08-18