speclib

Federated spectral signature library with Kentucky-focused collections

Overview

speclib aggregates reflectance spectra from major public spectral libraries into a unified, searchable platform. It provides a Python package for researchers, a static web viewer for discovery, and an optional self-hosted API for power users.

The library federates spectra from USGS Spectral Library v7, ECOSTRESS, ASTER/JPL, and EMIT L2B, with a dedicated Kentucky chapter seeded with invasive species spectral data from Lyons et al. (2024).

Features

• Federated ingestion from USGS splib07, ECOSTRESS, ASTER/JPL, and EMIT L2B
• Dual storage — HDF5 archival backend + Parquet query layer
• Export to .esl (Esri), .sli (ENVI), SPECPR binary, ASCII, JSON
• Spectral resampling to Landsat, Sentinel-2, AVIRIS, EMIT, and custom sensors
• Static web viewer on GitHub Pages with D3.js interactive spectral plots
• Optional FastAPI server with REST API and Jinja templates
• Kentucky chapter with invasive species, mineral, and reclamation spectra

Getting Started

Prerequisites

• Python 3.11+
• pip

Installation

pip install speclib

With optional dependencies:

pip install speclib[server]    # FastAPI server
pip install speclib[emit]      # EMIT L2B support (netCDF4)
pip install speclib[all]       # Everything including dev tools

Quick Start

from speclib import SpectralLibrary

# Load the library from an HDF5 archive
lib = SpectralLibrary.from_hdf5("speclib_archive.h5")

# Search for quartz spectra
results = lib.search("quartz", category="MINERAL")

# Plot a spectrum
results[0].plot()

# Export to Esri Spectral Library format
results[0].export("quartz.esl", format="esl")

# Resample to Landsat 8 OLI bands
resampled = results[0].resample("L8_OLI")

CLI

speclib ingest usgs --config data/upstream/usgs_splib07.yaml
speclib search "honeysuckle" --category KY_INVASIVE
speclib export usgs_mineral_quartz_a1b2c3d4 --format sli --output quartz.sli
speclib build
speclib serve

Web Viewer

Browse the spectral library at: https://chrislyonsKY.github.io/speclib/

Data Sources

Citation

@software{lyons2026speclib,
  author = {Lyons, Chris},
  title = {speclib: Federated Spectral Signature Library},
  year = {2026},
  url = {https://github.com/chrislyonsKY/speclib},
  doi = {10.5281/zenodo.19390679},
  license = {GPL-3.0}
}

Contributing

See CONTRIBUTING.md.

Security

See SECURITY.md for reporting vulnerabilities.

License

GPL-3.0-only — see LICENSE for details.