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UID:pretalx-foss4g-europe-2026-YWDSJ9@talks.osgeo.org
DTSTART;TZID=EET:20260701T113000
DTEND;TZID=EET:20260701T120000
DESCRIPTION:Five years ago\, **Awesome Spectral Indices** (ASI) was launche
 d to address a persistent gap in Earth observation workflows: while hundre
 ds of spectral indices existed in the literature\, their definitions were 
 fragmented\, inconsistently documented\, and rarely designed for direct pr
 ogrammatic use. What began as a curated effort to standardize and consolid
 ate these definitions has since evolved into shared open geospatial infras
 tructure.\n\nThe first public release in 2021 included 66 indices structur
 ed under a common schema with explicit naming\, formulas\, application dom
 ains\, and bibliographic references. A key design decision was the introdu
 ction of a cross-sensor band naming standard aligned with widely used sate
 llite platforms such as Landsat\, Sentinel\, and MODIS. By enabling expres
 sions like “`(N - R) / (N + R)`” to be both human-readable and machine
 -executable\, ASI moved from being a static catalogue to a lightweight and
  interoperable specification.\n\nOver the past five years\, the project ha
 s grown to more than 260 indices (v0.9.0) and expanded beyond a single rep
 ository into a multi-language ecosystem. Open-source APIs operationalize t
 he specification in Python (*spyndex*)\, the Google Earth Engine Code Edit
 or (*spectral*)\, and Julia (*SpectralIndices.jl*)\, alongside community-d
 riven implementations such as the R package *rsi*. With over 1k GitHub sta
 rs\, more than 200k downloads across PyPI and conda-forge\, and alignment 
 with the electro-optical STAC extension\, ASI now functions as reusable in
 frastructure embedded in reproducible Earth observation workflows.\n\nThis
  talk reflects on five years of technical and community development: the e
 volution from list to specification\, a design that supports scientific co
 mpleteness and implementation simplicity\, and the role of metadata and ve
 rsioning in ensuring long-term sustainability. It concludes with the next 
 phase of development\, including extensions to the band standard\, richer 
 metadata\, expanded categorization\, and API refinements aimed at strength
 ening interoperability and ensuring that spectral indices remain stable an
 d accessible within the open geospatial ecosystem.
DTSTAMP:20260605T011016Z
LOCATION:A13
SUMMARY:From NDVI to an Open Ecosystem: Five Years of Awesome Spectral Indi
 ces - David Montero Loaiza
URL:https://talks.osgeo.org/foss4g-europe-2026/talk/YWDSJ9/
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