MIT License

Copyright (c) 2025-2026 Southern California Extreme Heat Research Hub and
San Diego Regional Climate Collaborative

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

================================================================================
SCOPE OF THE MIT GRANT — READ THIS BEFORE REDISTRIBUTING
================================================================================

"The Software" above means the CODE in this repository:

  * the build pipeline under `scripts/`
  * the front-end source — the HTML/CSS/JavaScript authored here, including the
    `HTML_TEMPLATE` string in `scripts/build_diy_pca_viewer.py`
  * the test suite

"The Software" does NOT mean the DATA. Three things are carved out of the MIT
grant, because this project has no right to license them the way MIT does.

1. THE TRACT DATA PAYLOAD EMBEDDED IN THE GENERATED VIEWER.

   `main/heat_risk_map.html` is a build artifact: front-end code with a complete
   tract-level dataset baked into it. The code in that file is MIT. The embedded
   data is NOT — it is governed by DATA_LICENSE.md, and it includes third-party
   material this project cannot sublicense (see 2 and 3). Copying the generated
   HTML is not covered by this MIT grant.

2. HEALTHY PLACES INDEX (HPI) DATA — NON-COMMERCIAL.

   HPI's terms forbid commercial use. HPI-derived percentile columns are
   embedded in the generated viewer so the map can display them, under HPI's own
   terms with attribution. They are excluded from the "Download Data" export for
   exactly this reason. MIT permits selling copies; HPI does not permit
   commercial use. MIT therefore cannot and does not extend to HPI data.
   Obtain HPI data from HPI: https://www.healthyplacesindex.org/

3. UCLA HEAT MAPS / CalHeatScore DERIVED VALUES.

   Aggregated from California HCAI emergency-department records and used as a
   display-only layer. Excluded from the export. Not sublicensed here.

If you want the CODE, take `scripts/` and the front-end source under MIT — that
is a real, unrestricted grant and it is the part we are inviting you to reuse.
If you want the DATA, read DATA_LICENSE.md: this project's own contributions
(composite scores, percentile ranks, and the layers computed here) are CC BY 4.0,
and each third-party input keeps its original terms.

If you use this work, please cite it — see CITATION.cff.