# Mosquito Imagery Sources

Mixed-license imagery in this directory: 4 species + 1 lifecycle image come from CDC PHIL (public domain). 3 species come from Wikimedia Commons (CC-BY-SA 4.0, CC-BY 2.0, and CC0). 1 lifestyle photo comes from Unsplash. Attribution is documented even where the license does not require it.

## Files

| File | Source | Subject | Author / Photographer | License | URL |
|---|---|---|---|---|---|
| `aedes-aegypti.webp` | CDC PHIL #26041 | Resting female *Aedes aegypti* | CDC | Public domain (17 USC §105) | <https://phil.cdc.gov/Details.aspx?pid=26041> |
| `aedes-aegypti-larva.webp` | CDC PHIL #26030 | *Aedes aegypti* larva at the surface of standing water | CDC | Public domain | <https://phil.cdc.gov/Details.aspx?pid=26030> |
| `aedes-albopictus.webp` | CDC PHIL #4487 | Female *Aedes albopictus* (Asian tiger mosquito) feeding | CDC / James D. Gathany | Public domain | <https://phil.cdc.gov/Details.aspx?pid=4487> |
| `culex-quinquefasciatus.webp` | CDC PHIL #17697 | Female *Culex quinquefasciatus* (Southern house mosquito) feeding | CDC | Public domain | <https://phil.cdc.gov/Details.aspx?pid=17697> |
| `culex-pipiens.webp` | Wikimedia Commons | *Culex pipiens* specimen, indoors, Riga, Latvia, 2019-04-19 | AfroBrazilian | CC-BY-SA 4.0 | <https://commons.wikimedia.org/wiki/File:Culex_pipiens_03.JPG> |
| `aedes-vexans.webp` | Wikimedia Commons | Male *Aedes vexans* (inland floodwater mosquito), Georgia, 2020-06-16 | Christina Butler | CC-BY 2.0 | <https://commons.wikimedia.org/wiki/File:Inland_Floodwater_Mosquito_-_Aedes_vexans_%E2%99%82_(50046173648).jpg> |
| `anopheles-quadrimaculatus.webp` | Wikimedia Commons | *Anopheles quadrimaculatus* mosquito on white background, 2003-02-12 | Edward McCellan / USCDCP | CC0 / Public Domain | <https://commons.wikimedia.org/wiki/File:A._quadrimaculatus.jpg> |
| `dog-outdoor.webp` | Unsplash | Dog running through a field of yellow flowers | Rafaëlla Waasdorp | Unsplash License (free for commercial use, attribution appreciated but not required) | <https://unsplash.com/photos/a-dog-running-through-a-field-of-yellow-flowers-SEGsw2Kmd08> |

## License notes

- **CDC PHIL images**: works of US federal employees, in the public domain under 17 USC §105. No attribution required.
- **Wikimedia CC-BY-SA 4.0** (`culex-pipiens.webp`): requires attribution to the author and a link to the license. Derivative works (including resized/recompressed versions) must carry the same CC-BY-SA 4.0 license. The on-site attribution lives in this file. License: <https://creativecommons.org/licenses/by-sa/4.0/>.
- **Wikimedia CC-BY 2.0** (`aedes-vexans.webp`): requires attribution. License: <https://creativecommons.org/licenses/by/2.0/>.
- **Wikimedia CC0** (`anopheles-quadrimaculatus.webp`): public-domain dedication; no attribution required, but the original CDC employee credit (Edward McCellan / USCDCP) is preserved here.
- **Unsplash License**: free for personal and commercial use. No attribution required, but the photographer credit is preserved here. License: <https://unsplash.com/license>.

## On-site attribution

Per CC-BY-SA 4.0 §3(a)(1) and CC-BY 2.0 §4(b), the on-site visible page (e.g. `/mosquito` or any state forecast page) must carry attribution to the licensed images either inline near the image or via a link to this file. The current implementation surfaces attribution via the "Image Credits" link in the site Footer (Phase 2 Task 2.8). The link points to `/images/mosquitoes/SOURCES.txt` (not `.md`) because Amplify's default SPA rewrite catches `.md` extensions and returns the SPA shell instead of the file content.

## Provenance

Originals downloaded on 2026-04-29 (CDC PHIL) and 2026-05-01 (Wikimedia + Unsplash). Originals are kept locally in `source/` (gitignored) and not committed to version control. Only the WebP outputs ship.

## Optimization

WebP conversion via [`client/scripts/convert-images-to-webp.js`](../../../scripts/convert-images-to-webp.js):

- Quality: 85
- Max width: 800px (downscale-only; smaller images are kept at native size)

## Re-running the conversion

```bash
cd client
node scripts/convert-images-to-webp.js \
  public/images/mosquitoes/source \
  public/images/mosquitoes \
  --map=26041_lores.jpg:aedes-aegypti.webp,26030_lores.jpg:aedes-aegypti-larva.webp,4487_lores.jpg:aedes-albopictus.webp,17697_lores.jpg:culex-quinquefasciatus.webp,wikimedia_culex_pipiens_03.jpg:culex-pipiens.webp,wikimedia_aedes_vexans.jpg:aedes-vexans.webp,wikimedia_anopheles_quadrimaculatus.jpg:anopheles-quadrimaculatus.webp,unsplash_dog_outdoor.jpg:dog-outdoor.webp
```

## Replacing with higher-quality imagery later

If commercial or commissioned imagery replaces these files, keep the same WebP filenames so component code does not need to change. Update this `SOURCES.txt` to reflect the new licensing posture.