Dataset Catalog
GNIS Gazetteer
Section titled “GNIS Gazetteer”Source: USGS Geographic Names Information System.
Base place-name database for Alaska and other regions. Used for search, labels, and geocoding.
Fields (examples): feature_id, feature_name, feature_class, latitude, longitude, state, county.
Update frequency: Yearly (or as USGS publishes).
ANCSA 17(b) Easements
Section titled “ANCSA 17(b) Easements”Why it matters: This is the hidden access layer in Alaska — public access routes and trails across Native corporation land under the Alaska Native Claims Settlement Act.
Contents: Public access routes, trail corridors, legal easements.
Documentation: Legal status, data sources, and mapping limitations are documented so users understand where access is recognized and where it is not. This dataset alone makes TrueTopo valuable for hunters, pilots, and explorers.
RS 2477 Trails
Section titled “RS 2477 Trails”Historic public rights-of-way. Often former mining or access routes with legal standing.
Fields (examples): trail_id, length, legal_status, geometry.
Use: Legal access routes, state claims, and historic trail mapping.
Hydrology
Section titled “Hydrology”Datasets: Rivers, lakes, watersheds.
Sources:
- USGS NHD (National Hydrography Dataset)
- Alaska DNR Hydrography
Used for water features, flow, and watershed context on the map.
Wildlife and fish
Section titled “Wildlife and fish”Datasets relevant to ecosystem and recreation:
- Salmon sonar counts — Run timing and escapement
- Fish run timing — Integration with Alaska fish count infrastructure
- Game management units (GMU) — Hunting and wildlife boundaries
Sources include ADF&G and other regional authorities.