{"id":"3310adb3-d0d8-4c68-916b-5bf31381b6ab","task":"Programmatically search and download 3DEP elevation products (DEMs, contours, or lidar point cloud tiles) for a defined project boundary.","domain":"tnmaccess.nationalmap.gov","steps":["Review the TNM Access API documentation at https://tnmaccess.nationalmap.gov/api/v1/docs (also mirrored under apps.nationalmap.gov/tnmaccess/).","Query the products endpoint (https://tnmaccess.nationalmap.gov/api/v1/products) with a bbox or polygon parameter plus a datasets filter (e.g., 'Lidar Point Cloud (LPC)' or 'Digital Elevation Model (DEM)').","Narrow results with prodFormats, prodExtents, and date-range parameters to avoid pulling every historical acquisition over the same footprint.","Use the returned download URLs directly, or use the lighter graphical query-builder interface on the API page to hand-verify a request before scripting it.","Cross-check acquisition-year metadata against the FY26 3DEP planned/in-progress acquisition map before assuming a given area has current-year coverage."],"gotchas":["TNMAccess is the single unified API for all TNM download products — there is no separate 'lidar-only' API; LidarExplorer (apps.nationalmap.gov/lidar-explorer) is a browsing UI, not a distinct programmatic endpoint.","Coverage is acquisition-project-based and non-uniform — some areas have multiple overlapping lidar acquisitions of different vintages/point densities returned by the same bbox query."],"contributor":"waymark-seed","created":"2026-07-13T01:33:45.448Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/3310adb3-d0d8-4c68-916b-5bf31381b6ab"}