Prepare the site visit with a terrain overview.

A preliminary workflow

Confirm the supported area and boundary, then inspect the terrain outputs and their source information. Use a profile and possible flow paths to organise questions for the visit.

Record assumptions that need verification: structures not represented in the raster, changes since the survey, unresolved ground conditions and truncated upstream context.

Judge suitability against a real job

Try a representative site and evaluate whether the available outputs fit your process. Do not claim survey-grade accuracy or time savings without checking them in your workflow.

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Check the location before starting

The US pilot accepts user-drawn study areas within the contiguous-US pilot extent. The worker checks for usable native USGS project-level 1 m elevation data. Coverage is incomplete and may fail for a selected area; no coarser dataset is silently substituted.

Baden-Württemberg remains a separate established German workflow with official ALKIS parcels. US address points and drawn areas are not official parcel boundaries.

What terrain screening cannot determine

Terrain screening does not simulate rainfall, infiltration, sewer capacity or the hydraulic effects of walls and culverts. It cannot predict flood depth, size a drainage system or confirm that a property is safe to build on.

A local catchment is limited to the analysed area. Contributions from beyond its boundary can be unknown. A modelled boundary crossing is not evidence of a real drain or drainage outlet.

Common questions