Start with disclosed terrain data
A bounded overview uses available public elevation sources. Optional local GeoTIFF or supported local-only LAZ inputs can provide more detail when their provenance and limits are understood.
Methodology and trust
Understand the evidence behind each terrain preflight.
A useful terrain screen keeps the evidence chain visible: source, bounded grid, working-cell size, calculation, finding, limitation and next check.
Analyze the bounded grid
The browser calculates elevation, slope, aspect, contours, modeled flow accumulation, wetness-screen and other terrain context for the represented area.
Keep limitations beside findings
Findings and reports retain source, resolution, method, assumptions, limitations and suggested next checks so screening is not mistaken for a final decision.
Data and control
Analysis runs primarily in the browser.
The first preflight does not require an account. Saving and sharing are optional and use configured project storage; private viewer links are the default. Uploaded GeoTIFF terrain is stored only with a compatible saved project, while supported LAZ analysis stays local. Read the privacy notice for storage, service-recipient and deletion details.
Responsible interpretation
Screening identifies questions, not approvals.
Use it to
- Understand broad terrain shape and relief
- Identify modeled slope, drainage and wetness patterns
- Prepare questions for field checks and specialist review
- Carry source and limitation context into the next conversation
Do not treat it as
- A survey or legal parcel record
- A flood, engineering or geotechnical determination
- A permitting or grading decision
- A guarantee that land is buildable
Inspect the evidence