Land Survey Screening

Great-circle distance (miles, km, feet, nautical miles) and initial compass bearing between two latitude/longitude points.

Ground elevation in feet and meters at a US latitude and longitude from USGS 3DEP, with data-coverage check.

Is a US point inside a mapped wetland? National Wetlands Inventory type and size, as a permitting heads-up.

FEMA flood hazard zone at a US latitude and longitude: high-risk (A/AE/V), moderate or minimal, with base flood elevation.

Area in acres, hectares and square meters and perimeter of a polygon from lat,lon vertices, e.g. a parcel or flight area.

First-look site screen for a US coordinate: elevation, FEMA flood zone and mapped wetlands combined, with flags.

Sunrise, sunset, civil twilight and day length for a latitude/longitude and date, in UTC and a chosen UTC offset.

Elevation profile along a line between two US points: relief, ascent, descent, steepest grade and a flat/steep verdict.