Import waypoints, tracks, and survey points from your GPS unit. Supports GPX (Garmin, Trimble, etc.), CSV with coordinates, and NMEA sentence logs.
📡 Drop GPX, CSV, TXT, or NMEA file here Formats: GPX, CSV/TXT (id,N,E,elev,desc or name,lat,lng,elev), NMEA
Enter the lat/lng of a known reference point in your survey data, and its local grid coordinates. All other points will be placed relative to this point.
Tip: Use the 📍 Identify tool to click the reference point's location on the aerial photo and get its lat/lng.
🔧 Coordinate Alignment Tool
Align imported survey points to true state plane coordinates using known control points.
1 point = translation only. 2 points = translation + rotation.
Imported survey points: 0
Control Point 1 (required)
Control Point 2 (optional — enables rotation)
📐 Vertical Datum Calibration
Compares your imported survey elevations to USGS 3DEP LiDAR at the same XY locations.
Computes the systematic vertical offset and applies a correction for sub-inch consistency.
Points used: imported survey points with elevations that have been placed on the map.
LiDAR is queried at 1-meter DEM resolution from USGS 3DEP.
Click "Run Comparison" to query LiDAR elevations at all imported survey points