Survey Tools
Ten free, professional browser-based tools by BTPL — built by surveyors, for surveyors. No registration and no upload: every calculation runs locally in your browser, and all of them are bilingual English/हिन्दी.
Coordinate Converter
Single-point and bulk UTM ⇄ Latitude/Longitude conversion with 24 reference ellipsoids (including the Everest 1830 family), DD/DM/DMS formats, CSV & Excel import, column mapping, map preview, KML/KMZ and professional PDF reports.
Distance & Area Calculator
Geodesic distance and bearing between two points, and the perimeter and true area of a whole boundary — from latitude/longitude or grid coordinates. Areas in hectare, acre, guntha or a local unit you define.
Bearing & Azimuth Calculator
Whole-circle and quadrant bearings, grid bearing and convergence, bearing-and-distance to coordinates, included and deflection angles, and a full traverse with misclosure and Bowditch adjustment.
Point File Converter
Read CSV, TXT, Excel, Leica GSI, Sokkia SDR, LandXML, KML or GPX; re-order the columns, convert between latitude/longitude and UTM, and write CSV, TXT, DXF, KML, LandXML, GSI or GPX.
Survey Unit Converter
Length, area, volume, angle and speed — including the Indian land units fixed by statute — plus slope, gradient and map-scale conversions, and your own local unit such as bigha.
GSD & Drone Flight Calculator
Ground sample distance, image footprint, flight-line spacing, photo interval, photo count, flying time and batteries — from your own camera's sensor figures. Or enter the GSD you need and get the altitude.
Level / RL Calculator
A level book in the browser: reduced levels by height-of-instrument or rise-and-fall, the arithmetic checks worked out, closing error against the benchmark and the correction distributed over the setups.
Chainage & Stationing Calculator
Read and write chainages in any style, add and subtract them, and work along a real alignment: the chainage and offset of any point, and the coordinates to set out at any chainage.
Curve Setting-Out Calculator
Circular curve elements with Rankine deflection angles and chords, clothoid transition curves with shift and spiral offsets, and parabolic vertical curves with the summit, K value and level at every station.
Telemetry Extractor
Pull the flight track out of a DJI video or its SRT, a GPX, KML/KMZ, CSV or NMEA log, and write CSV with UTM and real chainage against your design alignment, GPX, GeoJSON or KML. The video is read in place — a multi-gigabyte clip is never uploaded.
Coming next
The platform keeps growing. Still on the list:
Want one of these sooner, or something else entirely? Tell us what would save your team time.
Need Professional Survey Support?
From control establishment to UAV/LiDAR mapping and engineering deliverables, BTPL can support your project.