Written by the counter team at Multi Trade Combines — 35 years supplying NE workshops. A total station combines electronic distance measurement and angle reading into a single instrument — faster and more accurate than a theodolite + tape combination. This guide covers the site setup procedure used by surveyors on NE India roads, bridges and building projects, with tips for monsoon and hill-terrain conditions.
Written by the counter team at Multi Trade Combines — 35 years supplying NE workshops.
Many engineers and surveyors in Northeast India encounter a total station for the first time on a road or bridge project and need to go from unboxing to usable field data quickly. This guide covers the standard field procedure used on NE India government and private projects — useful whether you are setting out a building grid in Guwahati, running a road alignment in Meghalaya hill terrain, or doing hydrographic survey setups near the Brahmaputra. Browse our full Surveying Instruments catalogue for available models.
9 steps from tripod to usable coordinate data
Monsoon (June–September): Avoid instrument setup during heavy rain. A light drizzle can be managed with a temporary canopy over the instrument, but moisture in the EDM optics causes range errors. Dry the instrument with a blower before the next use. Leeches and insects are a practical hazard for survey crews in Assam and Meghalaya forest areas — wear long socks and check the tripod feet before picking up the instrument.
High altitude (Arunachal Pradesh, Nagaland): At 1500 m and above, the EDM atmospheric correction changes. Enter the current temperature and pressure into the instrument's correction menu — a 10°C temperature change or 100 m altitude change introduces measurable range errors on long distances. Most modern total stations do this automatically if equipped with a barometer sensor.
Brahmaputra floodplain (Assam lowlands): Setup on riverbank sandy soils can be tricky — the tripod legs sink during observation if the soil is wet. Use footpads or stake the legs. Heat shimmer over bare sandy ground in April–May reduces EDM reading quality on distances over 200 m; observe in early morning or after 16:00 when shimmer is minimal.
On steep terrain, setting up the instrument level is more challenging because the tripod legs need different extensions. Always set the tripod legs first — two legs uphill, one downhill — so the instrument plate is roughly level before you begin fine-levelling with the foot screws. Use a long plumb bob line or the built-in laser plummet carefully on sloped ground, as wind and heat shimmer at altitude affect laser plummet accuracy. Take extra care that the tripod feet are seated on firm ground, not loose shale or monsoon-softened soil.
A total station adds electronic distance measurement (EDM) to the angle-measuring function of a theodolite. This means it can measure the 3D coordinate of any point it is pointed at without a tape measure — just a reflector prism. For road alignment surveys, this eliminates the chaining crew and dramatically speeds up work. A theodolite requires separate distance measurement with a tape or EDM unit. For all practical purposes, new survey projects in NE India use total stations; theodolites are retained primarily for older operators or specific angle-only checks. See our comparison at our guide on <a href='/guides/how-to-choose-a-total-station.html'>how to choose a total station</a>.
Most total stations store observations in internal memory or a data card. Before leaving a remote site each day, download the raw data file to a laptop or USB stick. If a laptop is not available, photograph the screen display at each measurement — a time-consuming backup, but better than losing the data. Our team can advise on total station models with Bluetooth or Wi-Fi data transfer capability, which eliminate the cable connection step.