Engineering Surveying (Road/Route Designing and setting out)
Engineering Surveying is basically a survey during/on engineering works. It consists of preliminary detail surveying for designing and setting out of the designed engineering utility to its respective position on the ground. Also Control and Monitoring of the design during construction/implementation and finally the asbuilt surveying of the final structure/implemented design. The Asbuilt survey updates the final implemented design on the ground on which shows the all changes during construction due to some factors like nature of the location/ground which caused some design to change. And finally, production of the final design is sketched and presented to the client.
Survex limited is good and with experienced Engineering Surveyors performs and produces a quality work

Earthworks
Earthworks includes picking data necessary for Volume computation. We also provide the services for determination of the quantity of materials (volume) of any Engineering works like Road Construction projects, Mining projects, Dams etc.
UAV/Drone Surveying
UAV stands for Unmanned Aerial Vehicle in other term it is called a Drone. UAV/Drone Surveying is the surveying on which data are captured by an aerial device with the camera sensor. Through Photogrammetry data are captured by very precise cameras on with the results are photos (Mosaics) from which are processed to obtain reliable information of the surveyed area. After processing, the followings can be obtained:-, Position information (N.E.Z), Digital Terrain Models (DTMs), Contours, etc.

This is the very precise and time effective surveying method on which data are captured and processed within very short period of time to ensure earliest delivery of surveying data to the client.
Survex limited is well equipped with drone devices and experts to perform the tasks requiring drone services. We also hire and Sell Drone instruments.
LiDAR Survey
A LIDAR instrument consists of a laser, a scanner and a GPS receiver mounted on a platform. This platform may be mobile or stationary, aerial or terrestrial, based on the needs of the application, the laser, scanner and GPS receiver are the only constants.
There are two types of LIDAR; topographic and bathymetric. These are explained in more detail below:
- Topographic: Topographic LIDAR measures distances on land using a near-infrared laser. This is essential for the majority of civil engineering, roadwork and mining operations, which require measuring distances on land.
- Bathymetric: Bathymetric LIDAR measures distances in aquatic environments by using a water-penetrating green light laser. This type of LIDAR is commonly used in civil engineering and roadwork applications that require working with underwater environments, such as under bridges.
But how does LIDAR surveying work on a technical level? LIDAR works by pointing a laser at a target surface on the ground or under the water. The surface reflects the light back to the LIDAR equipment, and the sensor records the reflected light to measure the distance traveled. This data is then combined with the position and orientation of the LIDAR equipment, which is measured using the GPS receiver and internal measurement systems. This creates a set of three-dimensional spatial coordinates that include latitude, longitude and height, creating a combination of data that is called a point.


Who Uses LiDAR?
LIDAR is used in a wide range of industries, primarily those involving land management and planning efforts. The construction and mining industries are particularly avid users of LIDAR, favoring it for its incredible speed and flexibility in a wide variety of terrains.
Laser Scanning Surveying
-Terrestrial laser scanning (TLS), mobile laser scanning (MLS), a hand-held laser scanning
Terrestrial laser scanning (TLS), also referred to as terrestrial LiDAR (light detection and ranging) or topographic LiDAR, acquires XYZ coordinates of numerous points on land by emitting laser pulses toward these points and measuring the distance from the device to the target. The number of measurable points within a certain period is much larger than those of Total Station (TS); a modern TLS device can measure 104–106 points per second with an accuracy of 10−1–100 cm.
Terrestrial scanning uses a ground-based or tripod-mounted light radar to create high resolution 3D images of surfaces and objects. LiDAR measures a scanned object by emitting laser pulses and recording the subsequent intensity of their return when reflected off it. Scanning can be performed over kilometers with sub-centimeter precision. Terrestrial scanning is commonly used for heritage documentation, 3D topographical surveys, accident sites, confined spaces survey and Mechanical, Electrical and Plumbing (MEP) models.


Mobile laser scanning (MLS): Unlike Terrestrial scanning, which is performed from a static position, mobile laser scanning collects geospatial data from a mobile vehicle fitted with LiDAR, cameras and other remote sensors. This mobility can be provided by cars, trains, trucks, manned and unmanned aerial vehicles and boats.
Mobile laser scanning is used in emergency response situations to quickly assess the conditions on the ground, as well as for popular mapping projects such as Google Maps and Street View. Location services on smartphones rely on mobile mapping to plot the position of the phone.
We have the experience and the expert survey, planning and design team to provide mobile laser scanning services to all kinds of project.
Topographic Surveying
Topographical surveying is the survey to determine the nature of topography of the area. It’s a Survey on which the results shows the existing situation of the area before implementing anything new. The resulted Topographical map shows all existing features both man made and artificial ones. It is accompanied by production of Contours which shows the Nature of Terrain of the existing Surface/area.
Topographical Survey involves precisely correction of horizontal and vertical information of features and points around the entire area. Topographical Survey can be conducted by normal ordinary methods (For small areas) like using Total stations and for medium area GNSS equipment is used for precise and time effective of the results. But for the largest areas, a most precise, quick and advanced technology method like using Drones or LiDAR is mostly preferred.

Survex is well equipped and performs any kind of Topographical Survey using the most technological equipment to ensure precise output at short period of time.
We have Software and Experts for quick processing of topographical data and production of Topographical Map and other outputs at a time.
Controls Establishment
Geographic positions are specified relative to a fixed reference. Positions on the globe, for instance, may be specified in terms of angles relative to the center of the Earth, the equator, and the prime meridian. Positions in plane coordinate grids are specified as distances from the origin of the coordinate system. Elevations are expressed as distances above or below a vertical datum such as mean sea level, or an ellipsoid such as GRS 80 or WGS 84, or a geoid.
Land surveyors measure horizontal positions in geographic or plane coordinate systems relative to previously surveyed positions called control points.
Control points also Known as Reference points, these are the base of any surveying work. Any Control point consists of Position information stating Its Coordinate System and Order type. There are three types of Orders of control points;-First Order; Second Order and Third Order. Their difference being:-
- Monumentation type
- Occupation time during establishment, 1st Order having long occupation than the rest
- Post processing Methodology i.e. Software used etc.
- Accuracy: 1st Order being the most Accurate followed by 2nd Order and last is 3rd
Survex Limited is capable on establishment of any type of Order of Control Points. We are well prepared with modern equipment, software and experienced experts on designing, observation and post processing
Powerline Surveying
The Survey conducted on electric projects. This involve new route design, As-built Survey and Periodic assessment of the powerline (Normally for High Tension Powerlines).
New Route Design: Survex offer the route design using modern GNSS receiver with L-Band capability to get position under standalone mode. We have GNSS receivers with Atlas and TerraStar global standalone correction services which archives up to 4cm RMS accuracy on which enable the Surveyor to continue surveying without the limit range of RTK corrections from the Base. Therefore, it reduces the time of work and delivery of the outputs on time and at good accuracy.

As-Built Survey: After design implementation, the as-built survey should be conducted to update any changes on the design also surveying of all types of electric poles established. Survex Using the Mordern GNSS with L-Band capability makes it easier.
Periodic-assessment off High Tension Powerlines:- High Tension Power line have to be maintained and assessed periodically to ensure safety. Periodic maintenance are done by LiDAR survey as after data correction from the powerline we can detect Sag, Leakage, Damage, Power loss, etc.
Hydrographic Surveying
Hydrographic surveys involves measuring of the depth and bottom configuration of water bodies. It is also known as bathymetric Survey. It is the survey which determines the nature and topology of the water body’s bottom.
Bathymetric survey provides information for a number of purposes, including seafloor structural construction, laying pipelines and cables, dredging, anchoring and understanding fish habitats. Also it used in many different types of research including flood inundation, contour of streams and reservoirs, leakage, scour and stabilization, water-quality studies, dam removal, biological and spill, and storage, fill in reservoirs and ponds etc.
Also the bathymetric data is used to update nautical charts and develop hydrographic models of which are vital to navigating the ocean and our nation’s waterways.
Multiple methods are used for bathymetric surveys including multi-beam and single-beam surveys (Eco-sounders), Acoustic Doppler Current Profilers (ADCPs), Sub-bottom profilers, and the Eco-mapper Autonomous Underwater Vehicle.


Supply, Commission and Training of Surveying Equipment, Software, Tools and Accessories
Survex do supply, commission and train of any kind of surveying equipment, Software, tools and accessories.
We do train software and instruments below:
- Arch GIS
- AutoCAD Civil 3D
- Post Processing Softwares
- Drones

- LiDAR Systems

- GNSS Receivers
- Total stations
- Automatic Levels
- Handheld Gps and GNSS