LiDAR

LiDAR, 'Light Detection And Ranging’ works in much the same way as sonar and radar, only by using a laser that is fired from a sensor or scanner. The laser then bounces back from the objects it hits and the sensor records the time it takes to return – with a simple equation using the time, multiplied by the speed of light (300,000km per second) and divided by two to counter the return journey, used to determine the distance traveled.

The process of firing the laser multiple times enables the sensor to see through topography such as Road, Buildings, Trees, Structures, etc,

UAV Based LiDAR

Drone LiDAR is used for aerial surveying operations, a LiDAR drone incorporated a GPS/GNSS system in order to determine its exact position, along with an inertial measurement unit (IMU) to calculate for the movement of the Drone (in terms of pitch, roll and yaw as it bounce in the air). A high-end computer is to process all the data, possibly with pre-processing and Post Processing software for Geo-referencing, colorizing point cloud, convert data to multiple formats (las, laz, rcp)  extracting ground 

Mobile LiDAR

Mobile surveying facilitates the collection of spatially correct data on a large scale. Rather than survey individual buildings or areas, mobile mapping systems can be deployed to map entire cities or hundreds (even thousands) of kilometers of transportation corridors. Imagine collecting a high-resolution data-set of an urban neighborhood in a few hours, or generating an engineering drawing of 60 km of highway in a single day. Mobile mapping systems make it happen.

​Mobile LiDAR technology presents multiple benefits to transportation agencies, including safety, efficiency, accuracy, technical, and cost.  It can simultaneously acquire imagery and scan data.  ​
Mobile LiDAR Systems can provide survey/engineering quality data faster than static scanning. Airborne systems  generally do not provide survey/engineering quality data.   Mobile LiDAR systems have been utilized along navigable corridors for a variety of applications including earthwork quantities, slope stability, infrastructure analysis and inventory, pavement analysis, urban modeling, and railways. ​

Leica Pegasus: Two

Leica Pegasus: Two, Mobile LiDAR can be used to obtain highly accurate 3D point data by safely driving a collection vehicle at highway speeds.  The designers and contractors transition from 2D workflows to 3D model-based design and asset management, the ability to make efficient use of mobile LIDAR will only increase.

Application-specific workflow solutions: 
Pegasus:MapFactory for AutoCAD (or) ArcGIS software suite is the complete vectorization for the Pegasus:Two mobile sensor platform, covering the end to end workflow – from data collection to feature extraction. The interface combined with the semi-automated feature extractions allows to obtain the project deliverable fast.

Additional Optional Features:

Pavement Camera – Leveraging the most advanced low noise laser profile with the innovative pavement camera of the Pegasus:Two, extends analysis functions
  • Pavement crack index
  • IRI index
  • Road sign extraction
  • Clearance analysis
Ground Penetrating Radar – Detect buried assets and uncover potential dangers before digging to avoid damaging the utility infrastructure.
  • Density change for water network leakage
  • Cavities detection
  • Buried objects

​Area of Application

  • Railway - Design, Maintenance, Asset Management & Monitoring​
  • Roads & Highways - Design, Maintenance, Asset Management & Construction
  • Industrial and Infrastructural Development, SEZ
  • Environmental (Water Supply and Sewerage)
  • Irrigation & Dam
  • Smart Cities - Design, Planning & Construction
  • Oil and Gas Pipeline Network
  • Power Plants (Hydroelectric, Solar and Wind Energy)
  • Utility Services (OFC, Cables & Etc)

Goodland Surveys's Project Experience : LiDAR Survey

We have surveyed and delivered 100+ highway projects (108 and counts) from 2016 to 2019 to our clients (Consulting Engineers, Construction Companies & Government Sector).  The projects are included pre-bid, DPR, Construction Re-engineering, Inspection, TOT and Smart Cities.  There is water pipeline project was done with Mobile LiDAR which is planned along a road corridor.  We used Mobile LiDAR for Road Junctions, Tunnel Survey, Railway (High-Speed Rail Corridor)

We combine the LiDAR Technology with conventional survey methods to deliver the data 100% complete without any shadow area.   The advantage of conventional method is assuring the accuracy and quality of LiDAR data

Railway Alignment Survey & Asset Mapping by using Mobile LiDAR Survey

LiDAR Survey Workflow

 Research our clients requirement:

Government entities,i.e., NHAI or other State Government Highway Departments have ready access to their set of specifications. These documents are more fluid than many believe, especially as they relate to emerging technologies like mobile LiDAR.  These requirements also have specific survey and mapping sections.  Designate a lead to read and understand these requirements. Knowledge of applicable specifications will help guide and properly constrain our workflow.

​Establishing Ground Control Points
Good project plan for any survey requires proper geo-referencing.  Mobile lidar, even though supplemented with GPS and inertial measurement unit (IMU) systems, still needs to be checked against higher accuracy reference points. This means establishing visible control targets and referencing this control to the appropriate reference network.

Data Acquisition
Mobile LiDAR Data acquisition is required several DGPS observation.  Rain or High Temperature will affect the data collection.  A well trained surveyor cum operator shall drive and monitor the data collection.  

Data Processing

Once the Ground Control Points and Mobile LiDAR Data is ready for processing, the following Processing and Mapping tasks shall be done ​
  1. Post processing is executing by combination of few software and different workflow
  2. Trajectory Adjustment is primary and important processing,  We do Inertial Explorer® (IE) to get the position, velocity and attitude accuracy our application requires. The tightly coupled integration of GNSS and IMU data delivers precise results.
  3. Extracting the data of images and Scan files, Geo-reference of images and LiDAR data,  colorizing the point cloud, export to different type of formats (las, laz, rcp files)
  4. Point Cloud Data Matching (Manual Trajectory Adjustments) Manual GCP Adjustment of Point Cloud
  5. Line works, Preparing CAD files from Point Cloud (las to dwg/dgn file)  CAD file includes all features that are visible from the air,  breaklines,  features such as paint striping, utility access panels, edge of pavement, water features, and etc.
  6. Point Cloud Data Classification (Ground, Trees, Water, Building, Power lines)
  7. Preparing DEM & DSM, Contour drawings and Ground Levels
  8. Incorporation of conventional survey data where the LiDAR creates shadow region
  9. Field check of drawing shall be done by a senior surveyor and update the same 
  10. Delivery of Drawings, Reports, LiDAR Data set and necessary viewer software

Deliverable

  • Field Survey Report
  • DGPS Data Processing Report
  • List of Control Points
  • Coordinate Projection Details
  • Datasets - Point Clouds (Georeferenced, Colourized and Ground Classified)
  • Imagery (Videos, Still Images & Viewer Software)
  • Modeled Data - AutoCAD Compatible Topographic Survey Drawing files
  • Culvert, Minor Bridge and Major Bridge Details in AutoCAD Compatible Drawing file 
  • Final Project Report - includes all of the final deliverables and the associated required documentation.
We are serving clients throughout India and few abroad countries.  Contact us today to take your project to an error-free level while saving lots of money along the way.
E-Mail: 
​goodlandgeo@gmail.com
goodlandsurveys@gmail.com
Call us
93503 17939
​94440 37663