3D Laser Scanning (Laser Radar) & LIDAR (Light Detection and Ranging)


RADAR

The acronyms RADAR stands for RAdio Detection And Ranging. These are devices that use infra-red-light projection to construct metric data from objects they are scanning. Laser scanners gather plane data using a laser beam pointed at the surface and then convert that data into a point cloud. RADAR is a cone shaped signal fanning out from the source. It uses longer microwave frequencies which have lower resolution but the ability to collect signals with reduced impact from environmental obstructions

LIDAR (Light Detection and Ranging)

LiDAR is one of the most important tools in the commercial drone industry. LiDAR  is typically a collimated light beam with minimal divergence over long distances from the transmitter, basically LiDAR is a remote sensing technology: sensors that are mounted to drones send a pulse from a laser to collect measurements, which can then be used to create very precise models (including 3D models) and maps of objects and environments.. LIDAR uses lightwave frequencies which have a shorter wavelength enhancing the capability of collecting data with high precision.


LIDAR measures distance by measuring the time that it takes to get the laser pulse to the measured object and back.  By doing this many many times per second, you are able to get a accurate distance and gain enough information to be able to tell quite a bit about the object that you are looking at.

How we use LiDAR


We at Map & Allied Deploy LiDAR in the following industries and for the following solutions;

  1. Land Surveying:
    Airborne Lidar scanners can be used to create a digital terrain model (DTM) or digital elevation model (DEM). DEM stands for digital elevation model which has z coordinates value along with x and y. Elevation values are used everywhere, in roads, building, bridge and other.  Drones are cheaper, safer and faster for small terrain surveys, this technology has replaced photogrammetry method which was time consuming.

2. Power line inspection:
Power line inspections are an expensive, time-consuming affair. Drones have revolutionized this industry by providing quieter, cleaner, cheaper option for aerial power line inspections: drones. Detailed information on power lines and distance between poles can be extracted from the point cloud. This enables surveyors to analyze the detailed structure of the power line corridor including vegetation, roads and houses and to identify potential risks

3. Mining:
It can be used in mining to measure ore extraction space. This is calculated by comparing surface data to previous scans. Drones are often used to survey mines because a faster and more economical option than surveying using aeroplanes. Terrestrial laser scanners and mobile mappers equipped with sensors are also used to survey mines.

4. BIM: GIS is a valuable tool that helps in the planning, organizing and subsequent growth in the energy and utilities industries. The effective management of energy systems is a complex challenge. GIS has enormous potential for planning, design and maintenance of facility. Also it provide improved services and that too cost effectively.

5. County Government

LiDAR is accurate and quick to survey, it helps municipality to know where things are and what are the changes happened in the city. City assessment department can use LIDAR to find out what are things build up in the public backyard.

 

6. Airport Infrastructure

LIDAR is used to capture features in the airport like runway, terminal building, hangar and other objects. This allows airport authority to manage and operate airport system smoothly

7. Topographic and bathymetric surveys:
LIDAR is very accurate and precise technology which uses laser pulse to strike the object. Topographic Lidar maps the land with a near-infrared laser, while bathymetric Lidar uses water-penetrating green light to measure the seafloor and riverbed. The power is on LiDAR’s capacity to penetrate through the object and detect the surface value.

8. Tourism and Parks Management: LiDAR DEM is used to plan the park and tourism area. High accurate surface models help to find the best area to have playground, trees and walking trail. 3D image of the park, generated from LIDAR technology helps for the future growth of the park.

9. Modelling of the Pollution:  The fact that LiDAR are short wavelength operating in ultraviolet helps to image the object which are in same size or larger than the wavelength. So, LIDAR can detect pollutant particles of carbon dioxide, Sulphur dioxide and methane. This information helps researched to create pollutant density map of the area which can be used for better planning of the city.

10. 3D Building Models

We offer a suite of 3D building products for 3d visualization, GIS applications and architectural modeling. Our products are accurate, geo-registered (x,y,z) models provided in formats ready for most 3D application tools. Accurate geo-registered 3D “block-style” building models that provide users with block geometry and elevations.

  • Accurate geo-registered (x, y, z) models
  • Common coordinate systems
  • Block geometry with flat roof elevations
  • Multiple building roof elevations captured every 33 feet or greater
  • Standard building models can also be generic or photo-real textured
  • Common output model formats:
  • ESRI z-shapefiles, Google KML, AutoCAD (.dwg/.dxf), SketchUp (.skp), Openflight (.flt)