Miningsurvey using LiDAR

Transcription

1 Miningsurvey using LiDAR

2 Table of contents Objectives of LiDAR and GIS based Mining Understanding of LiDAR Technology Introduction Terrestrial and Airborne LiDAR Mining Solutions using LiDAR Approach and Methodology Deliverables Roles and Responsibilities Benefits

3 Objectives of LiDAR and GIS based Mining Central Repository of lease wise reserves details at DMG Office Transparency in Operations and Governance Exploration and Resource Evaluation Determination of ore body, pit and void volumes for mine planning Periodic determination of pit, bench, pre-strip and spoil surface volumes for auditing payments to earthworks contractors Periodic determination of stockpile volumes for inventory and accounting purposes Environmental planning, monitoring and reporting for the mining operation and the neighboring region

4 Understanding of LiDARTechnology Till date theodolites and total stations has been the first choice for the surveyors. A laser-scanning instrument works on the principle of LiDAR(Light Detection And Ranging). The scanner emits laser rays, which hits the object to be captured and comes back to the scanner. Depending upon the total traveling time the scanner calculates the point distance in X, Y & Z. Laser scanner enables the surveyor to collect the data at lightning fast speed with accurate 3D survey data. Within a very short period of time the scanner collects billions of points (pointcloud), this point cloud data can be used to create 3D models for a wide variety of spatial and volumetric tasks. The Laser Scanner is setting the standard for 3D laser scanning in all fields especially mining for capturing and documenting existing conditions. The multisensor platform is ideal for high speed data acquisition, and the integration of Photogrammetric cameras provides accuracy and completeness of projects demanded by the customers.

5 The terrestrial laser scanner system consists of a high performance long-range 3D laser scanner, associated operating and processing software, and a calibrated and definitely orientated high-resolution digital camera. Open Pit and Tailings In the mining industry, it is imperative to have a fast and effective way to collect high resolution survey dataof engineering quality for open pit mining and tailings ponds. Ground-based scanning and conventional surveying methods take days or weeks which can interfere with production activities. The safety of personnel who collect the data is often a major issue in areas of surface mining activity where there are large heavy vehicles constantly on the move.

6 Terrestrial laser scanning(tls)

7 Terrestrial laser scanning(tls) Working 10,000 points per second Scanning

8 Why LiDAR Technology? LiDARscanning is far safer than conventional surveying methods and takes only a fraction of the time. The speed at which data is collected minimizes delays to the mining schedules and processes. For example, operational mine faces can often be surveyed in the time during shift change, causing zero delays in production. The LiDARsolution is ideal for finding differences between two time periods to accurately monitor the changes in the terrain. Data from the LiDARsolution dovetails cleanly into existing data workflows to produce deliverables including engineering drawings, asbuilt, contours and volumes.

9 Approach and Methodology Solution Process Flow Based on the GIS base map for Area of Interest, the surveyors would perform Land Survey (DGPS, Total Station, etc). LiDARSpecialists will take the mine surveys and post process the collected data to make a virtual 3D model along with a customizable Fly-Through. Surveyors would then communicate this information to generate base map layer concerned mines.

10 Approach and Methodology LiDAR data will be providing Volume Computation, Contour Data, Cross Sectional Areas, and other relevant information regarding mines. GIS Database will enable the management/user to analyze daily/weekly/monthly/yearly data and make appropriate policies. Surveyors would do same procedure for newly leased mines. GIS application would present analytical information with graphical representation for better understanding and policy making.

11 Methodology (GIS Map Creation) Source data for land base mapping is High Resolution Satellite imagery and various ward and survey Topo maps. Before the capture process, image is registered to the DGPS points (10 cm accuracy) to achieve the desired positional accuracy. Field Survey Team captures features such as Building footprint, Road, Street centerline, Alley, Median, Cluster of Trees, Plot boundaries. Feature like Ward boundaries, Railway corridor, Utility features, Contours etc. are also captured. Input Data High Resolution Satellite Imagery Ward Maps Survey of India Topo maps DGPS survey points Railway corridor maps Utility Maps Output Format ArcGIS GeoDatabase

12 Using Terrestrial Sensors: LiDAR LiDAR Data Classification Typical work undertaken are 1) Ground Point Classification 2) Mining Classification and Vectorisation. 3) Lease Classification and Vectorisation. 4) Vegetation/Mineral Classification. LiDAR also has the capability to produce terrain products such as TIN, surface models, Contours, intensity images etc from the point cloud data.

13 Mesh model Before excavation

14 Mesh model After excavation

15 Combined mesh model Excavated area Unaltered area

16 Cross Sections with some measurements Surface before excavation Surface after excavation

17 Anticipated Benefits Benefits Swifter Delivery Time: Unlike aerial photogrammetry, LiDARsurveys do not require ground control targets, allowing mine surveyors to concentrate on other important operational activities -The project critical path to delivery of data can be much shorter and simpler, relying more on CPU computation time than on man hours LiDARsurveys are particularly well suited to time-critical applications, in terms of capture window and delivery time. For example: -Stockpile surveys that are required on the last day of the month, to coincide with the financial reporting period -Specific surveys where the capture window is either very limited or time critical such as pre or post blast, start or end of contract, ship or train loading, empty or new stockpile pads and blending yards Fast Capturing Speed: With capturing speed of ~10000pts/sec, it captures millions of points within a very short period of time whereas a Total Station captures one point/minute.

18 Easy to Operate: A surveyor with total station knowledge and little computer knowledge will find it easy to operate the laser scanner without any difficulties. Inclination Sensor: With inclination sensor there is absolutely no need to level the instrument. Range: A laser scanner can scan up to 1500 meters (radius), with a field of view of 360 (H) x 80 (V), there by covering a large area in single scan. Onboard Digital Camera: The scanner has High Mega Pixel onboard digital camera, which allows to pick up true color of the scene there by creating a virtual reality of the mine. It also helps in demarcation of coal blocks and geological investigations. Accuracy: The laser scanner can easily achieve an accuracy of mm during topographic survey, thereby providing accurate topodata. Better visualization and data processing (as compared to Tabular Data) for Decision Making through Spatial GIS database. Proper Land use planning can be done. Same database can be used by various authorities.

19 Project Deliverable will include: Deliverables Computer Aided Design/Drafting Topographical Map Production & Revision Digital Terrain Model Generation Cross Section & Profile Plans GIS LIS Implementation and Data Collection Data Conversion & Integration Volume Calculations Mines Department Submissions

20 Roles and Responsibilities Roles and Responsibilities will include: Sr. No Components n-code DMG Lessee 1 Location Details 2 Location GIS MAP 3 Image Procurement 4 Validation of GIS MAP 5 Image Digitization 6 Ordering process 7 Overall Schedule for Survey 8 Site Readiness Checklist 9 Order for individual Lease 10 Intimation to lessee for Survey with pre-requisite 11 Server for Setup 12 Software Deploy 13 Points of Contact Details of lessee 14 Site Readiness Intimation to lessee 15 Confirmation of site readiness 16 Mobilizing the Team 17 Site Team for co-ordination 18 Local Conveyance 19 Pre - Survey for LiDAR 20 Feasibility Report 21 Approval of feasibility 22 Field Survey and Data Collection 23 Field Survey Verification 24 Data Correction and Conversion 25 Database Preparation 26 Base Map Preparation 27 LiDAR Report 28 Work Completion Certificate 29 Invoice 30 Payment 31 Change detection survey schedule finalization

21 Work Flow Work Flow will include following steps: Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 Day 8 Day 9 Mine Location Detail Travel and Operational Planning Mine Plan Collection Operational Details from Mine Owner Pre-Survey Planning and Site Visit Electronic Total Station Survey LiDAR Survey LiDAR Survey LiDAR Survey (Only in case of exceptions)

22 Thank You