Abstract
The core principles of collecting good quality data from site for creating CCTV inspection reports including some explanations of how to avoid common mistakes.
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The PLR Naming Convention
Most global drainage inspection standards include a system for naming pipes based on either the upstream manhole ID or a combination of both the upstream and downstream manhole IDs. The Manual of Sewer Condition Classification (MSCC) defines the naming convention for WRc pipe and sewer inspection using the Pipe Length Reference (PLR) system at all times:
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Other than that, the logic is exactly as described here.
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Good Site Drawings
Everything described above regarding avoiding problems with data in software applications can be avoided by taking care and time to create good quality site drawings. The process described here considers a domestic CCTV inspection but the recommended logical approach can be extended to any type of CCTV inspection.
The golden rule of CCTV inspections is to always start with a site sketch before getting the camera system ready to go, and take time to make it useable. If you do your job correctly on site and deliver you drawing and inspection dat aback to the office in a good shape, then nobody will ever have to call you up a few days later and start asking some questions while they are trying to write th the report and make some rehab recommendations.
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That’s it, your job as a CCTV surveyor is complete provided that the video files and data that you have recorded on your CCTV camera match up with this drawing. Based on the information reported here, the office rehab manager can either go with your recommendations or create their own, but regardless of which way they go, they have enough information in the video files, pictures and (mots most importantly) the very good site sketch to make all the good and proper quotations needed for this job.
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Understanding STC25 Manhole References
It is common when working with water company asset records to see STC25 manhole references like NZ24567401 (made up example) and although this seems like a mad set of numbers and letters, the way these are constructed is actually quite simple and is described in Appendix A of the MSCC.
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To understand the STC25 reference, we must split it up into its 5 constituent parts:
NZ 24 56 7 4 01
NZ = the 100km grid tile that you are currently in as described and specified by the Ordnance Survey. Remember 100km = 100,000 metres.
24 = the 24th kilometre across the NZ box from the bottom left corner starting at 00.
56 = the 58th kilometre up the NZ box from the bottom left corner starting at 00.
7 = the 7th 100m segment across the km grid square starting at 00.
4 = the 4th 100m segment ip the km grid square starting at 00.
01 = numeric counter as described previously.
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OS grid tiles.
From this, we can deduce that the NZ 100km grid tile is in the North West of England, and if we count 24Km East from the bottom-left corner of the tile and 56Km North from the bottom-left corner of the tile, then we hit the red cross:
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WinCan VX Map includes an option to click on a point on the screen against a given background location plan and the appropriate STC25 reference will be generated for you. How does it doe do this? Because we know the coordinates where the mouse was clicked on the screen and the first 8 digits are geo-spacial so they are not in a question or open to modification by the user.
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