CCTV Surveys
A CCTV Survey object contains information related to a single survey of a pipe in a particular direction. Each CCTV Survey object may be associated with a single pipe, and each pipe may have many surveys linked to it (for example upstream and downstream or at different times).
InfoAsset Manager assumes that the main structural information about the network is provided by manhole surveys. Although good for structural and connectivity information, manhole surveys are unable to give detailed information about pipe condition. This information is generally collected by using Closed Circuit Television (CCTV) surveys.
- imported from Examiner or PACP/LACP data or via the Open Data Import Centre.
- created as scheduled tasks. Please refer to the Digitising Network Objects and Scheduled Tasks topics for further information.
- entered manually in the CCTV Survey Grid View in the Survey Grid
. Please refer to the Digitising Network Objects topic for further information.
By default, CCTV surveys are displayed on the GeoPlan as a thick grey line displayed behind the associated pipe. If the full geometry of the CCTV survey is not known the following display rules apply:
- If the associated pipe is found, but the survey direction is not known, the survey is drawn in the middle of the pipe with a length of zero
- If the associated pipe is not found, the survey is drawn at the upstream node with a length of zero
- If the upstream node is not found, the survey is drawn at the downstream node with a length of zero
- If none of the above are found, the survey has no geometry and is not drawn
The location of surveys with zero length can be found by selecting the survey in the grid, right clicking on the GeoPlan and selecting Zoom to selection from the context menu. A symbol can also be added to the CCTV theme to aid with location of zero length surveys: the symbol will be drawn at the survey location drawn according to the rules above.
Once the survey data has been imported or created, validation may be carried out to ensure that survey data is appropriate before it is used to update the network.
Checks are made that:
- CCTV Survey data (Start / Finish Manholes and Direction) is consistent between survey and associated pipe
- CCTV Survey upstream and downstream nodes exist in the network
Inference can be used to set the Link Suffix field for CCTV surveys with this record missing. The link suffix is inferred from the suffix of a single pipe with the same upstream and downstream node as the CCTV Survey.
For surveys that have not already been associated to a pipe, the Joining Selected Surveys with Pipes tool can be used to carry out associations by matching the PLR / Asset ID field of the survey to the Asset ID field of a pipe.
For surveys that have been carried out for a run of pipes and have intermediate manhole records:
- The Update Network from CCTV Survey tool can be used to create nodes at defined observation code locations, either as lateral nodes or as nodes inserted into existing pipes.
- The Split CCTV Surveys tool can be used to divide the survey into new surveys that can each be associated with a single network pipe.
Calculation of defect scoring can be carried out automatically in InfoAsset Manager. The defect scoring used will be consistent with the chosen CCTV coding standard set by the user.
Subsequently, the data may be used to update the pipe condition data in the InfoAsset Manager Network using the most recent survey data.
Once a survey’s data has been incorporated into the network, its Current field is set to allow the user to distinguish between newly added surveys and those that have already been processed. By this approach, InfoAsset Manager provides an audit trail of all the collected survey data, alongside an up to date interpretation of the data in the network.
The user can easily identify which survey data is associated with a
pipe using the Navigate | To Related Objects (
) toolbar option from the pipe tabbed Property Sheet or Object Properties Window, which opens the relevant survey Property Sheet.
Alternatively launch the Object Browser Window to displays object relationships and manage related objects.
For further information about using CCTV Surveys, see the topics in the Using CCTV Survey Data section.
