- Generalities of the data collected, information of how many lanes were scanned and starting and ending points of the scan (usually intersections);
- Gazettal chainages or any other reference points used by the customers;
- Description of the points used to align the data gathered according to the positioning system of the customer.
Analysis of the data
The analysis of the data is usually made of:
- Types of construction and points where the changes in constructions are detected. They are usually explained in one table as the one below:
|
Southbound LHL Changes in construction |
||
|
Start |
End |
Description |
|
0 |
2545 |
Three layers detected. Layer 1 average thickness of 120mm, layer 2 thickness between 250 and 300mm, and layer 3 thickness between 150 and 170mm |
|
2545 |
3500 |
Increase in thickness of layer 1 to 250mm, layers 2 and 3 as above. |
|
3500 |
3850 |
Bridge structure. |
|
3850 |
6000 |
Change to 4 layers in subsurface. Decrease of layer 1 thickness to an average of 100mm, layer 2 150mm, layer 3 120mm and layer 4 300mm |
Detection of bridges structures, overpasses, etc.
- General condition of the top surface:
- Identification and position of cracks (longitudinal, transverse, crocodile, block, etc.)
- When identifying cracks in sections with concrete slabs, calculation % of slabs cracked
- Sections of concern (those sections with high amount of cracks per square metre and those with wide open cracks)
- Identification of surface patches and trenches
- Moisture within layers
- Average thickness of subsurface layers
- Patches (usually correlated with the top surface patches)
- Detection and accurate position of subsurface features, such as pipes, manholes, water grates (depending of the width of the top surface picture taken), traffic sensors, culverts
- Reinforcing within the structures
- Areas with unusual subsurface structure (eg. subbase or fill affected by water ingress)
The most relevant features are described along with the point (chainage) where they were detected for a better and quick decision making process. The analysis is usually made per lane or per carriageway (eg southbound and northbound carriageways are analysed individually or in the case of four lanes Southbound RHL, LHL and Northbound RHL and LHL are also analysed separately). This is made according to the customer’s requests and/or if the differences in construction found between two lanes in the same direction are significant enough to do it.
Lanes are usually also compared to see the differences found between them.
A complete list of all the features detected with their location is also provided in a MS Excel spreadsheet attached to the report.
An Adobe PDF document with the images of the surface and corresponding subsurface features mark-up is produced in support of the MS Excel spreadsheets.
Download the below documents for real examples:
Demo_Report.doc 
Demo_Spread_Sheet.xls 
Printout_Demo.pdf See below for an example of a KML ouput generated during data export: