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Member:sungbeanJo_GG [2020/11/24 20:18] sungbean |
Member:sungbeanJo_GG [2020/11/24 20:25] (current) sungbean |
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| - | Ground elevation data can be collected using several | + | The trial has successfully demonstrated ROSEN’s |
| - | methods. Accurate data for small areas can be collected using differential global positioning system (DGPS) | + | methodology to estimate the depth of cover over |
| - | survey equipment. To capture ground elevation data on a | + | pipelines. This includes producing an accurate |
| - | larger scale, a LiDAR sensor can be attached to aircraft. | + | pipeline centreline from data obtained during a |
| - | LiDAR is a | + | routine internal inspection, combined with ground |
| - | remote sensing | + | elevation data available from the Environment |
| - | method which | + | Agency (EA) to calculate depth of cover. |
| - | uses laser light | + | • The results of the calculation have been validated |
| - | to measure | + | against infield depth of cover measurements obtained using a pipe and cable locator. The accuracy |
| - | distance to | + | of the depth of cover results has been calculated |
| - | a target and | + | using a root mean square (RMS) error method. This |
| - | is commonly | + | has determined an overall accuracy of ±0.15 m using EA LiDAR data. |
| - | used to map | + | • Infield ground surface measurements were compared with the EA LiDAR and OS Terrain data. A |
| - | terrain and surface objects. | + | |
| - | The advantage | + | |
| - | of this method | + | |
| - | is that a large | + | |
| - | amount of | + | |
| - | highly accurate | + | |
| - | data can be | + | |
| - | collected allowing large areas | + | |
| - | to be surveyed | + | |
| - | efficiently. | + | |
