Webinar: Getting the Most from Utility GPR Data
4.8 هزار بار بازدید -
4 سال پیش
-
Utility locators using GPR learn
Utility locators using GPR learn early that subsurface objects are indicated by hyperbolas, but they also learn that not all hyperbolas are utilities; they can be rocks, metal debris or other objects of no interest. In this webinar, we learn how GPR reflections from utilities occur, what affects them and several strategies, such as the use of depth slices, GPS and interpretations, to get the most out of your utility-locating GPR data.
0:00 – Introduction
1:05 – How GPR detects utilities
3:05 – Agenda
3:35 – Why do GPR waves reflect from objects like utilities?
4:30 – GPR Reflections from contrasting layers
6:10 – What controls how much GPR energy reflects from an object or boundary?
13:00 – The effects of water in the soil for detecting objects
15:49 – GPR images the contrasts in the subsurface
17:43 – GPR signal attenuation limits the depth of GPR penetration
21:05 – Stacking more increases GPR signal depth of penetration
30:05 – How to “gain” GPR data properly
32:12 – Applying a Background Subtraction filter to emphasize hyperbolas
34:12 – The advantages of GPR grid collection for locating utilities at complex sites
35:10 – GPR grid data processed into depth slices
37:10 – Using GPS to position “pseudo grid” or “random walk” GPR data
38:39 – Depth slices cannot map targets with a weak response
39:50 – Adding interpretations to weak hyperbolas
41:08 – SplitView screen – cross-section and map image simultaneously
42:18 – Locating utilities at sites with many hyperbolas
44:00 – Data collection perseverance
44:29 – Summary
45:39 - End
0:00 – Introduction
1:05 – How GPR detects utilities
3:05 – Agenda
3:35 – Why do GPR waves reflect from objects like utilities?
4:30 – GPR Reflections from contrasting layers
6:10 – What controls how much GPR energy reflects from an object or boundary?
13:00 – The effects of water in the soil for detecting objects
15:49 – GPR images the contrasts in the subsurface
17:43 – GPR signal attenuation limits the depth of GPR penetration
21:05 – Stacking more increases GPR signal depth of penetration
30:05 – How to “gain” GPR data properly
32:12 – Applying a Background Subtraction filter to emphasize hyperbolas
34:12 – The advantages of GPR grid collection for locating utilities at complex sites
35:10 – GPR grid data processed into depth slices
37:10 – Using GPS to position “pseudo grid” or “random walk” GPR data
38:39 – Depth slices cannot map targets with a weak response
39:50 – Adding interpretations to weak hyperbolas
41:08 – SplitView screen – cross-section and map image simultaneously
42:18 – Locating utilities at sites with many hyperbolas
44:00 – Data collection perseverance
44:29 – Summary
45:39 - End
4 سال پیش
در تاریخ 1399/04/26 منتشر شده
است.
4,886
بـار بازدید شده