Скачать с ютуб Webinar: Getting the Most from Utility GPR Data в хорошем качестве

Webinar: Getting the Most from Utility GPR Data

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