﻿1 00:00:06,633 --> 00:00:08,700 The ICESat-2 science team had 2 00:00:08,700 --> 00:00:12,600 a group meeting, of course, virtually in this weird era that we're in. 3 00:00:13,033 --> 00:00:15,900 And to make the meeting a little bit more interesting, our science team 4 00:00:15,900 --> 00:00:20,300 lead Lori Magruder, she sort of challenged all the participants to find 5 00:00:20,666 --> 00:00:24,233 what's most interesting thing that you've seen inside ICESat-2 data. 6 00:00:24,533 --> 00:00:28,300 But I happened to find an example of where ICESat-2 7 00:00:28,300 --> 00:00:31,200 flew over a hangar in Germany. 8 00:00:31,200 --> 00:00:32,300 It's a very large building. 9 00:00:32,300 --> 00:00:36,400 It's one of the largest buildings in the world, by volume and by footprint area. 10 00:00:36,400 --> 00:00:40,266 And that old hangar has been turned into an indoor waterpark. 11 00:00:40,266 --> 00:00:45,900 One side of the building is sort of polymer mylar type material. 12 00:00:45,900 --> 00:00:50,200 And the other side, that polymer or mylar type material is clear. 13 00:00:50,200 --> 00:00:54,800 And when ICESat-2 came over the top of the hangar, 14 00:00:54,800 --> 00:00:59,433 it actually sent a signal through the clear polymer into the water 15 00:00:59,433 --> 00:01:05,033 park, it hit the surface of swimming pool and returned a signal for that. 16 00:01:05,033 --> 00:01:08,400 But then it also measured the bottom of the pool and returned a signal for that. 17 00:01:08,433 --> 00:01:13,600 So in one pass, we have the surface of the hangar, the surface of the water 18 00:01:13,600 --> 00:01:17,166 and the surface in the bottom of the pool. So effectively, 19 00:01:17,166 --> 00:01:22,166 ICESat-2 is sampling bathymetry inside a building. 20 00:01:22,566 --> 00:01:27,566 Bathymetry is basically how we refer to water column depth. 21 00:01:27,566 --> 00:01:30,800 So that measurement, you know, you're bathymetric number is 20 meters. 22 00:01:30,800 --> 00:01:34,733 That means from the surface of the water column down to the bedrock below 23 00:01:34,733 --> 00:01:38,400 or the land below, there's a 20 meter differential. 24 00:01:38,400 --> 00:01:41,666 Scientists are now working to develop those data products 25 00:01:41,666 --> 00:01:45,466 and start to map some of our shallower water features. 26 00:01:45,466 --> 00:01:50,233 One of the luckier parts of this is that we actually hit that hangar at night. 27 00:01:50,233 --> 00:01:54,066 So a lot of the ambient background photons that you would receive in the 28 00:01:54,066 --> 00:01:58,200 in the detectors, all of that is minimized because it's nighttime. 29 00:01:58,200 --> 00:02:01,766 And that allowed us to be able to see possibly that indoor greenery, 30 00:02:01,766 --> 00:02:06,833 definitely the two layers associated with the pool surface and the pool bottom. 31 00:02:06,833 --> 00:02:12,033 And seeing all that and tossing that out in science team this, this 32 00:02:12,033 --> 00:02:14,033 just blew away the competition.