﻿1 00:00:00,000 --> 00:00:05,840 [Chimes] 2 00:00:07,380 --> 00:00:16,180 Soybeans, wheat, sugarbeets, corn. Nebraska is one of the biggest agricultural producers in the UNited States. 3 00:00:16,180 --> 00:00:25,280 Field to field, crop to crop, every farmer uses a different amount of water. How do we keep track of such diverse water use? 4 00:00:25,280 --> 00:00:43,000 The Landsat satellites gives us the ability to see individual fields. We can see what they are growing in each field and how much water is being consumed from each field. 5 00:00:43,000 --> 00:00:51,019 So that it's a great satellite that gives us so much information about our planet 6 00:00:53,120 --> 00:01:01,540 we use what we call surface energy balance. We know the amount of energy coming in from sunlight. Some of that energy is 7 00:01:01,540 --> 00:01:08,760 released as heat and measured by Landsat's infrared sensors. At the same time 8 00:01:09,100 --> 00:01:15,440 water from transpiration cools the surface, lowering the temperature of the fields 9 00:01:15,640 --> 00:01:19,700 and limiting the amount of heat seen by the thermal sensors. 10 00:01:19,900 --> 00:01:23,800 And we solve the energy balance for all these 11 00:01:23,800 --> 00:01:29,520 components. The energy balance then yields the ET which is the water that was consumed. 12 00:01:29,660 --> 00:01:50,899 We receive a monthly data set of metric ET data so we've got for May, June, July, August, September, we are getting inches of water used on the landscape so it covers the whole entire NRD 13 00:01:52,020 --> 00:01:57,080 Let's take an aerial view of this. Landsat 14 00:01:57,080 --> 00:02:01,179 measures the health of individual plants and the temperature of the land 15 00:02:04,160 --> 00:02:13,280 as we move into summer temperatures increase. Irrigated fields look cool because water evaporates from the soil and transpires from the 16 00:02:13,280 --> 00:02:20,720 plants. You can see ET peak midway through the growing season when corn needs the most water. 17 00:02:22,280 --> 00:02:29,640 By tracking monthly ET resource managers know how much water each field has used. The Central Platte 18 00:02:29,640 --> 00:02:34,220 Natural Resources District uses these measurements to plan their water budget. 19 00:02:34,620 --> 00:02:45,580 We need to maintain a balanced groundwater aquifer system. We don't want to deplete it. We don't want to overfill it because if we overfill it it runs out 20 00:02:45,580 --> 00:02:53,260 but, yeah, that's our goal. It's to maintain the large amount of irrigation we have here in the valley. 21 00:02:53,260 --> 00:02:57,040 and being able to do that on a sustainable basis. 22 00:02:58,620 --> 00:03:08,340 Metric, the system used to develop ET, was developed in the early 2000s. Today it's being used by 15 states across the United States. 23 00:03:08,340 --> 00:03:18,160 Water is important in this region and having this data now really helps us to use that water wisely. 24 00:03:18,160 --> 00:03:21,000 And make wise decisions 25 00:03:22,500 --> 00:03:28,800 [Satellite Beeping]