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v4.27.0 Release To Main
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config/default/common/config/metadata/stories/surface_water_extent/step001.md
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Near-global surface water extent at 30 meter resolution is available in Worldview through the Observational Products for End-Users from Remote Sensing Analysis (OPERA) project. The Level-3 product maps surface water every few days. The layer has 5 classifications: Not Water, Open Water, Partial Surface Water, Snow/Ice, and Cloud. The input dataset is the Harmonized Landsat Sentinel-2 (HLS) dataset, and currently uses data from Landsat 8, Sentinel-2A and Sentinel-2B. | ||
Starting in April 2023, near-global dynamic surface water extent (DSWx) at 30 meter resolution is available in Worldview through the Observational Products for End-Users from Remote Sensing Analysis (OPERA) project. The Level-3 product maps surface water every few days. Based on Harmonized Landsat Sentinel-2 (HLS) inputs, the water (WTR) layer has 5 classes: Not Water, Open Water, Partial Surface Water, HLS Snow/Ice, and HLS Cloud/Cloud Shadow. DSWx-HLS currently includes data from NASA/USGS Landsat 8, ESA Sentinel-2A and Sentinel-2B. |
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config/default/common/config/metadata/stories/surface_water_extent/step002.md
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The Laguna de Aculeo is a two hours' drive from Santiago, Chile and was a long-time popular summer vacationing spot to go boating, swimming, and water skiing. A combination of nearby population growth, purchasing of water rights for agriculture, and drought caused the shallow lake to go dry in 2018. This true-color reflectance image from 18 May 2023 from the European Space Agency's (ESA) Sentinel-2A and -2B satellites show a dry lake bed in shades of brown in the center of the map. | ||
The Laguna de Aculeo is a two hours' drive from Santiago, Chile and was a long-time popular summer vacation spot for boating, swimming, and water skiing. A combination of nearby population growth, purchasing of water rights for agriculture, and drought caused the shallow lake to go dry in 2018. This true-color reflectance image of 18 May 2023 from HLS Landsat 8 satellite shows a dry lake bed in shades of brown in the center of the view. |
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config/default/common/config/metadata/stories/surface_water_extent/step003.md
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An intense winter storm fueled by an atmospheric river in late-August 2023 caused the lake to partially refill. The image on the left shows the dried lake bed on 18 May 2023, and the image on the right shows the partially filled lake on 15 September 2023. Swipe the bar back and forth to see the lake fill and turn greenish blue on the right "B" side of the map. | ||
An intense winter storm fueled by an atmospheric river in late-August 2023 caused the lake to partially refill. The image on the left shows the dried lake bed on 18 May 2023, and the image on the right shows the partially filled lake on 15 September 2023. Swipe the bar back and forth to see the lake fill and turn greenish blue on the right "B" side of the view. |
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config/default/common/config/metadata/stories/surface_water_extent/step004.md
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The OPERA surface water extent layer helps to highlight the refilled lake in shades of blue, indicating open water and partial surface water. The layer is designed to improve our understanding of the spatial and temporal variations of land inundation by surface water. It is currently unclear how long this lake will remain filled, but as of 19 December 2023 in the right image, the lake appears to be at a similar water level as the left image from 15 September. | ||
The OPERA water layer highlights the refilled lake in dark blue where open water dominates each satellite measurement, and light blue where the satellite measurement includes mixtures of water, soil, or vegetaion, or is particularly shallow (partial surface water). The layer is designed to improve our understanding of the spatial and temporal variations of land inundation by surface water. It is currently unclear how long this lake will remain filled, but as of 20 December 2023 in the right image, DSWx-HLS indicates the lake water level is slightly higher than at the time of the left image from 15 September. | ||
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Learn more at Earth Observatory's [Water Returns to Laguna de Acuelo](https://earthobservatory.nasa.gov/images/151836/water-returns-to-laguna-de-aculeo). |
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config/default/common/config/metadata/stories/surface_water_extent/step005.md
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The Indus River Valley receives heavy monsoon rains each summer which contribute to the appearance of extensive surface water. These false-color reflectance images from Landsat 8 show water in dark blues. The left image is from 3 May 2023, before the monsoon rains, and the right side is from 7 August 2023. Swiping the bar back and forth reveals the extent of floodwaters along the riverbanks and in the surrounding region. | ||
Each summer, the Indus River Valley receives heavy monsoon rains that contribute to the appearance of extensive surface water. These false-color reflectance HLS images from Landsat 8 show open water in black to dark blue hues. The left image is from 3 May 2023, before the monsoon rains, and the right side is from 7 August 2023. Swiping the bar back and forth suggests the extent of floodwaters along the riverbanks and in the surrounding region. |
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config/default/common/config/metadata/stories/surface_water_extent/step006.md
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The OPERA surface water extent layer shows the floodwaters very clearly in shades of dark and light blue. It highlights how much surface water there is beyond the meandering river banks and the water covering the surrounding region. | ||
The OPERA surface water extent layer shows the floodwaters very clearly in shades of dark and light blue. It highlights how much surface water is present beyond the meandering river banks, covering the surrounding region. |
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config/default/common/config/metadata/stories/surface_water_extent/step007.md
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The Kakhovka Dam, along the Dnieper River in Ukraine was breached on 6 June 2023. The left image is from 5 June 2023, and shows the filled Kakhovka Reservoir in the right portion of the map. The right image is from 5 July 2023 and shows the drained reservoir. Turn on and off the OPERA surface water extent layer to see that the reservoir is no longer full of water, but is mostly brown, exposed ground. | ||
The Kakhovka Dam, along the Dnieper River in Ukraine was breached on 6 June 2023. The left image is from 5 June 2023, and shows the filled Kakhovka Reservoir in the right portion of the view. The right image is from 5 July 2023 and shows the drained reservoir. Turn the OPERA surface water extent layer on and off using the eye icon in the layer list to see that the reservoir is no longer full of water, and is mostly exposed ground. | ||
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config/default/common/config/metadata/stories/surface_water_extent/step008.md
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Zooming in closer, it is evident that the dam was breached. Swipe the bar back and forth to compare the amount of water in the reservoir between 5 June 2023 and 4 August 2023. The right image shows light brown, exposed land of the drained reservoir. | ||
Zooming in closer, it is evident that the dam was breached. Swipe the bar back and forth to compare the amount of water in the reservoir between 5 June 2023 and 4 August 2023. The right image shows the bright exposed soil given the drained reservoir. |
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config/default/common/config/metadata/stories/surface_water_extent/step009.md
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Tulare Lake in San Joaquin Valley, California, was once the largest freshwater lake west of the Mississippi River but feeder rivers were diverted for irrigation and municipal water use. Since the 1920s, the dry lake bed has been used to grow crops like almonds and tomatoes. Drag the comparison slider to the right "B" side shows how heavy rains caused the area to flood and re-fill. | ||
Tulare Lake in San Joaquin Valley, California, was once the largest freshwater lake west of the Mississippi River before feeder rivers were diverted for irrigation and municipal water use. Since the 1920s, the dry lake bed has been used to grow crops like almonds and tomatoes. Drag the swipe bar to the left to show the DSWx-HLS water class colors emphasize how heavy rains caused the area to flood and re-fill. |
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config/default/common/config/metadata/stories/surface_water_extent/step010.md
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