Posted – 2017/09/05
In the side by side sliding image shown below, we provide a comparison between a flood map created by the Copernicus EMS on 8/28/2017 and one created by Ursa using Sentinel imagery on 8/30/2017 of the same location.
Slide the center vertical bar back and forth to compare images:
Using updated imagery from Airbus on 9/2/17, Ursa created flood maps for the Houston area. See radar image with flood overlay (below right) and topographical map with flood overlay (below left).
Posted – 2017/09/01
In the image below, we provide an e-GEOS floodmap overlaid on a basemap of the Sugarland/Angleton, TX area.
Using updated imagery from Airbus, Ursa created flood maps for the Beaumont/Nederland and Texas City areas. See radar image with flood overlay (below right) and topographical map with flood overlay (below left).
Posted – 2017/08/31
Using Sentinel imagery from 8/29/17, Ursa was able to recreate a similar flood mapping to imagery from Airbus taken at the same time (~8:00pm on 8/29/17).
Posted – 2017/08/30
Through Ursa’s agreement with Airbus Defense and Space, Airbus is also monitoring Hurricane Harvey and providing images from TerraSAR-X, its radar satellite. The image (above left) from 8/29 shows an updated image from last night looking at Houston, Texas. You can see major flooding in downtown and nearby areas. The image (above right), demonstrates the original radar image from 8/29 with flooding shown on top.
Posted – 2017/08/29
In the new image from 8/28/17 (below right), you can see that there is little change from the previous day (below left).
This flood map, from 8/28/17 visualizes different levels of flooding. Dark blue is additional flooding on top of previous measurements and already existent water from 8/26/17.
Posted – 2017/08/28
In the following image from 8/27/17 (below left), the day after the storm moved through, you can see that the water is not so rough.
In the radar image from 8/27/17 (above left), we have enhanced the contrast in the baseline water levels (darker blue) and the new water levels that resulted from Hurricane Harvey. Flooded regions are shown in light blue.
In the image from 8/27/17 (above right), you can see the flooded regions overlaid on top of an optical satellite ArcGIS base map.
The image above shows a close up of the heavily flooded regions overlaid on top of an optical satellite ArcGIS base map.
Posted – 2017/08/27
With images furnished by e-GEOS (an ASI/Telespazio Company), Ursa is monitoring areas affected by Hurricane Harvey. Due to the heavy cloud cover from the hurricane, optical satellites are unable to penetrate the areas to capture information about ground conditions. It is also difficult for airborne sensors to obtain information, due to the high wind conditions. Ursa analyzes satellite-based radar, which can get information through cloud cover or at night, to get insight into the extent of flooding.
Through Ursa’s agreement with e-GEOS, e-GEOS is monitoring Hurricane Harvey and providing images from the Italian constellation, COSMO-SkyMed, of radar satellites. Ursa is using the imagery to provide information about flooding that will be updated frequently on this page.
Ursa obtained an image from e-GEOS on 8/26/2017 at 1210 UTC (7am local time) of Corpus Christi, and is monitoring other locations.
Below is a footprint of the area that was captured the morning of 8/26/17, as the storm was underway:
Radar Images of Corpus Christi, TX
The following images are side-by-side comparisons of radar images.
In the satellite radar image, above right (from 8-26-17), you can see the rough water as the powerful storm was underway.
For the near term, there is predicted flooding along the Texas Gulf Coast. With support from our partners at e-GEOS and Airbus, Ursa will continue to analyze the satellite imagery and update our website.
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© DLR e.V. 2017, Distribution Airbus Defence and Space GmbH
TerraSAR-X value-added products (e.g. change detection, SMM, etc),
WorldDEM DSM & DTM et al:
© DLR e.V. 2017 and © Airbus Defence and Space GmbH 2017
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