Citation: Brakenridge, G.R., Anderson, E., Kettner, A.J., Slayback, D. and Policelli, F., date accessed, "Current Flood Conditions, Sheet #", Dartmouth Flood Observatory, University of Colorado, Boulder, CO, USA, http://floodobservatory.colorado.edu/.
To create this display, satellite data are obtained by the Flood Observatory, processed to detect water/land boundaries, and analyzed to produce current surface water extent in vector GIS format. These displays are updated daily. The Observatory also accepts GIS flood inundation limits from other sources and incorporates this information with permission of the authors. The date of last update is shown on each map.
The map sheet number gives geographic coordinates of the upper left corner of map. Most maps measure 10 degrees in both longitude and latitude and are in plate-carree (equirectangular) projection. Sheets above 60 degrees north are in UTM projections and measure 20 degrees in longitude. A large scale Geotif version is also available.
Color coding: 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, pre-2000. The Shuttle Water Boundary Data (SWBD, February, 2002) are at 90 m spatial resolution and provide a useful reference water between latitudes 60 degrees south and 56 degrees north. Where used, it is the uppermost map layer (this color). Otherwise, the map layers are arranged sequentially by year, with oldest at bottom.
Red is current surface water (flooding) where it is extending beyond the SWBD information. Twice-daily imaging (Terra-MODIS and Aqua-MODIS, at 250 m spatial resolution) of surface water is accumulated over 14 days to remove nearly all cloud obscuration. The map date refers to a two week period ending on that date.
Floods in mountainous regions are exceptionally hazardous, but they are difficult remote sensing targets and not always observable. Additionally, cloud cover or other constraints sometimes restrict the ability to capture peak inundation everywhere. The displays do not illustrate all areas of possible current flooding.
See Also the Global Atlas of Floodplains
At selected locations, a time series of satellite microwave-based daily river discharge measurements are available from the Flood Observatory. See River Watch Global Display for more information. A sample from Site 809 in this map sheet is shown below. In the online version of this map sheet, the river reaches monitored by each site are clickable and provide data access. White triangles: ice covered. Yellow dots: low flow (<5th percentile mean daily runoff for this date, 1998-2012); Blue dots: normal flow; Purple dots: moderate flooding (>1.5 yr recurrence); Red dots, major flooding (> 5 yr recurrence).
The Land Atmosphere Near-real time Capability for EOS (LANCE) system, operated by NASA/GSFC, provides daily MODIS data at 250 m spatial resolution. Landsat 8 data, if used, are provided by the U.S. Geological Survey Hazards Data Distribution System. Landsat 8 is jointly managed by NASA and the United States Geological Survey. COSMO-SkyMed synthetic aperture radar (SAR) data are occasionally provided by the Italian Space Agency (ASI) as contribution to the CEOS Flood Pilot. Sentinel 1 SAR data, when used, are provided by the European Space Agency. NASA EO-1satellite tasking and data are provided by Stuart Frye and colleagues at the NASA Goddard Space Flight Center. MODIS data beginning in year 2012 are based on an automated product provided by NASA Goddard Space Flight Center. The non-automated, MODIS-based .shp or MapInfo files before year 2012 are located in a special map sheet folder here together with any other high resolution (Landsat 8, EO-1, etc) .shp or MapInfo files (including all third party data available for redistribution). Click here for access to the automated daily .shp file GIS record (record commences in 2011). Choose map sheet directory and appropriate dates.
As part of collaborations with other disaster response/satelllite mapping organizations, and the Global Flood Partnership, our maps and other data are provided through the above links. With appropriate citation, they can be used freely, including for commercial purposes, under the terms of the Creative Commons Attribution 3.0 Unported License.
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