Atlas of Global Flood Hazard: E50N30
by the NASA Office of Earth Sciences and by Dartmouth College
- The atlas is composed
of shaded relief maps in UTM projection. Surface water detected
by NASA's MODIS sensor provides a standard hydrography for comparison
purposes. Most maps extend ten degrees in latitude and longitude.
They illustrate actual floods imaged by a variety of orbital
spacecraft in recent years. Inundation limits for each year are
combined and shown as one map color.
- Satellite data were
obtained by DFO staff, processed to detect water/land boundaries,
geocoded to standard UTM map projections, and analyzed to produce
inundation limits in vector GIS format. Original GIS vector data
(inundation limits only) are also available and can be used to
study in more detail inundation during each year, or that resulting
from a particular flood. Contact Brakenridge@dartmouth.edu.
- The maps are being
continually updated from archival satellite data and as new floods
occur. A global atlas of flood hazard is thereby emerging and
will become increasingly comprehensive. Caution to all users:
Floods in mountainous regions are high energy but difficult remote
sensing targets. Also, cloud cover or other constraints sometimes
restrict our ability to capture peak inundation. The maps in
this atlas are incomplete and do not illustrate all areas of
- Map Preparation and
Image analysis: G.R. Brakenridge and Elaine Anderson
- Small (1 meg) E50N30s.jpg
- Large (3 meg) E50N30.jpg
Gaging Reaches for This Map:
The reaches are used
to measure flood magnitudes and compare predicted discharges.
At these locations, a time series of measured water surface areas
and mean flow widths have been obtained. These data are analyzed
in order to constrain the size of the associated flood discharges.
Reaches listed below are illustrated on this map. Click on the
reach number to access the gaging reaches.
(clickable reach list to be added)