[HOT] Damage Proxy Map

Chad Blevins cblevins at usaid.gov
Fri May 1 21:19:50 UTC 2015

Sharing this link with the community .  Email includes brief explanation of
the product.


Here is the link to the Damage Proxy Map (DPM) produced by the ARIA team at


Please read the message below to better understand the product and how to
interpret it.

In order to insert these 'Damage Proxy Map' (DPM) products into your damage
assessment work flow for use in tasking search & rescue teams at the
earliest possible time, please find attached the DPM product. As the
caption embedded in the KMZ file states, the data used are from the Italian
Space Agency (ASI) COSMO-SkyMed satellite. Further details are in that

These initial DPM data for the Kathmandu area have been validated &
verified with several other data sets, but only to a limited degree because
they were just generated on April 30, 2015. This DPM is intended to provide
guidance for identifying damage to structures in urban areas. In vegetated
areas and outside of the urban areas, the DPM is not intended to be useful
for any other purposes so should not be interpreted or used for other
purposes in those areas (e.g., we do not know if it can be used reliably
for landslide mapping, etc. because vegetation changes all the time).

We are finding that the DPM in many cases agrees very well with these
existing products. It also identifies 'tips' (red areas) that coincide with
damage that we can verify in the high-res EO imagery. In the places where
we have spot-checked the DPM, in many cases it appears to us to perform
very well. In other places, however, we must be clear in saying that it is
not 100% accurate. Please accept the DPM "as is" and see if it can be
useful to you.

Past experience with DPMs from earthquakes, severe storms, and urban
construction has shown good correlation between areas identified in the DPM
as having significant change and damage to buildings and other urban

The KMZ includes the NGA damage assessment product (with purple, red dots
indicating severe damage) and the DPM as a red-to-yellow scale layer. In
some cases, DPM seems to have missed damage. In other areas, DPM indicates
a 'tip' but the NGA product has no indication of damage. We also have seen
several cases in which DPM indicates damaged buildings, and we see them for
sure in the post-eq high-res EO, but they were not yet included in the NGA
damage products (as of April 30).

We hope for feedback from end users with the hope of improving future
product releases.

Sang-Ho Yun (Sang-Ho.Yun at jpl.nasa.gov) is the ARIA DPM technical contact
and should be contacted for further information.

Ernesto Diaz

*Chad Blevins*
U.S. Global Development Lab
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