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ARIA Damage Proxy Map (DPM) Created by: ARIA Team at JPL Point(s) of Contact: Sang-Ho Yun, NASA JPL Region: Kathmandu Area Date: 2014-11-24 to 2015-04-25 Generated: 2015-04-30 |
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Description: This damage assessment is intended for use in tasking search and rescue teams. Damage Proxy Map (DPM) covering an area of 40-by-50 km, including Kathmandu, Nepal. Red pixels represent areas of potential damage due to the M7.8 April 25, 2015 Nepal Earthquake, as well as ground surface change during the time period Nov 24, 2014 -- Apr 29, 2015. The color variation from yellow to red indicates increasingly more significant ground surface change. DPM was created by ARIA team at JPL/Caltech, derived from COSMO-SkyMed radar data made freely available by Italian Space Agency (ASI) in support of the response effort. Preliminary validation was done by comparing to damage assessment from optical satellite imagery by NGA (Apr 30 preliminary damage assessment product) and UNITAR/UNOSAT in collaboration with USGS and UNIBAS. This DPM should be used as guidance to identify damaged areas, and may be less reliable over vegetated areas. 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 structures. 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). Data Source(s):Italian Space Agency (ASI) COSMO-SkyMed satellite Links: KMZ, NASA Image Feature Quick Web View: Quick web view Web Mapping Service (WMS) Information: http://gis1.servirglobal.net/arcgis/services/Himalaya/ARIA_DPM_COSMOSkyMed/MapServer/WMSServer?request=GetCapabilities&service=WMS Web Mapping Service (WMS) Layer Name: ARIA_DPM_CSKd_Radar_Footprint ARIA DPM v0.5u CosmoSkyMed More Information: For more information about ARIA, visit: http://aria.jpl.nasa.gov |
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