Attachment A by liamei12345


									        Initial Technical Guidance for Inundation Initiative Pilot Project Static Library Products
                                             April 27, 2010

Pilot projects selected for the USGS Inundation Initiative will follow guidelines and recommendations
provided in “Flood Inundation Map Library Guidelines (Draft)”, Draft version June 2, 2008, developed by
the NOAA NWS Coastal Service Center and the USGS (Attachment A). These guidelines are designed to
provide a “minimum standard” so that specified pilot project products are uniform – while at the same
time, providing individual offices latitude in library creation and in displaying enhancements that they
may desire.

A note on flood map interval: Section 3.1 of Attachment A states that “the map interval and grid density
should not provide higher resolution than the underlying topographic data supports. “ Specifically, it is
recommended that the mapping interval not be less than one-half of the DEM equivalent contour
interval (for example, for a 2 ft equivalent contour interval, the mapping interval should be 1 ft).

Section 6 of Attachment A gives general guidance for file and metadata formats. The following is more
specific guidance for flood inundation map library flood surface file formats, metadata, and standards
for file display. By following this guidance, all new map libraries will have a uniform “look and feel” to
users of the information. Making the map libraries available to experts through downloadable GIS file
formats as well as to lay persons through Google Earth and the widely available Portable Document
Format (PDF) will ensure that the broadest possible audience will access the libraries, increasing the
relevance of the role of the USGS in this critical Hazards area. Map libraries will be served through a
USGS Internet flood inundation portal in the following formats:
     1. Downloadable ESRI polygon and line shapefiles, ESRI grid raster files, and ESRI XML metadata
          files: these formats will allow experienced GIS application users to use the files for purposes
          such as flood preparedness and response, flood loss estimates (e.g. HAZUS-MH) and flood
          mitigation projects. This format will allow maps to be posted on National Weather Service
          (NWS) Advanced Hydrologic Predictive Service inundation sites when desired by a Water Science
          Center Cooperator. The metadata will be Federal Geographical Data Committee (FGDC)
          compliant. ESRI polygon and line shapefiles, grid raster files, and XML metadata files will be
          developed per the attached deliverables checklist (Attachment B)
     2. KML/KMZ format: Keyhole Markup Language (KML) and KML-Zipped (KMZ) files are used by
          applications, most commonly Google Earth, to display geospatial data. This format allows for
          Google Earth applications such as animations and fly-throughs. The KML/KMZ files will be
          created from the available GIS layers in item 1 above (Attachment C).
     3. PDF files: will allow viewing and printing of maps by a broad audience. The PDF files will be
          created from the available GIS layers in item 1 above. PDF files will conform to a template,
          similar to the attached format (Attachment D), to insure consistent symbology, disclaimers,
          colors, patterns, and features. This template must be vetted through the Report Specialists and
          will be delivered to pilot project chiefs upon approval.

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