NFIE Continental Flood Inundation Mapping - Data Repository

Data

Currently, we provide 10m Height Above Nearest Drainage (HAND) raster data for the 331 HUC6 units in conterminous U.S. (CONUS), excluding the five units of the great lakes.

HAND HUC6 Coverage:

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Software

HAND output metadata

Assume ${HUCID} denotes the HUC6 code for each unit. This is the list of files in each HUC6 HAND directory:
${HUCID}-wbd.shp	HUC unit boundary shape file, extracted from USGS WBD
${HUCID}-wbdbuf.shp	HUC unit boundary shape file, extracted from USGS WBD (buffered)
${HUCID}-flows.shp	Flowline shape file, extracted from NHDPlus V21
${HUCID}-inlets0.shp	Inlets point shape file in the HUC unit. Native projection
${HUCID}-inlets.shp	Inlets point shape file in the HUC unit. EPSG:4269
${HUCID}-weights.tif	Weight grid of the rasterized inlet points
${HUCID}.tif		Clipped HUC unit DEM from USGS 3DEP 10m elevation dataset (buffered)
${HUCID}fel.tif		Pit-removed DEM; output of TauDEM pitremove
${HUCID}p.tif		D8 flow direction raster; output of TauDEM d8flowdir
${HUCID}sd8.tif		D8 slope raster; output of TauDEM d8flowdir
${HUCID}ang.tif		Dinfinity flow direction raster; output of TauDEM dinfflowdir
${HUCID}slp.tif		Dinfinity slope raster; output of TauDEM dinfflowdir
${HUCID}ssa.tif		Contributing area raster; output of TauDEM aread8
${HUCID}src.tif		Stream grid; output of TauDEM threshold (threshold=1)
${HUCID}dd.tif		Bufferred HAND raster; output of TauDEM dinfdistdown
${HUCID}hand.tif	HAND raster, buffer removed, final result

Visualization (to be updated)

HAND is published as OSGeo Tile Map Service (TMS, https://wiki.osgeo.org/wiki/Tile_Map_Service_Specification) and can be rendered at a client as an XYZ layer. Note that TMS and XYZ standards differ in only one thing: Y tile coordinate. The conversion is simple: y' = 2^z - y - 1 (or in C, y = 1 << z - y - 1), where z is the zoom level (2^z is the total number of tiles at this zoom level).

If you want the CONUS view, configure the map layer as below:

{
	"type": "XYZ",
	"extent": [-14392000, 2436200, -7279500, 6594375],
	"url": "https://web.corral.tacc.utexas.edu/nfiedata/TMS/CONUS-mercator/{z}/{x}/{-y}.png",
	"projection": "EPSG:3857",
	"minZoom": 5,
	"maxZoom": 10
}

If you want to download HAND of a HUC6 unit, use the url pattern as below (replace {huc6code} with the actual code):

https://web.corral.tacc.utexas.edu/nfiedata/HAND/{huc6code}/{huc6code}hand.tif

If you want to visualize a particular HUC6 HAND, use the url pattern as below (replace {huc6code} with the actual code):

https://web.corral.tacc.utexas.edu/nfiedata/TMS/HUC6-mercator/{huc6code}/openlayers.html

If you need to obtain TMS definition of a HUC6 HAND, use the url pattern as below (replace {huc6code} with the actual code):

https://web.corral.tacc.utexas.edu/nfiedata/TMS/HUC6-mercator/{huc6code}/tilemapresource.xml

LICENSE FOR USE -- MAPS AND DATA DISCLAIMER

This resource is shared under the Creative Commons Attribution CC BY, http://creativecommons.org/licenses/by/4.0/

MAPS AND DATA DISCLAIMER

The University of Texas (UT) shall not be held liable for improper or incorrect use of the data described or information contained on this map or associated series of maps. The data and related map graphics are not legal, land survey or engineering documents and are not intended to be used as such.

UT gives no warranty, express or implied, as to the accuracy, reliability, utility or completeness of this information. The user of these maps and data assumes all responsibility and risk for the use of the maps and data. UT disclaims all warranties, representations or endorsements either express or implied, with regard to the information contained in this map product, including, but not limited to, all implied warranties of merchantability, fitness for a particular purpose or non-infringement.

This preliminary map product is for research and review purposes only. It is not intended to be used for emergency management operational or life safety decisions at the local or regional governmental level or by the general public. Users requiring information regarding hazardous conditions or meteorological conditions for specific geographic areas should consult directly with their city or county emergency management office.

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