<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE metadata SYSTEM "http://www.fgdc.gov/metadata/fgdc-std-001-1998.dtd"><metadata>
<idinfo>
<citation>
<citeinfo>
<origin>Watershed Sciences</origin>
<pubdate>201011</pubdate>
<title>Flathead Basin 2009 2-Foot Contours, Generalized</title>
<geoform>vector digital data</geoform>
<pubinfo>
<pubplace>Helena, MT</pubplace>
<publish>Montana State Library</publish>
</pubinfo>
<onlink>http://nris.mt.gov/flathead/contour.asp</onlink>
</citeinfo>
</citation>
<descript>
<abstract>2-foot topographic contours of the Flathead Basin, including the Flathead Valley north of Flathead Lake and the immediate areas around Whitefish Lake, Flathead Lake, Swan Lake, and Polson.  These contours were derived by automated methods from LiDAR point cloud data collected between September 22 and September 29, 2009.

The contour data provided by Watershed Sciences contained a very large number of vertices, with many line segements whose ground length were less than an inch.  This data was generalized at the State Library to reduce the overall file size by over 75 percent, while still retaining line fidelity such that no vertex in the original data is more that 1.5 inches, on the ground, from its representation in this data set.
</abstract>
<purpose>Elevation data to be used for floodplain delineation and other landscape analyses.</purpose>
</descript>
<timeperd>
<timeinfo>
<rngdates>
<begdate>20090922</begdate>
<enddate>20090929</enddate>
</rngdates>
</timeinfo>
<current>ground condition</current>
</timeperd>
<status>
<progress>Complete</progress>
<update>None planned</update>
</status>
<spdom>
<bounding>
<westbc>
-114.5</westbc>
<eastbc>
-113.75</eastbc>
<northbc>
48.5</northbc>
<southbc>
47.65</southbc>
</bounding>
</spdom>
<keywords>
<theme>
<themekt>ISO 19115 Topic Category</themekt>
<themekey>elevation</themekey>
</theme>
<theme>
<themekey>elevation</themekey>
<themekey>topographic</themekey>
<themekey>topography</themekey>
<themekey>contour</themekey>
</theme>
<place>
<placekey>Lake County</placekey>
<placekey>Flathead County</placekey>
<placekey>Flathead Lake</placekey>
<placekey>Montana</placekey>
<placekey>Whitefish</placekey>
<placekey>Polson</placekey>
<placekey>Kalispell</placekey>
<placekey>Swan Lake</placekey>
</place>
</keywords>
<accconst>none.</accconst>
<useconst>none.</useconst>
<ptcontac>
<cntinfo>
<cntperp>
<cntper>Stephen Story</cntper>
<cntorg>Montana DNRC Water Resources Division</cntorg>
</cntperp>
<cntaddr>
<addrtype>mailing and physical address</addrtype>
<address>1424 9th Avenue</address>
<city>Helena</city>
<state>Montana</state>
<postal>59620-1601</postal>
<country>USA</country>
</cntaddr>
<cntvoice>406-444-6664</cntvoice>
<cntemail>sestory@mt.gov</cntemail>
</cntinfo>
</ptcontac>
</idinfo>
<dataqual>
<posacc>
<horizpa>
<qhorizpa>
</qhorizpa>
</horizpa>
<vertacc>
<vertaccr>The vertical accuracy of the LiDAR data is described as the mean and standard deviation (sigma ~  ) of divergence of LiDAR point coordinates from 4229 ground survey point coordinates.  The root mean square error (RMSE) for vertical accuracy of these control points is provided.</vertaccr>
<qvertpa>
<vertaccv>3 centimeters</vertaccv>
</qvertpa>
</vertacc>
</posacc>
<lineage>
<srcinfo>
<srctime>
<timeinfo>
<rngdates>
<begdate>20090922</begdate>
<enddate>20090929</enddate>
</rngdates>
</timeinfo>
</srctime>
</srcinfo>
<procstep>
<procdesc>The LiDAR survey used a Leica ALS50 Phase II laser system.  For the Flathead Basin survey site, the sensor scan angle was ±15o from nadir with a pulse rate designed to yield an average native density (number of pulses emitted by the laser system) of 4 points per square meter over terrestrial surfaces.

A terrain model was produced for the study area.  The digital elevation modelswas created from a triangulated irregular network (TIN) of ground classified LiDAR points, however the elevation model has hydrographic feature breaklines enforced. 

3Di West (GeoTerra Mapping Group) collected breaklines for the Flathead basin study area using photogrammetric techniques.  The photogrammetric breaklines were used to supplement the LiDAR data in creation of a hydrologically enforced ground model.  Hard breaklines were draped to the elevation of the LiDAR derived ground model to co-register the elevation of the photogrammetric breakline with the LiDAR ground class.  The stream breaklines were implemented as soft breaklines, and used to detect culverts.  Points previously classified as ground above culverts in the LiDAR data were re-classed as non-ground, enabling stream channels to continue flow.  Other breaklines, such as top of bank, were used to aid ground classification, and in areas where the LiDAR did not collect a ground point, ground points were added along the breakline.

The LiDAR DEM was hydrologically enhanced using the photogrammetrically derived breaklines. The breaklines were implemented in the LiDAR data model differently depending on the feature represented. The implementation for each feature is designed to provide the most accurate and hydrologically correct ground model.

Contour key points were classed out of the ground model every 10 feet to provide more manageable dataset to work with (provided no significant change in Z). Contours were produced through TerraModeler with a Z tolerance of .33 feet. The same breakline rules and resulting ground class for the hydrologically enforced ground model were used as the basis for contour creation.  Contour lines (2 ft.) were derived from ground-classified LiDAR point data using Terrasolid LiDAR processing tools in Microstation v.8.01.</procdesc>
</procstep>
<procstep>
 <procdesc>
  Use the "Simplify Line" command from ESRI ArcToolbox to generalize the data with a tolerance of 1.5 inches.
 </procdesc>
</procstep>
</lineage>
</dataqual>
<spdoinfo>
<direct>Vector</direct>
<ptvctinf>
<sdtsterm>
<sdtstype>String</sdtstype>
<ptvctcnt>2387627</ptvctcnt>
</sdtsterm>
</ptvctinf>
</spdoinfo>
<spref>
<horizsys>
<planar>
<mapproj>
<mapprojn>Lambert Conformal Conic</mapprojn>
<lambertc>
<stdparll>45.000000</stdparll>
<stdparll>49.000000</stdparll>
<longcm>-109.500000</longcm>
<latprjo>44.250000</latprjo>
<feast>1968500.000000</feast>
<fnorth>0.000000</fnorth>
</lambertc>
</mapproj>
<planci>
<plance>coordinate pair</plance>
<coordrep>
<absres>0.000328</absres>
<ordres>0.000328</ordres>
</coordrep>
<plandu>US survey feet</plandu>
</planci>
</planar>
<geodetic>
<horizdn>D_North_American_1983_HARN</horizdn>
<ellips>Geodetic Reference System 80</ellips>
<semiaxis>6378137.000000</semiaxis>
<denflat>298.257222</denflat>
</geodetic>
</horizsys>
<vertdef>
<altsys>
<altdatum>NAVD 88 Geoid03</altdatum>
<altres>0.000100</altres>
<altunits>Feet</altunits>
<altenc>Explicit elevation coordinate included with horizontal coordinates</altenc>
</altsys>
</vertdef>
</spref>
<eainfo>
<detailed>
<enttyp>
<enttypl>
Contour</enttypl>
</enttyp>
<attr>
<attrlabl>OBJECTID</attrlabl>
<attrdef>Internal feature number.</attrdef>
</attr>
<attr>
<attrlabl>Shape</attrlabl>
<attrdef>Feature geometry.</attrdef>
</attr>
<attr>
<attrlabl>elevation</attrlabl>
<attrdef>Elevation of line in feet</attrdef>
</attr>
<attr>
<attrlabl>Shape_Length</attrlabl>
<attrdef>Length of feature in feet</attrdef>
</attr>
</detailed>
</eainfo>
<distinfo>
<distrib>
<cntinfo>
<cntorgp>
<cntorg>Montana State Library</cntorg>
</cntorgp>
<cntaddr>
<addrtype>mailing address</addrtype>
<address>PO Box 201800</address>
<city>Helena</city>
<state>MT</state>
<postal>59620-1800</postal>
</cntaddr>
<cntvoice>406-444-5355</cntvoice>
<cntemail>nris@mt.gov</cntemail>
</cntinfo>
</distrib>
<resdesc>Downloadable Data</resdesc>
<stdorder>
<digform>
<digtinfo>
<formname>ESRI shapefile</formname>
</digtinfo>
<digtopt>
<onlinopt>
<computer>
<networka>
<networkr>http://nris.mt.gov/flathead/contour.asp</networkr>
</networka>
</computer>
</onlinopt>
</digtopt>
</digform>
</stdorder>
</distinfo>
<metainfo>
<metd>201005</metd>
<metc>
<cntinfo>
<cntorgp>
<cntorg>Montana State Library</cntorg>
<cntper>Gerry Daumiller</cntper>
</cntorgp>
<cntaddr>
<addrtype>mailing address</addrtype>
<address>PO Box 201800</address>
<city>Helena</city>
<state>Montana</state>
<postal>59620-1800</postal>
</cntaddr>
<cntvoice>406-444-5358</cntvoice>
</cntinfo>
</metc>
<metstdn>FGDC Content Standards for Digital Geospatial Metadata</metstdn>
<metstdv>FGDC-STD-001-1998</metstdv>
<mettc>local time</mettc>
</metainfo>
</metadata>
