CON_CURRITUC

NCDOT GIS Branch, based on the Flood Mapping LIDAR data. GIS web site: http://www.ncdot.org/planning/statewide/gis/ Flood Mapping web Site: http://www.ncfloodmaps.com/default_swf.asp March 11, 2005 CON_CURRITUC_20 vector digital data withheld CON_CURRITUC_20 Currituck County shapefile for 20 foot contours. Elevation for this county ranges from -18 to 56 feet. Elevation mean: 3 Feet General purpose display of elevation data. You should not expect the contours to be exact. The vertical datum used is NAVD 88, but the accuracy of the LIDAR is about 25cm or about 10, however, using two foot contours might be pushing data beyond the intended accuracy. Refer to NCDOT-GIS and Flood Mapping Web sites en March 11, 2005 publication date Complete As Needed -76.274391 -75.761171 36.559473 36.071044 2805302.499931 2951373.330147 1033706.723901 860190.000027 6684 -130 Feet Contour, LIDAR, Flood LIDAR North Carolina None. This data should not be used when extreme accuracy is critical. NC Department of Transportation GIS Help Desk (gishelp@dot.state.nc.us) Mailing Address

1587 Mail Service Center

Raleigh NC 27699-1587 USA (919)-212-6000 8AM-5PM M-F LIDAR data is maintained by the Flood Mapping Program. ESRI ArcCatalog 9.3.1.3500 Feature Class You should not expect the contours to be exact. The vertical datum used is NAVD 88, but the accuracy of the LIDAR is about 25cm or about 10, however, using two foot contours might be pushing data beyond the intended accuracy. ground condition AML process. Setting the environment variable "ARCMEMSIZE" to 268435456 might help performance, but only if you have 1GB of RAM with a large swap file. March 11, 2005 49 Minutes Arc Workstation 9; 2.4GHZ / 1 GB RAM; Program was successfully run on smaller systems and older version of Arc Contours are created from an elevation grid with the z values rounded to the nearest 1/10th of an foot. ************************************************************************************ TempElevationA = INT(RealElevation * 10 + 0.5) Resample 30 meter DEM data to fill in void areas. ************************************************************************************ TempDemResample = INT(RESAMPLE(Statewide30MeterDEM,20) + 0.5) Merge LIDAR with 30 meter DEM with LIDAR taking precedence. ************************************************************************************ TempElevationB = MERGE(TempElevationA, TempDemResample) OPTIONAL STEP: Resample grid to 10 feet instead of 20 feet. This with take the program four times longer to complete but gives a more accurate contour line by about 4 feet along the x,y. Output files will be about 20% larger. ************************************************************************************ TempElevationC = INT(RESAMPLE(TempElevationB,10,BILINEAR) + 0.5) Filter elevation to reduce the significance of anomalous mesh points. ************************************************************************************ ARC FILTER TempElevationC TempElevationD LOW Convert back to integer so each z value is at 1/10th of an foot. ************************************************************************************ TempElevationE = INT(TempElevationD + 0.5) Create Contour at every 40 feet to avoid arc limitation. Add 0.05 feet to avoid square lines that match the grid. Weed every 4 feet to reduce file size Output elevation field is set to "z-feet" Factor all contours by 0.10 to get feet instead of 1/10th of foot. ************************************************************************************ LATTICECONTOUR TempElevationE ContourLine 40 0.05 z-feet 4.0 0.10 Unsplit, Count Vertices, and remove short circluar lines ************************************************************************************ EDIT ContourLine ; SELECT( fnode# = tnode# and length < 200 and vertices < 20 ) or ( fnode# = tnode# and length < 80 ) ; DELETE Convert the "z-feet" to an integer. Repeat until all contours are created. ************************************************************************************ Merge all contours and then create 20, 10, 5 and 2 foot files. Metadata imported. withheld 20050913 17064500 Vector Simple FALSE 6719 TRUE FALSE coordinate pair 0.000256 0.000256 survey feet North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet Explicit elevation coordinate included with horizontal coordinates 1.000000 Z_FEET Z_FEET SmallInteger 2 5 0 CON_CURRITUC_20 6719 Feature Class OBJECTID OBJECTID OID 4 10 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE SHAPE Geometry 4 0 0 Feature geometry. ESRI Coordinates defining the features. Shape Feature geometry. ESRI Coordinates defining the features. 0 SHAPE.STLength() Double 0 0 Downloadable Data 4.890 4.890 20100623 NC Department of Transportation GIS Help Desk (gishelp@dot.state.nc.us) Mailing Address

1587 Mail Service Center

Raleigh NC 27699-1587 (919)-212-6000 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time en Version 6.2 (Build 9200) ; Esri ArcGIS 10.9.1.28388 -76.274391 -75.761171 36.559473 36.071044 1 CON_CURRITUC_20 2805302.499931 1033706.723901 860190.000027 2951373.330147 1 1 -76.274391 -75.761171 36.559473 36.071044 002 withheld 4.890 Feature Class Feature Class 20260306 14103300 20260306 FALSE 14103300 20180713 13463700 1.0 CON_CURRITUC_20 002 2805302.499931 2951373.330147 860190.000027 1033706.723901 1 Projected GCS_North_American_1983 Linear Unit: Foot_US (0.304801) NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.8'><WKT>PROJCS["NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",2000000.002616666],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-79.0],PARAMETER["Standard_Parallel_1",34.33333333333334],PARAMETER["Standard_Parallel_2",36.16666666666666],PARAMETER["Latitude_Of_Origin",33.75],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",2264]]</WKT><XOrigin>-121841899.99977154</XOrigin><YOrigin>-93658999.999808758</YOrigin><XYScale>15624.999985448079</XYScale><ZOrigin>0</ZOrigin><ZScale>1</ZScale><MOrigin>0</MOrigin><MScale>1</MScale><XYTolerance>0.0005120000004768373</XYTolerance><ZTolerance>2.0000000000000002e-05</ZTolerance><MTolerance>2.0000000000000002e-05</MTolerance><HighPrecision>true</HighPrecision><WKID>102719</WKID><LatestWKID>2264</LatestWKID></ProjectedCoordinateSystem> 20260306 dataset ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet EPSG 6.12(9.0.0) 2 1 20 4532 20 7406 6719