20251121 16055800 1.0 FALSE ELV_Lidar_DEM_2023_WM file://\\DVT2CFIRSTMAP\F$\historic\Lidar_DEM.gdb Local Area Network -8440932.583800 -8353286.083800 4642274.443300 4844592.443300 1 Projected GCS_WGS_1984 Linear Unit: Meter (1.000000) WGS_1984_Web_Mercator_Auxiliary_Sphere <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/3.3.0'><WKT>PROJCS[&quot;WGS_1984_Web_Mercator_Auxiliary_Sphere&quot;,GEOGCS[&quot;GCS_WGS_1984&quot;,DATUM[&quot;D_WGS_1984&quot;,SPHEROID[&quot;WGS_1984&quot;,6378137.0,298.257223563]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Mercator_Auxiliary_Sphere&quot;],PARAMETER[&quot;False_Easting&quot;,0.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,0.0],PARAMETER[&quot;Standard_Parallel_1&quot;,0.0],PARAMETER[&quot;Auxiliary_Sphere_Type&quot;,0.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;EPSG&quot;,3857]],VERTCS[&quot;NAVD_1988&quot;,VDATUM[&quot;North_American_Vertical_Datum_1988&quot;],PARAMETER[&quot;Vertical_Shift&quot;,0.0],PARAMETER[&quot;Direction&quot;,1.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;EPSG&quot;,5703]]</WKT><XOrigin>-20037700</XOrigin><YOrigin>-30241100</YOrigin><XYScale>148923141.92838538</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102100</WKID><LatestWKID>3857</LatestWKID><VCSWKID>5703</VCSWKID><LatestVCSWKID>5703</LatestVCSWKID></ProjectedCoordinateSystem> 32 FALSE None 1 AMD TRUE continuous floating point 4100 15000 1000 20 2048 20 75 0.01 10 600 300 Basic 1 NorthWest,Center,LockRaster,ByAttribute,Nadir,Viewpoint,Seamline,None None,JPEG,LZ77,LERC None None,Basic,Base-Top Height,Top-Top Shadow Height,Base-Top Shadow Height,3D -1 -1 0.8 1 NorthWest,Center,LockRaster,ByAttribute,Nadir,Viewpoint,Seamline,None None,JPEG,LZ77,LERC None,Basic,Full NONE <_docversion_ Sync="TRUE">10 Name,MinPS,MaxPS,LowPS,HighPS,Tag,GroupName,ProductName,CenterX,CenterY,ZOrder,Shape_Length,Shape_Area 12150 0.5 1 150000000 5000 20251121 16065500 20251121 16071600 FGDC SAM (410)822-1441 28464 Marlboro Ave, Suite 300 Easton MD 21601 US 20251121 ArcGIS Metadata 1.0 DE_Lidar_DEM_2023 2025-07-20 raster SAM (410)822-1441 28464 Marlboro Ave, Suite 300 Easton MD 21601 US SAM external d13e65f100fbb5246f4e46aa74e384c0752f5806 FirstMap Delaware Department of Technology and Information (DTI) 801 Silver Lake Blvd. Dover DE 19904 FirstMap@delaware.gov US 302-739-9500 True FirstMap <div style='text-align:Left;'><div><div><p><span>Product: These lidar data are processed Quality Level 1 (QL1) Bare-Earth DEM files, formatted to 2238 individual 1700 m x 1700 m tiles at 0.5 meter resolution. Geographic Extent: The state of Delaware. Dataset Description: The Delaware 2023 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.35 meters for QL1 data. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification 2023, revision A. The data was developed based on a horizontal projection/datum of NAD83 (2011), State Plane Delaware FIPS 0700, meters and vertical datum of NAVD88 (GEOID18), meters. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to 2238 individual 1700 m x 1700 m tiles and as tiled bare earth DEMs; all tiled to the 1700 m x 1700 m schema. Ground Conditions: Lidar was collected in the spring 2023, while no snow was on the ground and waterways were at low tide. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, a total of 197 checkpoints were used to calibrate the lidar to known ground locations established throughout the project area. A total of 110 Non-Vegetated Vertical Accuracy (NVA) points were used. A total of 87 Vegetated Vertical Accuracy (VVA) points were used. These checkpoints were not used to calibrate or post process the data.</span></p></div></div></div> To acquire detailed surface elevation data for use in conservation planning, design, research, floodplain mapping, dam safety assessments and elevation modeling, etc. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEM. The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 0.5 meter cell size for QL1 data. Delaware Maryland Model Bare-Earth DEM Remote Sensing Elevation Data Lidar QL1 Model Bare-Earth DEM Remote Sensing Elevation Data Lidar QL1 Delaware Maryland <div style='text-align:Left;'><div><div><p><span>Users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.</span></p><p><span>The State of Delaware makes no warranty or representation, expressed or implied, with respect to the quality, content, accuracy, completeness, currency, or non-infringement of proprietary rights, of any of the GIS or other data or information, or any other materials and items, that are displayed or made available for download from this site. All such data, information, items and materials (collectively, the “FirstMap Data”) are provided "as is" and users are fully and solely responsible for any consequences of use. FirstMap Data may have been created from a variety of sources, including sources beyond the control of the State of Delaware, and are subject to change without notice. To the extent you use, apply, add to, modify or implement this information in your own information system or other setting, or otherwise for your own purposes, you do so at your own risk. In no event shall the State of Delaware or its agencies, officers, employees, agents, or representatives be liable for any damages of any kind or nature whatsoever including, but not limited to, direct, indirect, special, punitive, incidental, exemplary or consequential damages arising from your downloading, modifying, sharing, distributing, or using of FirstMap Data even if notified of the possibility of such damages. Further, the State of Delaware does not accept liability for any damages or misrepresentation caused by inaccuracies in the FirstMap Data or as a result of changes to the FirstMap Data, nor is there responsibility assumed to maintain the FirstMap Data in any manner or form.</span></p></div></div></div> No restrictions apply to these data. VQ-1560i; TerraScan v22.007; TerraModel v22.06; Global Mapper Pro v24; Windows 10 Pro true -75.8268 -75.0124 39.8529 38.4435 ground condition 2023-03-17 2023-03-18 2023-03-19 2023-03-20 2023-03-26 2023-03-27 2023-03-28 2023-03-29 2023-03-30 2023-03-31 2023-04-02 2023-04-05 2023-04-06 2023-04-11 2023-04-13 2023-05-11 USGS Contract No. 140G0223F0125 CONTRACTOR: SAM Lidar data were acquired and calibrated by SAM. All follow-up processing was completed by the prime contractor. 1 -75.826188 -75.038846 39.852923 38.443543 SAM, U.S. Geological Survey <DIV STYLE="text-align:Left;"><DIV><P><SPAN>None.</SPAN></P></DIV></DIV> The State of Delaware makes no warranty or representation, expressed or implied, with respect to the quality, content, accuracy, completeness, currency, or non-infringement of proprietary rights, of any of the GIS or other data or information, or any other materials and items, that are displayed or made available for download from this site. All such data, information, items and materials (collectively, the “FirstMap Data”) are provided "as is" and users are fully and solely responsible for any consequences of use. FirstMap Data may have been created from a variety of sources, including sources beyond the control of the State of Delaware, and are subject to change without notice. To the extent you use, apply, add to, modify or implement this information in your own information system or other setting, or otherwise for your own purposes, you do so at your own risk. In no event shall the State of Delaware or its agencies, officers, employees, agents, or representatives be liable for any damages of any kind or nature whatsoever including, but not limited to, direct, indirect, special, punitive, incidental, exemplary or consequential damages arising from your downloading, modifying, sharing, distributing, or using of FirstMap Data even if notified of the possibility of such damages. Further, the State of Delaware does not accept liability for any damages or misrepresentation caused by inaccuracies in the FirstMap Data or as a result of changes to the FirstMap Data, nor is there responsibility assumed to maintain the FirstMap Data in any manner or form. None. None. Data covers the entire area specified for this project. Data covers the entire area specified for this project. These Bare-Earth DEMs were created using all ground points included in the LAS data files. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The Bare-Earth DEMs are of good quality and data passes Non-Vegetated Vertical Accuracy specifications. A visual qualitative assessment was performed to ensure data completeness. This data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 9.4(cm) RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 23 cm at a 95% confidence level. This data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 9.4(cm) RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 23 cm at a 95% confidence level. This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class. This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class. Hydro Flattened Bare-Earth DEM Creation: Hydro breaklines were collected for all inland ponds and lakes 0.8 hectare (~2 acres) or greater in surface area. Breakline vector data was draped and flattened to a single elevation for waterbody features at ground level or slightly below. Inland streams and river breaklines were captured for any water bodies greater than 30 meters in width. Those breaklines were draped to the Ground surface and enforced for monotonicity and to sure smooth contour crossings. Permanent islands within all waterbodies greater than 0.4 hectare (1 acre) were captured. Hydro Flattened Bare-Earth DEM Creation: Hydro breaklines were collected for all inland ponds and lakes 0.8 hectare (~2 acres) or greater in surface area. Breakline vector data was draped and flattened to a single elevation for waterbody features at ground level or slightly below. Inland streams and river breaklines were captured for any water bodies greater than 30 meters in width. Those breaklines were draped to the Ground surface and enforced for monotonicity and to sure smooth contour crossings. Permanent islands within all waterbodies greater than 0.4 hectare (1 acre) were captured. Using Global Mapper, the ground point class of the QL1 classified point cloud was used along with the hydro breakline data to create hydro flattened bare-earth DEMs in 32-bit floating point Geotiff raster format at a 0.5 meter resolution. The final hydro flattened DEM was delivered in a total of 2238 individual 1700 m x 1700 m tiles for the QL1 delivery area. 2023-12-01T00:00:00 3 3400 0.500000 3400 0.500000 1 1 0 -8440932.583800 4642274.443300 -8440932.583800 4844592.443300 -8353286.083800 4844592.443300 -8353286.083800 4642274.443300 -8397109.333800 4743433.443300 EPSG 6.18.3(9.3.1.2) Band_1 137.622253 -2.047453 32 m LiDAR DEM False False False False False None. None.