ItemInfo

Item Information

snippet:	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 DEMs. The purpose of these LiDAR data was to produce high accuracy 3D hydro-flattened digital elevation models (DEMs) with a 2 foot cell size. These raw LiDAR point cloud data were used to create classified LiDAR LAS files, intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.
summary:	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 DEMs. The purpose of these LiDAR data was to produce high accuracy 3D hydro-flattened digital elevation models (DEMs) with a 2 foot cell size. These raw LiDAR point cloud data were used to create classified LiDAR LAS files, intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.
accessInformation:	DGI
thumbnail:
maxScale:	134424.17995751
typeKeywords:	["Data","Service","Image Service","ArcGIS Server"]
description:	<div style='text-align:Left;'><div><div><p><span>Product: These are Digital Elevation Model (DEM) data for Kentucky as part of the required deliverables for the KYAPED_Lidar_2023 project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 2 foot hydro-flattened Raster DEM. Geographic Extent: 79 counties in Kentucky, covering approximately 18050 total square miles. Dataset Description: The KYAPED_Lidar_2023 project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.71 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, 2023 Rev. A. The data were developed based on a horizontal projection/datum of NAD 1983 StatePlane Kentucky FIPS 1600 Feet, Foot US and vertical datum of NAVD88 Geoid 12b, Foot US. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 20384 individual 5000 ft x 5000 ft tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 5000 ft x 5000 ft schema. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in winter 2022 and 2023, while no snow was on the ground and rivers were at or below normal levels. In order to post process the LiDAR data to meet task order specifications and meet ASPRS vertical accuracy guidelines, NV5 Geospatial utilized a total of 226 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 561 independent accuracy checkpoints, 331 in Bare Earth and Urban landcovers (331 NVA points), 230 in Tall Weeds categories (230 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.</span></p></div></div></div>
licenseInfo:	<div style='text-align:Left;'><div><div><p><span>None. However, 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 their limitations. Acknowledgement of the organization providing these data to the public would be appreciated for products derived from these data.</span></p></div></div></div>
catalogPath:
title:	Ky_DEM_KYAPED_2FT_Phase3
type:	Image Service
url:	https://kyraster.ky.gov/arcgis/services
tags:	["Model","Raster","DEM","Remote Sensing","Elevation Data","Lidar","Kentucky","Adair County","Allen County","Anderson County","Barren County","Bath County","Bell County","Bourbon County","Boyle County","Breathitt County","Buchanan County","Bullitt County","Campbell County","Casey County","Claiborne County","Clark County","Clay County","Clinton County","Cumberland County","Dickenson County","Edmonson County","Estill County","Floyd County","Franklin County","Garrard County","Green County","Harlan County","Harrison County","Hart County","Jackson County","Jefferson County","Johnson County","Knott County","Knox County","Larue County","Laurel County","Lawrence County","Lee County","Leslie County","Letcher County","Lincoln County","Macon County","Madison County","Magoffin County","Marion County","Martin County","McCreary County","Menifee County","Mercer County","Metcalfe County","Mingo County","Monroe County","Montgomery County","Morgan County","Nicholas County","Oldham County","Owsley County","Perry County","Pickett County","Pike County","Powell County","Pulaski County","Robertson County","Rockcastle County","Russell County","Scott County","Sumner County","Taylor County","Washington County","Wayne County","Whitley County","Wise County","Wolfe County","Woodford County"]
culture:	en-US
name:	Ky_DEM_KYAPED_2FT_Phase3
guid:
minScale:	4301573.75864031
spatialReference:	NAD_1983_StatePlane_Kentucky_FIPS_1600_Feet