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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. |
| summary:
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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. |
| accessInformation:
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SAM, U.S. Geological Survey |
| thumbnail:
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| maxScale:
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18025.642550129425 |
| typeKeywords:
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["ArcGIS Server","Data","Image Service","Service"] |
| description:
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<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> |
| licenseInfo:
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<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> |
| catalogPath:
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| title:
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DE_Lidar_DEM_2023 |
| type:
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Image Service |
| url:
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https://tst2epbfirstmap.dti.state.de.us:6443/arcgis |
| tags:
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["Model","Bare-Earth DEM","Remote Sensing","Elevation Data","Lidar","QL1","Delaware","Maryland"] |
| culture:
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en-US |
| portalUrl:
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| name:
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DE_Lidar_DEM_2023 |
| guid:
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| minScale:
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3.691651594266506E7 |
| spatialReference:
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NAD_1983_2011_StatePlane_Delaware_FIPS_0700 |