{ "type": "Collection", "id": "DigitalCoast_DAV:id_9174", "stac_version": "1.1.0", "description": "This data set is tiled lidar point cloud LAS files v1.4, for the 2016 Alabama 25 County lidar area of interest (AOI). \n\t\t\t\nUSGS NGTOC task order G17PD00243 required Spring 2017 LiDAR surveys to be collected over 18,845 square miles covering part or all of 25 counties in Alabama. These counties are Autauga, Baldwin, Barbour, Bullock, Butler, Chambers, Cherokee, Clarke, Conecuh, Covington, Crenshaw, Elmore, Etowah, Henry, Houston, Lamar, Limestone, Macon, Monroe, Pike, Randolph, Russell, Shelby, Tallapoosa, and Winston. Aerial LiDAR data for this task order was planned, acquired, processed, and produced at an aggregate nominal pulse spacing (ANPS) of 0.7 meters and in compliance with USGS National Geospatial Program LiDAR Base Specification version 1.2. \n\nThe data are divided up in 8 blocks. Please see the kmz provided in the URL section of this metadata record for the block footprints.\nBlock 1 - Lamar, Limestone, Winston Counties\nBlock 2 - Cherokee, Etowah, Shelby Counties\nBlock 3 - Chambers, Randolph, Tallapoosa (partial) Counties\nBlock 4 - Autauga, Barbour (partial), Bullock (partial), Elmore, Macon, Russell Counties\nBlock 5 - Barbour (partial), Bullock (partial), Henry, Houston Counties\nBlock 6 - Barbour (partial), Bullock, (partial), Butler (partial), Conecuh (partial), Covington, Crenshaw, Pike Counties\nBlock 7 - Baldwin (partial), Butler (partial), Clarke, Conecuh (partial), Monroe Counties\nBlock 8 - Baldwin County (partial)\n\nIsolated gaps in GPS data were identified in several missions covering this project. As both, the IMU data and pulse data, were present across these gaps, using the fixed positions of the GPS on either end, the aircraft velocity across the gaps, and the IMU data, LiDAR calibration staff were able to reach an effective solution to address the GPS voids. Because these gaps were not uniform in size or correction, this extended the iterative LiDAR calibration efforts on this project. Subsequent rigorous data checking confirmed adequate results to meet the required accuracy specs. The USGS QA Team already reviewed affected data (blocks) for this project and found no QA/QC discrepancies to report regarding those gaps.\n\nGeographic Extent: This data set is consisting of lidar point cloud, classified lidar, digital elevation model, and lidar intensity images which all pieces encompasses the 2016 Alabama 25 County lidar (Pilot) area of interest (AOI), approximately 18,845 square miles or 48,408 square kilometers. \n\nData set Description: This data set consists of lidar point cloud LAS swath files and tiled LAS files. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. Each file represents a separate swath of lidar.\n\nGround Conditions: water at normal levels; no unusual inundation; no snow; leaf off\n\nHow the Withheld Points are Identified:\tWithheld (ignore) points were identified in the files using the standard LAS Withheld bit.\n\n\t\t\tClass Code:1\n\t\t\tClass Item:Unclassified\n\t\t\tClass Code:2\n\t\t\tClass Item:Ground\n\t\t\tClass Code:7\n\t\t\tClass Item:Low Noise\n\t\t\tClass Code:9\n\t\t\tClass Item:Water\n\t\t\tClass Code:10\n\t\t\tClass Item:Ignored Ground\n\t\t\tClass Code:17\n\t\t\tClass Item:Bridges\n\t\t\tClass Code:18\n\t\t\tClass Item:High Noise\n\nThe NOAA Office for Coastal Management (OCM) downloaded the laz files from these USGS sites and processed the data to the Data Access Viewer (DAV) and to https. The total number of files downloaded and processed was 23,054.\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_AL_25Co_B1_2017/ Number of files: 2305\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_AL_25Co_B2_2017/ Number of files: 2500\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_AL_25Co_B3_2017/ Number of files: 2243\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_AL_25Co_B4_2017/ Number of files: 3765\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_AL_25Co_B5_2017/ Number of files: 2505\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_AL_25Co_B6_2017/ Number of files: 3778\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_AL_25Co_B7_2017/ Number of files: 3879\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_AL_25Co_B8_2017/ Number of files: 2075\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/AL_25_County_Lidar_2017_B17/ Number of files: 4\n\n\nThe hydro breaklines were also downloaded from these USGS sites and are available for download at the link provided in the URL section of this metadata record. Please note that these products have not been reviewed by the NOAA Office for Coastal Management (OCM) and any conclusions drawn from the analysis of this information are not the responsibility of NOAA or OCM.\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_25_County_Lidar_2017_B17/AL_25Co_B1_2017/breaklines/\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_25_County_Lidar_2017_B17/AL_25Co_B2_2017/breaklines/\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_25_County_Lidar_2017_B17/AL_25Co_B3_2017/breaklines/\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_25_County_Lidar_2017_B17/AL_25Co_B4_2017/breaklines/\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_25_County_Lidar_2017_B17/AL_25Co_B5_2017/breaklines/\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_25_County_Lidar_2017_B17/AL_25Co_B6_2017/breaklines/\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_25_County_Lidar_2017_B17/AL_25Co_B7_2017/breaklines/\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_25_County_Lidar_2017_B17/AL_25Co_B8_2017/breaklines/\nftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/AL_25 20County 20Lidar_2017_B17/AL_25Co_TL_2017/breaklines/\n\n", "links": [ { "rel": "root", "href": "./collection.json", "type": "application/json", "title": "2016 - 2019 USGS Lidar: Alabama 25 County" }, { "rel": "self", "href": "https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9174/stac/collection.json", "type": "application/json" }, { "rel": "child", "href": "./b4/collection.json", "type": "application/json" }, { "rel": "child", "href": "./b1/collection.json", "type": "application/json" }, { "rel": "child", "href": "./b2/collection.json", "type": "application/json" }, { "rel": "child", "href": "./b3/collection.json", "type": "application/json" }, { "rel": "child", "href": "./b5/collection.json", "type": "application/json" }, { "rel": "child", "href": "./b6/collection.json", "type": "application/json" }, { "rel": "child", "href": "./b7/collection.json", "type": "application/json" }, { "rel": "child", "href": "./b8/collection.json", "type": "application/json" }, { "rel": "child", "href": "./tl/collection.json", "type": "application/json" } ], "stac_extensions": [ "https://stac-extensions.github.io/classification/v2.0.0/schema.json" ], "classification:classes": [ { "value": 0, "name": "Never_Classified", "description": "Never Classified" }, { "value": 1, "name": "Unclassified", "description": "Unclassified" }, { "value": 2, "name": "Ground", "description": "Ground" }, { "value": 3, "name": "Low_Vegetation", "description": "Low Vegetation" }, { "value": 6, "name": "Building", "description": "Building" }, { "value": 7, "name": "Low_Point__noise_", "description": "Low Point (noise)" }, { "value": 9, "name": "Water", "description": "Water" }, { "value": 10, "name": "Ignored_Ground__near_breakline_", "description": "Ignored Ground (near breakline)" }, { "value": 11, "name": "Road_Surface", "description": "Road Surface" }, { "value": 14, "name": "Wire-Conductor", "description": "Wire-Conductor" }, { "value": 17, "name": "Bridge_Deck", "description": "Bridge Deck" }, { "value": 18, "name": "High_Noise", "description": "High Noise" } ], "title": "2016 - 2019 USGS Lidar: Alabama 25 County", "extent": { "spatial": { "bbox": [ [ -88.27573076395144, 30.22019014596749, -84.88732089664498, 34.99984481858653 ] ] }, "temporal": { "interval": [ [ "2016-12-02T19:48:31Z", "2016-12-02T19:48:53Z" ] ] } }, "license": "CC-BY-1.0" }