CT Buildings
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<div style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><span style='color:rgb(0,0,0); font-family:Arial; font-size:18px;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'><strong>Dataset Description:</strong> </span></span></div><div style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'> </div><div style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>The CT Statewide GIS Services Lidar project required the planning, acquisition, processing, and creation of derivative products from lidar data collected at a nominal pulse spacing (NPS) of 0.35 meters. Coastal areas were collected to achieve a point density of at least 20 points per square meter (ppsm), while all other areas met or exceeded 14 ppsm. Project standards followed the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 2023 rev. A.<br />The dataset was produced using the horizontal datum/projection NAD83 (2011), State Plane Connecticut, U.S. Survey Feet, and the vertical datum NAVD88 (GEOID18), U.S. Survey Feet. Deliverables included Classified LAS 1.4 files tiled into 23,381 tiles measuring 2,500 ft by 2,500 ft, tiled intensity imagery, and tiled bare-earth DEMs—all using the same tiling scheme.<br />Maximum Surface Height Raster and Swath Separation Image tiles 025645_se, 080655_ne, 085655_ne, 085655_nw, 090655_nw, 110660_se, and 135665_se were not provided because all lidar points within the corresponding LAS tiles were marked as withheld. LAS tile 110660_se consists entirely of water and contains no lidar returns; therefore, it is not included in the deliverables.</div><div style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'> </div><div style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><span style='font-size:18px;'><strong>Ground Conditions:</strong></span></div><div style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><br />Lidar data was collected in Spring 2023 under leaf-off conditions, with no snow cover and rivers at or below normal flow levels. To meet task order requirements and ASPRS vertical accuracy standards, Dewberry established 38 ground control points used to calibrate the lidar to known ground positions across the project area. An additional 247 independent accuracy checkpoints—145 in Bare Earth and Urban land cover types (NVA points) and 102 in Tall Grass and Brushland/Low Trees categories (VVA points)—were used to evaluate vertical accuracy. These independent checkpoints were not used in calibration or post-processing.</div><div style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><br /><span style='font-size:18px;'><strong>3D Buildings:</strong></span></div><div style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><br />The statewide 3D building data was merged into a single multipart feature class, processed in ArcGIS to create a scene layer package, and published to ArcGIS Online.<br /> </div><p style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1.5rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'> </p><p style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1.5rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'><strong>Geographic Extent</strong></span></span></p><ul><li><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'>Coverage: State of Connecticut</span></span></li></ul><p style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1.5rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'> </p><p style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1.5rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'><strong>Classifications</strong></span></span></p><ul><li><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'>Sensitivity: Public</span></span></li><li><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'>Usage: Public Use</span></span></li><li><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'>Quality: High Quality</span></span></li><li><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'>Known Quality Issues: None known, but subject to standard limitations of third-party commercial data</span></span></li></ul><p style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1.5rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'> </p><p style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(74, 74, 74); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; margin:0px 0px 1.5rem; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'><strong>Currency</strong></span></span></p><ul><li><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'>Created: 2023</span></span></li><li><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'>Update Frequency: Per Flight</span></span></li><li><span style='font-family:inherit;'><span style='border:0px solid currentcolor; box-sizing:border-box; line-height:1.5;'>Last Updated: August 2023</span></span></li></ul><p> </p><p style='text-align:center;'><span style='color:#000000; font-family:Verdana; font-size:13px;'><i><span style='display:inline !important; float:none; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'><strong> Layer will be updated after the completion of the 2026 flight.</strong></span></i></span></p>
提供机构：
State of Connecticut
