Long islandproject period: 06 01 2024 - 05 31 2026PROJECT abstract summary:this project continues new york state s efforts to update statewide elevation data via light detection and ranging (lidar)…

Long islandproject period: 06 01 2024 - 05 31 2026PROJECT abstract summary:this project continues new york state s efforts to update statewide elevation data via light detection and ranging (lidar) collection in coordination with federal efforts. The planned project will cover all of two counties (nassau and suffolk) in NY along the atlantic ocean, replacing an older lidar-derived dataset. All new collections will meet at a minimum quality level 2 specifications, and are planned to begin in spring 2024. The current collection covering nassau and suffolk counties is from 2014 and has a point spacing of 0.7 meters. The proposed extents have significant overlap with existing data to provide sufficient data for checking and adjusting spatial alignment. Project areas were selected following discussions with federal emergency management agency (FEMA), united states department of agriculture-natural resources conservation service (USDA-nrcs) and united states geological survey (USGS) about in-progress and planned federal lidar collections. Project extents will include overlap with these existing projects to ensure no gaps and to allow for comparisons. Activities to be performedcontractor will collect airborne lidar, ground survey, perform classification, and generate all final productsnys performs the following tasks:review flight plans submitted by contractor for appropriate flying height and swath overlapreview survey plans to ensure sufficient control and checkpoint datacommunicate with contractor to track weather, ground conditions, equipment staging and progressreview ground control survey reports and lidar swath datareview classified point cloudreview horizontal accuracy using intensity imagesreview vertical accuracyreview data voidsreview hydroflattened demreview all final reports and metadatasubmit to USGS for final review, make any corrections identifieddeliverables and expected outcomesbare earthohydro flattened bare earth digital elevation models (DEM) 1 meter in geotiff formatohydro breaklines hydro breaklines used to create the bare earth rastersmetadataoreports reports and XML metadata oshapefiles supplemental shapefiles and or feature classesotherosupplemental data including, but not limited to, intensity imagery, swath separation images, etc.point cloudoclassified LAS filesintended beneficiariesnew york state agenciesfederal agenciespublic.