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Product: These data were acquired by the NC Collaboratory at UNC Chapel Hill utilizing funds appropriated by the NC General Assembly. This orthoimagery data set includes 6 in digital orthoimages in GeoTIFF tiles and 32-bit 4-band (RGBIR).Geographic Extent: 13 counties in NorthCarolina, covering approximately 5,323 total square miles. Counties covered in their entirety for this project included: Alexander, Ashe, Watauga, Avery, Mitchell, Burke, Yancey, McDowell, Rutherford, Buncombe, Henderson, Haywood, and Jackson. Dataset Description: The Helene-North Carolina Priority 1 Lidar and Imagery project called for the planning, acquisition, and processing of imagery data to be collected at a ground sample distance (GSD) of 6 in. Project specifications are based on the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. The data were developed based on a horizontal projection/datum of NAD 1983 2011 StatePlane North Carolina FIPS 3200 US Survey Foot. Imagery data were delivered as 6 in GeoTIFF tiles and 32-bit 4-band (RGBIR). Tiled deliverables contained 6,768 individual 5,000 ft x 5,000 ft tiles.Ground Conditions: Imagery was collected in spring 2025, and meets project acquisition parameters of being snow and ice free (though some light, undrifted snow may be present), no unusual flooding or water inundation, and leaf off conditions. The AECOM team established a total of 49 check points to assess the horizontal accuracy of the data, of which 39 were useable. The imagery data was post processed to meet task order specifications and was tested to meet ASPRS horizontal accuracy guidelines. Seamline editing and photoshop adjustments were focused on major transportation features due to the rapid response nature of the project and the need for damage analysis. Areas outside of major transportation features may exhibit seamline displacement and other anomalies such as smears.<\/span><\/p><\/div><\/div>", "name": "Imagery/Orthoimagery_Helene_2025", "description": "

Product: These data were acquired by the NC Collaboratory at UNC Chapel Hill utilizing funds appropriated by the NC General Assembly. This orthoimagery data set includes 6 in digital orthoimages in GeoTIFF tiles and 32-bit 4-band (RGBIR).Geographic Extent: 13 counties in NorthCarolina, covering approximately 5,323 total square miles. Counties covered in their entirety for this project included: Alexander, Ashe, Watauga, Avery, Mitchell, Burke, Yancey, McDowell, Rutherford, Buncombe, Henderson, Haywood, and Jackson. Dataset Description: The Helene-North Carolina Priority 1 Lidar and Imagery project called for the planning, acquisition, and processing of imagery data to be collected at a ground sample distance (GSD) of 6 in. Project specifications are based on the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. The data were developed based on a horizontal projection/datum of NAD 1983 2011 StatePlane North Carolina FIPS 3200 US Survey Foot. Imagery data were delivered as 6 in GeoTIFF tiles and 32-bit 4-band (RGBIR). Tiled deliverables contained 6,768 individual 5,000 ft x 5,000 ft tiles.Ground Conditions: Imagery was collected in spring 2025, and meets project acquisition parameters of being snow and ice free (though some light, undrifted snow may be present), no unusual flooding or water inundation, and leaf off conditions. The AECOM team established a total of 49 check points to assess the horizontal accuracy of the data, of which 39 were useable. The imagery data was post processed to meet task order specifications and was tested to meet ASPRS horizontal accuracy guidelines. Seamline editing and photoshop adjustments were focused on major transportation features due to the rapid response nature of the project and the need for damage analysis. 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