Adams County 201309 remote-sensing image 2013 OrthoImage in TIFF/TFW Format This raster dataset consists of 8-bit, 4-band (R, G, B, NIR) color orthoimagery. A digital orthoimage is a raster image processed from vertical aerial images in which displacement in the image due to sensor orientation and terrain relief have been removed. Orthoimagery combines the image characteristics of an image with the geometric qualities of a map. Unlike planimetric maps which depict natural and manmade features by means of lines, point symbols, texts and polygons, orthoimagery illustrate the actual images of features and are thus more easily interpreted than regular maps. The normal orientation of data in an orthoimage is by lines (rows) and samples (columns). Each line contains a series of pixels ordered from west to east with the order of the lines from north to south. Each image tile is stored in industry standard .TIFF (tagged interchange file format) with an associated true world header file. Aerial imagery was acquired during March 7 through March 26 from flying heights of approximately 7,500 feet above mean terrain. Each orthoimage tile is 5,000 feet X 5,000 feet in dimension, edge-tied with the adjacent tiles (no gap and no overlap). This dataset is published in NAD_1983_NSRS2007_StatePlane_Mississippi_West_FIPS_2302_Ft_US with units in feet. An orthoimage is useful as a layer of any geographic information system (GIS). It can function as a cartographic base for displaying, generating, and modifying associated digital planimetric data. Other applications include environmental impact assessments, disaster management, emergency evacuation planning, flood analysis, soil erosion assessment, facility management, ground-water and watershed analysis, right of way and road alignment, transportation network inventory and analysis, preliminary design studies, vegetation classification detection of physical features or attributes not possible at ground level, and a myriad of additional applications. 201309 unknown publication date Complete As needed -91.683 -91.125 31.772 31.187 Rectified Imagery OrthoImage 2013 OrthoImage 2013 2013 Adams County, MississppiAdams County, Mississippi May be distributed None. However, users should be aware that temporal changes may have occurred since this data set was collected and that some parts of the data may no longer represent actual surface conditions. Users should not use the data for critical applications without a full awareness of its limitations 8:30am - 5:30pm EST Stephen ChamplinMississippi Department of Environmental Quality (MDEQ)Geospatial Resources Division/Flood Mapping Director601-961-5506mailing and physical address

P.O. Box 2279

JacksonMS39225-2279USA Microsoft Windows7 Professional; ESRI ArcCatalog 9.2.5.1450 The digital imagery for each acquisition sortie is differentially rectified to produce orthophotography at a resolution of 6-inch. Once the imagery has passed quality control review, final radiometric adjustments are performed to create a uniform overall appearance. Compliance with the accuracy standard was ensured by the collection of airborne GPS data and surveyed ground control points at strategic locations. Horizontal accuracy is based on ground control and digital elevation model data provided by Sanborn Map Company that was used in the production of the digital orthoimagery. 1 The digital orthoimagery accuracy requirement meets the M2MapRequirement of ASPRS Class 1 of clearly identifiable features within the photography. The orthoimagery has been compared to the airborne GPS and surveyed ground control points to confirm the requirement has been met. For the orthophoto product, there is no vertical accuracy. 1 For the orthophoto product, there is no vertical accuracy. Aerial Images Several major processes were done before the Adams County orthophotos were produced namely: digital aerial photography, imagery processing and QC, softcopy aerial triangulation and QC, ortho-rectification and QC. Aerial Photography: Aerial Photography was acquired with 80 mm focal length, Micorsoft Utltracam Eagle precision digital aerial mapping camera during March, 2013 Aerial photography was flown at 7500 feet above mean terrain. Planes were deployed with gyro-stabilized mount and equipped with forward motion compensation, Airborne GPS and Intertial Measurement Unit.The photo mission was conducted under optimal atmospheric conditions and greater than 30 degree sun angle. 201303 The digital aerial imagery was transferred from the UCEcamera to a Mass Storage Unit (MSU) and shipped to Sanborn's main facility in Colorado Springs. Once downloaded, Data is processed via Micorsoft ultramap software from the raw camera format to a 4-band unsharpened color image and a pan image. An application is executed that outputs the mid-exposure pulse for each image. At this point a POS file contains processed photo files as input to the Aerial Triangulation process. Raw camera data files are archived on LTO3 tapes. The imagery is processed using Intergraph PPS processing software to create a 3-band color image in natural color (RGB) format. The images are archived (on LTO3 tapes) and removed from system when orthophotography production has been completed. 201303-201304 Softcopy (Digital) Aerotriangulation: This task involved the densification of ground control points, measurement of photo coordinates, computation and block adjustment to solve for exterior orientation parameters of individual photographs necessary for ortho-rectification. New ground control locations surveyed by the Sanborn map company; a combination of photo-identical points and targeted points were used. The ground control points were measured in a fully digital environment using softcopy stereoplotters and tie point and passpoints automatically generated. Analytical aerotriangulation computations and adjustment were done using ZI Imaging's ISAT software, which is capable of performing bundle block adjustments using a rigorous least squares analysis, and possesses error detection and removal facilities. Systematic error corrections for lens distortion, earth curvature, and atmospheric refraction. State-of-the-art software with highly sophisticated error-detection routines was used to perform the computation and bundle block adjustment. Trained aerial triangulation specialist analyzed both numerical printouts and graphical error vector output display to detect gaps or holes in the block due to missing tie points, pass points or ground control. 201305-201306 Masspoint Autocorrelation: Sanborn will use autocorrelation to capture masspoints in areas not containing a DEM. This process uses SimActive Auto-Correlator 3D (SimActive) software. SimActive is a graphic processing unit (GPU) enabled software that can mass-produce the DEM surface at least five times more efficiently than the traditional auto-correlation engines. SimActive generates DEM points from digital aerial images and has a high overall accuracy. SimActive provides a large number of terrain points with medium accuracy by matching identical features in each of the stereo models. SimActive then filters these points to create a very precise masspoint grid for the entire model, or within a predefined collection boundary. SimActive will produce a grid of high density masspoints with an accuracy of approximately 1/10,000 of the flying height of aerial imagery obtained under optimal conditions. SimActive surface modeling parameters will be tailored to the terrain types in the project area to ensure high accuracy masspoints. 201307 Orthorectification: This task involved orthorectification of the raw digital raster images that were created from processing of MICROSOFT EAGLE digital camera data. A number of image processing techniques were used to maximize the quality of the deliverable images. All operations were performed using Sanborn's proprietary APS (METRO) software. The un-rectified raster images were georeferenced to the Adams County Auto-Correlated Surface using the digital aerotriangulation result and aerial camera data. Digital orthoimagery was created by draping the un-rectified raster images over their corresponding digital terrain models. All relief displacement was removed from the raw image files at ground level on a pixel-by-pixel basis using mathamatical pixel manipulation and seams, yielding a set of orthorectified digital photo images. Mosaicking was performed to ensure a perfect edge match between all orthoimage tiles. Seam lines were generated automatically and manually manipulated where necessary to ensure that no image flaws result from seam lines passing through tall structures. Seamline calculations bring in radiometric values of the pixels that are used first and then the terrain is brought into the equation. The software uses the radiometric values to go around cars and buildings the best it can. If the software detects a substantial change in the surface (like steep hills to cliffs), the software will try to compensate with another image, to avoid smearing of the imagery. If the seams would not compensate for the surface change, it would create a smear or the hillside would be more stretched than it should be. There will be on occasion patches of seams hiding these terrain changes. All orthoimagery tiles were generated butt joints, no overlaps nor gaps. Radiometric adjustment was performed to balance and match color tones, brightness and contrast of the imagery over the whole project. Color orthoimagery were produced 8-bit per channel, resulting in 32-bit RGB, .tif/.tfw format with a pixel size of 6-inch. Ortho tiles were generated according to the pre-approved County orthoimagery tile layout, with tiles 5,000' X 5,000'. Orthoimages were compressed on a County basis to .sid/.sdw format at a 20:1 compression ratio to develop a MrSID format mosaic. 201307-201308 Quality Control All orthophoto tiles were thoroughly inspected according to Sanborn QA/QC quality control procedures. Comprehensive visual inspection includes the review of the mosaicking, image smearing and color balancing across the entire project. 201308-201309 Metadata imported. 201309 0 Raster Pixel State Plane Coordinate System 23020.99995000-90.3333333329.500000002296583.333333330.00000000 row and column 6in6in survey feet North American Datum of 1983 Geodetic Reference System 80 6378137.000000000000000000 298.257222101000020000 GCS_North_American_1983NAD_1983_NSRS2007_StatePlane_Mississippi_West_FIPS_2302_Ft_US North American Vertical Datum of 1988 feet Implicit coordinate 6in North American Vertical Datum of 19886infeetAttribute values Geospatial Resources Division/Flood Mapping Director 601-961-5506 8:30am - 4:30pm EST Stephen ChamplinMississippi Department of Environmental Quality (MDEQ)mailing and physical address

P.O. Box 2279

JacksonMS39225-2279USA TIFF 275456 20120723 Sanborn Map Company Derek Hoshijo 8:30am - 4:30pm EST mailing address

1935 Jamboree Drive, Suite 100

Colorado SpringsCO80920USA719-593-0093 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time 201312100858090020131210