Pulaski County - (PAgis) 20061101 Arkansas Digital Ortho Program 2006 Little Rock, Arkansas County, Pulaski Online linkage paths are input using the following FTP URL, APPLICATION URL http://www.geostor.arkansas.gov/Portal/ftpaccess.htm http://www.geostor.arkansas.gov Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. This tile is provided as a digital ortho quarter-quarter-quadrangle (DOQQQ) 1-foot ground resolution, image cast on the State Plane South coordinate system on the North American Datum of 1983 (NAD83). The geographic extent of the DOQQQ is equivalent to a quarter-quarter-quadrangle plus the over edge ranges from a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points. The over edge is included to facilitate tonal matching for mosaicing and for the placement of the NAD83 and secondary datum corner ticks. The normal orientation of data 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. This series of DOQQQs was produced as a part of the Arkansas Digital Orthophotography Program headed by the Arkansas State Land Information Board and the Arkansas Geographic Information Office. The aerial photography used to create the digital images was flown between December 29, 2006 and Febuary 4, 2006. Ortho photography serve a variety of purposes, from interim maps to field references for Earth science investigations and analysis. The ortho is useful as a layer of a geographic information system and as a tool for maps, collecting new features and feature classes using heads-up digitizing and maintenance of existing feature classes using visual evidence of changes in the on-the-ground conditions. The 2006 digital orthos were captured with an ADS40 sensor. Pulaski Area GIS (PAgis) purchased orthos in the RGB (natural color) band combination. 20051229 20060204 ground condition Complete Irregular ISO 19115 Topic Category imageryBaseMapsEarthcover Arkansas Geographic Information Office DOQ DOQQ Aerial Ortho Orthos Photos Photography Aerial Doq Doqq PAGIS LCSH - Library of Congress subject headings (Washington, DC: LC, Cataloging Distribution Service) United States Arkansas Pulaski County None None Arkansas Geographic Information Office Learon Dalby Arkansas GIS Program Manager mailing and physical address

124 West Capitol, Suite 900

Little Rock Arkansas 72201 USA 501-682-2929 501-682-2040 learon.dalby@arkansas.gov Monday - Friday 8:00 am - 5:00 pm CST Pulaski County - (PAgis) Unclassified Unclassified Unclassified ESRI ArcCatalog 9.1.0.722 Not Applicable Compliance with the accuracy standard was ensured by the collection of photo identifiable GPS ground control after the acquisition of aerial imagery. The following checks were performed. 1. The ground control and airborne GPS data stream were validated through a fully analytical bundle aerotriangulation adjustment. 2. The digital surface model data was checked against the project control. The technician visited and confirmed the accuracy of the points during initial processing 3. Digital orthophotography was validated through an inspection of edge matching and visual inspection for image quality. The following methods are used to assure imagery accuracy. 1. Use of IMU and ground control network utilizing GPS techniques. 2. Use of airborne GPS in conjunction with the acquisition of imagery. The following software is used for validation of the imagery and surface modeling 1. Aerotriangulation - ISTAR 2. DSM and DEM data - ISTAR 3. Digital Orthophotography - ISTAR 4. Bentley - MicroStation 5. ISTAR 6. ZI - OrthoPro 7. ESRI - ArcInfo 8. ERDAS Imagine 9. Terrascan 10. EarthData Proprietary software 11. Adobe - Photoshop The digital orthophotos were produced to be fully compliant with NMAS standards for horizontal accuracy of 1 to 2,400 scale mapping. EarthData Aviations 20060303 1 remote-sensing image 24,000 firewire 20051228 20060204 ground condition Aerial Acquisition The aerial imagery acquisition for the State of Arkansas was flown North - South to support the creation of digital orthophotography with a 1 foot pixel. The imagery was acquired in # sorties, the sorties were varying in size. This count includes reflights. The 1 foot pixel imagery were flown at 9,800 feet AMT. There were # flight lines. Imagery was flown with a 30% overlap between flight lines. All imagery was collected using the Leica ADS40 digital pushbroom sensor. The imagery was collected in 16 bit. Terra Surv INC. 20060303 1 model 2,400 electronic mail system 20060123 20060303 Ground Condition Ground Control TerraSurv Inc. was contracted by EarthData to acquire # photo identifiable ground control points during the acquisition of aerial imagery. The ground control points were established using GPS for vertical and horizontal coordinate values. NAD 83 (1986) NAVD 88 Meters State Plane The airborne GPS data were processed and integrated with the IMU. The results were imported into the ISTAR system for use in the aerotriangulation. The ADS40 imagery was downloaded onto the EarthData server and brought over to the UNIX based ISTAR system. The ground control was used in conjunction with the processed ABGPS results for the aerotriangulation. The properly formatted ISTAR results were used for subsequent processing. withheld 20060412 withheld EarthData International Raquel Charrois Project Manager mailing and physical address

7320 Executive Way

Frederick MD 21704 USA (301)-948-8550 (301)-963-2064 rcharrois@earthdata.com Mon - Fri 9:00am to 5:00pm EST This process describes the ISTAR digital surface modeling. ISTAR digital surface modeling is based on an auto correlated pixel-matching system within the ISTAR software. The auto correlated digital surface model (DSM) surface represents the initial surface model. This surface is then exported from the UNIX format into a MicroStation compatible format. The techniques used to process the ISTAR DSM (auto correlated surface model) are similar to those used for lidar processing. EarthData has developed a unique method for processing DSM data to identify and remove the majority of elevation points falling on vegetation, buildings, and other above ground structures for generation of the Digital Elevation Model (DEM). The algorithms for filtering data were utilized within EarthData's proprietary software and commercial software suite of tools provides efficient processing for small to large-scale, projects and has been incorporated into ISO 9001 compliant production work flows. The following is a step-by-step breakdown of the process. 1. Using the DSM ISTAR data set created by EarthData, the technician performed a visual inspection of the data to verify that the flight lines met correctly. The technician also verified that there were no voids, and that the data covered the project limits. The technician then selected a series of areas from the dataset and inspected them where adjacent flight lines met. 2. A process, which utilizes 3-D Analyst and EarthData's proprietary software was run to detect and color code the differences in elevation values and profiles. The technician reviewed this information and located the areas that contained systematic errors or distortions that needed to be removed for creation of a ground ortho. 3. Systematic distortions highlighted in step 2 were removed and the data were re-inspected. Corrections and adjustments can involve the application of angular deflection or compensation for curvature of the ground surface that can be introduced by crossing from one type of land cover to another. 4.The data were checked against the control network to ensure that vertical requirements were maintained. 5. The resulting product is a digital elevation model (DEM). This digital surface model has been through an automated filtering routine to remove the noise and above ground features. The digital surface model was used in the rectification of ground orthos. 6. The digital surface model data sets were converted to ASCII format and cut to the same tile layout as the final digital orthophotos. withheld 20060501 withheld EarthData International Raquel Charrois Project Manager mailing and physical address

7320 Executive Way

Frederick MD 21704 USA (301)-948-8550 (301)-963-2064 rcharrois@earthdata.com Mon - Fri 9:00 am to 5:00 pm EST Once the DSM data for the ortho areas were integrated into the ISTAR system the initial radiometric adjustments were performed on the imagery for each flight line attempting to reach the best possible histogram. The rectification process was run using the processed DSM and the radiometrically balanced imagery on each flight line. A second set of radiometric adjustments were made and mosaic lines were placed. Edge sharpening was applied. QA/QC was performed looking for smears and other indications of problems within the digital orthophoto creation process. The final imagery data set is removed from the ISTAR environment in a process called "packaging" where the individual tiles are created. The created tiles are reviewed again for anomalies and interactive radiometric adjustment applied where needed. The final digital ortho product was GeoTIFF with TFW. Data was delivered on firewire drive. withheld 20060505 withheld EarthData International Raquel Charrois Project Manager mailing and physical address

7320 Executive Way

Frederick MD 21704 USA 301-948-8550 rcharrois@earthdata.com Mon - Fri 9:00 am to 5:00 pm EST Metadata imported. withheld 20061012 15062900 0 Raster Pixel 399393 451570 1 State Plane Coordinate System 301 34.933333 36.233333 -092.000000 +34.333333 1312333.333333 0.00000000 row and column 1 1 Survey Feet North American Datum of 1983,1986 Adjustment Geodetic Reference System 80 6378137.000000 298.2572221010 GeoStor mailing and physical address

124 West Capitol, Suite 900

Little Rock Arkansas 72201 USA 501-682-2929 501-682-2040 GeoStor@arkansas.gov Monday - Friday 8:00 am - 5:00 pm CST Downloadable Data The data herein, including but not limited to geographic data, tabular data, analytical data, electronic data structures or files, are provided "as is" without warranty of any kind, either expressed or implied, or statutory, including, but not limited to, the implied warranties or merchantability and fitness for a particular purpose. The entire risk as to the quality and performance of the data is assumed by the user. No guarantee of accuracy is granted, nor is any responsibility for reliance thereon assumed. In no event shall the Arkansas Geographic Information Office be liable for direct, indirect, incidental, consequential or special damages of any kind, including, but not limited to, loss of anticipated profits or benefits arising out of use of or reliance on the data. The Arkansas Geographic Information Office does not accept liability for any damages or misrepresentation caused by inaccuracies in the data or as a result of changes to the data caused by system transfers or other transformations or conversions, nor is there responsibility assumed to maintain the data in any manner or form. This data has been developed from the best available sources. Although efforts have been made to ensure that the data is accurate and reliable, errors and variable conditions originating from physical sources used to develop the data may be reflected in the data supplied. Users must be aware of these conditions and bear responsibility for the appropriate use of the information with respect to possible errors, scale, resolution, rectification, positional accuracy, development methodology, time period, environmental and climatic conditions and other circumstances specific to this data. The user is responsible for understanding the accuracy limitations of the data provided herein. The burden for determining fitness for use lies entirely with the user. The user should refer to the accompanying metadata notes for a description of the data and data development procedures. Although this data has been processed successfully on computers at the Arkansas Geographic Information Office, no guarantee, expressed or implied, is made by Arkansas Geographic Information Office regarding the use of these data on any other system, nor does the act of distribution constitute or imply any such warranty. Distribution of these data is intended for information purposes and should not be considered authoritative for engineering, legal and other site-specific uses. Data can be searched, clipped, reprojected, reformated and retrieved by users through GeoStor //www.geostor.arkansas.gov There is no fee associated with acquiring data. Knowledge of GIS software and GIS concepts. 20061101 http://www.geostor.arkansas.gov http://www.geostor.arkansas.gov/Portal/ftpaccess.htm 20061009 20061009 Arkansas Geographic Information Office Learon Dalby Arkansas GIS Program Manager mailing and physical address

124 West Capitol, Suite 200

Little Rock Arkansas 72203 USA 501-682-2929 501-682-2040 learon.dalby@arkansas.gov Monday - Friday 8:00 am - 5:00 pm CST FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 Local time None None Unclassified Unclassified Unclassified 20061012 15012100 20061012 15062900 TRUE {21999BB0-860F-4CFD-94B7-B568298D002A} 20061012 withheld Local Area Network