USDA-FSA-APFO 20131211 Salt Lake City, Utah USDA_FSA_APFO Aerial Photography Field Office This data set contains imagery from the National Agriculture Imagery Program (NAIP). The NAIP acquires digital ortho imagery during the agricultural growing seasons in the continental U.S.. A primary goal of the NAIP program is to enable availability of ortho imagery within one year of acquisition. The NAIP provides two main products: 1 meter ground sample distance (GSD) ortho imagery rectified to a horizontal accuracy within +/- 5 meters of reference digital ortho quarter quads (DOQQ's) from the National Digital Ortho Program (NDOP) or from the National Agriculture Imagery Program (NAIP); 1 meter or 1/2 meter GSD ortho imagery rectified within +/- 6 meters to true ground. The tiling format of NAIP imagery is based on a 3.75' x 3.75' quarter quadrangle with a 300 pixel buffer on all four sides. The NAIP imagery is formatted to the UTM coordinate system using the North American Datum of 1983 (NAD83). The NAIP imagery may contain as much as 10% cloud cover per tile. This file was generated by compressing NAIP imagery that cover the county extent. Two types of compression may be used for NAIP imagery: MrSID and JPEG 2000. The target value for the compression ratio is (15:1) for the 1 meter imagery and 60:1 for the 1/2 meter imagery. The NAIP imagery is typically available for distribution within 60 days of the end of a flying season and is intended to provide current information of agricultural conditions in support of USDA farm programs. For USDA Farm Service Agency, the 1 meter and 1/2 meter GSD product provides an ortho image base for Common Land Unit boundaries and other data sets. The NAIP imagery is generally acquired in projects covering full states in cooperation with state government and other federal agencies who use the imagery for a variety of purposes including land use planning and natural resource assessment. The NAIP is also used for disaster response often providing the most current pre-event imagery. 2013 Photography Source Image Dates. Complete Irregular -76.7500 -76.3750 38.8750 38.2500 None farming Digital Ortho rectified Image Mosaic Quarter Quadrangle Ortho Rectification Compression MrSID JPEG 2000 NAIP Compliance Aerial Compliance Geographic Names Information System MD Calvert CALVERT CO MD FSA 24009 There are no limitations for access. None, The USDA-FSA Aerial Photography Field Office asks to be credited in derived products. If defects are found in the NAIP imagery during the 1 year warranty period such as horizontal offsets, replacement imagery may be provided. Imagery containing defects that require the acquisition of new imagery, such as excessive cloud cover, specular reflectance, etc., will not be replaced within a NAIP project year. USDA-FSA Aerial Photography Field Office mailing and physical address

2222 West 2300 South

Salt Lake City Utah 84119-2020 USA 801-844-2922 801-956-3653 apfo.sales@slc.usda.gov None None None MrSID Compress Publisher NAIP 3.75 Quarter Quadrangles mosaicked into a County format using data compression software. The target values for the compression ratio is (15:1) for the 1 meter imagery and 60:1 for the 1/2 meter imagery. NAIP 3.75 minute tile file names are based on the USGS quadrangle naming convention. None FSA Digital Orthophoto Specs. N/A 2d only Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130912 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. Aerial Photography Field Office 20140205 40000 PHD 20130915 Aerial Photography Date for aerial photo source. Georectified Image NAIP Digital Quarter Quadrangle used in Mosaicked County Image. CCM Production Process Description USDA FSA APFO NAIP Program 2013 State: Maryland The imagery was collected using ADS40-SH51 digital sensors. Collection was performed using a combination of twin-engine aircraft flying at 17,500 ft above mean terrain with 25% sidelap, giving the collected data nominal ground sampling distance of 0.7 meters. Based-upon the CCD Array configuration present in the ADS40 digital sensor, imagery for each flight line is 12,000-pixels in width. Red, Green, Blue, Near-Infrared and Panchromatic image bands were collected. Collected data was downloaded to portable hard drives and shipped to the processing facility daily. Raw flight data was extracted from external data drives using GPro software. Airborne GPS / IMU data was post-processed using IPAS, PosPac and/or TerraPos software and reviewed to ensure sufficient accuracy for project requirements. Using Pictovera software, planar rectified images were generated from the collected data for use in image quality review. The planar rectified images were generated at five meter resolution using a two standard deviation histogram stretch. Factors considered during this review included but were not limited to the presence of smoke and/or cloud cover, contrails, light conditions, sun glint and any sensor or hardware-related issues that potentially could result in faulty data. When necessary, image strips identified as not meeting image quality specifications were re-flown to obtain suitable imagery. Aero triangulation blocks were defined primarily by order of acquisition and consisted of four to seventeen strips. Image tie points providing the observations for the least squares bundle adjustment were selected from the images using an auto correlation algorithm. Photogrammetric control points consisted of photo identifiable control points, collected using GPS field survey techniques. The control points were loaded in to a softcopy workstation and measured in the acquired image strips. A least squares bundle adjustment of image pass points, control points and the ABGPS was performed to develop an aero triangulation solution for each block using Pictovera software. Upon final bundle adjustment, the triangulated strips were ortho-rectified to the digital elevation model (DEM) The most recent USGS 10 meter DEMs were used in the rectification process. Positional accuracy was reviewed in the rectified imagery by visually verifying the horizontal positioning of the known photo-identifiable survey locations using ArcGIS software. The red, green, and blue bands were combined to generate a final ortho-rectified image strip. The ADS40 sensor collects twelve bit image data which requires radiometric adjustment for output in standard eight bit image channels. The ortho- rectified image strips were produced with the full 12 bit data range, allowing radiometric adjustment to 8 bit range to be performed on a strip by strip basis during the final mosaicking steps. The imagery was mosaicked using manual seam line generation in Orthovista Seam Editor (OVSE). The 12 bit data range was adjusted for display in standard eight bit image channels by defining a piecewise histogram stretch using OrthoVista software. A constant stretch was defined for each image collection period, and then strip by strip adjustments were made as needed to account for changes in sun angle and azimuth during the collection period. Strip adjustments were also made to match the strips histograms as closely as possible to APFO specified histogram metrics and color balance requirements. Automated balancing algorithms were applied to account for bi- directional reflectance as a final step before the conversion to 8 bit data range. APFO specified DOQQs were extracted from the final mosaic in GeoTIFF format. 4-Band DOQQs were produced and 3-Band RGB CCMs were created. DOQQs corresponding to an individual CCM were reviewed for overall color balance within the CCM. Local corrections were made where necessary to ensure uniformity within the CCM. In the case of DOQQs occurring in more than one CCM, a separate version of the image was generated and balanced for each CCM it occurred in. The color balanced DOQQs were then compressed to MrSID Generation 3 format at 15:1 compression ratio to create a composite CCM 20131211 Calvert, MD Raster Pixel Universal Transverse Mercator 18 0.9996 75W 0.0 500000 0.0 row and column 1 1 meters North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 24-bit pixels, 3 band color(RGB) values 0 - 255 None Supervisor Customer Services Section USDA-FSA Aerial Photography Field Office mailing and physical address

2222 West 2300 South

Salt Lake City Utah 84119-2020 USA 801-844-2922 801-956-3653 apfo.sales@slc.usda.gov Spot Number: 482512 In no event shall the creators, custodians, or distributors of this information be liable for any damages arising out of its use ( or the inability to use it). Compressed County Mosaic Natural Color None DVD-R ISO 9660 USB Hard Disk NTFS FireWire Hard Disk NTFS Contact the Aerial Photography Field Office for more information 20131211 USDA-FSA Aerial Photography Field Office mailing and physical address

2222 West 2300 South

Salt Lake City Utah 84119-2020 USA 801-844-2900 Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 This data set contains imagery from the National Agriculture Imagery Program (NAIP). The NAIP acquires digital ortho imagery during the agricultural growing seasons in the continental U.S.. A primary goal of the NAIP program is to enable availability of ortho imagery within one year of acquisition. The NAIP provides two main products: 1 meter ground sample distance (GSD) ortho imagery rectified to a horizontal accuracy within +/- 5 meters of reference digital ortho quarter quads (DOQQ's) from the National Digital Ortho Program (NDOP) or from the National Agriculture Imagery Program (NAIP); 1 meter or 1/2 meter GSD ortho imagery rectified within +/- 6 meters to true ground. The tiling format of NAIP imagery is based on a 3.75' x 3.75' quarter quadrangle with a 300 pixel buffer on all four sides. The NAIP imagery is formatted to the UTM coordinate system using the North American Datum of 1983 (NAD83). The NAIP imagery may contain as much as 10% cloud cover per tile. This file was generated by compressing NAIP imagery that cover the county extent. Two types of compression may be used for NAIP imagery: MrSID and JPEG 2000. The target value for the compression ratio is (15:1) for the 1 meter imagery and 60:1 for the 1/2 meter imagery. MD Calvert CALVERT CO MD FSA 24009 farming Digital Ortho rectified Image Mosaic Quarter Quadrangle Ortho Rectification Compression MrSID JPEG 2000 NAIP Compliance Aerial Compliance The NAIP imagery is typically available for distribution within 60 days of the end of a flying season and is intended to provide current information of... Calvert_2013_NAIP