NAIP_1M_CLRIR_2008

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: VT Center for Geographic Information
Publication_Date: 20090430
Publication_Time: unknown
Title: NAIP_1M_CLRIR_2008
Edition: 2008A
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: NAIP imagery (2008) - statewide
Issue_Identification: 2008A
Publication_Information:
Publication_Place: Waterbury VT 05676
Publisher: VT Center for Geographic Information
Other_Citation_Details: Tile Structure - QQUAD
Citation:
Citation_Information:
Originator:
USDA-FSA-APFO Aerial Photography Field Office and 3001 Inc. (contractor)
Publication_Date: 20090430
Title: NAIP Digital Ortho Photo Image
Geospatial_Data_Presentation_Form: remote-sensing image
Publication_Information:
Publication_Place: Salt Lake City, Utah
Publisher: USDA-FSA-APFO Aerial Photography Field Office
Description:
Abstract:
The NAIP_1M_CLRIR_2008 dataset is a 1:40000 scale (1 meter) truecolor and infrared (4 band) NAIP imagery product acquired during the summer of 2008.
This data set contains imagery from the National Agriculture Imagery Program (NAIP). 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 of ortho imagery within one year of acquisition. NAIP provides four main products: 1 meter ground sample distance (GSD) ortho imagery rectified to a horizontal accuracy of within +/- 5 meters of reference digital ortho quarter quads (DOQQ's) from the National Digital Ortho Program (NDOP); 2 meter GSD ortho imagery rectified to within +/- 10 meters of reference DOQQs; 1 meter GSD ortho imagery rectified to within +/- 6 meters to true ground; and, 2 meter GSD ortho imagery rectified to within +/- 10 meters to true ground. The tiling format of NAIP imagery is based on a 3.75' x 3.75' quarter quadrangle with a 300 meter buffer on all four sides. NAIP quarter quads are formatted to the UTM coordinate system using NAD83. NAIP imagery may contain as much as 10% cloud cover per tile.
Purpose:
NAIP imagery is 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 GSD product provides an ortho image base for Common Land Unit boundaries and other data sets. The 1 meter 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. With an annual cycle, NAIP is also used for disaster response often providing the most current pre-event imagery. While suitable for a variety of uses the 2 meter GSD NAIP imagery is primarily intended to assess crop condition and compliance to USDA farm program conditions. The 2 meter imagery is generally acquired only for agricultural areas within state projects.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200808
Currentness_Reference: Ground Condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -72.9375
East_Bounding_Coordinate: -72.8750
North_Bounding_Coordinate: 43.0000
South_Bounding_Coordinate: 42.9375
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: imageryBaseMapsEarthCover
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: farming
Theme_Keyword: Digital Ortho rectified Image
Theme_Keyword: Ortho Rectification
Theme_Keyword: Quarter Quadrangle Centered
Theme_Keyword: NAIP
Theme_Keyword: Aerial Compliance
Theme_Keyword: Compliance
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: VT
Access_Constraints:
VCGI and the State of VT make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.
Use_Constraints:
For all products, services, Internet Website, and data, excepting digital or hardcopy orthophotography collected through the VT Tax Department’s Mapping Program, the direct, non-value added, reproduction of State of Vermont or VCGI’s products, services, Website, or data with intent to sell is prohibited without the written consent of VCGI. For all digital or hardcopy orthophotography collected through the VT Tax Department’s Mapping Program, copying, reprinting, duplicating, selling or attempting to sell is prohibited. Vermont Statute 32 V.S.A. § 3409 permits a fine, not to exceed $1,000.00, for any person violating this prohibition.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: VT Center for Geographic Information
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 1 National Life Dr, Dewey Building, 2nd Floor
City: Montpelier
State_or_Province: VT
Postal_Code: 05620-2001
Country: USA
Contact_Voice_Telephone: (802) 585-0820
Contact_TDD/TTY_Telephone: None
Contact_Facsimile_Telephone:
Contact_Electronic_Mail_Address: vcgi@vermont.gov
Hours_of_Service: 9am - 5pm, M-F
Data_Set_Credit:
USDA-FSA-APFO Aerial Photography Field Office, 3001 Inc. (NAIP contractor), VCGI, UVM Spatial Analysis Lab (SAL), and other contributors to the VT NAIP 2008 project.
Security_Information:
Security_Classification_System: N/A
Security_Classification: Unclassified
Security_Handling_Description: No Security Considerations
Native_Data_Set_Environment: Unknown

Data_Quality_Information:
Logical_Consistency_Report:
NAIP 3.75 minute tile file names are based on the USGS quadrangle naming convention.
Completeness_Report: None
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: FSA Digital Orthophoto Specs.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
USDA-FSA-APFO Aerial Photography Field Office and 3001 Inc. (contactor)
Publication_Date: 20090430
Title: NAIP 2008 Vermont
Geospatial_Data_Presentation_Form: remote-sensing image
Type_of_Source_Media: Digital Linear Tape (DLT)
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200808
Source_Currentness_Reference: Aerial Photography Date for aerial photo source.
Source_Citation_Abbreviation: Georectifed Image
Source_Contribution: Digital Georectifed Image.
Process_Step:
Process_Description:
The imagery was collected at a flying height of 28000 ft above mean terrain with 25% sidelap using an ADS40 digital sensor, giving the collected data nominal ground sampling distance of 0.9 meters. Collected data was downloaded to portable hard drives and shipped to the processing facility daily. Airborne GPS / IMU data was processed and reviewed to ensure sufficient accuracy for project requirements. 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 and sun glint. When necessary, image strips identified as not meeting image quality specifications were re-flown to obtain suitable imagery. Aerotriangulation blocks were defined primarily by order of acquisition and consisted of two to twelve strips. Image tie points points providing the observations for the least squares bundle adjustment were selected from the images using an autocorrelation algorithm. Photogrammetric control points consisted of photo identifiable points established using static and rapid-static GPS techniques. Final coordinate values were calculated using National Geodetic Survey (NGS) Online Positioning User Service (OPUS) or the NGS Online Positioning User Service-Rapid Static (OPUS-RS). 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 aerotriangulation solution for each block. Precedence was given to the photo identifiable control points over control provided by the ABGPS solution in the bundle adjustment. The triangulated strips were ortho-rectified to the USGS NED DEM for the project area. The images were re-sampled from the raw resolution of 0.9 meters to the required resolution of 1.0 meters using a cubic convolution filter during the process. The red, green, blue, and NIR 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 mosaicing steps. The imagery was mosaicked using a combination of automated and manual seamline generation. The 12 bit data range was adjusted for display in standard eight bit image channels by defining a piecewise histogram stretch. 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. Each DOQQ clipped from the mosaic was reviewed for conformance to APFO histogram metrics and color balance parameters using automated procedures. Images flagged for non-conformance were reviewed and adjusted manually on an image by image basis to bring them into conformance. In extreme cases, such as when a DOQQ was comprised primarily of water, modification of the histogram metrics to match targets caused severe degradation of image quality. In these cases, the water was masked out and histogram adjustments were applied to land. GeoTIFF tags for the appropriate UTM zone were then applied to all images.
Process_Date: 20090430
Process_Step:
Process_Description:
The GeoTIFFs were generated by reprojecting the original UTM files via ERDAS IMAGINE. The work was completed b Jarlath O'Neil-Dunne at the UVM Spatial Analysis Lab (SAL). The images were then cropped to the quarter quad "envelope" by VCGI to eliminate nodata areas.
Process_Date: 20090701
Process_Step:
Process_Description:
UVM Spatial Analysis Lab (SAL) generated JPEG2000 compressed (20x) files from the reprojected GeoTIFFs.
Process_Date: 20090715
Process_Step:
Process_Description: VCGI posted data to VCGI Image Library for download.
Process_Date: 20090801
Cloud_Cover: 5%

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: Raster
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 1
Column_Count: 1

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 4400
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999964
Longitude_of_Central_Meridian: -72.500000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.001
Ordinate_Resolution: 0.001
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 1 / 298.25722210

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: 32-bit pixels, 4 band color(RGBIR) values 0 - 255
Entity_and_Attribute_Detail_Citation: None

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: VT Center for Geographic Information
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 1 National Life Dr, Dewey Building, 2nd Floor
City: Montpelier
State_or_Province: VT
Postal_Code: 05620-2001
Country: USA
Contact_Voice_Telephone: (802) 585-0820
Contact_TDD/TTY_Telephone: None
Contact_Facsimile_Telephone:
Contact_Electronic_Mail_Address: vcgi@vermont.gov
Hours_of_Service: 9am - 5pm, M-F
Resource_Description: NAIP_1M_CLRIR_2008
Distribution_Liability:
VCGI and the State of Vermont make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: JPEG2000 and GeoTIFF
Format_Specification: JPEG2000 (20x compression) and GeoTIFF
Format_Information_Content: geospatial data
File_Decompression_Technique: Image viewer
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://maps.vcgi.vermont.gov/gisdata/vcgi/imagery/NAIP/1M/CLRIR/2008/COMP/
Access_Instructions:
Download compressed (JPEG2000) from web site. Uncompressed GeoTIFF available on offline media.
Offline_Option:
Offline_Media: USB drive
Fees:
No charge when downloading from the internet, and when no custom processing is required.
Ordering_Instructions: Send an email describing data request to vcgi@vermont.gov
Turnaround: About 5 days.
Custom_Order_Process: Send an email describing data request to vcgi@vermont.gov
Technical_Prerequisites: GIS Software
Available_Time_Period:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20090701
Time_of_Day: Unknown

Metadata_Reference_Information:
Metadata_Date: 20090624
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: VT Center for Geographic Information
Contact_Person: GIS Database Administrator
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 1 National Life Dr, Dewey Building, 2nd Floor
City: Montpelier
State_or_Province: VT
Postal_Code: 05620-2001
Country: USA
Contact_Voice_Telephone: (802) 585-0820
Contact_TDD/TTY_Telephone: None
Contact_Facsimile_Telephone:
Metadata_Standard_Name: FGDC Content Standards for Digital Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: Local time
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None
Metadata_Security_Information:
Metadata_Security_Classification_System: N/A
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: No security considerations

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