NAIP_1M_CLRIR_2011

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: VT Center for Geographic Information

Publication_Date: 20120621

Publication_Time: unknown

Title: NAIP_1M_CLRIR_2011

Edition: 2011A

Geospatial_Data_Presentation_Form: raster digital data

Series_Information:

Series_Name: NAIP imagery (2011) - statewide

Issue_Identification: 2011A

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

Publication_Date: 20120112

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_2011 dataset is a 1:40000 scale (1 meter) truecolor and infrared (4 band) NAIP imagery product acquired during the summer/fall of 2011 by the USDA-FSA-APFO NAIP program, then reprojected to VT State Plane Meters and cropped to the USGS quarter quad boundary by VCGI.
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:

Range_of_Dates/Times:

Beginning_Date: 20110722

Ending_Date: 20111007

Currentness_Reference: Ground Condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Irregular

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -72.7500

East_Bounding_Coordinate: -72.6875

North_Bounding_Coordinate: 42.8125

South_Bounding_Coordinate: 42.7500

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: None

Use_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.

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

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

Publication_Date: 20120112

Title: NAIP 2011

Geospatial_Data_Presentation_Form: remote-sensing image

Type_of_Source_Media: UnKnown

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20110722

Ending_Date: 20111007

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 using ADS40-SH52 digital sensors. Collection was performed using a combination of twin-engine aircraft flying at an average flying height of 17500 and 27000 ft above mean terrain, with nominal sidelap of 21%, giving the collected data nominal ground sampling distance of 0.55 and 0.75 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. Aerotriangulation 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 autocorrelation 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 aerotriangulation solution for each block using Pictovera software. Upon final 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 0.55 or 0.75 meters to the required resolution of 1.0 meters. 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, 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 mosaicking steps. The imagery was mosaicked using manual seamline 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.

Process_Date: 20120112

Process_Step:

Process_Description:

The GeoTIFFs were generated by reprojecting the original UTM files and

then cropped to the quarter quad "envelope" by VCGI to eliminate nodata areas.

Process_Step:

Process_Description:

VCGI generated JPEG2000 compressed (20x) files from the reprojected GeoTIFFs.

Process_Date: 20120520

Process_Step:

Process_Description: VCGI posted data to VCGI Image Library for download.

Process_Date: 20120626

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_2011

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/2011/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: 20110624

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