Metadata for Montana 2013 NAIP Orthophotos, Compressed County Mosaics Metadata for Montana 2013 NAIP Orthophotos, Compressed County Mosaics

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Identification Information:

Citation:

Originator: USDA-Farm Services Agency Aerial Photography Field Office

Publication date: 03/17/2014

Title: Montana 2013 NAIP Orthophotos, Compressed County Mosaics

Publication place: Salt Lake City, Utah
Publisher: USDA Farm Services Agency Aerial Photography Field Office

Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2013_NAIP/UTM_County_Mosaics

Larger Work Citation:

Title: Montana 2013 NAIP Orthophotos
Online linkage: http://mslapps.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={a5a64e60-aac0-11e3-9be7-425861b86ab6}

Abstract:

These data are color digital aerial photos, taken in the year 2013. They consist of 56 images that each cover a Montana county. They are orthorectified natural-color MrSID images with a ground resolution of 1 meter, and they are registered to the UTM coordinate system.

The data are also available as a downloadable collection of 698 compressed natural-color MrSID images, each 24 kilometers square. These images are in Montana State Plane coordinates, units meters. The web page for accessing these images is http://geoinfo.msl.mt.gov/data/Aerial_Photos/NAIP_2013.

The data are also available through a web service at https://gisservicemt.gov/arcgis/rest/services/MSDI_Framework/NAIP_2013/ImageServer.

The data are derived from a collection of 11,776 4-band (near infrared, red, green and blue) TIFF images in UTM coordinates. Each image is about 170 megabytes. The tiling format of the TIFF imagery is based on 3.75 x 3.75 minute quarter-quadrangles with a 300 pixel buffer on all four sides. Please contact the State Library if you need any of these images.

An ESRI shapefile showing the dates the images were collected is available at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2013_NAIP/naip_2013_dates.zip.

Time period of content:

Beginning date: 06/15/2013
Ending date: 09/11/2013
Currentness reference: Ground Condition

Status:

Maintenance and update frequency:: For information on future updates of the NAIP, see the Aerial Photography Field Office web site (http://www.apfo.usda.gov).

Access constraints: None

Use constraints:

The Originator asks to be credited in derived products.

These images were derived from a USDA interim product. Users should be aware that the interim compressed mosaic may contain defects and have horizontal accuracy less than the specified tolerances.

The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.

Point of contact:

Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov

Data Quality Information:

Horizontal Positional Accuracy Report:

NAIP horizontal accuracy specifications require a match of plus or minus 6 meters between objects on the ground and their position in the imagery.

Lineage:

Source information:

Originator:: U.S. Dept of Agriculture
Farm Services Agency
Aerial Photography Field Office
Publication date: 2013
Title: Aerial Photography
Beginning date: 06/15/2013
Ending date: 09/11/2013

Process step:

Digital imagery was collected at a nominal ground sample distance (GSD) of 1.0 meters using seven Cessna 441 aircraft flying at an average flight height of 9052m above ground level. All aircraft flew with Leica Geosystem's ADS80/SH82 digital sensors with firmware 3.20 or newer.

Each sensor collected 11 image bands. PanF27A,PanF02A and PanB14A panchromatic bands with a spectral range of 465-676nm. RedN00a and RedB16a with a spectral range of 604-664nm. GrnN00a and GrnB16a with a spectral range of 533-587nm. BluN00a and BluB16a with a spectral range of 420-492nm and Near-infrared bands NirN00a and NirB16a with a spectral range of 833-920nm. The CCD arrays have a pixel size of 6.5 microns in a 12000x1 format. Both the CCD's and the A/D convertors have a dynamic range of 12bits. The data is stored in 16bit format. The ADS is a push-broom sensor and the ground footprint of the imagery at NAIP scale is 12km wide by the flightline length. The maximum flightline length is limited to approximately 240km.

The factory calibrations and IMU alignments for each sensor (Serial Numbers: 1321, 1413, 1420, 30012, 30017, 30022, 30034, and 30110) were tested and verified by in-situ test flights before the start of the project. The Leica ADS Flight Planning and Evaluation Software (FPES) is used to develop the flight acquisition plans. Flight acquisition sub blocks are designed first to define the GNSS base station logistics, and to break the project up into manageable acquisition units. The flight acquisition sub blocks are designed based on the specified acquisition season, native UTM zone of the DOQQs, flight line length limitations (to ensure sufficient performance of the IMU solution) as well as air traffic restrictions in the area. Once the sub blocks have been delineated they are brought into FPES for flight line design. The design parameters used in FPES will be 30% lateral overlap and 1.0m resolution. The flight lines have been designed with a north/south orientation. The design takes into account the latitude of the state, which affects line spacing due to convergence as well as the terrain. SRTM elevation data is used in the FPES design to ensure the 1m GSD is achieved over all types of terrain.

The raw data was downloaded from the sensors after each flight using Leica XPro software. The imagery was then georeferenced using the 200Hz GPS/INS data creating an exterior orientation for each scan line (x/y/z/o/p/k). Technicians precisely measured tie points in 3 bands/looks (Back/Nadir/Forward) for each line using Leica Xpro software. The resulting point data and exterior orientation data were used to perform a full bundle adjustment with ORIMA software. Blunders were removed, and additional tie points measured in weak areas to ensure a robust solution.

Once the point data was clean and point coverage was acceptable, photo-identifiable GPS-surveyed ground control points were introduced into the block adjustment. The bundle adjustment process produces revised exterior orientation data for the sensor with GPS/INS, datum, and sensor calibration errors modeled and removed. Using the revised exterior orientation from the bundle adjustment, orthorectified image strips were created with Xpro software and the April 2013 USGS 10m NED DEM.

The Xpro orthorectification software applies an atmospheric-BRDF radiometric correction to the imagery. This correction compensates for atmospheric absorption, solar illumination angle and bi-directional reflectance. The orthorectified strips were then overlaid with each other and the ground control to check accuracy. Once the accuracy of the orthorectified image strips were validated the strips were then imported into Inpho's OrthoVista 4.6 package which was used for the final radiometric balance, mosaic, and DOQQ sheet creation.