Metadata for Montana 2009 NAIP Orthophotos, 12-Kilometer Tiles Metadata for Montana 2009 NAIP Orthophotos, 12-Kilometer Tiles

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Identification Information:

Citation:

Originator: USDA-Farm Services Agency Aerial Photography Field Office

Publication date: 2009

Title: Montana 2009 NAIP Orthophotos, 12-Kilometer Tiles

Publication place: Helena, Montana
Publisher: Montana State Library

Online linkage: http://geoinfo.msl.mt.gov/data/Aerial_Photos/NAIP_2009

Larger Work Citation:

Title: Montana 2009 NAIP Orthophotos
Online linkage: http://mslapps.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={a90a6048-c5b1-4c57-9361-aa1829c816bf}

Browse graphic file name: https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Individual/20090301_687_NAIP_2009_dates.gif
Browse graphic file description: Map showing aerial photography dates

Abstract:

These data are color digital aerial photos, taken in the year 2009. They consist of 2,733 12x12-kilometer tiles that cover the entire state of Montana. They are orthorectified natural-color MrSID images with a ground resolution of 1 meter, and they are registered to the Montana State Plane coordinate system, NAD83, units meters.

An ESRI shapefile showing the dates the images were collected is available at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2009_NAIP/naip_2009_dates.zip and a shapefile showing the extents and names of the 12-kilometer tiles is at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2009_NAIP/naip_2009_tile_index.zip.

The imagery are also available via a web service at https://gisservicemt.gov/arcgis/rest/services/MSDI_Framework/NAIP_2009/ImageServer.

The data were provided by the U.S. Farm Services Agency National Agricultural Imagery Program (http://www.apfo.usda.gov) as Compressed County Mosaics (CCMs) in UTM coordinates. These mosaics are available at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2009_NAIP/UTM_County_Mosaics/. The State Library clipped and mosaiced the CCM data to form these tiles and converted them to State Plane coordinates. The uncompressed TIFF images that the data were derived from are available from the State Library on request. Each of the 11,793 TIFF images covers a quarter of a USGS 7.5 minute quadrangle and is about 170 megabytes in size.

Purpose:

These aerial photographs were captured to support various governmental, municipal, tribal, and emergency management Geographic Information System activities. Orthorectified aerial photographs can be used to determine the geographic location of objects visible on the photos.

The original imagery was acquired to meet USDA program requirements including conservation planning and soil survey.

Time period of content:

Calendar date: 2009
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.

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:

Farm Services Agency Digital Orthophoto Specifications. The specified accuracy for 1-meter imagery such as this is 5 meters.

Lineage:

Source information:

Originator: Aerial Photography Field Office
Publication date: 10/2009
Title: Aerial Photography
Source scale denominator: 40000
Calendar date: 2009

Process step:

Imagery was flown with Leica ADS80 digital sensors to capture 1.0m raw data. Raw data is then downloaded using Leica XPro software. The raw imagery is then georeferenced using GPS/INS 200Hz exterior orientation information (x/y/z/o/p/k). Technicians precisely measure tie points in 3 bands/looks (Back/Nadir/Forward) for each line using Leica Xpro software. The resulting point data and exterior orientation data is used to perform a full bundle adjustment using Xpro. Any blunders are removed, and weak areas are manually supplemented to ensure good coverage of points.

Once the point data is cleaned and point coverage is acceptable photo-identifiable GPS-surveyed ground control points are introduced in the corners and center of the block being adjusted. The output from this bundle adjustment process is the revised exterior orientation data for the sensor with any GPS/INS, datum, and sensor calibration errors modeled and compensated for. Using this revised EO data orthorectified image strips are created using the USGS NED DEM. The orthorectified strips are overlaid with each other and with the ground control to check accuracy.

Once the accuracy of the orthorectified image strips are validated the strips are processed with a NWG proprietary dodging package that compensates for the bi-directional reflectance function that is caused by the sun's position relative to the image area. This compensated imagery is then imported into Inpho's OrthoVista 4.4 package which is used for the final radiometric balance, mosaic, and DOQQ sheet creation. These final DOQQ sheets contain a 300m minimum buffer. These final DOQQ tiles are edge inspected to the existing MDOQQ sheets for accuracy validation.


Process date: 09/29/2009

Process step:

A 12x12-kilometer tile system was set up for Montana, and a VBA macro was written for the ESRI ArcMap program that compared the extent of each tile with the extent of imagery in the compressed county mosaics (CCMs) provided by the Aerial Photography Field Office. This macro produces an XML file formatted to be loaded as projects by GeoExpress, a software package produced by Lizard Tech (http://www.lizardtech.com) that manipulates image data and produces MrSID image. The GeoExpress project converts data from images of the appropriate county or counties that cover each tile to State Plane Coordinates and clips the data to the extent of the tile. After this process is completed for a group of tiles, the tiles are then converted from MG3 format to MG2.


Process date: 12/2009

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: State Plane Coordinate System 1983

SPCS zone identifier: 2500

Lambert conformal conic: