Metadata for Montana 2005 NAIP Orthophotos, 12-Kilometer Tiles Metadata for Montana 2005 NAIP Orthophotos, 12-Kilometer Tiles

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Identification Information:

Citation:

Originator: USDA-Farm Services Agency Aerial Photography Field Office

Publication date: 2006

Title: Montana 2005 NAIP Orthophotos, 12-Kilometer Tiles

Publication place: Helena, Montana
Publisher: Montana State Library

Online linkage: http://geoinfo.msl.mt.gov/data/Aerial_Photos/NAIP_2005

Larger Work Citation:

Title: Montana 2005 Color NAIP Orthophotos
Online linkage: http://mslapps.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={1d1e52f1-0cfa-47bb-9674-570cf5cfaa19}

Browse graphic file name: http://docs.msl.mt.gov/geoinfo/Images/Metadata/naip_2005.jpg
Browse graphic file description: Small sample showing image quality and resolution

Browse graphic file name: https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Individual/20050101_138_2005_Color_Dates.gif
Browse graphic file description: Map of Montana showing photography dates

Abstract:

These data are color digital aerial photos, taken in the year 2005. They consist of 2,703 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.

The data was originally 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. The State Library clipped and mosaiced the CCM data to form these tiles and converted them to State Plane coordinates.

An Esri shapefile showing the dates the images were collected is available at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2005_NAIP/naip_2005_color_dates.zip.

A shapefile showing the extents and names of the 12-kilometer tiles is at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2005_NAIP/naip_2005_tile_index.zip.

The compressed county mosaic form of the data are available for download and the uncompressed TIFF data are available on request. A false-color infrared version of the data is available. The data are available for use via web services. Please see http://geoinfo.msl.mt.gov/data/Aerial_Photos/NAIP_2005 for more information about these versions of the data.

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:

Beginning date: 07/01/2005
Ending date: 09/20/2005
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:

Completeness report:

There is an 18,000 acre area in Gallatin County east of Bozeman for which there is no data. There is a 16,000 acre area in T18N R7W in northern Lewis and Clark County that is covered by the wrong imagery. There are many areas along the International Boundary where the data stops approximately 100 meters south of the boundary.

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: 02/01/2006
Title: Aerial Photography
Source scale denominator: 40000
Calendar date: 2005

Process step:

Imagery was flown with Leica ADS40 digital sensors to capture 0.9m raw data. Raw data is then downloaded using Leica GPro software into 12 bit TIFF format. The raw TIFF imagery is then georeferenced and reprojected using GPS/INS 200Hz exterior orientation information (x/y/z/o/p/k) to allow stereo viewable imagery. This stereo viewable imagery is processed with the GPro/LPS automatic point matching algorithm to determine common match points every 2000 pixels across the imagery strip and 333 pixels along strip. This pattern includes dual rows of line ties to the adjacent line of imagery. The resulting point data is imported in Leica ORIMA and used to perform a full bundle adjustment of the imagery point data. 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 vertical control points from the prior generation MDOQQ's are introduced in the corners and center of the block being adjusted. This control is used to perform any datum shift (x/y/z and rotation) to ensure the new adjusted imagery fits the existing MDOQQ reference imagery. The output from this bundle adjustment process is 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 DEM. The 10m DEM is used where available and 30m DEM is used elsewhere. The orthorectified strips are overlaid over the existing MDOQQ compressed files to ensure accuracy is met by a visual inspection and manually measuring features. 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 4.0 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. The final DOQQ tiles are then organized into directories based on the USDA provided county lists. A visual inspection is performed of the entire county to ensure all tiles are present and the radiometric quality of the county looks good. If the radiometric quality is acceptable the county is compressed to MG3 format using Lizard Tech's GeoExpress v5.0 with a compression factor of 15 and 9 overview levels. Once this compression is complete manual reviewing is performed to ensure satisfactory results. The associated CCM shapefile is created using ESRI ArcView 9.0 with the latest service packs.


Process date: 02/01/2006

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: 03/2006

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: State Plane Coordinate System 1983

SPCS zone identifier: 2500

Lambert conformal conic: