Metadata for Montana 2005 NAIP Orthophotos, Compressed County Mosaics Metadata for Montana 2005 NAIP Orthophotos, Compressed County Mosaics

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Identification Information:

Citation:

Originator: USDA-Farm Services Agency Aerial Photography Field Office

Publication date: 2006

Title: Montana 2005 NAIP Orthophotos, Compressed County Mosaics

Publication place: Helena, MT
Publisher: Montana State Library

Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2005_NAIP/UTM_County_Mosaics

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

Browse graphic file name: http://docs.msl.mt.gov/geoinfo/Images/Metadata/naip_ccm_1.jpg
Browse graphic file description: Sample showing overlap of no-data areas with adjacent county mosaics

Browse graphic file name: http://docs.msl.mt.gov/geoinfo/Images/Metadata/naip_ccm_2.jpg
Browse graphic file description: Sample showing seamlines between adjacent county mosaics after black pixels have been rendered transparent

Abstract:

These data are compressed county or half-county mosaics of digital, natural-color aerial photographs of Montana taken during the year 2005. The imagery has a 1 meter ground sample distance and are orthorectified to National Mapping Standards at the 1:24,000 scale. The imagery is formatted to the UTM coordinate system using NAD83. The files were generated by compressing quarter quadrangle tiles that cover a county or half of a county to one fifteenth of their storage size with MrSID software.

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

Each county mosaic is several gigabytes in size and contains large no-data areas for regions inside each county's bounding rectangle but outside the county boundary. The data are also available as non-overlapping 12-kilometer tiles and as a web service. A false color infrared version of the data is available. Please see http://geoinfo.msl.mt.gov/data/Aerial_Photos/NAIP_2005 for access to these alternate forms of the data.

Purpose:

These data sets contains digital ortho-imagery developed to support planning and delivery of USDA programs. The USDA field service centers use digital ortho imagery as a basic reference for conservation plans and soil survey.

Time period of content:

Beginning date: 07/01/2005
Ending date: 09/20/2005
Currentness reference: ground condition

Access constraints: None

Use constraints:

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:

USDA-Farm Services Agency Aerial Photography Field Office
2222 West 2300 South
Salt Lake City, Utah 84119-2020
Telephone: 800-973-3500
Fax: 801-975-3529

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 Specs. 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
Source contribution: Mosaicked County Image
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

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: Universal Transverse Mercator

UTM zone number: 11, 12, or 13

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: 298.257

Distribution Information:

Distributor:

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

Resource description: Downloadable Data

Distribution liability:

Standard order process:

Digital form:

Metadata Reference Information:

Metadata date: 03/08/2016

Metadata contact:

USDA-Farm Services Agency Aerial Photography Field Office
2222 West 2300 South
Salt Lake City, Utah 84119-2020
Telephone: 801-975-3500