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Metadata for Montana 2009 NAIP Orthophoto Metadata for Montana 2009 NAIP Orthophoto

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Identification Information:

Citation:

Originator:: U.S. Dept of Agriculture
Farm Services Agency
Aerial Photography Field Office
Publication date: 2009
Title: Montana 2009 NAIP Orthophoto

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

Abstract:

This data set contains imagery from the National Agriculture Imagery Program (NAIP). These data are digital aerial photos of the entire state of Montana, taken in the year 2009. The spatial resolution of the images is 1 meter.

The State Library provides the data through several avenues:

- Online viewing as either natural-color or false-color infrared images at http://montana.maps.arcgis.com/home/webmap/viewer.html?webmap=437353b569ea46319fb657e1c122b3d1

- A 4-band (infrared, red, green, blue) map service at https://gisservice.mt.gov/ArcGIS/rest/services/MSDI_Framework/NAIP_2009/ImageServer

- For download as natural-color compressed county mosaics in MrSID format at ftp://ftp.geoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2009_NAIP/UTM_County_Mosaics/. The state is covered by 62 images with a total size of 129 gigabytes.

- For download as natural-color compressed 12-kilometer tiles in MrSID format at http://mslapps.mt.gov/Geographic_Information/Data/Aerial_Photos/naip_2009_default.aspx. These images are in Montana State Plane coordinates, NAD1983, units meters. The state is covered by 2,732 images with a total size of 55 gigabytes.

- As 4-band GeoTIFF images. The state is covered by 11,797 images, each of about 170 megabytes. The images are in UTM coordinates, each of which covers a 3.75-minute quadrangle, or one-quarter of a USGS 7.5-minute topographic map quadrangle. To order GeoTIFF images from the State Library, select the quadrangles you want from the tiff index shapefile at ftp://ftp.geoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2009_NAIP/NAIP_2009_tiff_index.zip and send them to the Library, along with a storage device of sufficient size to hold them and return postage for the device.

An ESRI shapefile index showing the dates and times the images were acquired is available at ftp://ftp.geoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2009_NAIP/NAIP_2009_Dates.zip.

Time period of content:

Beginning date: 06/23/2009
Ending date: 09/02/2009
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:

Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: 406-444-4799
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
Beginning date: 06/23/2009
Ending date: 09/02/2009

Process step:

Imagery was flown with Leica ADS80 digital sensors to capture 1.0 meter 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

Spatial Reference Information:

Horizontal coordinate system definition:

Planar distance units: meters

Geodetic model: