Metadata for Montana 2023 NAIP Orthophotos Metadata for Montana 2023 NAIP Orthophotos

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Identification Information:

Citation:

Originator:: USDA-FPAC-BC Farm Production and Conservation Business Center
Publication date: 07/08/2022
Title: Montana 2023 NAIP Orthophotos
Online linkage: https://msl.mt.gov/geoinfo/data/Aerial_Photos/NAIP_2023

Abstract:

This dataset contains imagery from the National Agriculture Imagery Program (NAIP). These data are digital aerial photos of the state of Montana, taken in 2023. The NAIP acquires digital ortho imagery during the agricultural growing seasons in the continental U.S. A primary goal of the NAIP program is to enable availability of ortho imagery within one year of acquisition. The NAIP provides 60 centimeter ground sample distance (GSD) ortho imagery rectified to a horizontal accuracy within +/- 4 meters of reference digital ortho quarter quads (DOQQ's) from the National Digital Ortho Program (NDOP) or from the National Agriculture Imagery Program (NAIP). The tiling format of NAIP imagery is based on a 3.75' x 3.75' quarter quadrangle with a 300 pixel buffer on all four sides. The NAIP imagery is formatted to the UTM coordinate system using the North American Datum of 1983 (NAD83). The NAIP imagery may contain as much as 10% cloud cover per tile. This file was generated by compressing NAIP imagery that cover the county extent. Two types of compression may be used for NAIP imagery: MrSID and JPEG 2000. The target value for the compression ratio is 40:1 for imagery. The data are available from the State Library in two different formats. The most accessible format is a downloadable collection of compressed county mosaic (CCM) 4-Band MrSID images. NAIP 3.75 minute tile file names are based on the USGS quadrangle naming convention.

The FTP folder containing these images is https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2023_NAIP/UTM_County_Mosaics

The data are available from the State Library as a collection 10,505 4-band (near infrared, red, green, and blue) TIFF images in UTM coordinates. An ESRI shapefile index showing the extent and acquisition dates of the TIF images is available at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/Imagery/2023_NAIP/NAIP2023_TileIndex_shp.zip

To order TIFF images from the State Library, select the quadrangles you want from the tiff index shapefile and send them to the Library, along with a storage device of sufficient size to hold them and return postage for the device. More information on ordering can be found at the following website https://msl.mt.gov/geoinfo/data/Aerial_Photos/Ordering

Supplemental information:

The NAIP program is administered by USDA-FPAC-BC Farm Production and Conservation Business Center.

Time period of content:

Beginning date: 06/21/2023
Ending date: 11/17/2023
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-FPAC-BC Farm Production and Conservation Business Center
125 S. State St. Suite 6416
Salt Lake City, Utah 84138
Telephone: 801-844-2900
Fax: 801-956-3653
E-Mail: apfo.sales@slc.usda.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:: USDA-FPAC-BC Farm Production and Conservation Business Center
Publication date: 2023
Title: Aerial Photography
Beginning date: 06/21/2023
Ending date: 11/17/2023

Process step:

The ADS100 spectral ranges are; Red 619-651nm, Green 525-585nm, Blue 435-495nm and Near-infrared at 808-882nm.

Process step:

Digital imagery was collected at a nominal GSD of 15cm to 30cm using 6 Cessna 441's, 2 Reims-Cessna F406, 4 Piper PA31's, one Piper PAY2 and one Rockwell AC69 aircraft flying at an average flight height of 4470m to 8400m AGL. Aircraft flew with Leica Geosystem's ContentMapper digital sensors with firmware 6.01. Each sensor collected 4 image bands Red, Green, Blue and Near-infrared in an integrated frame image with an across-track field of view 67.1 degrees. The ContentMapper spectral ranges are; Red 580-660nm, Green 480-590nm, Blue 420-510nm and Near-infrared at 720-850nm. The BSI CMOS arrays have a pixel size of 3.76 microns and deliver an integrated frame image with 40000x8200 format. The CMOS arrays have a dynamic range of 83db and the A/D converters have a resolution of 14bits. The ContentMapper is a frame-based sensor the ground footprint of the imagery is approximately 6km wide x 1.23 km high at a nominal 15cm GSD or 12km wide x 1.23 km high at a nominal 30cm GSD. The maximum flightline length is limited to approximately 130km. The factory calibrations and IMU alignments for each sensor (Serial Numbers: Hx5001, Hx5002, Hx5003, Hx5004, Hx5005, Hx5006, Hx5007, Hx5008, Hx5009, Hx5010, Hx5011, Hx5012, Hx5014) were tested and verified by in-situ test flights before the start of the project. The Leica MissionPro Flight Planning Software 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 MissionPro for flight line design. The design parameters used in MissionPro will be 20% lateral overlap and 15cm to 30cm resolution. The flight lines have been designed with a north/south orientation or east/west where required for efficiency. 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 MissionPro design to ensure the 15cm to 30cm GSD is achieved over all types of terrain. The raw data was downloaded from the sensors after each flight using Leica HxMap software. The imagery was then georeferenced using the 500Hz GPS/INS data creating an exterior orientation for each frame image (x/y/z/o/p/k). Leica HxMap APM software was used to automatically generate tiepoint measurements between the frame images for each line and to tie all flight lines together. The resulting point data and exterior orientation data were used to perform a full bundle adjustment using HxMap Triangulation 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 frames were created with HxMap software and the 2018 or newer HxIP DEM. The HxMap 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 frames 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 the HxMap Mosaic software which was used for the final radiometric balance, mosaic, and DOQQ sheet creation. The final DOQQ sheets, with a 300m buffer and a ground pixel resolution of 60cm were then combined and compressed to create the county wide CCMs.