DTM Consulting, Inc. 20060316 remote-sensing image Helena, Montana Montana State Library https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Yellowstone_River_Clearinghouse/Imagery/1950 http://mslapps.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={4691733a-ab8a-11e3-9be7-425861b86ab6} Aerial photo mosaics of the Yellowstone River corridor. Images may be a mix of years from 1948 to 1951, in MrSID format. These images range in size from 2 to 43 megabytes. These images were georeferenced to 1995 U.S. Geological Survey Digital Orthophoto Quadrangles. Positional accuracy was targeted on the river corridor. Little effort was made to reference the upland areas in regions of high relief. In general, there is one image for each county, from Sweet Grass, Montana, to McKenzie, North Dakota. Yellowstone County is divided into 2 images. Some older GIS applications may need .sdw files to accompany these files for georeferencing information. ESRI's ArcMap needs .aux files to read the coordinate system of the images from. These files may be accessed at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Yellowstone_River_Clearinghouse/Imagery/1950/aux_and_sdw.zip. The cell size of the images varies from 1 to 2.5 meters: McKenzie - 1.879 Richland - 1.823 Dawson - 2.394 Prairie - 1.882 Custer - 2.462 Rosebud - 1.853 Treasure - 1.790 Yellowstone - 1.000 Stillwater - 1.000 Sweet Grass - 1.000 Developed as part of the Yellowstone River Cummulative Effects Study. Imagery is intended for reach level analysis of changes in the Yellowstone River Corridor. 1948 1951 ground condition Complete -110.25 -103.92 48.01 45.54 ISO 19115 Topic Category imageryBaseMapsEarthCover Historic Imagery Yellowstone River Montana 1950 Yellowstone River Montana North Dakota None 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. Jim Robinson Montana DNRC mailing address

P.O. Box 201601

Helena Montana 59620-1601 406-444-4247 jrobinson@mt.gov Prepared by DTM Consulting, Inc., Bozeman, MT. Individual images were georeferenced to 1995 DOQs at a scale of approximately 1:6,000. Number of registration points varied depending on the ammount of distortion in the original photograph. Positional accuracy targeted the river corridor. Little effort was made to reference the upland areas in regions of high relief. U.S. Geological Survey Sioux Falls, SD U.S. Geological Survey Earth Resources Observation Systems (EROS) Data Center http://edc.usgs.gov/products/aerial.html 1948 1951 ground condition This is the source of the images for Sweet Grass, Stillwater, and western Yellowstone counties. The EROS Data Center has archived thousands of rolls of film containing several million frames of historical aerial and satellite photographs dating back to the 1930's gathered from various Federal agencies. This archive includes the rather well known, often utilized NHAP and NAPP film, but the largest portion of this archive consists of original film acquired in support of the USGS 1:24,000 topographic quadrangle map series, taken during the 1940s through the 1970s. Most of this photography is reasonably large scale to support the production of the quadrangle maps. USGS EROS has implemented a medium-resolution digital product. The medium-resolution files are created at approximately 600 dpi with an output image size of around five inches square. U.S. National Archives and Records Administration (NARA) Washington, DC U.S. National Archives and Records Administration (NARA) http://www.archives.gov/research/formats/cartographic.html 1948 1951 ground condition This is the source of the images for Treasure, Rosebud, Custer, Prairie, Dawson, Richland, McKenzie, and eastern Yellowstone counties. Original scans were recieved by DTM Consulting from the U.S. Army Corps of Engineers on two different external hard drives. ENVI was used to georeference individual images to match 1995 DOQs. Control points focused on the river corridor. When the georeferencing closely matched unchaged areas in the DOQs, the image was rectified and saved as a new TIF image with referencing information. Edge matching between overlapping images was performed so that the 'top' image represented the best georeferencing. All images each county were mosiaced into a single TIF image, or into 2 images for Yellowstone County, using ENVI. 2005 DTM Consulting, Inc. Tony Thatcher 406-585-5322 tony@dtmgis.com The mosaic images provided by DTM Consulting to the State Library were converted to MrSID format. 20060315 State Plane Coordinate System 2500 45.000000 49.000000 -109.500000 44.250000 600000.000000 0.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Montana State Library mailing address

PO Box 201800

Helena MT 59620-1800 406-444-5354 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov geoinfo@mt.gov Downloadable Data 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. MrSID https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Yellowstone_River_Clearinghouse/Imagery/1950 20140106 20130417 20060417 Montana State Library mailing address

PO Box 201800

Helena Montana 59620-1800 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 {9DAC0EC0-5027-41DD-BCBC-89673BB69225}