Aerial Photography and Imagery Resources Guide
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1 Aerial Photography and Imagery Resources Guide Cheyenne and Laramie County Cooperative GIS Created and Maintained by the GIS Coordinator for the Cooperative GIS Program March 2011
2 CHEYENNE / LARAMIE COUNTY COOPERATIVE GIS This reference guide contains a list of imagery resources used by the members of the Cooperative Geographic Information System. Members with access to the local GIS network are able to view these files in their GIS projects. Not all files are available to the public and are stated as such. The current prices for aerial photography purchased by the GIS Program members are listed at our Data Pricing and Map Purchases web page. There are many sources for aerial photography and this resource guide is specific to what is provided to the members. Questions regarding this list may be directed to the Cooperative GIS Coordinator at (307) or itd@laramiecounty.com. It is important to note the history of these resources as they compare to the vector datasets maintained by the GIS Cooperative members. Our members have strived to ensure the GIS data sets and the imagery files are as useful and accurate as possible. When the end user displays these together there may be apparent differences between the two. Although consistency and continuity between all datasets is one of our goals, there are technical details that need to be described to explain why there may be geographic areas with apparent inconsistencies. This being said the following technical details become important to note: 1) The imagery resources prior to 2005 are used for reference only, for time stamping, or change detection purposes. During the GIS data conversion from NAD27 to NAD83 the vector data was enhanced and improved to more accurately represent their place on the earth. A similar process was not applied to these archived imagery files. 2) There are normal and ordinary development changes that occur to the landscape (i.e., changes to streets, etc.) over time. If this type of change occurred after the latest aerial photography collection date, the imagery will not match the new and updated vector data. There is an inherent disconnect between the imagery and the vector data. Processes are in place to provide the latest imagery available to our end users in a timely manner. 309 W 20 TH ST, SUITE 1200 CHEYENNE WY PH: (307) FAX: (307)
3 CHEYENNE / LARAMIE COUNTY COOPERATIVE GIS What are the benefits of aerial photography and how can I use different types of imagery? Photos are necessary 1) to identify expanded residential and commercial development, 2) to review development features prior to field checking, 3) for planning of proposed development areas, 4) to identify additional school site development, 5) for change detection, 6) for producing professional looking maps and displays with current background imagery, 7) to display landscape and topography changes, 8) transportation planning, and 9) emergency management and planning. The high resolution photography is also used as a source for verifying the relative accuracy of the GIS datasets used by the Cooperative. Feature comparisons are often made between data and photography to identify differences and to plan for additional data collection in the field. It is the Cooperative s ultimate goal to make the imagery available for viewing by the public and in-house within future Cooperative web applications. The aerial photography needs to be current and relevant when compared to the GIS vector data layers. The older the imagery, the more questions arise about data accuracy. What is more correct the vector data or the imagery? For urban areas such as Cheyenne, the resolution needs to be high enough to allow our GIS users to zoom in and view features clearly. The visualization of features on the earth enhances the functionality of the entire GIS Program data holdings. The time of year the imagery is collected is important when deciding what types of features need to be visible. Features that can be easily identified in 1-foot resolution imagery may include: streets, parks and recreation features, buildings, parking lots, and drainages. Features that can be easily identified in 6-inch resolution imagery may include: manholes, landscaped area, greenway paths and sidewalks, fence lines, utility poles and power lines, road surface types, traffic signals, and street markings.
4 Below are two samples of varying resolutions at a scale of 1: inch (May 2010) 1-foot (May 2010)
5 Below are samples of varying resolutions at a scale of 1: inch (May 2010) 2-foot (July 2005)
6 1-meter (August 2009) 6-inch Infrared (May 2010)
7 2010 Natural True color and CIR 6-inch for Cheyenne and surrounding Laramie County, including Burns and Pine Bluffs (500sq.mi.) 1-foot for all of Laramie County Coverage Area City of Cheyenne and Laramie County Date(s) Flown May 2010 Produced by Sanborn Map Project Manager GIS Cooperative Available to the public for purchase 6-inch: ¼ section tiles in.tif format with average size of 105MB. MrSID mosaic of Greater Cheyenne Area. 1-foot: 10,000 meter tiles in.tif format with average size of 391MB.
8 2009 Natural True color 1 meter Coverage Area State of Wyoming Date(s) Flown Summer/Fall 2009 Produced by USDA/FSA for NAIP Available to the public through USDA/FSA:
9 2008 Natural True color.30 meter (approx. 1 foot) Coverage Area Urban Area of Cheyenne, Laramie County Date(s) Flown June 2008 Produced by USGS/NGA Available to the public through The National Map Seamless Server:
10 2006 Natural True color 1-meter Coverage Area State of Wyoming Date(s) Flown Summer/Fall 2006 Produced by USDA/FSA for NAIP Available to the public through USDA/FSA:
11 2005 Natural Coverage Area Date(s) Flown Produced by Project Manager True color 6-inch for Cheyenne and surrounding Laramie County (179sq.mi.) Topographic data collected. 2-foot for portions of Laramie County (448sq.mi.) City of Cheyenne and portions of Laramie County May 2005 (6-inch) and July 2005 (2-foot) Sanborn Map GIS Cooperative Imagery available to the public through The National Map Seamless Server: Topographic data available through City of Cheyenne Engineering Department.
12 2004 Natural True color 2-meter Coverage Area State of Wyoming Date(s) Flown Summer/Fall 2004 Produced by USDA/FSA for NAIP Available to the public through USDA/FSA:
13 2002 USGS CIR Digital Orthophoto Quads Infrared 1-meter Coverage Area Laramie County Date(s) Flown July 2001 Produced By Sanborn Map, L.L.C. Project Manager Wyoming State Engineers Office Available to the public through Wyoming Geographic Information Science Center: or USGS:
14 2001 Satellite satellite 1-meter Coverage Area Portions of Laramie County Date(s) Flown July 2001 Produced By Space Imaging / Mine Engineering Project Manager GIS Cooperative Not available to the public
15 2000 True color.5 meter (approx. 1.5 foot) Coverage Area Greater Cheyenne Area Date(s) Flown October 2000 Produced By Space Imaging Project Manager GIS Cooperative 28 panels ranging in size from 16MB to 110MB Not available to the public.
16 1994 USGS Digital Orthophoto Quads Black and white 1-meter Coverage Area Laramie County Date(s) Flown 1994 Produced By USGS Project Manager Wyoming State Engineers Office Available to the public through Wyoming Geographic Information Science Center: or USGS:
17 1969 Black and White Black and white Unknown (georeferenced.jpg photos) Coverage Area Downtown Cheyenne Date(s) Flown 1969 Produced By City of Cheyenne Engineering Not available to the public
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