GSDA:Obtaining DOQs from The National Map on SDDS
From XMS Wiki - http://wikis.aquaveo.com/xms/
The USGS has a goal to provide high resolution (one pixel = 1/3 meter) ortho photos for most of the metropolitan areas of the U.S. Currently the list of available areas includes:
- Chicago, Illinois
- Baton Rouge, Louisiana
- El Paso, Texas
- Lexington, Kentucky
- Lincoln, Nebraska
- Mobile, Alabama
- Modesto, CA
- Seattle, WA
- Shreveport, Louisiana
- St. Louis, Missouri-Illinois
- Stockton, California
- Washington D.C.
The following steps will guide you in downloading an image for Lexington Kentucky
- Go to The National Map website at seamless.usgs.gov.
- Click on the link labeled View and Order Data Sets - United States Viewer
- Draw a zoom box Kentucky, as shown below:
- On the right-hand side of the page, toggle on the check box for displaying the High Res Ortho Index
- Scroll down and select the Refresh Map button
- Draw a zoom box around the light blue area that appears on the screen
- Zoom in on the area that is located roughly 1/3 from the top and in the middle of the blue area
- In the Visible Layers section, toggle on the check box to display High Res Ortho: Lexingtion, KY (you must scroll down a bit to see it)
- Select the Refresh Map button
- Zoom in around the race track
- Zoom in on the buildings located to the west of the track
- In the Download layers sections, toggle on the check box to download High Res Ortho data and toggle off the boxes for NED and NLCD
- Choose the Select with Rectangle tool located under the Download section.
- Draw a selection box around the buildings
- When the order is finished being processed, select the Download link for the Ortho image
- Save the file to your computer
The image is based in the UTM NAD 83 coordinate system with horizontal units in meters. Before you can view the image in an application, you need to decompress the downloaded file.
