-------- Original Message -------- Subject: Re: Fw: DOQQ's Date: Thu, 6 Dec 2007 19:46:47 -0800 From: Matt Fox <[log in to unmask]> To: Maps, Air Photo & Geospatial Systems Forum <[log in to unmask]> By the way, here is a nice little addon for Google Earth that will overlays all of the DOQs from USGS onto Google Earth. As a bonus, you also get their DRG layer. http://www.gelib.fox-fam.com/wp-content/uploads/2007/04/doqdrg.kml Matt On Dec 6, 2007 6:36 AM, Maps-L <[log in to unmask]> wrote: > forwarded usgs ... > -------- Original Message -------- > Subject: Fw: DOQQ's > Date: Wed, 5 Dec 2007 17:42:39 -0500 > From: John C Fouke <[log in to unmask]> > To: maps-l > > > > I received an interesting inquiry recently that asked "Is there any place > in the US (lower 48 and Hawaii) that does not have 1:12,000 scale DOQQ's > available?". Below is the answer that Steve Reiter at the USGS Denver > SILS put together: > > > Greetings: I just spoke with Dan Daniels - he's our Orthoimagery > Manager. Dan said all of the lower 48 states should be available as DOQ > quarter-quads. There may some locations that are blacked out or reduced > in resolution due to security concerns. The USGS seamless website offers > up this imagery for free download (see the attached word document > "Seamless.doc"). For unknown reasons, there's been a gap in coverage in > the northwestern part of Maine, but Dan says this area will soon be > downloadable as well. > > I checked the USGS EarthExplorer website ( > http://edcsns17.cr.usgs.gov/EarthExplorer/) for DOQ coverage of Hawaii & > Alaska. This website serves as our sales database, so it should be an > accurate reflection of available coverage. Unfortunately, the results > are reported as text, not as a pictorial image. There are 271 > quarter-quads available for Hawaii. There are 581 quarter-quads available > for Alaska. I believe there are gaps in the Hawaii coverage and I'm > certain there are gaps in Alaska coverage. > > John Fouke > > text instead of attachment: > > > > > *http://seamless.usgs.gov* > > The USGS seamless website offers free digital data suitable for import > into a Geographic Information System (GIS). If you don't have a > reasonably fast Internet connection, you'll probably find this to be a > frustrating experience. If you are using Windows XP and have Service > Pack 2 installed, you'll want to look at the first > Frequently-Asked-Question from the dropdown menu – it details how to > configure Windows XP so downloads from the seamless website are > permitted. It's a good idea to read all of the FAQs before proceeding. > > You may download United States data as well as world data – choose the > appropriate panel. A new screen appears with tools on the left, a map > interface in the center, and layer information on the right. By default, > the zoom-in tool is active, so with each click, you'll see more detail > and features like roads, political boundaries, and place names will > begin to appear. By default, the "layer" tab is active on the right. You > may turn layers on & off under the layer tab to help you identify your > area-of-interest (AOI); notice each layer can be expanded & contracted > by clicking on the arrow. > > Once zoomed to a sufficient resolution that displays your AOI, click the > "download" tab on the right. By default, the 1-second NED layer is > checked, meaning that's the layer you wish to download. If appropriate, > uncheck that layer & choose another. Note you may check several layers > for download. Data availability is not uniform: some areas will have > layers that are not available at other geographic locations and vice-versa. > > Once the appropriate layer(s) is selected, you need to define a download > area. On the left, the "Downloads" grouping of tools offers several > options. For most users, the "Define Download Area" and the "Define Area > by Coordinates" tool is appropriate; the first allows you to drag a box > – a green box is permissible, a red box exceeds the file size capacity. > > From here, the process is straightforward. Data will be served up as > zipped files for transfer. Some data is available in several different > formats; to change the default format, click "Modify Data Request" on > the SDDS Request Summary Page. If you request a large block of data, > layers may be parsed into a number of smaller files to download. > > Some users have expressed a preference for the Internet browser > > "Mozilla Firefox" when using the Seamless website. The browser is > available here: > > http://www.mozilla.com/en-US/firefox/ > > This is provided for informational purposes only and does not constitute > endorsement by the US Geological Survey. > >