The National Map Seamless Server
How To Use The National Map Seamless Server The National Map Seamless Server (http://seamless.usgs.gov) enables a user to view and download many geospatial data layers, such as National Elevation Dataset, National Land Cover Dataset, High Resolution Orthoimagery, and many more. This tutorial is designed to guide a user through the download process. Information about The National Map Seamless Server, Product Information, FAQ's, and homepage Links are accessible through the home page. Each page contains a HELP button that offers assistance and information for the corresponding page. Accessing Interactive Map Click on either 'View and Download United States Data' link or 'View and Download International Data' link.
The two interactive maps function the same, but start with the different views, as shown above. Note: If a map does not appear, check the Web Requirements and set the computer display settings screen resolution to 1280 X 1024. Using Interactive Map Locate Area of Interest 1. Use the Zoom buttons
Query and Other Tools
1. Query tools 2. Using the image above, starting from left to right, top to bottom: 3. The other tools 4. Using the image above, starting from left to right, top to bottom: Select Product to Download 1. Once the area of interest is decided, the next step is to select the product (s) to download.
Download Tools to Define Area 1. Download tools 2. The first button is Select By Rectangle. Click the button. There is a limit to the size of area that can be downloaded at a time. The type of product and the more products selected, the smaller the area that can be selected. The limit is reached when the outline box turns red. A message will display that the limit has been reached and to redefine the area. Below are two examples of size limits of products:
3. The second button is Single Feature Template. Click the button. Below the map a dropdown will appear. Select the desired template, may need to zoom in depending on the template selected. Using the mouse, click on the area of interest. This will clip the area using the selected template. The the processing page will start. 4. The third button is Multiple Feature Template. Click the button. Below the map a dropdown will appear. Select the desired template, may need to zoom in depending on the template selected. Using the mouse, click the areas of interest. More than one area may be selected. Click Submit. This will clip the areas using the selected template. The the processing page will start. 5. The fourth button is Define Area By Coordinates. Click the button. A popup will appear. Enter coordinates and click OK, then the processing page will start. 6. The processing page will compile the area and product selected, as well as calculate a size estimate for downloading. Once the processing page is complete, the The National Map Seamless Server Request Summary page will display the results. The National Map Seamless Server Request Summary Page
1. The National Map Seamless Server Request Summary page contains: Note: The National Map Seamless Server Request Summary page can be bookmarked to save and return to at a later time. Downloading 1.Click the download button from The National Map Seamless Server Request Summary list. Current Order Status page will appear,
providing messages of the progress of the extraction. A request is made to the product database to extract the defined area and product. The extraction progress is displayed in the popup window.
2. Once 'Raster Extraction Complete' is displayed, a SAVE option will appear. The random numbered zip file can be saved to the computer hard drive.
4. Unzip the file and it is ready to for use. |