The National Map Seamless Server, Earth Resources Observation and Science (EROS)
High Resolution Orthoimagery FAQ
Q. What is the High Resolution Orthoimagery ? A. The U.S. Geological Survey (USGS), along with the National Geospatial-Intelligence Agency (NGA), are acquiring high resolution orthoimagery for the major metropolitan areas, and state capitals of the United States. As an essential element of The National Map, http://nationalmap.gov, the need for up-to-date imagery is critical for Homeland Security and Emergency Response. The Orthoimagery category is one of the framework layers for The National Map. The imagery can be used as a base layer for updating or deriving additional geographic information, such as transportation networks, hydrographic features, elevation, and land cover. Q.What are the specifications of the High Resolution Orthoimagery ? A.
Q. What formats are available? A. TIFF is a GeoTiff (.tif and .tfw files included) Q. What is the coverage area? A. To see what areas are covered by High Resolution Orthoimagery:
Q. When will more High Resolution Orthoimagery data become available? A. We won't know which cities are being processed until they are delivered to EDC. Once the data arrives it is then loaded and placed on the seamless website. The best thing would be to check the "List of High Resolution Orthoimagery" within the "Products" drop down or the announcement section on the front page of http://seamless.usgs.gov about every month. Q. Why are some areas "View Only"? A. The areas listed as "VIEW ONLY" are under license restrictions agreements through the contractor or source of the data. Q. Can I get the images compressed? A. The images are only available as full resolution and not available as compressed files. Q. What is the resolution of the High Resolution Orthoimagery? A. The resolution for most of the areas is 0.3 meters. Some areas may have a different resolution. To find the resolution, check the "List of High Resolution Orthoimagery" within the "Products" drop down on the front page of http://seamless.usgs.gov about every month. |