![]() It is available under three different licenses: Google Earth, a free version with limited functionality Google Earth Plus (discontinued), which included additional features and Google Earth Pro ($400 per year), which is intended for commercial use. It maps the Earth by the superimposition of images obtained from satellite imagery, aerial photography and GIS 3D globe. Google Earth is a virtual globe, map and geographic information program that was originally called Earth Viewer, and was created by Keyhole, Inc, a company acquired by Google in 2004. Over 16,000 images are freely available.Windows 2000, XP & Vista, Mac OS X, iPhone OS, Linuxġ0 MB (8.9 MB iPhone 24 MB Linux 35 MB Mac ) This dataset was selected and generated through NASA’s Commercial Remote Sensing Program, as part of a cooperative effort between NASA and the commercial remote sensing community to provide users with access to quality-screened, high-resolution satellite images with global coverage over the Earth’s land masses. The USGS also freely offers the Landsat Orthorectified data collection which consists of a global set of high-quality, relatively cloud-free orthorectified MSS, TM and ETM+ imagery from Landsats 1-5 and 7. ![]() The WELD products are processed so that users do not need to apply the equations and spectral calibration coefficients and solar information to convert the ETM+ digital numbers to reflectance and brightness temperature, and successive products are defined in the same coordinate system and align precisely, making them simple to use for multi-temporal applications. ![]() These data are freely available as as custom GeoTIFF subsets via a new interactive web ordering system and as tiled HDF products via FTP. The NASA funded Web-enabled Landsat Data (WELD) project is systematically generating 30 meter composited Landsat Enhanced Thematic Mapper Plus (ETM+) wall-to-wall mosaics of the conterminous United States and Alaska from 2005 to 2012 on a weekly, monthly, seasonal and annual basis. + Earth Observatory’s Quick Guide to Earth Explorer for Landsat 8 “Landsat 4-5 TM”, “Landsat 7 ETM+”, “Landsat Orthorectified ETM+”) and then select parameters such as acceptable cloud-cover percentages and the range of desired acquisition dates. Additionally, you also have the option to choose your data set (e.g. After entering the website (you must create a login), you can either search for data by selecting a region on a map, by entering coordinates, or by entering a place name. The USGS Earth Explorer website allows you to custom tailor your search parameters for Landsat data. All data is now orthorectified and in GeoTIFF format. ![]() You can use the “Add” and “Order” buttons at the lower left corner of the viewer to order data, or if a read “Downloadable” label appears on the image, you can download the data immediately. Use the menu at the top of the view window to view data from different sensors, to change the browse image resolution, or to view map layers. This allows you to visually locate the best Landsat image for your purposes. After clicking on the map or entering coordinates, the GloVis view window will appear on your screen showing you nine adjacent Landsat 7 browse images. ![]() On GloVis, you can search for data by clicking on an interactive map or by entering the geographic coordinates (latitude and longitude) of the site you are searching for. USGS GloVis: The Global Visualization Viewer Be sure to check out the 40 years of data over your favorite place! Whether you are preparing a presentation, teaching kids, educating decision makers, or previewing the full-resolution image prior to downloading the full scenes, the LandsatLook Viewer is a new and exciting way to experience the Landsat archive. With a place name search tool or panning and zooming, you can easily navigate the globe. USGS has made exporting your display and downloading full scenes easy, but the real power of the LandsatLook Viewer is the capability to explore Earth. On July 23, 2012, on the 40th Anniversary of the launch of Landsat 1, the USGS Landsat Project rolled out a new tool that enables fast and easy viewing of 3 million Landsat images all around the globe with just a simple web browser. The descriptions below will help you decide which site is best for you. All Landsat data are available from USGS for free. Landsat data can be freely ordered from three USGS websites. ![]()
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