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Data Searching and Downloading

Data Searching and Downloading. EarthExplorer (EE). http://earthexplorer.usgs.gov Step 1 : Registration https://earthexplorer.usgs.gov/register / Username/password/Secret Question Affiliation and Primary Data Use Information Address – Contact and Shipping Registration Confirmation.

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Data Searching and Downloading

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  1. Data Searching and Downloading

  2. EarthExplorer (EE) http://earthexplorer.usgs.gov Step 1: Registration https://earthexplorer.usgs.gov/register/ • Username/password/Secret Question • Affiliation and Primary Data Use Information • Address – Contact and Shipping • Registration Confirmation

  3. EarthExplorer (EE) (cont.) Step 1: Search Criteria tab • Set Area of Interest: • path/row • look up a place name • enter coordinates • navigate in the map Step 2: Select date range can specify months if want certain time of year (dry season, wet season, etc.)

  4. EarthExplorer (EE) (cont.) Step 3: Select Landsat archive under ‘Data Sets’ tab specify which sensor (Landsat 4,5,7, 8 etc.)

  5. EarthExplorer (EE) (cont.) Step 4: Under ‘Additional Criteria’ you can specify the degree of cloud cover that is acceptable

  6. EarthExplorer (EE) (cont.) Step 5: Review Results • Select the image to view a thumbnail and obtain more information • Or view the footprint by selecting the foot icon Step 6: Download • Select the download button to add to your cart for download

  7. Landsat Data Files: What to Get? • Each Landsat scene has these files available to download*: • LandsatLook “Natural Color” Image (Full resolution .jpg file) • LandsatLook “Thermal” Image (Full resolution .jpg file) • LandsatLook “Quality” Image (L8 only, Full resolution .png file) • LandsatLook Images with Geographic Reference (.zip bundle) • at http://landsat.usgs.gov/LandsatLookImages.php • Level 1T GeoTIFF Data Product • Individual .TIFF band files, to use in GIS software • Geometrically corrected and generally don’t need to be georectified; should check first though • Must be stacked for use in ERDAS • New versions of ENVI will read mtl file and assign bands appropriately; no need to stack • All Landsat data are currently free of charge!!

  8. GloVis • http://glovis.usgs.gov • http://glovis.usgs.gov/?sensor=COMBINED&popout=TRUE • The map pops out separately – very useful with dual monitors and other open windows

  9. GloVis (cont.) • Browse-based viewer, easy to navigate to see many scenes • Uses USGS Registration credentials (same as EE) • Select Collection • Path/Row or Coordinates • Use direction arrows to move on map or click on map • Use Prev Scene and Next Scene to ‘page’ through scenes

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