Living Atlas

 

Choices:

  • Renderer
  • Time selection
  • Swipe
  • Mask
  • Change detection
  • Identify
  • Add data from ArcGIS online (requires account, not free)
  • Save to ArcGIS online (requires account, not free)
  • Export
  • Stories
  • App tutorial
  • About

 

 

https://livingatlas2.arcgis.com/eoexplorer/

https://livingatlas2.arcgis.com/landsatexplorer/ https://livingatlas2.arcgis.com/sentinel2explorer/
Landsat and Sentinel-2 Landsat only Sentinel-2 only

 

Landsat or Sentinel-2 Explorer

 
 

Find a place

  • You can type in a place name
  • You can enter lat, long, such as N22.62, E31.25.  If you do this, it will zoom in to a scale where you see basically a postage stamp.  You should back up until the image is not fuzzy, and perhaps a little farther to insure you are seeing the big picture of what is at that location.  If the coordinates have only two decimals like the ones here, they are only accurate to the nearest km.
 

Choose rendering

  • Agriculture (enhanced green which is actually NIR)
  • Natural color (plants not as obvious)
  • Color infrared (false color, with NIR shown in red, most common choice to show vegetation health)
  • Panchromatic (only on Landat, but has the best spatial resolution; Sentinel-2 has better spatial resolution in the principal bands without a pan band)
  • Vegetation index (NDVI): (NIR-red)/NIR + Red), where plants will be > 0.4 or so, and water will be very low

Time selector

  • Pick dates, cloud filter, or season
  • Click on the map and get a temporal profile graph

Time selector, Temporal Profile

  • This graph shows the time series, clearly showing when irrigation and crops arrived.
  • By clicking on the points, you can change the map display and see the change.

Mask

  • Pick Vegetation index (or other)
  • Set transparency,  so you can see the satellite imagery poking through
  • Adjust the mask value, so all the fields are colored, and not the surroundings
  • Get the area in the upper right of the control window

Swipe

  • Pick two dates
  • Move the slider back and forth


 

Change detection


  • Pick two dates
  • For more control, try the difference mask or threshhold mask

Identify

  • Scene information
  • Spectral profile, and comparison to common materials

Identify

  • Scatter plot, pick two bands

Export

  • Export creates a TIFF.  You want the current render (unless you intend to use the image in a GIS program), and it might only export the mask or overaly.
  • It might be easiest to use Snip or Print Screen, and then crop to what you want.
  • Export for Sentinel-2 requires ArcGIS Online account ($$$, or free limited public account)
  • Export removes the scalebar and location

 

 

Other directions, tutorials

 

Earth Observation Explorer

Explore imagery button

  • Rendering (try agriculture with DRA, or NDVI colorized)
  • Optional tools, try time series, spectral profiles
 
Export creates a TIFF.  You want as displayed (unless you intend to use the image in a GIS program), and it migt only export the mask or overaly.

It might be easiest to use Snip or Print Screen, and then crop to what you want.

 


Last revision 3/1/2021