Catégorie : Non classé

SH

Sentinel-Hub
https://apps.sentinel-hub.com/sentinel-playground/
https://apps.sentinel-hub.com/eo-browser/

Sentinel and Landsat are satellite missions designed to monitor environmental changes with very high resolutions.
Sentinel-Hub is a tool for visualizing archives as well as the most recent imagery retrieved by both missions. Those include visible and radar imageries, plus derived data like vegetation and moisture indices.

+ With the cloud filter, select only the cloud-free scenes

– No polar projection to focus on Arctic or Antarctica views

– No global ocean coverage 

Characteristics
Type: satellite imagery + derived data 
Spatial resolution: various (e.g. Sentinel-2 (S-2):10-m) 
Spatial coverage: various (S-2: app. 5 days) 
Time resolution: various (global land for S-2) 
Time coverage: various (e.g. S-2: 2015-present ;  Landsat-5: 1984-2013)
Temperature extreme maps

This webpage produces animations showing which meteorological stations are recording extreme cold or hot temperature values.

http://coolwx.com/record/

+ Near-real-time

+ Emphasize the difference between weather and climate

+ Animations summarizing record maps for the last 12 months

– Be careful with interpretations of isolated measurements!

Characteristics
Type: ground measurements of surface air temperature
Spatial resolution: point (in-situ)
Spatial coverage: global
Time resolution: hourly 
Time coverage:12 last months

GEE

Google Earth Engine Time Lapse
https://earthengine.google.com/timelapse/

How is Earth changing? The timelapse proposed by Google Earth Engine offers a global view of surface changes since 1984, thanks to Landsat and Sentinel satellite imageries.

+ Cloudless view of Earth changes since 1984

+ Very high resolution satellite imagery

+ Very easy to use

– Regions with very low time resolution and quality (cloudy regions)

– Mercator projection (North and South poles distorted)

Characteristics
Type: satellite imagery 
Spatial resolution: approx. 30 m
Spatial coverage: global 
Time coverage: 1984-2016

ENS

Earth nullschool
https://earth.nullschool.net/

Interactive visualization globe displaying weather forecasts (temperature, pressure, windspeed, etc. for several altitudes), atmospheric pollution (CO, CO2, SO2, fine and coarse particulate matter for different chemical types), ocean conditions (sea surface temperature (SST), SST anomalies, ocean current speed etc.), polar aurorae.

+ One of our favorites

+ Intuitive and esthetic interface

+ Many various datasets (oceanography, meteorology, air pollution)

+ Available in many different languages

Characteristics
Type: measurements/reanalyses/forecasts  
Spatial resolution: various 
Spatial coverage: global
Time resolution: 3-h 
Time coverage: 2013-present

EN

Earth Now
https://climate.nasa.gov/earth-now/

Interactive visualization of satellite data on a 3-D globe (atmospheric composition, visible imagery, air temperature, sea level, etc.).

+ Very easy to use

+ Provide a 3D view of satellite imagery

+ Real-time tracking of satellites positions

+ Focus on on-going environmental events (wildfires, hurricanes…)

– Few archives, so climatic trends are not emphasized

Characteristics
Type: satellite imagery + measurements
Spatial resolution: various
Spatial coverage: global
Time resolution: various
Time coverage: various

NEO

NASA Earth Observations
https://neo.sci.gsfc.nasa.gov/

Interactive visualization of different environmental characteristics on global maps.

+ Quite easy to use

+ Lots of data linked to the so-called « Essential Climate Variables »

+ Scientific explanations provided with 3 different degrees of complexity

– Near-real-time data not always available

Characteristics
Type: measurements 
Spatial resolution: variable (e.g. 500-m for Terra/MODIS imagery)  
Spatial coverage: global
Time resolution: various
Time coverage: various

BT

Blue Turn

What does Earth look like from a Sun’s perspective? Blue Turn uses the imagery from a unique satellite : DSCOVR. DSCOVR is the only satellite that is continuously watching the sunlit hemisphere of the Earth. What’s the point? It can film the rotation of the Earth on its axis!

http://app.blueturn.earth/

Blue Turn produces time interpolations to fulfill gaps between the satellite images. So the Earth spins smoothly…

+ Near real-time imagery of Earth’s rotation

+ Very easy to use

– Does not work on all browsers we tested

Characteristics
Type: satellite imagery 
Spatial resolution: approx. 10 km 
Spatial coverage: sunlit hemisphere of the Earth 
Time resolution: continuous (interpolation from approx. hourly resolution) 
Time coverage: 2015-present
Worldview
https://worldview.earthdata.nasa.gov/

Worldview is a NASA near-real-time atlas of satellite data. It can be used to visualize imagery from Terra, Aqua, Suomi-NPP satellites, and many variables derived from imagery (sea surface temperature maps, wildfire detection, etc.)

Characteristics
Type: satellite imagery + derived data 
Spatial resolution: variable (e.g. 500-m for Terra/MODIS imagery)  
Spatial coverage: global
Time resolution: daily 
Time coverage: variable (e.g. Terra/MODIS: 2000-present)