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Introduction to Google Earth Engine
Developed by remote sensing specialists
at the USFS Geospatial Technology andApplications Center (GTAC), located in
Salt Lake City, Utah
Forest Service
United States Department of Agriculture
Agenda
Introduction to Earth Engine
Explore the Code Editor Platform
Show case available resources
Register for Earth Engine account
Forest Service
United States Department of Agriculture
What is Earth Engine?
1.Remote Sensing Archive with petabytes
of data in one location2.A cloud-based geospatial processing
platform for executing large-scale data analysis.Photo courtesy of Google Earth Outreach
Source: Google Earth Engine Slide
Forest Service
United States Department of Agriculture
Example Applications:
Classifying land cover conditions and change
detection:Video of deforestation in Brazil
https:// earthengine.google.com/timelapse /?location=rondoniaGlobal Forest Change Map,
Hansen et al
httpForest Service
United States Department of Agriculture
Why is it such a powerful
image analysis software?1.Public data catalog: vast amounts of
store data)2.Processing power (computation engine)
3.Interactive development platforms
4.Save and share work routines
Forest Service
United States Department of Agriculture
Data Catalog
MODIS250m daily
Landsat & Sentinel
10-30m, 14-day
Terra Bella
<1m dailyweeklyTerrain &
Land Cover
Weather & Climate
NOAA NCEP, OMI, ...
... and many more, updating daily! > 200 public datasets > 4000 new images every day > 5 million images > 5 petabytes of dataSource: Google Earth Engine Slide
Forest Service
United States Department of Agriculture
1. Earth Engine Public Data Catalog
Imagery
Geophysical
Climate & Weather
Demographic
Vector Data (Fusion Tables)
Image: Dave Thau
Forest Service
United States Department of Agriculture
1. Load your own data
Fusion Tables
Polygons in GEE come in Fusion Tables. These are
in a spreadsheet format but can contain geospatial information that can be viewed in GEEForest Service
United States Department of Agriculture
1. Make your own data in the map
You can also digitize vector data sets (e.g.,
polygons) in the map window.These records can then be converted to code to
use in your JavascriptscriptForest Service
United States Department of Agriculture
Why is it such a powerful
image analysis software?1.Public data catalog: vast amounts of
store data)2.Processing power (computation engine)
3.Interactive development platforms
4.Save and share work routines
Forest Service
United States Department of Agriculture
2. Computation Engine
distributed computation model,Forest Service
United States Department of Agriculture
2. Computation Engine
distributed computation model, a cloud-based processing infrastructure that automatically parallelizes analyses on many CPUs across many computersStorage Clusters (petabytes of data)
Forest Service
United States Department of Agriculture
2. Computation Engine
Storage Clusters (petabytes of data)
Forest Service
United States Department of Agriculture
2. Computation Engine
Unprecedented speed: reduce processing
times by orders of magnitude by using the distributed, cloud-based computing powerEase of use and lower costs: online
platform with easy access to data, scientific algorithms, computational power.Forest Service
United States Department of Agriculture
Why is it such a powerful
image analysis software?1.Public data catalog: vast amounts of
store data)2.Processing power (computation engine)
3.Interactive development platforms
4.Save and share work routines
Forest Service
United States Department of Agriculture
3. Two Platforms
Graphical User Interface (Explorer)
User friendly way to begin exploring and analyzing dataApplication Program Interface (Code Editor)
https://code.earthengine.google.com/ Powerful geospatial tool to create complex custom analysisRequires some programming knowledge
Supports both JavaScript and Python
Forest Service
United States Department of Agriculture
Explorer Platform
A point and click platform:
Audience: non-programmers
Basic analysis functionality
raster calculator),Neighborhood algorithms,
Terrain algorithms, etc
Save and share workspace
Explore and export data
Forest Service
United States Department of Agriculture
Explorer Platform
Cons:Limited analysis power:
subset of toolsForest Service
United States Department of Agriculture
Code Editor
What is it?
Web based IDE for the Earth Engine API
Access many pre-made geospatial tools
Forest Service
United States Department of Agriculture
Code Editor Interface
Forest Service
United States Department of Agriculture
Why is it such a powerful
image analysis software?1.Public data catalog: vast amounts of
store data)2.Processing power (computation engine)
3.Interactive development platforms
4.Save and share work routines (see demo)
Forest Service
United States Department of Agriculture
EE Benefits:
Good for projects that
requires:Data coverage for a large
regionExtensive data library
High speed, intensive
processing capacityAdvanced raster
processing toolsEE Limitations:
Better suited to image analyses than vector-based analysesAnalysis based on pixel spatial relations are harder to complete (because of the processing on multiple CPUS). Image segmentation and hydrologic modeling options are limited or in testing phases.