ArcGIS Living Atlas

30 Years of Human-Related Change

In collaboration with Maxar Technologies, Esri provides ArcGIS users with access to the National Urban Change Indicator (NUCI) via ArcGIS Living Atlas of the World.  In short, NUCI is a conterminous United States index of persisted urban and human-related changes over time.  What does this mean?  How can I access it?  What can I do with it?  Great questions, let’s find out.

 

Persisted Changes

NUCI is product of Maxar’s Persistent Change Monitoring (PCM), an image-based change detection process that isolates changes that persist over time, and more specifically, urbanization and other human-related changes.  The NUCI database provides a history of change areas, represented as polygons, on an annual basis from 1987 through 2016.

With traditional image-to-image change detection methods, distinguishing among spurious, seasonal, and persisted changes can be difficult and time consuming.  With NUCI, all of the work has been done for you.  Over 13,000 multi-temporal Landsat images were analyzed, and the results filtered, enabling you to readily focus on thirty years of persistent land cover changes.

 

Landsat and NUCI synchronized time lapse showing urbanization of Las Vegas from 1987 through 2016.

 

Direct Visual Interpretation

NUCI is available in Living Atlas for visualization.  Change areas in this layer have been symbolized to show the year in which each change occurred.  Patterns and concentrations of change over time can be readily observed.  You can point and click on a change location of interest to get more information about that change.  Along with inherent attribution such as date of change, the NUCI database is also attributed with data elements extracted from co-registered geospatial data such as the National Land Cover Database (NLCD).

Click here to access the NUCI visualization layer.

Analysis Ready

NUCI is also available in the Living Atlas as a feature layer for use as input to analysis tools in ArcGIS Online and ArcGIS Pro.

Below are a couple basic examples using NUCI as input to the Summarize Within tool to gain insights on change over time.

Urbanization

NUCI in Las Vegas showing percent area of urban change from 1987 through 2016. Analysis performed using the 'Summarize Within' tool in Pro.

Deforestation

NUCI in a Northern California location showing percent area of deforestation, due to logging and fire activity, from 1987 through 2016. Analysis performed using the 'Summarize Within' tool in Pro.
Click here to access the NUCI analysis layer.

 

Combining NUCI with other ArcGIS tools and data can uncover even greater insights.  The Federal Emergency Management Agency (FEMA) uses NUCI in conjunction with data such as river flow and historic rain data to support tracking urban change and flood risk mapping.

 

Your Analysis

Try some of these Living Atlas search categories where you can find many authoritative layers to combine with NUCI in your analysis:

Boundaries

People

Environment

Infrastructure

 

 

About the author

Robert joined Esri in March 2017 and is currently working as Product Engineering Manager with a focus on Imagery in ArcGIS Living Atlas. He takes great pride in being a part of all that goes into providing Esri users with the rich online imagery content that the Living Atlas offers...content to complement and enhance Esri's industry leading geospatial platform...content to drive and support the Science of Where.

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