3D Geovisualization

Assignment

 

 

Britta Ricker, PhD

M-GEO Extract/Analysis and Dissemination GeoData

ITC

Objectives of this assignment

 

 

  • Design and develop a 3D geovisualization of Tegucigalpa to identify and communicate areas of land use change or areas of potential hazards/disasters
  • Design and develop an animation using ArcGIS Pro 

  • Implement design principles learned in lecture

  • Build upon knowledge and data from previous assignments 

Today in Class

  1. GIS & Remote Sensing 
  2. Color Composites
  3. 3D Geovizualition 
  4. Walk through:
    1. ArcGIS Online
    2. ArcScene
    3. ArcGIS Pro

Disaster and Land Use

Maps can help reduce complexity

Vanacker (2016) Impact of deforestation on slope stability

 

Geographic Information
Science

Geographic Information Systems(GIS)

Geographic Information Systems (GIS)

Tegucigalpa

Capital of Honduras

Population 850,848

landslides and flooding

 

 

Online "slippy" maps

Remote Sensing 

 

Sentinel 2:

S2A (launched 23 June 2015)  and S2B (launched 7 March 2017)

Land use monitoring

Temporal Resolution: Revisit Every 5 days

True Color

Details

From Sentinel 2

Date of image: 22 Feb 2017

Spatial Resolution:

Each pixel represents 20 m

2325 columns

2960 rows of pixels

Sentinel 2

 

Active Sensor

Passive Sensor

Lidar

1 m resolution! 

Electromagnetic Energy

Features on the Earth reflect, absorb, transmit, and emit electromagnetic energy from the sun.

Properties of electromagnetic energy

Multispectral imagery 

wavelength, fequency, amplitude

The visible spectrum is small! 

What else is collected?

Bands and spectral ranges

Spectral signature

How are images rendered on our screen?

3 bands projected light  

The primary colors are Red, Green, Blue

True Color

 

 

= Band 4 Red

 

= Band 3 Green

 

= Band 2 Blue

False Color Composites

Urban areas

 

Urban=Purple​

= Band 12 SWIR II

 

= Band 11 SWIR I

 

= Band 4 Red

Vegetation

 

 

= Band 8 NIR

 

= Band 4 Blue

 

= Band 3 Red

Spectral signature

Bands and spectral signatures

Healthy vegetation

Normalized Difference Vegetation Index

NDVI=NIR-IR/NIR+IR

Animation

Lab Assignment:

Create a 3D geovisualization of Teguciglapa to show land use change over time.

Example:

areas where landslides be connected to land use change?


Future Lessons:

Classification

Supervised & Unsupervised

Animation

Slider

Sentinel-1 images track the major flooding in Kerala during the 2018 monsoon season

Slider

Land use change:

Malakal refugee camp in South Sudan

Digital Globe

Cloud Computing

  • valuable for information dissemination

  • faster and more data processing that was not previously possible

  • data access

Google Earth Engine

  • Cloud-based platform for geospatial analysis

  • Access over 40 years of satellite imagery

  • Upload own data sets to integrate with publicly available data

  • Apply range of common algorithms to data

  • Export images, tables, charts, map outputs

Hansen et al (2013)

High-Resolution Global Maps of 21st-Century Forest Cover Change, Science  

15 Nov. Vol. 342, Issue 6160, pp. 850-853 DOI: 10.1126/science.1244693.

McSweeney (2017) Cocaine trafficking is destroying Central Americ's forests

Title Text

// Load Sentinel-2 TOA reflectance data.
var dataset = ee.ImageCollection('COPERNICUS/S2')
                  .filterDate('2018-01-01', '2018-12-30')
                  // Pre-filter to get less cloudy granules.
                  .filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 20))
                  

//true color
var rgbVis = {
  min: 0.0,
  max: 2500,
  bands: ['B4', 'B3', 'B2'],
};
//urban visualization
var urbanVis = {
  min: 0.0,
  max: 2500,
  bands: ['B12', 'B11', 'B4'],
};

//Agriculture visualization
var agVis = {
  min: 0.0,
  max: 2500,
  bands: ['B11', 'B8', 'B2'],
};
//Healthy vegitation visualization
var VegVis = {
  min: 0.0,
  max: 2500,
  bands: ['B8', 'B11', 'B2'],
};

//Land Water visualization
var WaterVis = {
  min: 0.0,
  max: 2500,
  bands: ['B8', 'B11', 'B4'],
};

//Utrecht
Map.setCenter(5.104480, 52.092876, 11);

//different layers 
Map.addLayer(dataset.median(), rgbVis, 'RGB');
Map.addLayer(dataset.median(), urbanVis, 'Urban');
Map.addLayer(dataset.median(), agVis, 'Agriculture');
Map.addLayer(dataset.median(), VegVis, 'Vegitation');
Map.addLayer(dataset.median(), WaterVis, 'Water');

//END

Summary

Benefits of CyberGIS

  • Data access
  • Distributed data processing
  • Information dissemination through interactive visualizations

Hands on How to:

ArcScene and ArcGIS Pro

We use these tools to add data and create 3D renderings and animations

 

Then we will put them online

and how it was made https://bit.ly/2OfnkZu 

not a great example!

Series of helpful ArcGIS Pro tutorials to help you achieve the goals set forth in this assignment 

Change symbology in ArcGIS Pro

•https://pro.arcgis.com/en/pro-app/help/mapping/layer-properties/extrude-features-to-3d-symbology.htm

 

Make an animation

Animation https://pro.arcgis.com/en/pro-app/help/mapping/animation/overview-of-animation.htm

Essay: What are 3D geovisualizations?

How are they useful for land use change monitoring?

Essay: What was your communication goal in the 3D geovisualization you created?

Do you think you achieved your goal? why or why not?

in class discussion: Spatial and

temporal resolution

What do these terms mean and how are they different?

Name two different Visualization techniques to show change over time.

Thank you!

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