3D Geovisualization
Assignment
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Britta Ricker, PhD
M-GEO Extract/Analysis and Dissemination GeoData
ITC
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5905178/pasted-from-clipboard.png)
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
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Implement design principles learned in lecture
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Build upon knowledge and data from previous assignments
Today in Class
- GIS & Remote Sensing
- Color Composites
- 3D Geovizualition
- Walk through:
- ArcGIS Online
- ArcScene
- ArcGIS Pro
Disaster and Land Use
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5662646/pasted-from-clipboard.png)
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5663530/pasted-from-clipboard.png)
Maps can help reduce complexity
![](https://d32ogoqmya1dw8.cloudfront.net/images/NAGTWorkshops/geomorph/vignettes/land_use_change_history.jpg)
![](https://d32ogoqmya1dw8.cloudfront.net/images/NAGTWorkshops/geomorph/vignettes/impact_clearcutting_slope_stab.jpg)
Vanacker (2016) Impact of deforestation on slope stability
Geographic Information
Science
Geographic Information Systems(GIS)
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Geographic Information Systems (GIS)
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/2226503/Fig1_Ready.png)
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Online "slippy" maps
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5660413/pasted-from-clipboard.png)
Remote Sensing
![](http://www.georas.nl/img/index.png)
![](https://media0.giphy.com/media/3fibz5opL3jqrFgvXi/giphy.gif)
Temporal Resolution: Revisit Every 5 days
True Color
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Details
From Sentinel 2
Date of image: 22 Feb 2017
Spatial Resolution:
Each pixel represents 20 m
2325 columns
2960 rows of pixels
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Sentinel 2
![](https://media0.giphy.com/media/M6BaAdqcb78Na/giphy.gif)
Active Sensor
Passive Sensor
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5649520/passive-satellite.png)
Lidar
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![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5660358/pasted-from-clipboard.png)
1 m resolution!
Electromagnetic Energy
Features on the Earth reflect, absorb, transmit, and emit electromagnetic energy from the sun.
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5659671/pasted-from-clipboard.png)
Properties of electromagnetic energy
Multispectral imagery
![](https://media1.giphy.com/media/4cqbCFU6b0LjW/giphy.gif)
wavelength, fequency, amplitude
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The visible spectrum is small!
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5660589/pasted-from-clipboard.png)
What else is collected?
Bands and spectral ranges
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5649507/Sentinel2_Spectral_Bands.jpg)
Spectral signature
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5659666/pasted-from-clipboard.png)
How are images rendered on our screen?
3 bands projected light
The primary colors are Red, Green, Blue
![](https://upload.wikimedia.org/wikipedia/commons/e/e6/RGB_Additive_Model.gif)
True Color
= Band 4 Red
= Band 3 Green
= Band 2 Blue
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5660037/pasted-from-clipboard.png)
False Color Composites
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5659890/pasted-from-clipboard.png)
Urban areas
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5660007/pasted-from-clipboard.png)
Urban=Purple
= Band 12 SWIR II
= Band 11 SWIR I
= Band 4 Red
Vegetation
= Band 8 NIR
= Band 4 Blue
= Band 3 Red
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5660035/pasted-from-clipboard.png)
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5660037/pasted-from-clipboard.png)
Spectral signature
Bands and spectral signatures
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5659839/pasted-from-clipboard.png)
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5667713/Screen_Shot_2019-01-13_at_7.57.16_PM.png)
Healthy vegetation
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5649597/NDVI.png)
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5649596/True_NDVI.png)
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
![](https://s3.amazonaws.com/media-p.slid.es/uploads/278564/images/5667845/land_use_animation.gif)
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
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valuable for information dissemination
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faster and more data processing that was not previously possible
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data access
Google Earth Engine
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Cloud-based platform for geospatial analysis
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Access over 40 years of satellite imagery
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Upload own data sets to integrate with publicly available data
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Apply range of common algorithms to data
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Export images, tables, charts, map outputs
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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.
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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
![](https://media3.giphy.com/media/fjxPQg2SoS46HOSIjs/giphy.gif)
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?
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Name two different Visualization techniques to show change over time.
Thank you!
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3d geoviz and land use change
By Britta Ricker
3d geoviz and land use change
- 1,359