Pauer Cartography Award

• Submissions are open!
• Cash prize
• Traditional cartography, 3D mapping, and web maps
• Let me know if you want to submit.

Videos

• Modules 05 and 06
• have been posted.

POSTPONED

Sites

Review

First goal

• How much of x is in (or near) y?
• Highly accurate and precise data now.
• Essential GIS.

Second goal

• Where x_n is in y, z exists.
• x_n is any number of variables.
• z is not directly observed, but predicted.
• Spatial modeling.

Current goal

• Where x_t1 != x_t2, e occurred.
• x_t is same variable at different times.
• != is not equal to – they are different.
• e is an event that caused the difference.

Change

There is nothing permanent except change.

– Heraclitus, 500 BCE

We will be known forever by the tracks we leave.

– Dakota Tribe

Land use change

• NLCD captured every ~five years (2001-2019)
• Raster cells are 30m x 30ma and align across years.
• Class codes (land cover types) are the same across years.
• c_t1 != c_t2 if true, change occurred.

In-class task

• Open the explore-change.ipynb Notebook.
• Find how much land was developed between 2001 and 2019
• within 20 miles of your hometown.

Mass terrain modification

• Dam building. Mountain Top Removal (MTR).
• Surface mining creates overburden
• which becomes valley fill.
• Explore Google Maps

Elevation change

• Lidar derived DEMs from 2010 to current.(>5ft resolution)
• USGS DEMs from the early 1990s. (10m resolution)
• change = DEM_t1 - DEM_t2
• If it is not close to 0, change occurred.

In-class task

• Find a surface mine site
• and show the change in elevation between the DEMs
• within two miles of the center of the site.

Above-ground change

• Compare lidar Phase 1 to Phase 2
• via their DSMs.
• change = DSM_t1 - DSM_t2
• You'll need two point clouds to do this.

Visualization

• Colorize Phase 1 point cloud by amount of removal
• and Phase 2 by amount of addition.
• Show both simultaneously.
• 🤯

Colorize

• Point cloud can be colored by any RGB image.
• Export raster and force rendering to RGB.

Sunrise spring equinox

• Create hillshade from DSM
• enabling shadows.

In-class task

• Color Phase 1 point cloud by amount of removal
• and Phase 2 by amount of addition.
• Make a layout showing change.

STOP