Geospatial
Visualization

School of Architecture

Dr. Timothy Norris : tnorris@miami.edu
Christopher Mader : cmader@med.miami.edu

Map from the Detroit Expeditions organized by Bill Bunge in the late 1960s (Colvard 1971, 18).

Check - in !! (not for grade)

https://www.menti.com/alm5shgdbiog

Today's Goals

1. Finish join demonstration
2. Initial Sketch Presentations
3. Mapping Las Flores (presentation)
4. Creating Data Exercises
5. Choose next Field presentations

Participatory Mapping in Las Flores

https://tibbben.github.io/clag2020/

Some exercises

• Creating vector data
  > enter data by hand
• Editing vector data
  > modify geometries and attributes

Creating vector data (#1)

• Remember: the project file/folder is NOT the data
  • Create a new map project with data folder - DATA MANAGEMENT
  • When we edit the project we are editing the layout, the symbology, the labels, etc.
  • When we edit the data layers we are editing the geometries and the attributes
  • ^^ these are different things
• Create a data layer
  • In QGIS: menu: Layer > create > GeoPackage
  • In ArcGIS Pro: ArcCatalog window > geodatabase folder (gdb) > right click > new > Feature Class
  • Call it "swamps," make sure it is polygon, give it the local Florida state plane CRS, and click next
• Define the columns you want ...
  • Create a "Name" column that is text.
  • Create an "Area" column that is Decimal or Double.
  • click next

Creating vector data (#2)

• Make Layer editable
  • QGIS - the little yellow pencil
  • QGIS - look for the editing icons in tool bars
  • ArcGIS - Edit tab -> Create
  • ArcGIS - Look for correct polygon tool in the correct layer on the right
• Add features
  • Add a base map with satellite imagery
  • Locate a swamp
  • With the polygon tool selected, start to draw
  • Try to maintain one scale
  • Right click to finish sketch/part
  • Remember to save edits often
    (layer, not the project)

Creating vector data (#3)

• Edit attributes ArcGIS Pro
  • Open the attribute table for swamps
  • Enter a name (or names) for your swamp(s)
  • Right click the "Area" column and choose "Calculate Geometry"
  • Set "Property" to "Area (geodesic)" and "Units" to "Acres"
  • Set "Coordinate System" to "swamps" and click "ok"
• Edit attributes QGIS
  • Open the attribute table for swamps
  • Enter a name (or names) for your swamp(s)
  • Open the field calculator and update the existing field "Area"
  • From the middle list of funcitons and columns, find "Geometry and select "$area"
  • In the expression box on the left make it look like (for sq ft to acre conversion):

    $area / 43560

  • click OK
• Turn off layer editing

Editing vector data

• Remember: the project file/folder is NOT the data
• Make Layer editable
  • QGIS - the little yellow pencil
  • ArcGIS - right click > make layer editable
• Modify features
  • add, delete, or move entire feature
  • for one feature: add, delete, or move vertices
  • modify attribute data for individual features (in attribute table)
  • Remember to save edits often (not the project)
• Turn off layer editing

Symbolizing the swamp

• An image based polygon fill
• Find a grass like png online (open source) and resize to about 60px and save in your project folder
• ArcGIS
• Layer symbology ... (double click icon in table of contents)
• In symbology pane find "Properties" tab
• Change the fill color to a light green that is somewhat transparent
• With the wrench icon, add a new symbol fill layer
• Select "Picture fill" for fill type
• With the picture button, locate your save file
• Set size to about 10pt and click "Apply"
• QGIS
  • From layer properties, click the symbology pane
  • Under "Single Symbol" click "Simple Fill" and set the color to a dull somewhat transparent green with no border
  • On the right click the "+" icon and add another layer to the symbology; select "Raster image fill"
  • With the selector directly below, locate the file and load
  • set the size to about 12 pixels
  • Click OK

The Homework

• Add some butterflies, symbolize, label, and create a layout.
  • Create a point layer called "butterflies" with attributes: "common_name" and "scientific_name"
  • Edit the layer and add a few butterflies on your swamp, make sure to edit the attributes and fill in fields (can be made up)
  • Find a butterfly image (png) and symbolize the layer with the image you found
  • Label the layer with the "common_name"
  • Make a simple layout with title, legend, and scalebar
  • Include a textbox with the sources of your data (traced from ..., made up by ...)
  • Take a screenshot and send along