Scenario Editor

Scenario Map Structure 1

UrbanFootprint builds a scenario by adding the “change” or “increment” that you’ve painted on top of a base conditions dataset. The combination of the two produces what is known as the “End state.” The “End State” represents what will be on the ground in the future (at what ever time you’re targeting).

Scenario Map Structure 2

It is important to note that this isn’t just a simple addition or replacement of the base condition with the change map. UrbanFootprint implements rules that play several roles to control how overlaps are handled.

Infill/Redevelopment: As you add changes you are also defining for those changes whether any overlaps with the base condition should be treated as Infill where much of the existing land use is left in place, and additional development is added to fill in any available capacity. Alternately the existing condition can be cleared from the parcel to represent a full reconstruction of the location.

Development Constraints: Layers can be added to the scenario that constrain development in locations that overlap. More on these later.

Selecting Polygons to Edit

Hand Selection (Painting) Manual editing by selecting parcels using one of the selection tools.

  • Point (image)
  • Line (image)
  • Polygon (image)

Select the tool

  • Box (drag and hold)
  • Polygon (click to draw the shape, double click to finish)

Draw the area you want to include in your selection

Any parcel that touches the shape will be selected

Query Based

  • Select parcels based on a query
  • Useful for large area edits or applying changes to a large number of parcels that satisfy a conditon.

Work Flow:

  1. Build your query
  2. Apply the query
  3. Apply the Place Type

Scenario Builder

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The scenario builder is where you specify the details about the place type that you're about to apply to a set of selected polygons. While you're not changing the fundamentals of the place type (to do that use the Place Type editing tools), you can specify the percentage of the available land that will have the place type applied to it, scale the density of the place type down, and let UrbanFootprint know whether to overwrite any existing place types (full redevelopment) or to use any available vacant space in the polygon for the place type.

You can select the set of place types you're working with by clicking on the button highlighted in red in the image to the left.

  • Development Pct.
  • Density Pct.
  • Gross/Net Pct.
  • Clear Base Condition
  • Redevelopment Flag
  • Apply
  • Undo / Redo

Development Percent and Density Percent

Development and density percentage controls

Development Pct.:

The percentage of the parcel land area to receive the place type. 50% means that 50% of the available land area will have the place type applied to it. In the graphic half of the parcel has development an the other half does not after applying the place type.

Density Pct.:

The percentage of the place type densities to apply. 80% means that a place type with an average density of 10 du/acre will be applied having 8 du/acre. Note in the graphic the reduced intensity of the right parcel when compared to the left one.

Gross/Net Percentage

Gross/Net Percentage Control

  • Allows assignment of a portion of the space to “No Use”
  • This is used to reserve space for other uses such as drainage, parks, or other infrastructure.
  • This is applied to the developable percentage.
  • For Example: If Dev. Pct is 90% and Gross Net is 90% then 9% of the parcel would be set aside as “No Use.”
  • Assume that we've got a 100 acre parcel
  • Developable space = (100 acres) *90% = 90 acres
  • No Use space percentage = 100%-90% = 10%
  • No Use space = (90 acres) * 10% = 9 acres

Clear Base Condition and Redevelopment Flag

Clear Base Condition

If selected this removes any prior place type from the parcel. If this is not selected, new place types are applied only to the portion of the parcel’s areas set in the Development Percent box.

Example:

Redevelopment Flag

Manually flag a parcel as having been redeveloped. This control is specific to the version of UrbanFootprint with customizations for SACOG.

Applying Land Use

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To apply a land use to a parcel in the active scenario:

  1. Activate the End State layer
  2. Select the Parcels
  3. Select the Place Type using the Scenario Builder
  4. Adjust Settings for the Place Type
    1. Dev, Density, Gross/net: Specify the intensity with which the Place Type will be applied.
    2. Clear Base Condition: Do you want to clear the existing land (redevelopment) or not (infill).
    3. Redevelopment Flag: track where redevelopment was applied
  5. Apply Place Type

While setting the densities, keep an eye on the handy pop-up at the bottom of the screen that tells you how many dwelling units and employees your settings will create.

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The final result: image

To save changes to edited attributes the user must click the apply button when finished editing. If the user changes the selected features without applying changes, those changes will not be saved.

Undo / Redo

The undo and redo functionality allows users to undo or redo their most recent changes on the active layer.

Undo: Clicking the undo button (back arrow) will undo the most recently saved change on the active scenario regardless of the current selection.

Redo: Clicking the redo button (forward arrow ) will redo the most recent change that was made using the undo button regardless of the current selection.

Tip: If the user hovers of the undo or redo buttons, they will see a message with the above definitions.