Base canvas editing enables you to easily update UrbanFootprint’s land use canvas so that your project reflects local knowledge and supplementary data sources. UrbanFootprint will recalculate and update project area totals and even make updates to existing scenarios to reflect changes to the existing land use base canvas.
To edit the base canvas, follow these steps:
Step 1 - Select the Base Scenario
Make sure you have selected the Base Scenario.
Step 2 - Enable Build Mode
Click on “Build” in the left hand Modes Bar.
Clicking on Build will activate the Base “Canvas” for the scenario (highlight it in blue). A layer must be activated to select features (geometries) in it.
It will also open the right-hand Build pane.
The Build pane includes:
- Selection: A summary of the currently selected features, including a features count and the sum of acres in selected parcels or blocks.
- Type: Menus of available Place or Building Types.
- Reclassify: Button used to deploy Place or Building Types on to selected geometries.
- Revert: To wipe away any changes made to selected features and reset it to the original Type and values, use Revert to Original.
- Undo / Redo: Arrow buttons that undo or redo Reclassify actions.
Step 3 - Select Features From the Base Canvas Layer
Select features using one of two methods (or a combination of both):
Once one or more features are selected, the Build pane will summarize the selection.
Step 4 - Select a Building Type or Place Type
To open a Type palette: Click the Building or Place Type button in the Build pane.
To select a Type, click on it. To view a summary of key attributes for a Type (beyond the dwelling unit and employee densities per acre), click on the expand arrow.
Step 5 - Choose Reclassification Method
Once you have selected features on the map and a Building or Place Type, you will be given the option to update data values when reclassifying, or leave the values as they are.
Updated base values (default): This is the more common choice. Reclassification changes the current Building or Place Type assigned to a feature. “Updating base values” modifies the underlying data at the same time (population, dwelling units, employees, and building area).
Original base values: You can opt out of modifying the data values and just change the Building or Place Type assigned to features. (Note that this option can lead to the underlying assumptions for Building and Place Types being out of sync with the data values in the base canvas.)
Step 6 - Reclassify
Reclassification will be enabled once you have:
- Selected one or more parcels or blocks
- Chosen a Building or Place Type
- Indicated your choice of ‘Updated base values’ OR ‘Original base values.’
To Reclassify, click the blue RECLASSIFY button (you can always undo it later).
Because editing the Base Canvas can have far reaching impacts on a project (e.g. it will update all scenarios automatically and likely require updating analysis module results), you will be asked to confirm reclassification every time you click the reclassify button.
Click Reclassify to complete the reclassification.
Once you click Reclassify, the reclassification will be saved. If the Reclassify action impacts paints in any scenarios, the impacted scenarios will update automatically. When many map features are reclassified at once, you will likely see indications that the affected scenarios are updating:
In most cases, scenario updates will cause analysis results to be ‘out-of-date.’ Modules must be re-run manually.
Revert to Base
Sometimes you will want to clear past Reclassify actions by directly selecting features (parcels or blocks) on the map. Unlike the undo button, which rolls back Reclassify actions chronologically, Revert to Base allows you restore the original base by making targeted selections. Select any features on the map that you want to revert to the original base values and click the Revert to Original button. This will reset the features to the original base values.