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Reporting Linear Feature Updates
There are a variety of methods that can be used
to create feature updates.
In this video,
I will demonstrate directly updating the edges layer
provided by the Census Bureau.
Other methods may be used
if the feature update return file meets all Census Bureau
requirements which can be found
in the Digital BAS Respondent Guide.
It is important that the user have a local source file and/or
imagery available when making feature updates.
This will insure that the features are placed
in the spatially correct location.
In this example, I am using imagery
to make the linear feature updates.
To start editing the Census edges layer,
click Editor, then Start Editing.
In the Start Editing window, select the folder
that contains the edges layer from the Source pane.
Click OK to dismiss this window.
In the first example we want to add a missing street
to the Census edges layer.
Set Selectable Layers to the Census edges layer only.
Open the Create Features pane by going to the Editor dropdown,
selecting Editing Windows, then Create Features.
Select the feature type to create
from the Create Features pane.
I've already grouped by MTFCC so I'll select S1100, 1200,
etc. Click the Straight Segment tool on the Editor Toolbar.
Digitize the missing street by left clicking
to start drawing the edge.
Single click to create vertices
and double click to complete the edge.
Remember to set the snapping as necessary.
Open the attribute table for the edges layer
and click the Show Selected Records button found
on the bottom of the attribute table.
In the MTFCC field, enter the MTFCC of the new street feature.
This new street is a local neighborhood road,
so l will enter S1400.
A complete list of MTFCC codes and descriptions can be found
in the Digital BAS Respondent Guide.
Enter the name of the new street in the FULLNAME field.
We'll name this new street Southern Maple Lane SW.
Enter the type of change in the CHNG underscore TYPE field.
This is a new street feature so I will enter "AL",
which represents an add line.
Remember to always save your edits by going
to the Editor dropdown and selecting Save Edits.
In the next example, we will delete a street feature
that does not exist.
Click the Edit Tool on the Editor Toolbar.
Using the Edit Tool, select the street features
from the edges layer that do not exist.
In this example, I am selecting Southern Pine Lane SW.
In the edges layer attribute table, enter the type of change
in the CHNG underscore TYPE field.
This is a deleted street feature, so I will enter "DL",
which represents delete line.
Leave all other fields populated, specifically TLID.
The TLID is a unique identifier that allows the Census Bureau
to identify the street feature.
Save your edits.
In this last example, we will rename a street feature
that the Census Bureau has named incorrectly.
Click the Edit Tool on the Editor Toolbar.
Using the Edit Tool, select the street features
from the edges layer that are named incorrectly.
In this example, I am selecting Southern View Lane SW.
In the edges layer attribute table, enter the correct name
of the street feature in the FULLNAME field.
Here, I am correcting Southern View Lane SW
to Northern View Lane NW.
Enter the type of change in the CHNG underscore TYPE field.
Since we are changing the attributes
of the street feature, I will enter "CA",
which represents change attributes.
Leave all other fields, including TLID, populated.
Save your edits.
If you wish to change the MTFCC of a street feature,
the same methodology applies.
Replace the MTFCC in the MTFCC field with the correct code
and enter "CA" as the change type
in the CHNG underscore TYPE field.
Extracting all updated features
from the Census edge layer is the final step
in creating a feature update return layer.
To extract your changes from the Census edges layer you will need
to select all records that have a change type code.
In the Main Menu, click Selection
and Select by Attributes.
In the Select by Attributes window, select the edges layer
from the Layer dropdown menu.
The Method dropdown menu should be set
to Create a new selection.
Double click CHNG underscore TYPE in the field list.
Click the does not equal button, then click Get Unique Values.
In the list of unique values, select NULL.
NULL is represented by two single quotes.
Click OK. This process selects all records from the edges layer
that have a change type assigned to them.
This will include any street that you added, deleted,
or modified attributes for.
Right-click on the Edges layer in the table of contents
and select Data, then Export Data.
Verify that the Export dropdown menu
in the Export Data popup window is set to 'Selected Features'
and that you use the same coordinate system
as 'this layer's source data'.
Save the output dataset
to a pre-designated location using the naming conventions
found in the Digital BAS Respondent Guide.
We will name this dataset (BAS plus the two digit year
underscore BAS Entity ID underscore LN underscore
changes) For more information on linear feature updates
and requirements, please refer
to the Digital BAS Respondent Guide.