by Amit Sinha, Esri, Inc. Stormwater is the water that runs off property when it rains. When stormwater flows across driveways, parking lots and other surfaces, it picks up dirt and pollutants along the way. When this polluted water reaches … Continue reading
In the parcel fabric, the parcel name text field is used to store the parcel identification number (PIN). This PIN is sometimes called APN (Assessor Parcel Number) or AIN (Assessor Identification Number) and other conventions. This number is usually kept unique by constructing it from the book, page and a sequential number, as well as similar methods. The field might store “264014001” which stands for Book 264 Page 014 Parcel 001 and can be formatted to show “264-014-001”.
Best practices include the use of label classes to show the full PIN when zoomed in and only the last 3 digits when zoomed out.
- Label expression: to separate the parcel number by dashes you can use a label expression similar to this: Left([Name],3) & “-” & Mid([Name],4,3) & “-” & Right([Name],3)
- MapTips: some users prefer to only label the last 3 digits and use a MapTip to show the parcel number when hovering over the parcel.
- To do so, activate your MapTip in the Layer’s Display Tab.
- To get the MapTip in the example above, use the following expression:
” Book: “& Left([Name],3) & vbNewLine & ” Page: “& Mid([Name],4,3) & vbNewLine & ” APN: ” & Right([Name],3)
Content for this post from Amir (Parcel Editing Team)
A parcel map requirements for line dimensions used to be hard to achieve using only labels. This is the reason many user reverted to the use of annotation. But maintaining annotation is labor intensive, designed for a specific scale and prone to user error. Labels, on the other hand, are database driven, can be easily compared with the line’s geometry as part of the QA process and require no maintenance once configured. We spent a few hours configuring the labels for parcel lines and you can see the results below, which are just as good, if not better. This result could have never been achieved without the parcel fabric redundancy of lines and the concept of line-point.
This post can help you configure labels for parcel fabric lines using the standard label engine or the Maplex extension. Even if you are forced to use annotation, you can benefit from this configuration, as labels can easily be converted to annotation. Continue reading
In a previous post, we talked about how to perform a vacation of an ally or right-of-way parcel using the parcel fabric data model in conjunction with the Local Government Data Model and the Tax Parcel Editing Template from the resource center. For this post we are going to talk about the same process, but without recreating the original lots. As with the previous post, we will be working through an example provided by the City and County of Denver. For this example, the lots currently in the database do not match the legal description (the lots should all be 125 X 25), which is a common occurrence in most databases.
Performing the Vacation without re-creating the original lots
Using the existing lots is the easiest and most straightforward way to go, but not the best-practice. You could think of this as the quick-and-dirty way to get the tax parcels added and move on with your day.
1. Begin by creating a connection line for the gap between the two disconnected groups. Use the tool on the Parcel Editor toolbar. This ensures that a construct from parent process will work, since it requires the group to be connected.
2. Use the parcels on the northernmost part of this group, across the gap (alley). Note the 29’ distance and 87 degree bearing. The distance measurement should be 30’, with a bearing closer to 90 degrees. Since we are going with the current set of lots, though, we will simply hit the Apply button to use these numbers.
3. Select just the Tax Parcels that you need to extend to the center of the ROW (Alley) being vacated, right click and select the Construct from parent option.
4.Select the Segmented Line Tool at the top of the Parcel Details window.
Create a two part segmented line over the top of the connection line that you created. Take note that the lines as inversed are 14.515ft, not 15. This is due to the lots/parcels not being repaired prior to the edit.
Note: Be careful, there are two points very close together 81 & 121 in this data.
5. Same for the southern edge, connecting the midpoints together with another boundary line, to form a centerline running down the middle of the alley/ROW.
6. Next step is to create lines across the construction lines used to re-create the ROW (Alley) and the centerline.
a. Start at point 116 as shown here and then place the cursor in the Bearing field
b. We want to extend the parcel line along the same bearing, so move the cursor to snap to the tax parcel line that you want to pick up, hold SHIFT and then click to pick up the bearing (this will populate that value in Bearing field).
c. Purposely type in something longer than 14.5 (1/2 way point or ROW width)
d. Use the Planarize command to break the line at the centerline. Select the overlapping piece in the grid, right click and choose the Delete Rows option to remove it.
7. Continue this process until all the remaining tax parcels have been extended to the ROW (Alley) center and then merge the smaller pieces to you existing tax parcels to get you final output. In this example, there are no historic ROW parcels created, since they were not there to begin with.
Content provided by Larry and Chris (Parcel Editing Team)
The parcel fabric data model lends itself to many improved workflows for managing your parcels, particularly when it is used in conjunction with the Local Government Data Model and Tax Parcel Editing Template for ArcGIS 10, which you can download from the resource center. Some of these improved workflows are hard to detail in the help, though, so we’re hoping some blogs will help out. One of these workflows comes from the City and County of Denver and centers on how you perform a vacation of an alley or right-of-way parcel. The City and County are using the Local Government Data Model, which provides the ability for managing not only parcels, but also Lots and Subdivisions.
There are a few things to consider before performing an
alley vacation or creating any new parcel(s).
1. Does the alley exist in the lot layer?
If the alley exists, the first step
before doing any work would be to make sure the original lot (alley) is marked appropriately
in the historic layer (marked as Vacation).
2. How accurate are the measurements on the
adjacent block edges/lots?
In the data that was used for this
example, the lots should be 125 feet by 25 feet, but a look in the parcel
description shows the measurements are off for some of the lots.
The best practice in this case is to
re-enter the original blocks by cogo-ing the outer boundary of the block from
recording, and then using the Parcel Division tool or Construction to recreate
the lots. Once completed, these blocks can be joined to the Fabric using
control points or even orthophotography.
Of course, the tax parcels would also have to either recreated from the
lots or re-joined to fit the newly constructed lots.
The first workflow listed below can be used
for this task. In a later post, will
talk about how to complete this process without recreating the lots.
Recreating Blocks and Lots from Records (original city subs)
1. Mark original lots historic or delete them all
together from the Fabric. In this example,
I’ve left this step until the end so that I can use the lots as reference to
name the new ones
2. COGO entire block boundary from record. For this example, all of the lots are 125 X
a. Create a new Plan, and give it an appropriate
b. Create a new construction inside that plan, set
the parcel template to “lots”
c. COGO the outer boundary like this:
Please note that the alley was divided two pieces. More on that later. Also note that the original lots are displayed in the background.
d. Delete the 575’ measurement
e. Select the Segmented Line Tool from the top of the Parcel Details window:
To start, make sure you cursor is in the FROM cell of the next available row and click in the grid to replace the NW corner, type “23” to get 23 equal segments or right click.
f. Click the SW corner, and do the same thing for all the other edges.
g. Digitize in the connect lot lines, create a connection line for the center of the Alley.
3. Build and Join. For this example, the parcels are turned off and we joined directly to photography as control. Later on, the data can be re-adjusted to proper control if desired.
a. Then create any join links between the existing Parcels and the new lots…make sure to have points turned on for this!
b. Hit OK, and the data will now look like this:
4. This will make the ROW (Alley) Vacation easier since you now have the centerline of the ROW (Alley) to use to expand the tax parcels.
a. With the Tax Parcels and just the ROW (Alley) in question selected, we can use the Construct From Parent option to do the rest of the line work.
b. We can digitize over the connection lines, creating new lines that extend the current tax parcels. The Planarize command can be used to get rid of any excess. We then build to create polygons and merge the smaller vacation leftovers to the current tax parcels, carrying their attributes over to the newly expanded parcel.
c. Finally, mark ROW (Alley) Vacated (Historic).
Content from Larry and Chris (Parcel Editing Team)
With the release of ArcGIS 10, Esri is now providing you a Land Records solution as a core part of the ArcGIS. This solution will help you produce great web maps, implement efficient workflows, and incorporate best practices from the land records industry at large.