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Address Errors, Omissions, & Conflicts• It almost goes without saying that as the quantity of GIS features
increases the number of associated GIS errors will tend to increase.
• Slightly less intuitive is that as the number of attribute fields increases the potential number of embedded GIS errors also increases.
• With a single GIS feature (123 East Main St) very little can be assessed in the office about the probability that the address feature is correctly positioned or properly attributed.
• However the addition of one or more features in the same featureclass or in any other address related featureclass enables the possibility of detecting an error using GIS Analysis.
• A GIS error can sometimes be noticed if the feature is on top ofanother feature, is not inside a polygon feature, is too far from a feature, is too close to another feature, is not connected to other features, is not connected to the correct number of other features, is not along a polyline feature, is along the incorrect portion of the polyline, or is not between other features.
• Developing the rules for which features to compare with other features and determining which attributes are to be utilized in each comparison varies as the Dataset designs vary.
Address Dataset Designs• Address Ordinances differ from one city to another and
have evolved over time. Rules for assigning Addresses vary by Ordinance. If using GIS to store and manage Addresses, Rules and exceptions need to be accurately modeled with GIS
• GIS address standardization is difficult if the rules are different
• Almost every community in North Carolina uses GIS to manage Addresses - but almost all use a totally different E911 Dataset design.
• Complexity GIS Datasets varies significantly across NC• Address related featureclasses usually not maintained at
the same level as E911 Street Centerlines• The designs include many very different approaches to
recording address and E911 information• Unfortunately this means that error detection methods
must also vary for each community• These are some of the reasons that very few tests are
developed and applied to GIS E911 Data
Sample Address Questions• What featureclasses can have an approved unique
address?• Are unique addresses shared between Features in the
same featureclass? (Two water meters for the same house both contain a copy of the same address.)
• Are unique addresses shared between any Featureclasses? Frequently a water meter, parcel, single family building, and address point have the exact same address attribute.
• Are Address Points available for each primary address?• How are Multi-Address Buildings (Offices, Condos,
Townhomes, and Apartments) and mobile home parks addressed and recorded in GIS?
• Are driveways part of the GIS design?• Are multiple primary addresses allowed along an un-
named driveway? • Are odd and even address numbers allowed on the same
side of the Street?
Recommended Address Steps• Determine the Standard Address for the Feature• Determine if a Primary Address is Recorded with the same
Standard Address• Determine if the Standard Address is contained along one
or more street (or waterway) centerline segment• Determine if the primary address is accessible to the
related street centerline segments• Determine Side, Offset, and Position along Address
Centerline for all Addresses• Add (preferably by automated method) Attribute data
regarding City, EMS, Fire, Police, District as dictated by Dataset design.
• Test all GIS address components to see if combined Attributes and or positions are Possible, Probable, or Unlikely
• Repair, Field visit, or Record Address Conflicts: Override as required
• Finding Address errors or conflicts can help find and correct errors in address related featureclasses
Floral LN - 4742
Will
ow P
ond
RD
- 5
184
Floral LN - 4742
20227 - 20301 Left / 20226 - 20300 Right
Will
ow P
ond
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184
2030
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Floral LN - 4742
20227 - 20301 Left / 20226 - 20300 Right
Will
ow P
ond
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PID: 184346PIN:
03 WILLOW POND RD PID: 11850PIN: 1046432293
20230 FLORA
PID: 184345PIN: 104643225436.000
20307 WILLOW POND RD
PID: 118506PIN: 104643227362.000
20306 WILLOW POND RD
W POND RD
PID: 184347PIN: 104643225257.000
20301 WILLOW POND RD
PID: 119395PIN: 104643228530.000
20322 WILLOW POND RD
PID: 184348PIN: 104643226266.000
20300 WILLOW POND RD
PID: 118502PIN: 104643227493.000
20314 WILLOW POND RD
PID: 1783PIN: 104643226525.000
20315 WILLOW POND RD
PPIN: 10
2022
5
PPIN: 10
202
09334.000ILLE RD
20230 FL
20315 WILLOW POND RD
20307 WILLOW POND RD
20303 WILLOW POND RD
20301 WILLOW POND RD 20300 WILLOW POND RD
20306 WILLOW POND RD
20314 WILLOW POND RD
20322 WILLOW POND RD
Floral LN - 4742
20227 - 20301 Left / 20226 - 20300 Right
Will
ow P
ond
RD
- 5
184
2030
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BldgID: 264930
BldgID: 264906
BldgID: 264864
BldgID: 264749
BldgID: 264911
BldgID: 264941
BldgID: 264778
BldgID: 264792
BldgID: 264837
gID: 370964
BldgID: 370965
20315 WILLOW POND RD
20303 WILLOW POND RD
20301 WILLOW POND RD
Floral LN - 4742
20227 - 20301 Left / 20226 - 20300 Right
Will
ow P
ond
RD
- 5
184
2030
1 - 2
0399
Lef
t / 2
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20230 FL
20307 WILLOW POND RD
20300 WILLOW POND RD
20306 WILLOW POND RD
20314 WILLOW POND RD
20322 WILLOW POND RD
BldgID: 264930
BldgID: 264906
BldgID: 264864
BldgID: 264749
BldgID: 264911
BldgID: 264941
BldgID: 264778
BldgID: 264792
BldgID: 264837
gID: 370964
BldgID: 370965
ID: 1567220307 WILLOW POND RDParcelID: 184345BldgID: 264792CLID: 5184Dist along St: 0Setback: 118.44Side: Left
ID: 1567120303 WILLOW POND RDParcelID: 184346BldgID: 264864CLID: 5184Dist along St: 0Setback: 147.72Side: Left
ID: 1567020301 WILLOW POND RDParcelID: 184347BldgID: 264930CLID: 5184Dist along St: 0Setback: 184.32Side: Left
Setback: 80.81Side: Left
ID: 1566920300 WILLOW POND RDParcelID: 184348BldgID: 264941CLID: 5184Dist along St: 0Setback: 129.39Side: Right
ID: 1566820306 WILLOW POND RDParcelID: 118506BldgID: 264911CLID: 5184Dist along St: 0Setback: 114.93Side: Right
ID: 155620230 FLParcelIDBldgID:CLID: 4Dist aloSetbackSide: Ri
ID: 1566720314 WILLOW POND RDParcelID: 118502BldgID: 264837CLID: 5184Dist along St: 37.5Setback: 100.81Side: Right
ParcelID: 119395BldgID: 264778CLID: 5184Dist along St: 114.09Setback: 83.03Side: Right
Floral LN - 4742
20227 - 20301 Left / 20226 - 20300 Right
PID: 184346PIN:
PID: 184345PIN: 104643225436.000
PID: 118506PIN: 104643227362.000
PID: 184347PIN: 104643225257.000
PID: 118504PIN: 10464322931
4969.000
PID: 119395PIN: 104643228530.000
PID: 184348PIN: 104643226266.000
PID: 1783PIN: 104643226525.000
PPIN: 10
PID: 118502PIN: 104643227493.000
5
PPIN: 10
934.000
Will
ow P
ond
RD
- 5
184
2030
1 - 2
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t / 2
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GIS Basic 911 Address Components
Stored Address:
Embedded in Parcels
As an Address Point File
Embedded in Buildings
As a Combination of Related Features (Points, Buildings, Parcels, Centerlines)
Centerline with:
ID
Name (D,N,T,S)
Address Ranges (Left–Right)
Examples of Common Address ErrorsCenterline Geometry Errors
Shape Opposite Range – FlippedNot ConnectedNot SnappedOverlappingComplex Edge (Not a Driveway)Cross w/o Split (Not @ Overpass)Self IntersectingSelf OverlappingLoopsStarts Stops >2Enters – Leaves > 1Missing Street *Missing Street Segment
Centerline Attribute ErrorsDuplicate CL IDWrong RangeRange OverlapOdd Even SidesIncorrect AttributesIncomplete AttributesIncorrect Attribute Concatenation
Address Geometry ErrorsCoincident Addresses: Re-Address?Incorrect Address LocationMissing Address LocationMissing Address*Multiple Address Locations along an unnamed Driveway or Private Road
Address Attribute ErrorsDuplicate Addresses within the same JurisdictionDuplicate Master Address IDIncorrect Attributes (Not always detectable)Incomplete Address Attributes (Not always detectable)Incorrect Attribute ConcatenationAddress JumpsWrong SideAccessed by Other Streets (Not always detectable)Address references the main road after the unnamed driveway or road is namedAlternate Name or Old name of Street is used
* This error type may require review of other available data such as parcel tax records, building permits, recent orthophotos, or an actual field visit.
Do 911 GIS Errors Exist?Detailed reviews of 34 North Carolina GIS Datasets (containing 56% of NC Population) reveal that the State and perhaps even the Country’s 911 GIS Datasets conceal excessively large numbers of Address Errors or Conflicts.Not a single GIS dataset contained less than 8% errors/conflicts. Eleven Datasets contain conflict rates exceeding 30%.A small percentage of features flagged by automated methods may be found Error free when manually reviewed.In all over 1,000,000 potential conflicts were flagged in the data reviewed (1 error for every 2.4 features).
911 Address Error Class
NuisanceNuisance errors are so trivial that automated
dispatching and addressing software may recognize the correct address and still route the correct unit to the site along the best route.
SevereSevere errors are those that are Potentially life
threatening in nature. Life threatening errors are those that result in the wrong address or no address being selected or that fail to route vehicles to the site, or that fail to suggest the best route.
911 Address Error ClassesIs it a Nuisance
or Severe Error?
SevereDifferent Street NameDifferent Street Type
911 Address Error Class Determination
Determining the actual class of an error is not always easy and may require an intimate working knowledge of the actual 911 software and current procedures used with the GIS Dataset
911 GIS Errors Categories include:
Out of Date DataTypographical ErrorsMissing DataMissing featuresSpatially Inaccurate DataNon-Errors(Accurate representations of non-compliant real world Address Data)
911 GIS Error CategoryOut of Date Data
One or More fields contain data that was correct when entered, but has not been maintained during edits
Long Street1399
4002
Long Street1
2
399
400
Long Street
911 GIS Error CategoryTypographical Error
Usually a few of the fields contain mostly correct data but portions of one or more fields were entered incorrectly
N Long Street1399
2002
N Lung Street201
202
199
4000
911 GIS Error CategoryMissing Data
Critical Data that is missing may cause conflicts with other addresses or affect finding or routing to the correct site.
N Long Street1399
2002
Long Street201
0
199
0
911 GIS Error CategoryMissing features
Missing addresses or street segments can affect finding or routing to the correct site
911 GIS Error CategorySpatially Inaccurate Data
Gross location errors, or small snapping errors within GIS layers: Parcels, Building (polygons), Address or Building Points, Centerlines, Dispatch Districts, Zip Code boundaries, city limits, or ETJs can affect finding or routing to the correct site.
Centerline Network Errors
County Line Bad Route = Late Arrival
$ Damages
Injuries?
Centerline / Address ErrorsNuisance Errors
(
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CLUBHOUSE CT - 96553899472 - 20 Left / 1 - 21 Right
15 PARK AVE 1 CLUB HOUSE CT
6 CLUB HOUSE CT
4 CLUB HOUSE CT
3 CLUB HOUSE CT
8 CLUB HOUSE CT
2 CLUB HOUSE CT
12 CLUB HOUSE CT
16 CLUB HOUSE CT
19 CLUB HOUSE CT
10 CLUB HOUSE CT
18 CLUB HOUSE CT
14 CLUB HOUSE CT
)
)
CLUBHOUSE CT - 96553899472 - 20 Left / 1 - 21 Right
16 CLUB HOUSE CT8 CLUB HOUSE CT
14 CLUB
Centerline Attribute ErrorsRange Overlaps and Odd vs Even Sides
Jurisdiction Full Street NameCenter
ID1Center
ID2From Left
To Left
From Right
To Right
From Left
To Left
From Right
To Right
Guilford County E LEE ST 4715 6893 3227 3249 3226 3248 3235 3259 3234 3258Guilford County E LEE ST 4716 6893 3251 3289 3250 3288 3235 3259 3234 3258Guilford County E LEE ST 4716 6895 3251 3289 3250 3288 3271 3299 3270 3298Guilford County E LEE ST 4716 6894 3251 3289 3250 3288 3261 3269 3260 3268Guilford County E LEE ST 4717 6895 3291 3299 3290 3298 3271 3299 3270 3298Guilford County E STEEPLE CHASE RD 27515 27517 101 199 100 198 101 199 100 198Guilford County ELMONT RD 7777 7775 6525 6627 6622 6624 6529 6599 6526 6598Guilford County EMSLEY RD 45251 45234 6037 6099 6036 6098 6029 6099 6028 6098Guilford County FILTON DR 8367 8368 3901 3999 3900 3998 3901 3999 3900 3998Guilford County FILTON DR 27335 27336 3885 3899 3882 3898 3801 3883 3800 3882Guilford County FORSYTH RD 28514 28512 1323 1329 1334 1330 1331 1599 1332 1598Guilford County FRIENDSHIP CHURCH RD 8959 8974 7003 7051 7004 7050 7051 7057 7052 7058Guilford County GATE ST 9158 9159 101 149 100 148 101 299 100 298
Centerlines FL TL FR TR1 Even Even Even Even
31 Even Even Odd Odd3 Even Odd Even Even1 Even Odd Odd Even1 Odd Even Odd Even
26732 Odd Odd Even Even3 Odd Odd Even Odd2 Odd Odd Odd Even1 Odd Odd Odd Odd
Centerline / Address ErrorsMultiple Addresses along a Private
Driveway
)
)
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)
)
))
)445 HASTY RD
599 HASTY RD595 HASTY RD
447 HASTY RD
443 HASTY RD
439 HASTY RD
315 HASTY RD
288 HASTY RD
267 HASTY RD
HASTY RD - 2195
1 - 1299 Left / 2 - 1298 Right
PVT DR
PVT DR
Centerline Errors Looped Street
)
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DEERFOOT DR - 2553
8201 - 8575 Left / 8200 - 8574 Right
DEERFOOT DR - 2554
8101 - 8161 Left / 8100 - 8160 Right
E REEVES BRIDGE RD - 14625
8757 - 8999 Left / 8756 - 8998 Right
8161 DEERFOOT DR
8155 DEERFOOT DR
8219 DEERFOOT DR
8305 DEERFOOT DR
8343 DEERFOOT DR
8501 DEERFOOT DR
8549 DEERFOOT DR
8571 DEERFOOT DR
8570 DEERFOOT DR
8502 DEERFOOT DR
8480 DEERFOOT DR8460 DEERFOOT DR
8380 DEERFOOT DR
8360 DEERFOOT DR
8342 DEERFOOT DR
8330 DEERFOOT DR
8260 DEERFOOT DR
8148 DEERFOOT DR
8126 DEERFOOT DR
8839 E REEVES BRIDGE RDCompatible with E911 Routing
Software?
3406 PREAKNESS PL
3408 PREAKNESS PL
1711 RACETRACK RD
3410 PREAKNESS PL
1713 RACETRACK RD
105 DERBY PARK AVE
107 DERBY PARK AVE
109 DERBY PARK AVE
104 DERBY PARK AVE
111 DERBY PARK AVE
106 DERBY PARK AVE
DERBY PARK AVE - 2755
101 - 123 Left / 100 - 120 Right
RA
CE
TR
AC
K R
D -
278
7
1709
- 17
19 L
eft /
171
0 - 1
728
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1711 RACETRACK RD
DERBY PARK AVE - 2755
101 - 123 Left / 100 - 120 Right
RA
CE
TR
AC
K R
D -
278
7
1709
- 17
19 L
eft /
171
0 - 1
728
Rig
ht
Centerline ErrorsComplex Street Intersection
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TREE
TO
P D
R -
966
4051
883
2 - 1
4 Le
ft / 1
- 13
Rig
ht
HIC
KO
RY CR
EEK C
T - 9654957418
2 - 20 Left / 1 - 19 Right
7 TREE TOP DR
6 TREE TOP DR
8 TREE TOP DR
9 TREE TOP DR
3 TREE TOP DR
5 TREE TOP DR
12 TREE TOP DR
10 TREE TOP DR
11 TREE TOP DR
14 TREE TOP DR
5 POINT VIEW CT
9 POINT VIEW CT
7 POINT VIEW CT
22 PINEHURST CIR
24 PINEHURST CIR
26 PINEHURST CIR
7 HICKROY CREEK CT
8 HICKROY CREEK CT
9 HICKROY CREEK CT
3 HICKROY CREEK CT
10 HICKROY CREEK CT
14 HICKROY CREEK CT
12 HICKROY CREEK CT
15 HICKROY CREEK CT
(
))
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)
HIC
KO
RY CR
EEK C
T - 9654957418
2 - 20 Left / 1 - 19 Right
7 HICKROY CREEK CT
9 HICKROY CREEK CT
10 HICKROY CREEK CT
12 HICKROY CREEK CT
Address ErrorsAddresses w/ Typographical Errors
Centerline Attribute ErrorsMultiple Streets with same Name
Modify Name6 PIER PT
6 PIER POINTE
Modify Name, Odd-Even Odd-Right5 PIER PT
5 PIER POINTE
2 Leaving
2 Entering
PIER PT - 5880
1 - 5 Left / 2 - 6 Right
PIER PT -
5871
0 - 0 Left /
0 - 0 R
ight
PIER PT - 5860
7 - 9 Left / 8 - 10 Right
SHORELINE DR
50 - 54 Left / 49
2
7
Address ErrorsAddresses w/ Incorrect Attributes
APPLEWOOD ST - 2090701 - 707 Left / 700 - 708 Right
APPLEWOOD ST - 2080709 - 799 Left / 710 - 798 Right
DO
GW
OO
D A
V -
2082
1201
- 12
99 L
eft /
120
0 - 1
298
Rig
ht711 APPLEWOOD AV
704 APPLEWOOD AV
709 APPLEWOOD AV
708 APPLEWOOD AV
710 APPLEWOOD AV
706 APPLEWOOD AV
705 APPLEWOOD AV
APPLEWOOD ST - 2090701 - 707 Left / 700 - 708 Right
704 APPLEWOOD AV
V
216 BUCKSKIN DR
217 BUCKSKIN DR215 BUCKSKIN DR
213 BUCKSKIN DR
211 BUCKSKIN DR
209 BUCKSKIN DR
3620 ELIZABETH AVE
3622 ELIZABETH AVE
Range Error112 BUCKSKIN DR
Address Jump210 BUCKSKIN DR
Address Jump208 BUCKSKIN DR
Address Jump206 BUCKSKIN DR
Address Jump204 BUCKSKIN DR
Range Error, Multiple Addresses Same City114 BUCKSKIN DR
BUCKSKIN DR - 2823
201 - 221 Left / 200 - 220 Right
216 BUCKSKIN DR
217 BUCK215 BUCKSKIN DR
213 BUCKSKIN DR
Range Error112 BUCKSKIN DR
Address Jump210 BUCKSKIN DR
Address Jump208 BUCKSKIN DR
Address Jump206 BUCKSKIN DR
pKIN DR
Range Error, Multiple Addresses Same City114 BUCKSKIN DR
CKSKIN DR - 2823
201 - 221 Left / 200 - 220 Right
Spatially Inaccurate Data
Real Address Error
Incorrect Address Attributes
CenterIDFull Street
NameLocation
ID SideHouse
NumberDistance
AlongDistance
to CL2823 BUCKSKIN DR 13062 Right 204 153.8 542823 BUCKSKIN DR 13091 Right 206 198.7 632823 BUCKSKIN DR 13106 Right 208 248.7 522823 BUCKSKIN DR 13127 Right 210 295.9 542823 BUCKSKIN DR 13159 Right 112 349.2 572823 BUCKSKIN DR 13176 Right 114 397.5 542823 BUCKSKIN DR 13204 Right 216 442.9 59
Address Jumps
Sample Odd-Even Side Range Attribute Conflicts
Typical GIS Building Featureclass ProblemsBuildings lack attributes that could help enhance Address Points
Buildings have not been maintained
Buildings are missing- Address points are not linkable to existing GIS Buildings
Numerous buildings are present but have had major alterations to the footprint
Numerous GIS building representations are no longer present
Building Polygons Split by historic Grid(s)
Featureclass lacks a tie to County building appraisal tables (Typical for GIS Buildings)
Addresses and BuildingsIt may be desirable to code addresses by Type of Feature Addressed and by Active, Inactive, or Future status.
With a small amount of information added to each Building polygon, the potential GIS uses expands significantly.
If sufficient information is added to establish which buildings are Normally Addressable, the potential use in Quality Control of Addresses is enabled.
This information helps in assigning each Address to a building.
Ideally an address point will be located inside the boundary of an Addressable Building. (Near an entrance or near the center of the building are the most commonly desired positions.)
Even when an address point is not located inside a building many Address Point-Building relationships can be determined programmatically.
Address Points and Buildings may have numerous conflicts which require a manual review to determine proper linkage between Address Points and Buildings.
Address Points and Buildings Conflict ExamplesMissing Address?
6178 THACKER DAIRY Rd
Missing Address?Where is 7509 KEATING DRAddress Conflict Examples
Missing Address?Where is 7916 DALTONSHIRE DR?Address Conflict Examples
Address Conflict Examples 4100 US 29 NNot tied to Named Street or Private Drive
Address Conflict Examples
SARAH MARIE DRMultiple Missing
Addresses
Address Conflict Examples
WHITES MILL RDMultiple Missing
Addresses?
Address Conflict Examples
9429 GIDEON GROVE RDMissing Address – Parcel Off
Address – Building Conflict Examples
7161 POWER LINE RDWhich Building?
Address Points and Buildings Puzzle
WHITSETT AVE5 Buildings without Address?
Address Points and Buildings Puzzle
Solution
WHITSETT AVE5 Buildings without Address?9 Addresses with Incorrect Location4 Buildings without Address
Address Point Conflicts – Minor Changes
Addresses matched but required minor attribute changes. Some of these changes may be considered insignificant. FALLINGBROOK CT vs. FALLINGBROOKS CT.
Address Point Conflicts – Address Street DirectionAddresses match a nearby street segment but are closer to a street which has the same name but a different street direction. (These locations should be checked.)
GIS Errors – Address Jumps along CL161 Street Centerlines have Jumps in address Numbers along one or both sides.(Some of these may be due to non-standard geometry.)Usually these represent an incorrect House Number recorded for an Address.
Odd-Even Side Attribute Conflicts2883 Address Points are actually located on the wrong side of the street based on the coded
Centerline Left/Right - Odd/Even Address Ranges and the Direction of the Street as currently represented in GIS. (2,907 if new addresses with Parcel Address as a source are included.)
CL GIS Errors - Access
These 3 houses are inside County but some of the centerlines that would be driven by Emergency services are not readily available. (i.e. stored in adjoining County GIS.)
CL GIS Errors - Splits
At least 787 Street Segments are improperly split.
US Highway 29 N – Ryan Street Exit
CL GIS Errors
Parcel GIS Errors
Parcel GIS Errors
15
3
1
16
1519121
9
11
13
1
3
5
9
11
23
25
29
33
2
4
6
8
10
12
14
4
8
6
10
12
14
28
22
24
18
28
16 1820
24 25
26
28
2917
1921
23
25
25A
27
29
32
31
37
34 61 Buildings w/ Addresses
5 Street Segments
How Many Errors?
Tea
Ct:1
7
My
Way
Dr:1
3
My
Way
:14
My
Way
Dr:1
2
My
Way
Ct:1
5
Street ID Name
From Left
To Left
From Right
To Right
12 My Way Dr 1 5 2 613 My Way Dr 7 13 8 1414 My Way Dr 15 37 16 4015 My Way Ct 1 9 2 1416 No Show Ct 7 15 8 1817 Tea Ct 15 35 16 30
Need more Information
15 Errors or 23%
Error Quiz
34
36
38
40
