Leonard Sullivan-Oklahoma County Assessor, 320 Robert S. Kerr #313, Oklahoma City, OK 73102
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Mapping/GIS Department


Locating land is fundamental to the tax mapping process.  Once land is located it must also be given its own unique "name".   This is called parcel identification.  A good land description will permanently and distinctly locate one and only one individual parcel of land.  In Oklahoma, land is described by written descriptions or legally recorded plats.

Written land descriptions may be based on the rectangular survey system (also known as the township and range system), a metes and bound description or a coordinate description system.  This system is based on the idea of parallels and meridians that circle the globe.  The equator and all horizontal lines north and south of it are known as parallels.  The vertical lines which converge at the north and south poles are known as meridians.

The rectangular survey system also has its own special meridians and parallels throughout the United States.  The meridians are known as "principal" meridians.   Each principal meridian has a parallel which goes with it.  These are known as "base" lines.  The points where these two meet are known as initial points.   In Oklahoma, land described using this system is referenced to either the Indian or the Cimarron Meridians.  We also have the original 1905 Government Lot Survey Books available.
1905 Government Survey Lot Books

Another set of lines is established at 24 mile intervals north and south of the base line and at 24 mile intervals east and west of the principal meridian.  The east-west lines are called standard parallels or corrections lines.  They are one continuous, uninterrupted line.  The north and south lines, called guide meridians, are not continuous throughout their length.  Because meridians converge as they get closer to the poles, they must be broken at the base line and at each standard parallel.

 

 

 

The guide meridians and standard parallels form a 24 mile square.  Each of these 24 mile squares is divided into sixteen smaller units of land called townships.  A township is, as nearly as possible, six miles by six miles.   A row of townships extending north to south is called a range and a row east to west is called a tier.  Each township is further divided into 36 one mile square areas called sections.

 

 

 

 

 

 

 

Sections can be subdivided as well.  The quarter section (160 Acres, 1/2 mile square), the half-quarter or eighth sections (80 Acres, 1/4 mile by 1/2 mile), and the quarter-quarter or sixteenth section (40 Acres, 1/4 mile by 1/4 mile).  The quarter-quarter section is the minimum legal subdivision under the general land laws but it is common to divide the subdivision further for descriptive purposes.

 

 

 

Plat Map ExampleGraphic land descriptions are based on the recording or filing of maps.  These descriptions are known as "recorded map descriptions" or "legally recorded plats".  Record map descriptions are descriptions of parcels by reference to lot numbers (or letters) and/or block numbers (or letters), and name or numerical designation given to a recorded or filed map.

 


The County Assessor's office also uses aerial photographs to locate and identify property.  There are several types of aerial photographs as listed below:

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Aerial Photographic Enlargement - is nothing more than a "blown-up" photograph.  Neither tilt nor relief displacement are removed for these photographs.  Because of this, you will not be able to make accurate measurements from the photo of from maps made from it.   These photos are helpful for inventory of parcels and locating structures.

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Rectified Aerial Photograph - is one in which distortions caused by tilt displacement have been removed.  The rectification process is accomplished by projecting the photo image onto a flat surface that is tilted to eliminate the original tip and tilt of the aircraft.   The objective is to project the image back to its correct shape and scale.   Although relief displacement is not removed from rectified photographs, this type of photography provides acceptable accuracy for assessment mapping in areas of relatively flat terrain.

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Ortho-Photographs - look a lot like the other two types of aerial photographs.   However, it has the accuracy of a map drawn from ground survey information because tilt and relief displacement have been eliminated.  Measurements of a land surveyor on the ground should "fit" when plotted on a true-to-scale ortho-photograph.   Distances and area calculations on an ortho photograph are usually extremely accurate, and property lines will correspond closely to physical features.

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Digital Ortho-Photographs - is an ortho photograph scanned or created in a digital format.   These have the same accuracy as ortho photo sheets, but can be viewed and manipulated on the computer, with the capability to zoom in or out.  This also provides us a method to lay property lines or any other data over the photo.


GIS now a Reality.....

GIS or Geographic Information Systems (GIS) has become a reality in our office. The initial base maps are complete, covering all 720 square miles of Oklahoma County.  We are now maintaining and constantly updating new plats, sub-divisions and parcel splits into our digital maps.  A new law took effect this year requiring developers to submit digital plats or sub-divisions in State Plane coordinates, this will help streamline the process of integrating these plats with our existing digital maps.

We can now connect with our CAMA (Computer Automated Mass Appraisal) system. We are able to retrieve data from the parcel or account number as you view the map on the same screen. We are also able to search the data on the CAMA system and produce the information on a map.  This can now be done both internally and on our GIS website.

 

We also have new color digital aerial photographs, some of the most accurate aerial photographs available, for all of Oklahoma County which were taken in 2003, 2004, 2005 and 2006.   We can overlay the digital maps on the color aerials to help determine improvements to the property, land use, and other important changes.  The file formats consist of the original TIF's as well as the converted Mr. SID files including one large mosaic SID file of the entire county. 

 

 GIS Map Example

 

Our mapping website features the digital maps and color aerial photos. Searches can be performed by owner name, physical address, or account number. Centerline data was also added to search by street intersection. We will also be able to identify owners by buffer zones, like the 300 foot radius to notify property owners required for zoning changes. We also have school districts, city boundaries, political districts as well as flood plain and contour data.  Queries can be made by owner name, legal description, physical address, or account number.  Centerline data is also available to query by street intersection. Upgrades to this site will be made on a continuous basis.
 



Flood Hazard Mapping...
Flood Hazard Zone Designations
Per FEMA website taken 4/26/2015  -  Click here to access the FEMA Website

What are the different flood hazard zone designations and what do they mean?

The zone designations shown on the FIRMs are defined below.

Zone A
Areas subject to inundation by the 1-percent-annual-chance flood event generally determined using approximate methodologies. Because detailed hydraulic analyses have not been performed, no Base Flood Elevations (BFEs) or flood depths are shown. Mandatory flood insurance purchase requirements and floodplain management standards apply.

Zone AE and A1-A30
Areas subject to inundation by the 1-percent-annual-chance flood event determined by detailed methods. Base Flood Elevations (BFEs) are shown. Mandatory flood insurance purchase requirements and floodplain management standards apply.

Zone AH
Areas subject to inundation by 1-percent-annual-chance shallow flooding (usually areas of ponding) where average depths are between one and three feet. Base Flood Elevations (BFEs) derived from detailed hydraulic analyses are shown in this zone. Mandatory flood insurance purchase requirements and floodplain management standards apply.

Zone AO
Areas subject to inundation by 1-percent-annual-chance shallow flooding (usually sheet flow on sloping terrain) where average depths are between one and three feet. Average flood depths derived from detailed hydraulic analyses are shown in this zone. Mandatory flood insurance purchase requirements and floodplain management standards apply.

Some Zone AO have been designated in areas with high flood velocities such as alluvial fans and washes. Communities are encouraged to adopt more restrictive requirements for these areas.

Zone AR
Areas that result from the decertification of a previously accredited flood protection system that is determined to be in the process of being restored to provide base flood protection. Mandatory flood insurance purchase requirements and floodplain management standards apply.

Zone A99
Areas subject to inundation by the 1-percent-annual-chance flood event, but which will ultimately be protected upon completion of an under-construction Federal flood protection system. These are areas of special flood hazard where enough progress has been made on the construction of a protection system, such as dikes, dams, and levees, to consider it complete for insurance rating purposes. Zone A99 may only be used when the flood protection system has reached specified statutory progress toward completion. No Base Flood Elevations (BFEs) or depths are shown. Mandatory flood insurance purchase requirements and floodplain management standards apply.

Zone V
Areas along coasts subject to inundation by the 1-percent-annual-chance flood event with additional hazards associated with storm-induced waves. Because detailed hydraulic analyses have not been performed, no Base Flood Elevations (BFEs) or flood depths are shown. Mandatory flood insurance purchase requirements and floodplain management standards apply.

Zone VE & V1-30
Areas subject to inundation by the 1-percent-annual-chance flood event with additional hazards due to storm-induced velocity wave action. Base Flood Elevations (BFEs) derived from detailed hydraulic analyses are shown. Mandatory flood insurance purchase requirements and floodplain management standards apply.


Acreage and Proportionate of the Soils
Provided by USDA - Natural Resources Conservation Service Data Version Date 04/22/2004

Download Soil Report Adobe .pdf format...requires the Adobe Acrobat Reader.  

Map Unit Symbol Map Unit Name  Acres  Percent
AhpA Ashport silty clay loam, 0 to 1 percent slopes, occasionally flooded          1,734 0.4
AmbE Amber very fine sandy loam, 5 to 15 percent slopes, rarely flooded             954 0.2
AshA Asher silty clay loam, 0 to 1 percent slopes, rarely flooded          2,118 0.5
AspA Ashport silt loam, 0 to 1 percent slopes, occasionally flooded          3,473 0.8
AstA Ashport silt loam, 0 to 1 percent slopes, frequently flooded          8,489 1.8
BetA Bethany silt loam, 0 to 1 percent slopes          1,573 0.3
BetB Bethany silt loam, 1 to 3 percent slopes          1,264 0.3
BeUB Bethany-Urban land complex, 0 to 3 percent slopes          4,851 1.1
CaaA Canadian fine sandy loam, 0 to 1 percent slopes, rarely flooded             158 *
CaUB Canadian-Urban land complex, 0 to 1 percent slopes, rarely flooded             304 *
CoIC2 Coyle-Ironmound complex, 3 to 5 percent slopes, eroded             604 0.1
CoUB Coyle-Urban land complex, 1 to 3 percent slopes             620 0.1
CoyB Coyle loam, 1 to 3 percent slopes             499 0.1
DalA Dale silt loam, 0 to 1 percent slopes, rarely flooded          2,860 0.6
DAM Dams             148 *
DaUA Dale-Urban land complex, 0 to 1 percent slopes, rarely flooded          1,580 0.3
DeDE Derby-Dougherty complex, 0 to 15 percent slopes          1,703 0.4
DerB Derby loamy fine sand, 0 to 3 percent slopes             659 0.1
DerE Derby loamy fine sand, 8 to 15 percent slopes          1,299 0.3
DleA Dale silty clay loam, 0 to 1 percent slopes, rarely flooded             374 *
DSRG Darsil-Stephenville-Rock outcrop complex, 3 to 45 percent slopes             934 0.2
DUDE Derby-Urban land-Dougherty complex, 0 to 15 percent slopes          2,222 0.5
EasA Easpur loam, 0 to 1 percent slopes, occasionally flooded          1,516 0.3
GaGA Gaddy-Gracemore complex, 0 to 1 percent slopes, frequently flooded          3,017 0.7
GcmA Gracemont silty clay, 0 to 1 percent slopes, frequently flooded, overwash          2,102 0.5
GmtA Gracemont fine sandy loam, 0 to 1 percent slopes, occasionally flooded          1,259 0.3
GraC Grainola silty clay loam, 3 to 5 percent slopes             748 0.2
GrAD Grainola-Ashport complex, 0 to 8 percent slopes          6,853 1.5
GrHC Grant-Huska complex, 1 to 5 percent slopes             214 *
GrIE Grainola-Ironmound complex, 3 to 12 percent slopes          6,478 1.4
GrPB2 Grainola-Piedmont complex, 1 to 3 percent slopes, eroded          1,242 0.3
GrPC2 Grainola-Piedmont complex, 3 to 5 percent slopes, eroded          3,784 0.8
GUIE Grainola-Urban land-Ironmound complex, 3 to 12 percent slopes          4,046 0.9
HarC Harrah fine sandy loam, 3 to 5 percent slopes        36,372 7.9
HarC2 Harrah fine sandy loam, 3 to 5 percent slopes, eroded          4,720 1.0
HarC4 Harrah fine sandy loam, 3 to 5 percent slopes, gullied             703 0.2
HarG Harrah fine sandy loam, 3 to 45 percent slopes          6,708 1.5
HaUC Harrah-Urban land complex, 3 to 5 percent slopes          3,738 0.8
HiLA Hibsaw-Lomill complex, 0 to 1 percent slopes, occasionally flooded             489 0.1
IrCE Ironmound-Coyle complex, 5 to 15 percent slopes          1,186 0.3
IrKD Ironmound-Kingfisher complex, 1 to 8 percent slopes             544 0.1
KekA Keokuk very fine sandy loam, 0 to 1 percent slopes, rarely flooded          2,297 0.5
KeoA Keokuk very fine sandy loam, 0 to 1 percent slopes, occasionally flooded          1,120 0.2
KeUA Keokuk-Urban land complex, 0 to 1 percent slopes, rarely flooded             493 0.1
KgIC Kingfisher-Ironmound complex, 1 to 5 percent slopes          1,080 0.2
KowB Konawa fine sandy loam, 1 to 3 percent slopes          2,729 0.6
KowD Konawa fine sandy loam, 3 to 8 percent slopes          3,636 0.8
KowD2 Konawa fine sandy loam, 3 to 8 percent slopes, eroded          2,698 0.6
KowD4 Konawa fine sandy loam, 3 to 8 percent slopes, gullied             503 0.1
KrdA Kirkland silt loam, 0 to 1 percent slopes          8,923 1.9
KrUA Kirkland-Urban land complex, 0 to 1 percent slopes          9,616 2.1
KUIC Kingfisher-Urban land-Ironmound complex, 1 to 5 percent slopes             412 *
KwUD Konawa-Urban land complex, 1 to 8 percent slopes          2,868 0.6
LarA Lawrie silt loam, 0 to 1 percent slopes, occasionally flooded          1,672 0.4
LatG Latrass loam, 1 to 45 percent slopes          1,408 0.3
LawA Lawrie loam, 0 to 1 percent slopes, rarely flooded             752 0.2
LitB Littleaxe fine sandy loam, 1 to 3 percent slopes          7,248 1.6
LitC Littleaxe fine sandy loam, 3 to 5 percent slopes          1,911 0.4
LitC2 Littleaxe fine sandy loam, 3 to 5 percent slopes, eroded          1,541 0.3
LomA Lomill silty clay loam, 0 to 1 percent slopes, occasionally flooded          1,085 0.2
LtUC Littleaxe-Urban land complex, 1 to 5 percent slopes          2,607 0.6
LweA Lawrie silty clay loam, 0 to 1 percent slopes, occasionally flooded             912 0.2
LwfA Lawrie fine sandy loam, 0 to 1 percent slopes, occasionally flooded          1,209 0.3
LwUA Lawrie-Urban land complex, 0 to 1 percent slopes, rarely flooded          1,970 0.4
M-W Miscellaneous water             261 *
MlfA Miller fine sandy loam, 0 to 1 percent slopes, occasionally flooded, overwash             257 *
MllA Miller silty clay, 0 to 1 percent slopes, occasionally flooded          2,189 0.5
NewB Newalla fine sandy loam, 1 to 3 percent slopes             761 0.2
NewC2 Newalla fine sandy loam, 3 to 5 percent slopes, eroded             575 0.1
NorB Norge silt loam, 1 to 3 percent slopes          2,003 0.4
NorC Norge silt loam, 3 to 5 percent slopes          1,142 0.2
NorC2 Norge silt loam, 3 to 5 percent slopes, eroded          1,235 0.3
NoUC Norge-Urban land complex, 1 to 5 percent slopes          6,689 1.5
PdHC Piedmont-Huska complex, 1 to 5 percent slopes          1,214 0.3
PieC2 Piedmont silty clay loam, 3 to 5 percent slopes, eroded             108 *
PimB Piedmont silt loam, 1 to 3 percent slopes          1,709 0.4
PimC Piedmont silt loam, 3 to 5 percent slopes          1,874 0.4
PIT Pits          1,882 0.4
PukA Pulaski fine sandy loam, 0 to 1 percent slopes, frequently flooded          1,885 0.4
PulA Pulaski fine sandy loam, 0 to 1 percent slopes, occasionally flooded          7,119 1.5
RenB Renfrow silt loam, 1 to 3 percent slopes          5,854 1.3
RinB Renthin silt loam, 1 to 3 percent slopes          5,638 1.2
RnnB Renthin silty clay loam, 1 to 3 percent slopes          2,524 0.5
RnnC2 Renthin silty clay loam, 3 to 5 percent slopes, eroded        12,425 2.7
RnUC Renthin-Urban land complex, 1 to 5 percent slopes        23,889 5.2
SDGD4 Stephenville-Darsil-Gullied land complex, 3 to 8 percent slopes          8,172 1.8
SDND Stephenville-Darsil-Newalla complex, 3 to 8 percent slopes        59,971 13.0
SDND2 Stephenville-Darsil-Newalla complex, 3 to 8 percent slopes, eroded        10,135 2.2
StDC Stephenville-Darsil complex, 1 to 5 percent slopes        24,810 5.4
StDC2 Stephenville-Darsil complex, 1 to 5 percent slopes, eroded          4,253 0.9
StLC4 Stephenville-Littleaxe complex, 1 to 5 percent slopes, gullied             376 *
SUND Stephenville-Urban land-Newalla complex, 1 to 8 percent slopes        12,351 2.7
TevD Teval loam, 3 to 8 percent slopes             507 0.1
TevD2 Teval loam, 3 to 8 percent slopes, eroded             267 *
TlrB Teller fine sandy loam, 1 to 3 percent slopes          1,356 0.3
TlrC Teller fine sandy loam, 3 to 5 percent slopes          1,404 0.3
TlrC2 Teller fine sandy loam, 3 to 5 percent slopes, eroded             819 0.2
TlrD Teller fine sandy loam, 5 to 8 percent slopes             306 *
TlUD Teller-Urban land complex, 1 to 8 percent slopes          8,306 1.8
TriA Tribbey fine sandy loam, 0 to 1 percent slopes, frequently flooded          8,523 1.9
URB Urban land        31,352 6.8
VanA Vanoss silt loam, 0 to 1 percent slopes             171 *
VanB Vanoss silt loam, 1 to 3 percent slopes             405 *
W Water          8,998 2.0
WauA Waurika silt loam, 0 to 1 percent slopes             120 *
WtgA Watonga silty clay, 0 to 1 percent slopes, rarely flooded          2,158 0.5
WuUA Watonga-Urban land complex, 0 to 1 percent slopes, rarely flooded             674 0.1
YaGA Yahola-Gaddy complex, 0 to 1 percent slopes, occasionally flooded             677 0.1
YahA Yahola fine sandy loam, 0 to 1 percent slopes, occasionally flooded          4,106 0.9
YaUA Yahola-Urban land complex, 0 to 1 percent slopes, protected          2,543 0.6
ZanB Zaneis loam, 1 to 3 percent slopes          1,127 0.2
ZanC Zaneis loam, 3 to 5 percent slopes             657 0.1
ZanC2 Zaneis loam, 3 to 5 percent slopes, eroded             536 0.1
ZaUC Zaneis-Urban land complex, 1 to 5 percent slopes             660 0.1
        459,802      99.10

 

 

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