GIS Layer List
Aerial Photography
| Layer | Description |
|---|---|
| 1950 | Countywide – black and white |
| 1966 | Countywide – black and white |
| 1970 | Countywide – black and white |
| 1980 | Countywide – black and white |
| 1985 | Countywide – black and white |
| 1990 | Countywide – black and white |
| 1995 | Countywide – black and white |
Orthophotography
| Layer | Description |
|---|---|
| 2000 | Countywide – 6″ pixels in urban areas and 9″ pixels in rural areas |
| 2002 | Southeast Quadrant (Genoa, Brighton, Green Oak & Hamburg Townships and Brighton City) – true color – 6″ pixels |
| 2003 | Northeast Quadrant (Tyrone, Deerfield, Hartland, & Oceola Townships) – true color – 6″ pixels |
| 2005 | Countywide – true color – 6″ pixels |
| 2008 | Countywide – true color – 12″ pixels |
| 2010 | Countywide – true color – 12″ pixels |
| 2015 | Countywide – true color – 6″ pixels |
Election Geography
| Layer | Description |
|---|---|
| Commissioner Districts | County Commissioner representation as determined by 2011 Apportionment Committee |
| Library Districts | Areas included in district library charters; usually based on school districts |
| School Districts | Area included in each school district; created based on school district codes assigned to tax parcels |
| Intermediate School Districts | County ISD as determined by school district |
| Polling Locations | Facilities used for voting |
| Voting Precincts | Areas included in each precinct as determined by the local clerk |
| Zip Codes | General area included in each US Postal Service zip code based on the property zip code assigned to each parcel |
| US Congressional Districts | Areas included in the district that elects representatives to the US House of Representatives legislative district |
| State House of Representatives Districts | Areas included in the district that elects representatives State House of Representatives legislative district |
| State Senate Districts | Areas included in the district that elects representatives to the State Senate |
Land Management
| Layer | Description |
|---|---|
| Section Lines | Public Land Survey Sections |
| Municipal Boundary | Outline of each community, including annexations |
| Parcels | Tax parcel polygons as described by the local unit assessor’s property description |
| Parcel Dimensions | Property boundary line distances |
| Subdivisions / Condominiums | Outline of each subdivision and condominium as described by the registered plat or master deed. |
Hydrology
| Layer | Description |
|---|---|
| Lakes | Open water polygons digitized from 2000 orthophotography |
| Rivers / Drains | Open water lines digitized from 2000 orthophotography |
| Flood Risk Zones | Derived from FEMA FIRM maps that are used for floodplain management |
Transportation
| Layer | Description |
|---|---|
| Road Centerline | Road centerline as digitized from orthophotography and new development site plans |
| Railroads | Railroad centerline digitized from orthophotography |
| Mile Markers | Location of each highway mile marker captured with GPS |
| Airports | Points showing location of each airport, airstrip, and heliport |
Natural Resources
| Layer | Description |
|---|---|
| Natural Features Inventory | Study conducted by the Planning Department to prioritize open space areas |
| Park & Recreation Areas | Outline of each park & recreation area based on the parcel layer |
| Soils | Originally obtained from the State of Michigan |
| Elevation Contours | 5′ Elevation contours derived from orthophotography; not field verified 2′ Elevation contours derived from LIDAR; not field verified |
Points of Interest
| Layer | Description |
|---|---|
| Apartment Complex | Apartment Complexes |
| Cemetery | Location of cemeteries listed in a variety of historical sources |
| Church | Location of churches listed in phone book |
| Government Office Building | State, county and local government offices |
| Hospital | Hospitals with or without emergency care |
| Library | Location of each library |
| Lodging | Hotels and motels |
| Manufactured Home Community | Manufactured housing communities |
| Post Office | Location of each post office |
| Recreation Activity | Golf courses, ski hill, skate parks, etc. |
| Retail Store | Commercial/retail buildings and large retail centers |
| School | Location of each school building and school board offices |
| Tower | Tall structures including cell towers, water towers, antennas, etc. |
| Unincorporated Place | Also called Census Designated Places |
| Weather Sirens | Location of weather sirens (some captured with GPS) |