Credits

The courts on this site and in the app come from open data, official park lists and a scan of public aerial imagery. Thank you to everyone who maps courts on OpenStreetMap.

Maps, imagery and web listings

OpenStreetMap: © OpenStreetMap contributors. Court data is available under the Open Database License. (Open Database License (ODbL) 1.0)
USDA NAIP aerial imagery: Satellite finds were detected on National Agriculture Imagery Program photos (USDA Farm Production and Conservation Business Center), via Microsoft Planetary Computer. (Public domain)
Site and privacy context: Which site a satellite find sits on (park, school, church, ...) and the check that keeps home courts off the map use USGS PAD-US, NCES EDGE school locations, Overture Maps places and OpenStreetMap. (Public domain (USGS, NCES); CDLA-Permissive-2.0 (Overture Maps))
Park and recreation websites: Courts marked "Listed on a park website" come from the court listings on each park's own web page. (Facts from public web pages)
NCES school locations and IPEDS colleges: School and college gyms are placed at schools from the National Center for Education Statistics: EDGE school geocodes (public schools 2024-25, private schools 2023-24) and IPEDS postsecondary institutions (2025-26). (Public domain)

Official park and court lists

NYC Department of Parks and Recreation (New York): Source: NYC Parks, Athletic Facilities (NYC Open Data qnem-b8re), filtered to basketball courts and reduced to points (NYC Open Data terms (NYC Admin. Code 23-502(d)))
Seattle Parks and Recreation (Seattle): City of Seattle, Seattle Parks and Recreation (City of Seattle open data (no named license on this layer))
Chicago Park District (Chicago): Chicago Park District via City of Chicago Data Portal (Public Domain (Socrata license field))
Boston Parks and Recreation Department (Boston): City of Boston, Parks and Recreation Department (PDDL; attribution not required) (ODC PDDL 1.0)
DC Office of the Chief Technology Officer (OCTO) (Washington): Office of the Chief Technology Officer (OCTO), Government of the District of Columbia (CC BY 4.0)
City of Pittsburgh Department of Public Works (Pittsburgh): City of Pittsburgh, Department of Public Works; Western Pennsylvania Regional Data Center (CC BY)
City of Cambridge GIS (Cambridge): City of Cambridge GIS (PDDL; attribution not required) (ODC PDDL 1.0)
City of Columbus Recreation and Parks Department (Columbus): City of Columbus, Recreation and Parks Department (CC0) (CC0 1.0)
City of Cleveland, Mayor's Office of Capital Projects with Parks & Recreation (Cleveland): City of Cleveland, Mayor's Office of Capital Projects (MOCAP). ODbL: a published derived database must stay under ODbL. (ODbL 1.0 (share-alike))
City of Sioux Falls Parks and Recreation (Sioux Falls): City of Sioux Falls (CC BY 4.0)
Ramsey County, MN (County GIS) (Ramsey County (Saint Paul and suburbs)): Ramsey County, MN (No named license; metadata use constraints 'None')
San Francisco Recreation and Parks Department (San Francisco): San Francisco Recreation and Parks Department via DataSF (ODC PDDL 1.0)
City of San Jose Parks, Recreation and Neighborhood Services (San Jose): City of San Jose (CC BY)
Los Angeles County Department of Parks and Recreation (Los Angeles County (incl. City of Los Angeles)): County of Los Angeles (LA County eGIS Terms of Use (open license, no standard name))
City of Santa Ana (Santa Ana): City of Santa Ana (ODC PDDL)
City and County of Denver Department of Parks and Recreation (Denver): City of Denver Open Data Catalog (CC BY 3.0) (CC BY 3.0 (Denver Open Data Catalog))
City of Austin Parks and Recreation (Austin): City of Austin, Texas (City of Austin Open Data terms (public domain unless noted))
City of Phoenix Parks and Recreation Department (Phoenix): City of Phoenix Parks and Recreation Department (City of Phoenix Open Data Terms of Use)
City of College Station Parks and Recreation (College Station): City of College Station | Parks and Recreation Department (CC BY 4.0)
City of Tempe (Tempe): City of Tempe, AZ (CC BY 4.0)
City of Oklahoma City Parks and Recreation (Oklahoma City): This dataset is maintained by the City of Oklahoma City. (City of Oklahoma City Open Data Policy)
Rhode Island DEM / RIGIS (Rhode Island (statewide)): RIGIS; Rhode Island Department of Environmental Management (RIGIS license agreement (no named license))
Massachusetts Department of Conservation and Recreation (Massachusetts (DCR properties)): Massachusetts EEA / Department of Conservation and Recreation (Commonwealth of MA EEA/DCR terms)
Metro Nashville Parks and Recreation (Nashville-Davidson): Metro Nashville Parks / Metro Nashville Open Data (Metro Nashville Open Data terms (Executive Order FO018), no named license)
City of Raleigh Parks, Recreation and Cultural Resources (Raleigh): City of Raleigh Parks, Recreation and Cultural Resources, GIS Division (Open Raleigh terms of use (no named license; revocable))
BREC (Recreation and Park Commission for the Parish of East Baton Rouge) (Baton Rouge (East Baton Rouge Parish)): BREC (Public Domain (Socrata license field))
Lexington-Fayette Urban County Government, Parks and Recreation (Lexington): Lexington-Fayette Urban County Government (LFUCG Open Data Terms of Use (no named license))
Florida DEP Division of Recreation and Parks (Florida (statewide)): FDEP, Division of Recreation and Parks (Florida public record; FDEP GIS Data Disclaimer (no copyright asserted; redistribution contemplated))
Vermont Agency of Natural Resources / VT Forests, Parks and Recreation (Vermont (statewide)): Vermont Agency of Natural Resources, Department of Forests, Parks and Recreation (CC BY-SA) (CC BY-SA)
Nebraska Game and Parks Commission (Nebraska (state parks)): Nebraska Game and Parks Commission (No restrictions (publisher statement))
City of Manteca (Manteca): City of Manteca (CC BY 4.0)
City of San Diego Parks and Recreation Department (layer hosted by SANDAG) (San Diego): City of San Diego Parks and Recreation Department, data.sandiego.gov (PDDL) (ODC PDDL 1.0)
Mecklenburg County Park and Recreation / Mecklenburg County GIS (Charlotte / Mecklenburg County): Mecklenburg County, NC (Park and Recreation; County GIS) (Mecklenburg County GIS open data terms)
City of Jacksonville, FL (Parks, Recreation and Community Services; COJ GIS) (Jacksonville): City of Jacksonville, Florida (COJ GIS Park Assets) (Florida public record; no copyright claimable (same basis as fl_fori))
City of Sacramento Youth, Parks & Community Enrichment (Sacramento): City of Sacramento (City of Sacramento Open Data Terms of Use)

Winter (leaf-off) aerial imagery

NC OneMap / NC CGIA, NC 911 Board: Winter aerial imagery (NC) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
VGIN / VDEM Virginia Base Mapping Program: Winter aerial imagery (VA) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
State of Ohio OSIP / OGRIP: Winter aerial imagery (OH) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
Indiana Geographic Information Office: Winter aerial imagery (IN) used to find and check courts that trees hide in summer photos. (CC0)
KyFromAbove: Winter aerial imagery (KY) used to find and check courts that trees hide in summer photos. (Public domain)
Missouri Spatial Data Information Service (MSDIS): Winter aerial imagery (MO) used to find and check courts that trees hide in summer photos. (CC BY 4.0)
Arkansas GIS Office: Winter aerial imagery (AR) used to find and check courts that trees hide in summer photos. (Public domain)
Metropolitan Council / MnGeo: Winter aerial imagery (MN) used to find and check courts that trees hide in summer photos. (Public domain)
TxGIO StratMap / East Texas COG: Winter aerial imagery (TX) used to find and check courts that trees hide in summer photos. (CC0)
DRCOG Denver Regional Aerial Photography Project (DRAPP) 2022, Jefferson County: Winter aerial imagery (CO) used to find and check courts that trees hide in summer photos. (CC BY 3.0)
Oregon Statewide Imagery Program: Sharper aerial imagery (OR) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
NYS ITS Geospatial Services: Winter aerial imagery (NY) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
NYC Office of Technology and Innovation: Winter aerial imagery (NY) used to find and check courts that trees hide in summer photos. (CC BY 4.0)
PEMA via PASDA: Winter aerial imagery (PA) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
NJ Office of GIS: Winter aerial imagery (NJ) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
MassGIS: Winter aerial imagery (MA) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
CT State GIS Office / CT ECO: Winter aerial imagery (CT) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
State of Maryland (MD iMAP / DoIT): Winter aerial imagery (MD) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
State of Delaware FirstMap: Winter aerial imagery (DE) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
VCGI Vermont Imagery Program: Winter aerial imagery (VT) used to find and check courts that trees hide in summer photos. (Free public use (see terms))
URI EDC / RIGIS (RIDOT data): Winter aerial imagery (RI) used to find and check courts that trees hide in summer photos. (CC BY 4.0)
DC Office of the Chief Technology Officer: Winter aerial imagery (DC) used to find and check courts that trees hide in summer photos. (CC BY 4.0)
TDOT Aerial Surveys via TNMap (State of Tennessee): Winter aerial imagery (TN) used to find and check courts that trees hide in summer photos. (No license published (used only to find court locations))
South Carolina Revenue and Fiscal Affairs Office (2023 imagery by Kucera International, hosted by Esri): Winter aerial imagery (SC) used to find and check courts that trees hide in summer photos. (No license published (used only to find court locations))
NH GRANIT (University of New Hampshire), NH 2021-2022 6-inch orthophotography: Winter aerial imagery (NH) used to find and check courts that trees hide in summer photos. (No license published (used only to find court locations))
Maine GeoLibrary / MEGIS statewide orthoimagery program: Winter aerial imagery (ME) used to find and check courts that trees hide in summer photos. (No license published (used only to find court locations))
Iowa State University Geographic Information Systems Support and Research Facility: Winter aerial imagery (IA) used to find and check courts that trees hide in summer photos. (No license published (used only to find court locations))
Virginia notice: Any determination of topography or contours, or any depiction of physical improvements, property lines or boundaries is for general information only and shall not be used for the design, modification, or construction of improvements to real property or for flood plain determination (Virginia Code 54.1-402(C)). (VGIN / VDEM Virginia Base Mapping Program)
Maryland notice: Derived in part from State of Maryland imagery (MD iMAP / DoIT). (State of Maryland (MD iMAP / DoIT))

This website

Maps: Map tiles from OpenFreeMap (OpenMapTiles schema), drawn with MapLibre GL JS. Map data © OpenStreetMap contributors. (ODbL (data); BSD-3-Clause (MapLibre))
USDA NAIP aerial imagery: The aerial photo on each court page in the lower 48: National Agriculture Imagery Program imagery from the USDA Farm Service Agency, served by USGS The National Map. (Public domain)
USDA NAIP 2021, Hawaii and Puerto Rico: The aerial photo on court pages in Hawaii and Puerto Rico: National Agriculture Imagery Program imagery (2021) from the USDA Farm Service Agency, served by the federal GeoPlatform. Alaska has no public-domain statewide imagery, so its court pages have no photo. (Public domain)
US Census Bureau: City, town and county pages use the 2024 cartographic boundary files (places and counties); ZIP search uses the 2024 Gazetteer ZIP Code Tabulation Areas. (Public domain)