# Spatial Reference - **Website:** - **Primary alias:** `spatialreference.org` ## Description SpatialReference.org is an online catalog and reference resource for coordinate reference systems used in mapping and geospatial work. It serves geospatial professionals, GIS developers, and cartographers who need to identify, understand, and use spatial references across different applications. The site provides searchable information on a broad range of systems, including geographic references such as WGS 84 and NAD83(2011), projected systems such as UTM zones, and vertical systems such as NAVD88. It also supports EPSG codes, a widely used way to identify coordinate reference systems. Users can browse references from several authorities, including EPSG, ESRI, IAU:2015, IGNF, NKG, and OGC, or explore systems through an interactive map. Reference information is available in standardized formats such as Well-Known Text (WKT) and PROJJSON, helping users apply coordinate definitions in compatible geospatial software. The catalog presents coordinate reference systems included in PROJ and provides access to existing EPSG codes. SpatialReference.org is built using PROJ and offers a practical, centralized starting point for finding spatial reference information. ## Industries - 🗺 Reference Materials - 🗺 Maps _(under Reference Materials)_ ## Logos & icons - logo _(primary)_ — PNG — [download](https://cdn.brandfetch.io/id2yF_mvAJ/w/285/h/76/theme/dark/logo.png?c=1bxid64Mup7aczewSAYMX&t=1793744435124) ## Colors | Name | Hex | Theme | | --- | --- | --- | | Rock Blue | #99b3cc | accent | | Black | #000000 | dark | | Gallery | #eeeeee | light | ## Fonts - Verdana — asset _(custom)_ --- _Source: _ _See [/llms.txt](/llms.txt) for a full list of agent-readable pages, and [/auth.md](/auth.md) for how agents authenticate._