Oracle's spatial capabilities are available on Oracle Database Cloud platforms and Oracle Big Data Cloud Service platforms.
On Database cloud platforms, Spatial capabilities are provided with the High Performance and Extreme Performance Packages of Oracle Database Cloud Service, and with Oracle Exadata Cloud Service. All of the spatial features of the on-premises Spatial and Graph Option are available with these cloud services. Documentation for these features is in the Spatial and Graph documentation that is part of Oracle Database 18c documentation. For information on deploying Spatial Viz component to Oracle Cloud, see blog post here.
On Big Data cloud platforms, Spatial capabilities are part of Oracle Big Data Spatial and Graph. Oracle Big Data Spatial and Graph is a feature of Oracle Big Data Cloud Service and Oracle Big Data Cloud at Customer. Here is the documentation for Big Data Spatial capabilities.