# The Data Project data is organized into layers. Each layer contains data related to a specific theme. Layers are overlayed on one another to form the map that is displayed in the interface. Some layers are comprised of objects or elements that are represented using a type of geometry (points, lines, polygons) and descriptive attributes. For example, a layer can represent trees using points, and the attributes associated with them can include the species of tree, diameter, height, and state of health. Thus, each object (tree) of the layer has a geometry that is located in space and attributes that describe it. Other layers are comprised of raster data (pixels) that form images, such as aerial photographs or satellite images. Layers can be grouped hierarchically based on themes, such as urban planning, the environment, transportation, etc. A multi-level hierarchical structure makes it easier to work with projects when they contain many layers and different themes. Some layers are called **base maps** because they provide a context to display the data layers. Interaction with base maps is limited to selecting the base map to be displayed in the application. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.k2geospatial.com/en2/applications-user/jmap-ng-user-guide/the-data.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.