Data

JMap NG projects can contain two types of data: spatial data and non-spatial data.

Spatial Data

Spatial data is organized into map layers. Each layer contains data on a particular theme. These layers are overlayed to form the map displayed in the interface.

Types of Cartographic Layers

Vector Layers

Composed of features represented by geometries (points, lines, polygons) and descriptive attributes.

Example: A tree layer represented by points, with attributes such as species, diameter, height, and health status. Each tree thus has a geographic position and characteristics that describe it.

Raster Layers

Composed of matrix data (pixels) forming images: aerial photographs, satellite images, digital terrain models, etc.

Hierarchical Organization

Layers can be grouped hierarchically by theme: urban planning, environment, transport, etc. This multi-level structure facilitates navigation when projects contain numerous layers.

Base Maps

Base maps provide a visual context for presenting your data. Your interaction is limited to selecting which base map to display.

Non-Spatial Data

Non-spatial data in the project is organized into tables. This tabular data can be linked to map layers or be completely independent.

A table contains rows (records) and columns (fields or descriptive attributes).