### How to manipulate data?

In TerraView data can come from different data sources from where datasets can be selected and added to a project becoming a project layer. A layer is then manipulated inside the application. Several tools are available to manipulate data sources, datasets and layers. This session aims is to give a quick index to the most used tools grouped by its functionalities.

#### Tools to add/update/remove data sources and select its datasets:

- Data Source Selector

- Dataset Selector

#### Tools to exchange data between data sources:

- Data Source Exchanger

- Layer Exchanger

#### Tools operating over a Layer:

- Classification

- Charts

- Pie Bar

#### Tools operating on data table:

- Data Table

#### Tools to set or change the spatial reference system of a Layer or Map Display:

- Spatial Reference System

It also worth mention the different ways to obtain a layer and add it to the application. A layer can represent the whole content of a dataset stored in a data source, can be a query result, and also can be generated from a tabular file (with or without geometry). The details are given in the links bellow:

- Dataset Layer (From Data Source)

- Query Dataset

- Tabular File

When a layer is added directly from a directory of vector or raster files, a new datasource is added to the list of Data Sources available with the same name of the layer. Check all ways to add a layer in Project Menu.