33.1. Introduction

Raster tools allow users to analyze, to create and to process raster data.

These tools are available from the dropdown buttons bar of raster tools. Some of these tools are available in the “Tool Box” of geoprocessing. Some raster tools are also available in the contextual menu of raster layer which appears by right-clicking on the layer on the TOC and in the menu “Layer”. The tool “Information by point” is also available as a button.

Main buttons bar

Secondary buttons bar

Raster layer

Raster dataset

Multispectral raster

Enhancement

Geographic transformations

Export to raster

Tool Box

Contextual menu of layer

Menu

Let's have a look at every available tool:

Icon

Tool

Shortcut

Description

Raster properties

Ctrl+Alt+P

It allows to access to the raster properties.

Select raster layer


It allows users to enable a raster layer by clicking on it in the working area.

Histogram

Ctrl+Alt+H

It allows to consult and modify the raster histogram.

Color tables

Ctrl+Alt+T

It allows to assign color tables to a raster in a single band image.

Information by point.


It gives associated information to a pixel.

Area of interest

Ctrl+Alt+A

It allows to define regions of interest (ROIs) over a raster layer.

Generate overviews

Ctrl+Alt+O

It allows to generate pyramids. The pyramids are lower resolution versions of the original image which allow a quick load of very big images.

Analysis view


It is a tool used for a quick inspection. It has two efects. It loads the same image in the locator map and opens a new window where there is a higher zoom level and where users can see the image values in real time.

Go to the next/previous resolution level


It allows to navigate between the levels of resolution of the raster.

Create layer multifile


It creates a multifile layer.

Principal components


It allows to apply a transformation to the raster using the method of the principal components.

Tasseled cap


It allows to apply a transformation to the raster using the method of the Tasseled cap.

RGB Filters

Ctrl+Alt+F

It allows users the application of digital filters.

Radiometric enhancement

Ctrl+Alt+E

It allows the alteration of the digital levels of the image through functions to adjust them to certain process. It allows the definition of linear, piecewise linear and non-linear functions.

Mask by region of interest


It allows to generate Masks from ROIs.

Reproject layer

Ctrl+Alt+R

It allows the change to the projection of the raster layer.

Geolocalization

Ctrl+Alt+G

It allows to apply a related transformation to an image (translation, rotation and inclination) manually, no need of control points. There won't be any information about the precision.

Set projection


It sets the projection of the view to the raster.

Georeferencing


It allows to endow coordinates to an image (pixel coordinates).

Save view to georeferenced raster


It allows to export a clip view as a georeferenced raster.

Save as

Ctrl+Alt+S

It allows to save the raster as a new file.

Clipping

Ctrl+Alt+C

It allows users to make an extraction of the image.

Change data type


It allows to change the data type of the image.

Export view to image


It allows to export the View as a non georreferenced image.

The buttons bar of the raster tools has three components:

The interface of the tools varies if you access from the geoprocessing toolbox.