Quick introduction to ILWIS 3.1.pdf

ILWIS EXERCISE

Quick introduction to ILWIS 3.1

Objectives

This exercise is intended to introduce you to ILWIS 3.1, and specifically to the user

interface and some key concepts of ILWIS. It is a quick introduction based on the

chapters 1 and 2 of the ILWIS 3.0 User’s Guide .

ILWIS Main window

To start ILWIS 3.1, double-click the ILWIS icon on the desktop. After the logo,

you see the ILWIS Main window (see Figure 1). From this window you can

manage your data and start all operations and select all data.

Close button

Standard toolbar

Object selection toolbar

Maximize button

Control menu icon

Menu bar

Title bar

Minimize button

Command line

Operations/Navigator pane

Status bar

Scroll bar

Catalog

Figure 1: The ILWIS Main window.

• Have a look at the ILWIS Main window and find out what the

individual parts of the window are meant for.

! To get more information on the ILWIS Main window, press the F1 -key or open

the Help menu and select Help on this Window .

Go to section 1.1 of the ILWIS 3.0 User’s Guide if you wish to practice some

more with the individual parts of the Main window.

Before continuing with the exercises you first need to change to the subdirectory

that stores the data files for this exercise. Ask your supervisor where you can find

the dataset.

ILWIS exercise

Quick introduction to ILWIS 3.1

• Use the Navigator to browse to the correct directory.

If you have browsed to the correct directory you will see in the Main window a list

of ILWIS objects. This part of the Main window, in which maps, tables and other

ILWIS objects in the working directory are displayed each with its own type of icon,

is called a Catalog (see Figure 2).

Figure 2: Example of a Catalog of the ILWIS Main window.

ILWIS objects commonly used are:

Raster maps (for example Tmb1 )

Polygon maps (for example Cityblock )

Segment maps (for example Contour )

Point maps (for example Rainfall )

Tables (for example Rainfall )

Domains (for example Cityblock )

Representations (for example Landuse )

Coordinate systems (for example Cochabamba )

Georeferences (for example Tmgeo )

The first five objects are called data objects. They contain the actual data. The other

objects are service objects; they contain accessories that data objects need besides

the data itself.

! For a complete list of ILWIS objects and their icons, see the ILWIS Help topic

Basic concepts , ILWIS objects and icons .

• Position the mouse pointer on polygon map Landuse . A

description of this map will appear on the Status bar .

The Status bar also gives short information when you move the mouse pointer to a

menu command, to a button in the Toolbar or to an operation in the Operation-

Tree or Operation-List .

• Click in the Catalog with the right mouse button on polygon map

Landuse to get a context-sensitive menu.

A context-sensitive menu is a menu, which gives only those menu commands that

are applicable to the moment you use the right mouse button; thus you will only get

the operations, which can be applied on polygon map Landuse .

ILWIS dialog boxes

• Double-click polygon map Landuse in the Catalog . The Display

Options – Polygon Map dialog box (see Figure 3) is opened.

ILWIS exercise

Quick introduction to ILWIS 3.1

Figure 3: Example of a Display Options - Polygon Map dialog box.

A dialog box allows the user to enter the information required by ILWIS to carry out

an operation. Dialog boxes differ depending on the application you are performing.

! Read pages 14 and 15 of the ILWIS 3.0 User’s Guide or click the Help button

to get more detailed information about the Display Options - Polygon Map

dialog box.

A map window

• Accept the defaults by clicking OK . Polygon map Landuse is

displayed in a map window (see Figure 4).

A map window has many similar features as the Main window of ILWIS, which we

have seen before.

! To get more information on a map window, press the F1 -key or open the Help

menu and select Help on this Window .

• Press the left mouse button on different units in the map to find out

what they represent.

• Find the land use class around the location: X=801830 and

Y=8089283 .

Domain As you can see, the units of the Landuse map are described by classes, with names

such as Forest , Grassland , Bare rock , Lake , etc. The list of all class names

that can occur in a map is called in ILWIS a domain . A domain defines the possible

contents of a map, a table, or a column. In other words, what do the items in a map,

table or column mean? Are they classes (such as land use classes), or values or

something else? All ILWIS data objects have a domain. The four most important

types of domains are:

- Class domains for data objects that contain classes (e.g. land use units,

geomorphological units);

ILWIS exercise

Quick introduction to ILWIS 3.1

- ID domains for data objects that contain unique identifiers (e.g. city block 102 ,

rainfall station Laguna );

- Value domains for data objects that contain measured, calculated or

interpolated values (e.g. height, concentration);

- The Image domain for satellite images or scanned aerial photographs

containing values between 0 and 255.

! The domain concept is very essential in ILWIS. See the ILWIS Help topic

ILWIS Objects , Domains for more detail.

Close button

Title bar

Maximize button

Control menu icon

Menu bar

Minimize button

Toolbar

Scale box

Layer Management pane

Scroll bar

Status bar

Map viewer

Figure 4: An ILWIS map window.

• Double-click with the left mouse button a unit in the polygon map

Landuse .

Now you will see a small window appearing with the title Attributes . Inside the

window you will see two lines. The first line contains the land use class name of the

unit you clicked, and the second line contains the word Landvalue followed by a

number, which is the average monetary value of this land use type. The line with

Landvalue information is a line from an attribute table Landuse , which is linked

to the map.

A table window

• Close the Attributes window and double-click table Landuse in the

Catalog .

ILWIS exercise

Quick introduction to ILWIS 3.1

The table Landuse is now displayed in a table window (see Figure 5). As you can

see from Figure 5, a table window contains many of the features we have already

seen in the Main window and in the map window.

Close button

Toolbar

Title bar

Maximize button

Control menu icon

Column properties

button

Minimize button

Record view button

Command line

Statistics pane

Status bar

Table viewer

Split bar

Scroll bar

Figure 5: An ILWIS table window.

! To get more information on a table window, press the F1 -key or open the Help

menu and select Help on this Window or read pages 14 and 15 of the ILWIS

3.0 User’s Guide.

The table contains two columns. The left column, in gray color, has no header. If

you look closely to the names in this left column you will remember that those are

the names that you have seen in the map Landuse . This is the domain of the table.

A domain can thus define the contents of a map as well as the contents of a table.

Next to the left gray column containing the domain items, the table has one more

column, called Landvalue . This column is an attribute column that contains the

average value of the land in fictive monetary values. This column uses a Value

domain.

• Double-click the Column header with the name Landvalue on it.

The Column Properties dialog box (Figure 6) appears.

This dialog box contains information on column Landvalue .

! Click the Help button to get more detailed information about the Column

Properties dialog box.

• Click the Cancel button to close the Column Properties dialog box.

In section 1.2 of the ILWIS 3.0 User’s Guide many more options of the table

window are treated. For now, close table Landuse .

ILWIS exercise

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