Introduction Introduction to ILWIS to ILWIS Source: Cees van - - PowerPoint PPT Presentation

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Introduction Introduction to ILWIS to ILWIS Source: Cees van - - PowerPoint PPT Presentation

Apr 19, 2023 383 likes •622 views

International Institute for Geo-Information Science and Earth Observation (ITC) Introduction Introduction to ILWIS to ILWIS Source: Cees van Westen Associated Institute of the ISL 2004 International Institute for Geo-Information Science and

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Introduction Introduction to ILWIS to ILWIS

Source: Cees van Westen

Associated Institute of the

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

What is ILWIS? What is ILWIS?

  • PC-based GIS & Remote

Sensing package

  • Developed by ITC
  • A complete package:
  • image processing
  • spatial analysis
  • digital mapping
  • Easy to learn and use:
  • full on-line help
  • extensive tutorials for direct use in

courses

  • 25 case studies of various disciplines
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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Key features (1) Key features (1)

  • Integrated raster and vector

design

  • Import and export of

widely-used data formats

  • On-screen and tablet

digitizing

  • Comprehensive set of

image processing tools

  • Orthophoto, image

georeferencing, transformation and mosaicking

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Key features (2) Key features (2)

  • Advanced modeling and

spatial analysis

  • 3D visualization with

interactive editing for

  • ptimal view finding
  • Rich projection and

coordinate system library

  • Geo-statistical

analyses, with kriging and co-kriging for improved interpolation

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Unique concepts (1) Unique concepts (1)

  • Object oriented

approach

  • data objects: raster or

vector maps and tables

  • service objects:

coordinate systems, georeference, representation, domain

– objects may be

shared: all maps of the same area use the same coordinate system

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Unique concepts (2) Unique concepts (2)

  • Domain:

defines the possible content of a map or table

in other words: what do the items in a map or table mean? Are they classes (such as landuse, soil) or values (DEM)

  • r something else?

Advantages:

  • use actual meaning of units
  • sharing of domains for different

maps and tables

  • sharing of other objects for the

same domain

  • easy calculation
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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Unique concepts (3) Unique concepts (3)

  • Dependency link is stored:

the link between data objects, derived from

  • ther data objects

maps and table which are original are called source objects, those that are made from them are called dependent objects

Advantages:

  • easy update
  • easy change of calculation

formulas

  • minimum use of disk-space
  • data retrieval without actual

calculation

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

ILWIS Beginner’s Guide Introducing the basic concepts, essential ILWIS techniques and the main ILWIS- operations. ILWIS Reference Guide Detailed description of the functionality of ILWIS including its window types, objects, operations. ILWIS User’s Guide Training the skills you need in ILWIS, including explanations and procedures for first time users in addition to topics for advanced users. ILWIS Applications Guide Advanced procedures to work with ILWIS, providing case studies for various research disciplines

Teaching Guides Teaching Guides

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Change directory Command line Change drive Menu bar Catalog Title bar Button bar Operation list Scroll bars Status line

ILWIS Main Window ILWIS Main Window

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Title bar Menu bar: always with the HELP HELP function Button bar Map Viewer Status line S ll b

ILWIS Map Window ILWIS Map Window

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Command line Record view buttons Status line Scroll bars Data viewer Title bar Menu bar Change column properties buttons

Table Window Table Window

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Pixel Information Window Pixel Information Window

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Raster maps Polygon maps Segment maps Point maps Map list Tables

Data objects: Service objects:

Domain Representation Georeference Coordinate System Map views Histogram Sample sets 2-dimensional tables Matrices Filters Functions Scripts

Special objects:

IL ILWIS WIS o

  • bject

jects

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

Domain

Defines the values, classes or identifiers that can be stored in a map or column

  • ID

for data objects that contain unique identifiers (for instance 1024, 1025,…)

  • Class for data objects that contain classes (for instance

soil units like clay, sand, loam,…)

  • Value for data objects that contain measurable values

(for instance height, concentration, …)

  • Image for satellite images and scanned images that

contain values between 0 and 255

IL ILWIS WIS o

  • bject

jects

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC) Coordinate system Point map Segment map Polygon map Attribute table Class domain Representation

Class M Class Maps

Coordinate system Point map Segment map Polygon map Attribute table Identifier domain

ID M Maps ps

Coordinate system Point m nt map Segment map Polygon map Value domain Representation Gradual or Value

Va Value M Maps

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC) Coordinate system Raster map Attribute table Class domain Representation

Class M Class Maps

Coordinate system Raster map Attribute table Identifier domain

ID M Maps ps

Georeference Georeference Coordinate system Raster map Value domain Representation Gradual or Value

Va Value M Maps

Georeference

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC) Point map Segment map Polygon map Raster map

Spatial data

Attribute table domain Class Identifier

+

Column1 Column2 Column3

Attribute data

Class domain ID domain Value domain

Class repr.

Class repr. Value repr.

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC) Domain: Landuse Input map: Landuse Rocks=iff(landuse="bare rocks", landuse, "?") Ouput map: Rocks Ouput map: Lands Bare rocks Pasture Lake Domain: lands Ouput map: Pastarea Domain: bit Pastarea = landuse = "pasture"

Water Land

Land water

Pasture Lake

Lands=iff((landuse="pasture")or(landuse="bare rocks"),"land","water")

Bare rocks 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Bare rocks

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

Map C Calcu lculat atio ion

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC) Cityblocks Landuse 001 Institutional 002 Commercial 003 Commercial 004 Residential 005 Residential 006 Residential 007 Industrial 008 Residential 009 Industrial 010 Industrial 011 Residential 012 Industrial 013 Residential 014 Residential 015 Residential Map: City blocks Attribute map: Land Use Attribute table: City blocks

Reclass Reclassifyin fying a m g a map with a th attr tribute ute d data ta

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC)

MapC = MapA +10

MapA

MapC1 = MapA + MapB

MapB

MapC2 = ((MapA - MapB)/(MapA + MapB))*100 MapC1 MapC2 MapC 5 5 2 5 5 5 6 6 2 2 6 6 2 6 2 2 4 8 4 8 4 1 1 4 4 8 1 1 8 1 8 8 15 12 16 15 15 15 15 12 12 12 12 12 16 16 16 16 9 10 7 9 9 9 9 10 10 10 3 3 7 7 14 14 11

  • 60

71 11 11 11 11

  • 60
  • 60
  • 60

33 33 71 71

  • 14 -14

Arit Arithmet etic o ic operat eratio ions

do domain va in valu lue

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC) MapB

F F F F F F F F F F F F F 6 4 7 4 4 4 4 4 4 4 7 7 7 7 7 7 7 6 6 6 6 6 6 4 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

MapD1 = (MapA = "forest") or (MapB < 500) MapD3 = (MapA = "forest") and not (MapB < 500) MapD MapD1 MapD2 MapD3

1 1 1 1 1 1

MapD = (MapA = "forest") and (MapB < 500) MapD2 = (MapA = "forest") xor (MapB < 500)

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

MapA

F = forest 7 = 700 m. 6 = 600 m. 4 = 400 m.

Lo Logical o gical operat atio ions

do domain c in class a ss and v d value lue

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ISL 2004

International Institute for Geo-Information Science and Earth Observation (ITC) MapB

F F F F F F F F F F F F F 6 4 7 4 4 4 4 4 4 4 7 7 7 7 7 7 7 6 6 6 6 6 6 4 4

MapC1 = iff ((MapA = "forest") and (MapB = 700), 1, 0)

MapC MapC1

MapC = iff ( MapA = "forest", 1, ?) MapA

F = forest 7 = 700 m. 6 = 600 m. 4 = 400 m.

1 ? ? 1 1 ? 1 1 1 1 1 1 1 ? 1 1 ? ? ? ? ? ? 1 ? ? 0 0 0 0 1 1 1 0 1 1 0 0 0 0 0 0 0

Cond

  • nditiona

nal f func uncti tions

do domain c in class a ss and v d value lue