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Integrated Land and Water Information System (ILWIS) is a geographic information system (GIS) and remote sensing software for both vector and raster processing. Its features include digitizing, editing, analysis and display of data, and production of quality maps. ILWIS was initially developed and distributed by ITC Enschede (International Institute for Geo-Information Science and Earth Observation) in the Netherlands for use by its researchers and students. Since 1 July 2007, it has been released as free software under the terms of the GNU General Public License.^[1][2]Having been used by many students, teachers and researchers for more than two decades, ILWIS is one of the most user-friendly integrated vector and raster software programmes currently available. ILWIS has some very powerful raster analysis modules, a high-precision and flexible vector and point digitizing module, a variety of very practical tools, as well as a great variety of user guides and training modules all available for downloading. The current version is ILWIS 3.8.1.Similar to the GRASS GIS in many respects, ILWIS is currently available natively only on Microsoft Windows. However, a LinuxWine manual has been released.^[3]

• 1History

History[edit]

In late 1984, ITC was awarded a grant from the Dutch Ministry of Foreign Affairs, which led to developing a geographic information system (GIS) which could be used as a tool for land use planning and watershed management studies. By the end of 1988, a DOS version 1.0 of the Integrated Land and Water Information System (ILWIS) was released. Two years later, ILWIS was made commercial with ITC establishing a worldwide distributors network. ILWIS 2.0 for Windows was released at the end of 1996, and ILWIS 3.0 by mid-2001. On 1 January 2004, ILWIS 3.2 was released as a shareware (one-month trial offer). Since July 1, 2007, ILWIS has been distributed as an open source software under GPL license.^[4]

Release history[edit]

This table is based on [1].

Features[edit]

ILWIS uses GIS techniques that integrate image processing capabilities, a tabular database and conventional GIS characteristics.^[5]The major features include:

• Integrated raster and vector design^[6]
• On-screen digitizing
• Comprehensive set of image processing and remote sensing tools like extensive set of filters, resampling, aggregation, classifications. etc...
• Orthophoto, image georeferencing, transformation and mosaicing
• Advanced modeling and spatial data analysis
• 3D visualization^[7] with interactive zooming, rotation and panning. 'Height' information can be added from multiple types of sources and isn't limited to DEM information.
• Animations of spatial temporal data stacks with the possibility of synchronizartion between different animations.
• Rich map projection and geographic coordinate system library. Optionally custom coordinate systems and on the fly modifications can be added.
• Geostatistical analyses, with Kriging for improved interpolation^[8]
• Import and export using the GDAL/OGR library
• Advanced data management
• Stereoscopy tools - To create a stereo pair from two aerial photographs
• Transparencies at many levels (whole maps, selections, individual elements or properties) to combine different data sources in a comprehensive way.
• Various interfactive diagramming options: Profile, Cross section visualization, Hovmoller diagrams
• Interactive value dependent presentation of maps ( stretching, representation)
• Hydrologic Flow Operations
• Surface energy balance operations through the SEBS module
• GARtrip import - Map Import allows the import of GARtrip Text files with GPS data
• Spatial Multiple Criteria Evaluation (SMCE)
• Space time Cube. Interactive visualization of multiple attribute spatial temporal data.
• DEM operations including iso line generation^[9]
• Variable Threshold Computation, to help preparing a threshold map for drainage network extraction
• Horton Statistics,^[10] to calculate the number of streams, the average stream length, the average area of catchments for Strahler stream orders
• Georeference editors

Roadmap[edit]

The next major version of Ilwis will be based on the Ilwis NG framework (in development). This framework aims at being a connection hub between various heterogeneous data and processing sources (local-remote). Integrating them in a consistent way and presenting them in a unified to the end users (at both programming and user interface level). The framework will be cross platform (ILWIS is now limited to Windows only) and will be deployable on mobile devices.

See also[edit]

References[edit]

1. ^'ITC's GIS software ILWIS migrates to open source'. 2007-01-30. Archived from the original on 2007-06-21. Retrieved 2007-06-26.
2. ^'ILWIS 3.4 Open'. 52°North. 2007-03-27. Archived from the original on 2007-07-07. Retrieved 2007-07-01.
3. ^'ILWIS in Linux'. World Institute for Conservation and Environment, WICE. Retrieved 2009-11-19.
4. ^'FOSS4G 2007 : ILWIS and 52°North: From closed source to open source and interoperable image services'. Archived from the original on 2007-09-28. Retrieved 2007-07-02.
5. ^Spiteri (1997). Remote Sensing 96 Integrated Applications (1 ed.). Taylor & Francis. p. 380. ISBN90-5410-855-X.
6. ^Wim Koolhoven and Jelle Wind (1996). 'Domains in ILWIS: system knowledge about meaning of data'. Proceedings of the second joint European conference & exhibition on Geographical information, Barcelona, Spain. IOS Press. I: 77–80. ISBN90-5199-268-8. OCLC164762055.
7. ^A Partovi (2003). Suitability Study Of ASTER Data Geometry To Digitize Contour Lines In ILWIS(PDF). Master's degree thesis.
8. ^J Hendrikse (2000). 'Geostatistics in ILWIS'. International Archives of Photogrammetry and Remote Sensing. International Society for Photogrammetry and Remote Sensing.
9. ^Nag, S. K. (2000). 'Digital Elevation Modeling using ILWIS 2.1 in Parts of Purulia District, West Bengal. India'. International Archives of Photogrammetry and Remote Sensing. International Society for Photogrammetry and Remote Sensing. 33 (B$/2): 726–733. ISSN0256-1840.
10. ^Quan, N. H. 'Rainfall-runoff Modeling in the Ungauged Can Le Catchment, Saigon River Basin'(PDF).Cite journal requires |journal= (help)

External links[edit]

Ilwis 3.7 free. software download

Changes

The following features were added:

• Map Window selections: added the option to select polygons (previously only points and segments could be selected)
• Ellipsoidal Plate Carree coordinate system added
• Table Join operation: added the missing option to join a column of type Coord, making it possible to e.g. join the coordinates of a pointmap to its attribute table
• Space Time Cube: added the 3D windrose option; added XT, XY, YT lines
• Applications: added Parallax Correction of clouds for MSG images (under Image Processing), and Probability Density raster generation (frmprobabilitydensity)

Bug fixes

• Improved compatibility on computers with Intel HD Graphics or combo-graphics hardware (potential crashes when opening a Map Window). Therefore the 'Software Rendering' option in the ILWIS Preferences can be disabled for those who enabled it as a workaround.
• Restored Epipolar Stereopair functionality (both creation and viewing in the stereoscope window)
• Restored Import->ILWIS->TIFF functionality (message DATUM.DEF was not found)
• Improved stability and usability in the Import functionality for both maps and tables, and recognition of more projections (all Import methods, including ILWIS, GDAL and PostgreSQL)
• Improved stability in the Export functionality (both ILWIS and GDAL)
• Calling external commands works again (message Exit Code 1)
• Restored rectangle-based Zoom-Out functionality
• Restored No-Zoom option for raster images that maps each raster pixel to an on-screen pixel. Use the 'Global Tools->Geometry->GeoReference' tool and select the georeference that corresponds to the raster image, in order to display it unprojected.
• Improved table Window summary statistics for boolean columns and for selected records
• Improved interactive slicing application
• Solved the problem whereby the Representation Editor showed a wrong color ramp in the preview
• Solved potential crashes and wrong results in the vector operations Union and Intersect
• Solved 'vector too long' error when opening corrupted polygon maps
• Improved per-class hatching and transparency for polygon layers
• Solved potential crashes when opening 'Use As' data
• Color Composite: the application now creates 24 bits files when this option is selected (previously it was always 8 bits)
• MapGlue: gluing large images is now possible
• Open Street Map: corrected the zoom level making the labels readable, and solved potential deadlocks and crashes. Known issue: OSM may not show in 3D-view, depending on the viewing angle.
• DEM Hydro-Processing functions: solved potential 'vector too long' and 'Find Error' problems, and the menu is now arranged in the recommended workflow order.
• Maplist Statistics: solved the 'Encountered an improper argument' error so it works again
• Solved inconsistent behavior in iff statement when one of the parameters is undef (?): iff (a,b,?) is now the same as iff (not a,?,b)
• Solved crashes or empty results in copying a map to the clipboard when using WMS and Open Street Map, or when using Software Rendering
• Solved crashes and inconsistent behavior in the Cross Section, Hovmoeller and Track Profile tools
• Solved many random crashes in ILWIS

Bug fixes

• improvements in the SEBS application set
• improvements to real time animations
• improvements in the SMCE application
• improved copying of unicode string to clipboard
• removal of 2 GB limit on rasters
• improved recognition of projections from the gdal driver
• export using gdal works properly again
• solved several issues with the creation of coordinate systems
• missing edit fields on the script window (parameter tab) are accessible
• segment maps with real values as segment value are now stored correctly
• .smc files are now copied correctly
• use-as original source data is not deleted when a delete command is done on the ILWIS-proxy
• Due to some licensing issues, the triangulation code used to draw polygons was replaced.

Changes

The following new features were added:

• a break dependency option to dependent georefs (e.g. submap), for proper exporting georeferenced data
• support for opening/storing data from Postgres/Postgis databases
  • tables
  • vector maps
  • rasters
  • Use the import form to enter the location of the database as http://servername:port/databasename and use the options form for logging in.
• new application PointMapCross
• new application MapColorFromRpr
• experimental WFS support (through import form --> OGC option)
• variable DPI option when copying mapwindow to clipboard
• copy coordinate value under the mouse through the right mouse menu
• synchronization between space-time cube and animated mapwindow
• PCP (Parralel Coordinate Plot), accessible through the display options of a point layer
• time profile graph for space-time cube
• Script : Colored hill shade from a DEM

Bug fixes

• local mapwindow histogram functions again
• legend in layer tree updates properly when stretch ranges change
• map window legend updates properly when stretch ranges change
• views work again, however the (new) view system is not backward compatible with the earlier version
• legend remains at the same place when legend property form is opened
• copy view works properly again, all relevant files are also copied
• resolved conflicts between point properties by rpr and global point properties
• resolved conflicts between line properties by rpr and global line properties
• re-enabled stretching for attribute maps
• resolved raster visualization problems on low-end Intel on board graphic chip. An option in the preferences now to switch to software-based OpenGL. Although it is slower, it doesn't have the Intel chips' OpenGL problems.
• proper animation information update to mapwindow
• solved synchronization rounding bug when synchronizing animations with different index resolutions
• solved several issues in the interactive representation
• correct sorting of the columns druing table selections
• ILWIS skips corrupt polygons when reading data

Changes

New features:

• header information is added to csv/ssv files when importing
• layer tree now has user defined step and ranges in addition to the auto mode
• map window legend allows user defined step and ranges in addition to the auto mode
• legend background (if enabled) incorporates title
• new Zoom to feature(s) - now it is possible to zoom to selected features in feature maps
• rpr properties changes in mapwindow are partially copied
• a track can now be saved as a segment map and tracks can also be loaded as segment map for getting identical tracks on different maps
• labels added (again) for points and polygons

Changes

New features:

• extended selection options for vector maps and attribute tables
• ID/Unique ID maps may have their own color scheme when rendering
• new IsoCluster application

Improvements:

• improved import shape file multi shapes
• removal of import errors about coordinate system
• improved focus of drawer tools status: active/inactive
• corrected storage of user options for point symbolization
• improved map view save function
• largely increased performance for clean up/close large vector maps
• increased performance for displaying vector maps with attributes
• removed several 3D grid issues
• fixed 3D panning

Ilwis 3.4 Software Download

Changes

New features include

• access to OpenStreetMap (Internet access required) - add OSM layer to ILWIS layer
• hatching for polygons,
• Space Time Cube - tool for 3D analysis of spatial, temporal events,
• coupling of attribute table selection and map selection - selection of attribute table rows also selects corresponding feature,
• batch import (use wild cards in import names).

Bug fixes

• fixed various bugs when importing any vector file (including shape files),
• improved handling of WMS servers,
• resolved bug when importing raster file (crashed when opening the file, but was fine when ILWIS was reopened),
• resolved bug when two display tools where trying to capture the mouse at the same time,
• removed layers from the pixel info when the layer is removed from the layer tree,
• dates are now correctly read in the date form.

ILWIS 3.8 represents a major upgrade from ILWIS 3.7. Changes and improvements have mainly focussed on visualization, however, additional issues have been addressed.

Changes

Visualization

Ilwis Tutorials

• General

  • Display options form has been replaced by an extended and improved Layer tree on the left side of the map window.
  • Pixel info has a permanent location on the lower left side of the map window.
  • The map window has a command line which works the same as the main window’s command line. Maps calculated in this command line are automatically added to the map window.
  • Map window menus have been substantially reduced. Much of their functionality has been moved to the Layer tree.
  • LatLon maps can show their coordinates as decimal coordinates. This toggle can be found in the Options/Metric Coordinates menu.
  • Visualizations can be shown full screen without any UI elements. This toggle can be found in the Options/Full Screen menu.
  • Automatic reprojection and resampling is available. The map window can display maps of different geometries (both raster and vector) and will automatically morph the maps to a target geometry. The geometry of the map can be changed on-the-fly.
  • Annotation is available in the map window for legends (per layer), boundaries and scale bar.
  • The tree node 'Display Tools' has a context menu that controls the visibility of tools.
  • Base maps have been added to the system folder. This (small) set of maps can be used as background/context layers. Each base map acts as a system object.
  • Map backgrounds and surroundings can be changed with respect to color and transparency.
  • The distance measurer can be used on paths (multiple line segments) with the help of the the ctrl button.

• Layer tree

  • The previous layer tree has been massively extended. It now replaces part of the main menu. 'Tools' that control a coherent subset of visualization properties are available at all levels of the tree. They can be global or have effect on only one layer.

• 2D maps

  • Raster maps
    • Enhanced performance
    • Interactive representation value creation
  • Polygon maps
    • Enhanced performace. The first time a polygon map is shown it generates a support file (triangulation) which it uses subsequently.
    • Boundaries and Areas are separate entities with separate properties.
  • Segment maps
    • Enhanced performance. All vector maps now use a spatial indexing scheme to quickly retrieve the relation between a coordinate and its features. This speeds up the retrieval of segment values at a particular location.
  • Point maps
    • Symbolization has been completely changed. There is now one consistent system that uses small 'svg-like' text files to define the symbolization.
  • Object collections
    • An object collection of maps of the same type and domain can function as a single layer. As a result, all maps are stretched in the same way.
  • Map lists
    • Dedicated tools for map lists. Apart from animations, a set of dedicated tools has been implemented specifically for map lists.
    • Cross section. A graph can be displayed for a point location. It shows all the values of the map list for that point. Multiple points can be defined with the help of the ctrl button.
    • Hovmoeller diagram. A pattern detection representation of lines drawn on a map can be combined with a map list to produce a Hovmoeller diagram.

• Tools

  • Track profile. This displays a profile graph of a path on the map. A multi-segment path can be created with the help of the ctrl button. Multiple maps can be added to the profile graph to demonstrate relationships between the profiles of these maps.
  • Transparency. This can be added at many levels and mostly on-the-fly. Transparency follows a 0 (no transparency) to 100 (fully transparent) scale. It can be applied to the following objects/properties:
    • Layers: raster, polygon, segment, point
    • Areas and/or boundaries of polygons
    • Lines of grid
    • Extrusions (3D)
    • partial transparent interactive representation ???
    • Selections of polygon maps based on class
    • Selections of raster maps based on numerical value
  • Interactive value stretching. Dymamically adapts stretch values based on a set of sliders (min,max).
  • Attribute tool. The display attribute (column) can be changed on the fly.
  • Layer applications. All applications relevant for a certain layer type can be started from the Layer tree. Any maps produced here are immediately added to the map window.
  • Point editor and segment editor. These tools have been rewritten and are now part of the Layer tree.

• 3D Maps

  • All layers can be shown in 3D via a simple toggle.
  • Z coordinates can be any numerical value source; e.g. raster maps, attribute columns.
  • Rotation can be carried out by pressing the ctrl button and the left mouse button simultaneously, zooming via ctrl button and the mouse wheel, and panning with the ctrl button and the right mouse button.
  • All 3D properties are controlled by the 3D properties tool which is activated by the context menu of the display options node.
  • 3D grid creation is possible.
  • Tools
    • 3D properties. Controls Z-data source, scaling and offsets and the use of extrusions (and properties).

• Animations (formerly slide show)

  • Animations can be made from map lists (raster) or object collections (vector).
  • Animations function as a normal layer in the map window. Tools applicable for single layers, work for animations.
  • Animations work in 3D
  • Multiple Animations can run in one or more map windows (however, there may be performance issues).
  • Animations may use index information or real time information. Real time information is derived from a time column in a map list's attribute table.
  • Several animations may be synschronized according to index information or real time.
  • Animations can be saved as .avi files.
  • Tools
    • Highlight tool. Singles out a selection on the map to highlight during animation
    • Threshold tool. Changes display colors of pixels above and/or below a certain threshold based on an attribute table. This tool can be accessed from the animation management form.

New applications

• MapListCondense: Condenses a map list into a smaller map list, i.e. aggregates maps into one map according to a step size and specific aggregation rules.
• MapListExpand: Expands the map list and creates intermediate maps based on certain interpolation rules, i.e. the reverse of MapListCondense.
• MapListChangeDetection: Makes use of a number of simple change detection schemes to determine changes in map lists.
• MapAggregateMaplist: Aggregates a map list in a single map based on certain aggregation rules.
• TableAttributeFromMapList: Creates an attribute table for a map list based on aggregated numbers from maps in a map list
• ColumnAttributeFromMapList: Creates an attribute column for a map list based on aggregated numbers from maps in an existing map list table
• TableCreateTimeColumn: Creates a time column in a table. The time column is derived from a map list based on a (user-defined) pattern in the name of the map list.

General

• Map list and Object collection can have an attribute table. Each record matches the corresponding index in the list/collection.
• The Operation list has been extended to include a 'finder' which filters the list.
• A Spanish UI translation has been included.
• The help system has been decompiled and now uses html files instead of the bundled (chm) format.
• The domain 'time' has been included. This handles date/time information based on an ISO standard.
• ILWIS now has a server component that can run as an (ILWIS-specific) application server. A WPS server has been implemented.