2. Introduction
A geographic information system (GIS), or geographical
information system captures, stores, analyzes, manages,
and presents data that is linked to location.
This work is the fruit of a field trip in Cibodas National
Park. In this presentation, we will show the use and
manipulation of a free open source GIS/remote sensing
software ILWIS (Integrated Land and Water Information
System).
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3. Objectives
To make a ground truth survey
To use a free open source GIS/remote
sensing software
Location
Cibodas National Park
4. Process
Scanned MAP
GPS
Here is the general
process for this work.
Land use
Land cover
…
4
5. Data acquisition
Handheld GPS (GPS
Map 60CS) for the
data acquisition.
Before using the
GPS, there are some
configurations to be
done.
Projection (Latlon)
Datum (WGS 1984)
Degree minute second
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6. Data acquisition
The data are recorded
not only with the GPS
but also in a sheet of
paper to make the
record easier. This
paper contains many
information such as the
location name, a global
description of the place,
GPS coordinates, code
number of photos
around the location,
the elevation, the date
and time, the weather,
the land use and land
cover, the history of the
location, the facilities
available in the area, 6
and some remarks.
7. Data acquisition
To get a more accurate
data, we wait until we
get a good signal. In
addition, we try to
minimize the Estimated
Position Error (EPE) to
less than 10 meters.
Lesser EPE means
higher accuracy for the
data acquisition.
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8. Download of data
The next step is to
download the data
from the GPS to
the computer. For
that, we use DNR
Garmin software.
GPS not connected yet
GPS connected
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10. Download of data
We delete the data that
that we do not need, and
save the rest in Shapefile
format, thus those data
can be read by Ilwis. 10
11. Download of data
Same as the waypoint, the
track also are downloaded.
We choose Shapefile format
as type of the data.
For the track, we have to
define the output shape.
We will choose LINE.
The file is finally saved in
the computer.
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12. Download of data
Before leaving DNR
- Garmin, we close
the port first. This
one means that we
end the connection
between the GPS
and the computer
(software).
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13. Map: scanned map
The data that we got was in jpg format.
ILWIS can not read this kind of format, so
we have to convert it to another format
(TIF or TIFF) that ILWIS can read. To do
so, we can use Windows feature or a
specific software.
Here, I use Adobe Photoshop. Open the
file with the software and save as TIFF
format.
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14. Start ILWIS
ILWIS for Windows is a Windows-based, integrated GIS and Remote
Sensing application consisting of:
Display of raster and multiple vector maps in map windows
Display of tables in table windows
Interactive retrieval of attribute information
Image processing facilities
Manipulation of maps in a Map Calculator
Manipulation of tables in a Table Calculator
GIS analysis tools, …
To launch the Ilwis software, just double click the ILWIS icon. The ILWIS
logo appears, followed by the ILWIS main window.
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16. Import a map
In Windows explorer, we have:
• jpg image
• tif image
3
2
4
1 Import the map (tif format)
1 2 Choose the import format to TIF
3 Choose the map (tif format)
4 Give the name of the output file
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17. Visualize a map
The raster map
cipanas appears
in the window
Double click this cipanas
icon to visualize the map.
Cipanas map
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18. Visualize a map
Not georeferenced yet
Unknown coordinate system
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19. Georeference
We create a new georeference for cipanas map
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20. Georeference
1
2
3
4 5
1 Give the georeference name
2 Give a description
We will create a new georefence 3 Choose GeoRef Tiepoints
and a new coordinate system for
Cipanas map. 4 Create Coordinate System
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5 Click ok
22. Coordinate system
Uncheck
Northern
Hemisphere
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9 Input zone 48
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10 Click ok
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23. Georeference
Select cipanas (the raster
map) as background map.
Then, click OK
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24. Georeference: editor
Creation of the georeference
Use this normal tool,
and also the zoom in
and zoom out.
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After clicking OK button, we start to create the georeference.
25. Georeference: editor
Click and input the
coordinate in each
angle of the map.
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27. Digitizing
Once we finish to create the georeference and the
coordinate system, we start to digitize the map
First, we open the
cipanas raster map by
double clicking the
cipanas icon from the
main window of ILWIS
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28. Digitizing: point map
2
1
3
4
5 1 Create the point map
6 2 Give a name to the map
3 Give a description
4 Click ok
5 Start to edit the layer
6 Choose the insert mode tool
7 7 Select the hospital in the map
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29. Digitizing: point map
1 2
After selecting
all hospitals in
the map, click 1
to save and 2 to
quit the editor
mode.
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30. Digitizing: point map
1
If we uncheck the
cipanas map (1),
we have only the
2 hospital (2).
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31. Digitizing: point map
1
We can change
the appearance
of the point by
double clicking
the hospital
layer (1) and
changing the
symbol type
and color.
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32. Digitizing: point map
We do the same for:
Building
High point
Village office
Police station
Village
Bridge
Mosque
Church
School
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33. Point map ( TTG and Cibodas point)
TTG and Cibodas
point data are
from GPS. For
these kinds of
data, we import the
data instead of
creating a new
map, like a point
map for example.
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34. Point map ( TTG and Cibodas point)
3
2
4
5
1
1 Import map
2 Choose the import format
3 Choose the gps file
4 Give name to the output
5 Click ok 34
35. Point map ( TTG and Cibodas point)
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6
6 Double click TTG icon in ILWIS main window
7 Click ok
7
8 Unknown coordinate system
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TTG points
36. Point map ( TTG and Cibodas point)
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9
12
11 We do the same
process for the
Cibodas point
9 Double click on Properties
(GPS data)
10 Choose cipanas as coordinate system
11 Click ok
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12 TTG has a coordinate system
37. Digitizing: segment map
2
1 3
4
5 1 Create the segment map
6 2 Give a name to the map
3 Give a description
7 4 Click ok
5 Start to edit the layer
6 Choose the insert mode tool
7 Trace the segment in the map by
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following the road
38. Digitizing: segment map
1 2
After tracing all
roads in the
map, click 1 to
save and 2 to
quit the editor
mode.
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39. Digitizing: segment map
1 We can change the
color of the segment by
double clicking the road
layer (1) and changing
the color.
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41. Digitizing: polygon map (create segment)
2
1 3
4
5 1 Create the segment map
6
2 Give a name to the map
3 Give a description
7 4 Click ok
5 Start to edit the layer
6 Choose the insert mode tool
7 Trace the segment in the map by
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countouring the lake
42. Digitizing: polygon map (create segment)
1 2
After countouring
all lakes in the
map, click 1 to
save and 2 to
quit the editor
mode.
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43. Digitizing: polygon map (create segment)
At first, the lakes
are still in segment
maps, so the next
step is to convert
these segment
maps to polygon
maps
SEGMENT
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44. Digitizing: polygon map (check segment)
Before polygonization,
we check first the
segments whether
1 there are:
Self overlap
Dead ends
Intersections
2
For that, we have to
edit the layer (1) and
then check the
segments (2).
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46. Digitizing: polygon map (create domain)
Once we have our
segment, we
create a domain,
which will defines,
i.e. stores, the
information that
can be available in
the map.
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47. Polygon map: polygonize
1
2
3
To polygonize the segment, we
choose the domain that we have
created for the lake (1) , and we
give a name (2) and a
description (3) for the output
polygon map.
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48. Polygon map
We do the same
process for all the
lakes, and choose the
lake corresponding to
the polygon.
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49. Polygon map
1 2 3
For our case, we do not 1 Double click the legend
need to differentiate the
2 Double click the polygon
lake, so we just make
them as the same color. 3 Choose the color 49
50. Polygon map: quit the editor
After that, click the
button exit editor.
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52. Polygon map: all polygon
We do the same for:
Village
boundaries
Settlement
Paddy field
(depending on irrigation)
Paddy field
(depending on rainfall)
Bush, shrub
Garden,
plantation
Forest
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53. Polygon map: boundaries
For a polygon, we can show
either the boundaries of the
polygon only or the whole
polygon.
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54. Polygon map: boundaries
In this case we show only the village
boundaries by checking the option 54
Boundaries Only
56. Overlay
There are 2 ways to add a layer data with another,
which means to overlay an image data with
another data type:
1) Right click on the layer 2) Select menu Layers/Add Layer…
management (on the left)
and then click Add Layer…
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58. View
We can also save the view, so that we do
not need to add any layer every time we
need to overlay.
After saving the view, the
view icon appears in the
main window of ILWIS.
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60. Layout: page setup
1 Choose the size of the paper
2 Define the orientation to Landscape
3 Click ok
1
2
3
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61. Layout: layout management
Layout management
We can see through the
layout management the
position left and top, the
size width and height, and
the scale of the map.
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62. Layout: edit
To make the layout
pretty, we will use the
features provided by
ILWIS such as:
Text
Legend
Scale bar
North Arrow
Map border
Bitmap/Picture
Box
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77. Conclusion
ILWIS Open Source is user-friendly, and it has
powerful GIS analysis tools and modules. However,
it still has some problems. One of the major
problems of ILWIS is that the software is not really
stable, and even crashes at a certain time.
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