First you need to know how to obtain the result of a Dutch Dig alert. From here I use Wion Result when I refer to this result of a Dutch Dig Alert. How to obtain it is explained in About WION. After you downloaded the result you will have a zip-archive. You have to extract the contents first in a directory.
The Wion Result Viewer has three tabs, Messages,Themes and Options. The viewer, allways starts with the open tab Messages, because the first thing you have to do is open a Wion Message.
When the contents of received zip-archive is extracted to a directory,
you can use the button [Open Directory...] to select this directory
holding the Wion Result.
It is recommended to first set the default Directory in tab Options so searching starts in selected directory where Wion messages are expected to be found.
After selection and pressing [OK] this is what will happen:
Before loading, you can first extract the zipfile holding the Wion result
yourself, but you can also use the button [Open Zipfile...] or use Alt-Z.
This Function first extracts the zipfile and then loads the Wion Result in
QGIS. You should use this function only once for every Wion result, the next
time it is faster to use [Open Folder...] instead.
When the list with PDF files is filled you can select and open them using [Open file(s)]. When you select multiple PDF files or use Ctrl-A to select them all, you can also open several pdf files at once. Double clicking a file in the list of PDF files opens it directly.
You can load and work with more Wion results.
After loading another wion result, you can select this result in the list of
Wion results. After selection the list of accompanying documents is refreshed
with the ones belonging to that Wion Result.
You can use the button [Goto] or Alt-B to move the map in QGIS to the extent
of selected Wion result.
To get the best view of the Wion Result use the button [Best Scale]
or Alt-B.
Use the button [Close Message], Alt-C to close selected Wion Message.
You can store all information in Wion Result Viewer plugin in a project using the button [Save in project]. This only works when you first have created a project, use the option Save project from the File menu. Then the next time you open a project the contents of the plugin is restored.
Use the button [Quit], Alt-Q or using the [Esc]-button on your keyboard to close the Wion Result Viewer. When you open the Wion Result Viewer again you will find it in the same state as when you closed it.
After loading, all layers are visible, you can make layers invisible by
deselecting the little cross, used to mark the visibility, in front of each layer
or several layers for a whole group (for QGIS1.6.0 only from Themes tab).
It is also possible to set visibilities using the Themes tab.
The first two characters followed by an underscore of each layer indicate what kind of layer it concerns.
The tab Themes shows which Wion themes the selected Wion Result contains. It is also a legend of the map. For example the green lines are used to show the position of cables on the map that convey data. The visibility can be changed for active available themes. A theme includes the position, annotation and dimensioning of a cable/pipe. Special themes have also been added to turn on/of the visibility for all layers that contain only annotation, dimensioning, location or topo.
Use the button [Refresh] Alt-R to refresh the contents of the Themes tab. Use this button when you did not change the visibility of layers from the Wion Result Viewer, but directly in QGIS Layers panel. In that case the Themes may not correspond anymore with the actual situation in the map. A refresh can in that case be done manually.
A checkbox of a theme and a group in the layers panel can have three statusses with respect to layers belonging to that theme or group.
Question: Why is the list of PDF documents empty after opening a saved project?
Answer: Use the button Save in project to retain the state of
plugin in the project.
Question: Is it possible to load more Wion Results?
Answer: Yes you can, only when they do overlap remember that the
topography layer delivered by Kadaster (the one starting with GB_)
is not transparant. So you better move that layer to the bottom of the
list with layers.
Question: Why are In QGIS 1.6.0 the legend groups missing?
Answer: There is a problem in version 1.6.0 with adding legend groups so
they could not be used, in 1.5.0 they still are there and I expect in 1.7.0
the layer groups will also be available again.
Question: How can I load a design drawing from Autocad?
Answer: QGIS1.6.0 uses GDAL1.7.0 which allows you to load autocad dxf as
a layer.
When a directory is selected that holds no (valid) Wion result, you will get following error message:
Selected directory does not contain
result of Dutch Dig Alert or it can not be read!
In that case often there is a folder underneath selected folder that does contain a valid Wion Result.