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This section covers working with layers and other common functions.


Turning Layers On and Off and Making a Layer Active

Hopefully you've had a chance to take a look at the introduction to GIS Concepts section where we discussed layers.

A layer is visible on the map if there is a tick in the square to the left of the layer name. You can turn layers on or off by clicking in the square.

By default, some layers may be turned on and others may be turned off when you initially open the map.

In our example above, you can see that all the layers except 'Stream' are turned on. You can also see that 'Park' is 'Active' because it appears raised.

What the heck does that mean? It means that the spotlight is on this layer. In other words, this is our way of telling the computer that this is the layer we are interested in. How is this relevant, you ask?

Boy, you ask a lot of questions. Read on.


Querying Attribute Information for the Active Layer

The introduction to GIS Concepts section discussed layers and how features have attributes in a GIS.

Suppose you are interested in the name of a particular park that you have zoomed into. First, you ensure that the layer with park attributes is the active layer (see the above lesson to do this). In this case, 'Park' is made active.

Identify Tool The Identify tool allows you to get attribute information about a feature by clicking on it. You select the Identify tool to click on the feature whose attributes you want to examine.

The attributes for that feature then appear in the Identify Results Window. If they do not appear, make sure that the feature you are clicking on is part of the layer that is active.

The park name of this location is 'Winter Cove Provincial Park.'


The Inset Map

The inset, gives the main map context by showing where the map fits into the broader scheme of things. For example, if we were making a map of the Burundi, it would probably be worthwhile to include an inset showing where in Africa Burundi is situated. Sometimes the inset may cover the same area as the map itself when it first opens. However, as you zoom in and out, the inset can be very useful.

But the inset map doesn't just sit there.

Another way to navigate around the map is to use the mouse to drag a box in the Overview Map window. This box forms the new extent of the main map.

That's got to make you smile. :)


Printing a Map

Printing using the Java viewer can be problematic with some computers with the present version of.

Do not hit the 'Print' button on your Internet browser.

Instead, try the Print button on the toolbar. A single page map should be created, which you can print. If your computer asks you if you want to print all 9999 pages, say no, and send us an email.


If you have been following the tutorial; Congratulations! You are finished the really important section. Pretty painless, wasn't it?

At this point you can go look at a map and use what you just learned or you can continue on with the next section of the tutorial. This optional section will guide you through tasks like measuring distances, finding particular records, and conducting some simple queries.

I'd like to take a look at the optional section of the tutorial.


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Last Edit May 18, 2001   Comments? Contact: pjordan@dem.state.ri.us

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