Some Definitions


Vector Files:


A vector image is one of the two major graphic types (the other being bitmap). Vector graphics are made up of many individual objects. Each of these objects can be defined by mathematical statements and has individual properties assigned to it such as colour, fill, and outline. Vector graphics are resolution independent because they can be output to the highest quality at any scale. Software used to create vector graphics is sometimes referred to as object-based editing software. When you zoom in on the image, notice that the edges of the text are always crisp and sharp at any scale. This is why vector images are called resolution independent.


Shape Files:


There are two different forms of GIS data: raster and vector. Vector data is represented by points, lines, and polygons. A point may represent a certain elevation, a line may represent a contour, and a polygon may represent a region with the same elevation. Each vector object may have one or more attributes associated with it. For example, a single point may be linked to a table that contains a weekly water quality index. For this reason, a vector-based GIS like ArcView is useful when dealing with large databases. Raster data is organized into grids in which each cell in the grid is assigned one attribute (i.e. elevation). The size of each cell relative to the real world is indicated by the resolution of the data layer.


Adding Files


To add files you will need to create a folder within your system hierarchy. While a folder can be placed anywhere it is advisable to place it alongside your BaseClm and Patterns folders. Typically the path to these folders is:


C:\Program Files\CLIMsystems\SimCLIM\Data\


After creating the folder you can add you shape and vector files to it. You must shape and vector files that correspond in terms of their latitude and longitude for the areas within yourIn this activity you will generate a set of scenario options and view some of them within the SimCLIM 4.x for Desktop software system otherwise they will not work. Contact CLIMsystems for assistance if you encounter difficulties using these sorts of files.


Displaying Files


When you have a spatial output open for which you wish to add additional information (derived from shape and vector files) click on the overlap vector and shape file tool from the toolbar at the top .


A new dialogue box will be displayed. If no shape or vector files are displayed you will need to browse to them by clicking on the browse button in the lower right of the dialogue box.



Once you have browsed to the files when you return to the overlay tool the files should be displayed (i.e. you should not have to browse to them each time you use the tool). Click on the overlay you desire and choose a colour for display and click on Overlay. Your shape or vector file should be displayed on your image. Try this with several files so that you become familiar with the options.