MapInfo is a GIS (Geographical Information Systems) software available on the StatLab NT network.
- To Start MapInfo
- Click the MapInfo Icon in the Windows
- Opening, Importing, and Registering maps in MapInfo
- File>Open Table... or opens an existing MapInfo table (extension .TAB), ASCII data, spreadsheet data, or a raster image. (use the "List Files of Type" option in the Open Table dialog box to select).
- Table>Import... imports files of other selected formats (.MIF, .MBI, .DXF, ...)
- Registering a raster image to give it geographical
coordinates is a little more complex:
- If you have not already opened the (registered) map with which you would like to register the raster image, load it into a window.
- Use File>Open Table... and choose 'Raster Image' under "List Files of Type"
- Choose "Register" in the ensuing dialog box.
- The Image Registration box which follows allows you to
match points on the raster image with points on the map containing latitude and
longitude data. In order to do this, do:
- click on a point in the raster image (and confirm)
- highlight the line containing that point's information in the window above your image
- find the corresponding point on the map
- under Table>Raster, choose 'Select Control Point from Map'
- click on the matching point (and confirm)
- click the 'New' button in the Image Registration window
- repeat the above steps in this list. Note: at least four points are recommended to achieve some degree of accuracy. Registering should include points chosen from the outside edges of the image. Ideally, 'error' column values shouldn't exceed 1 or 2, but higher values will work if precision isn't a priority.
- Click 'OK"
- Your raster image should appear on top of the map.
- You can print directly from a map window or browser window using File>Print..., but for more control over the resulting page, use Window>New Layout Window
- The layout window lets you select which windows to print, allows you to add text or graphics, resize elements, add/remove borders, etc.
- Basics of Map modification
- MapInfo stores information from separate tables in separate layers.
- The Layer Control Button opens the window that lets you adjust these layers (the window can also be opened from Map>Layer Control). The example below illustrates how the layers can be adjusted.
- Sample Layer Control window and resulting map (please maximize your browser window):
- So, the capitals (WORLDCAP) are on top of the grid (GRID15), which is displayed on top of the countries (WORLD), which is on top of the OCEAN, and the Cosmetic Layer (into which I added the bike) is on top of all these (the Cosmetic Layer always is the topmost layer). Adjusting this order is possible with the 'Up' and 'Down' buttons.
- Layer control also allows the user to change settings
for each layer.
- The eye column, , indicateswhich layers are visible (the cosmetic layer is always visible).
- The pencil column, , indicateswhich layer is editable (only one layer at a time).
- The click column, , indicateswhich layers are selectable (any layer that is editable must be selectable).
- The label column, , indicateswhich layers are labeled.
- The above descriptions should help explain why the layers appear as they do in the map. It's important to note that the labels for the WORLD layer (i.e. country names) are displayed in the cosmetic layer on top of other layers (e.g. 'Columbia' on top of the star representing its capital).
- The labels and display options for a layer can be adjusted even for a layer that's locked, or not editable.
- Changing the view, or zoom, of your map
- These buttons for adjusting the view are foundin the main toolbar. It's helpful to spend a few minutes playing with and getting used to the various tools.
- The Zoom-in tool magnifiesthe area you are looking at. Note that if you click a spot with the tool, that spot will be the center of the magnified image. You can also drag a rectangle with the tool, and the magnification of the window will adjust to frame that rectangle.
- The Zoom-out tool yields awider view of the area. Again, the point clicked with the tool will be the center of the resulting image.
- The Change View button (as well as Map>Change View) opens up a dialog box that allows you to specify the zoom in terms of units of distance and/or longitude and latitude.
- The grabber tool lets youdrag the image around in the window. Try playing with it.
- If you find yourself in a view you didn't want, Map>Previous View will take you back to the view you had before.
- Map>View Entire Layer will let you see a table in its entirety (helpful since a table will sometimes open to a close-up view, and you won't know where you are).
- Available Data(click link)
- Useful MapInfo and GIS Resources
lm: June 28, 1999