Pitney Bowes MapInfo Professional - Manual (Page 80)

• Select Tools - Select objects from the seamless layer. You can only select a group of objects if they
reside in the same base table. Press the Shift key while clicking the Select Tool to do so. If you attempt
to select several objects that reside in different base tables, MapInfo Professional will only select
objects in one base table. If you use the Marquee or Radius select tools and the selected area spreads
across two different base tables, MapInfo Professional selects the table in either the center of the circle
or polygon.
• Browse Table - Display a Browser window of a particular seamless table. You are prompted to select
a base table.
Turning Seamless Layers On and Off
If you need to edit the structure of your seamless layer, you will need to turn your seamless layer off.
To turn your seamless layer off:
1. Choose Options > Show MapBasic Window. The MapBasic Window displays.
2. Type set table "tablename" seamless off. MapInfo Professional turns off the seamless layer.
3. Display the table in a Browser to view or edit its table structure. If you edit the table structure, you
will need to recompile the seamless layer.
MapInfo Professional turns off the seamless layer. Display the table in a Browser to view or edit its table
structure. Use the Seamless Table Manager to add or create seamless tables.
To turn the seamless layer on:
1. Choose Options > Show MapBasic Window. The MapBasic Window displays.
2. Type set table "tablename" seamless on. MapInfo Professional turns the seamless layer on again.
Opening a Seamless Map Layer
MapInfo Professional includes sample seamless maps or you can create your own. Some of these data
files are available on the Pitney Bowes Software Inc. web site in the MapInfo Professional Tutorial data.
We recommend you download this data for use with these examples.
From the mapinfo\tutorial\tut-usa\usa\dc\seamless directory, choose dcmetrow. A seamless map
layer of water areas in Washington DC displays. Notice at first glance that the seamless layer looks like
any other MapInfo Professional table. However, the Dcmetrow seamless map layer is made up of the
following base tables:
• VAARLIW.TAB (Arlington Virginia water areas)
• VAALEXW.TAB (Alexandria Virginia water areas)
• DCWASHW.TAB (Washington DC water areas)
To display a sample seamless map:
1. On the File menu, point to Open.
2. From the data directory, choose a seamless layer.
The following is an example of a map layer of water areas in Washington DC.
MapInfo Professional 12.5 80
Working with Seamless Layers