File Open Prev | Table of Contents | Next

When you work with overlay maps, you will be working with one or more of the following:

To open a file for an overlay map, choose Open from the File menu, and choose the appropriate item (Pointnodes, Lines, or Graphic Characteristics) from the cascading menu.

(NOTE: Open is for overlay maps only. To load base map surfaces, use the Load . . . items in the right-button menu, or GNIS in the View menu. See Getting Around for details.)

The File Open window will pop-up.

The File Open window contains the following:


To open a directory, double-click on the directory name, or single-click on the directory name and click OK or press Enter (depending upon which version of GTK+ is on your system). Alternatively, you may type the directory name into the Selection box and click OK.


Similarly, to open a file, double-click on the file name, or single-click on the file name, then click OK. Alternatively, you may type the file name into the Selection box and click OK.

Normally, the file will be loaded, and the File Open window will close.

If you do something unexpected, like attempting to open a file of the wrong type, you will get an error message such as this:

In this case, Lines were chosen from the File Open menu, but the selected file contains pointnodes.

There are lots of "unexpected" things that you might do. For instance, if you are attempting to open a file of lines, but select a file that isn't even a .shp file, you will get a message of "Unsupported Format. . .". Showing all possible error messages here would be a bit tedious, so we won't.

If you wish to open an overlay file that was created with a coordinate system that differs from the current coordinate system, you may do so.


Since you would normally open a file with the same coordinate system as the one you are using, Place-n-Time asks if you really want to do this.

Click Yes if that's what you want.

The file will be opened and its data reprojected.

(Hint: Of course the current coordinate system should be a reasonable match for the file. For instance, if the current coordinate system is UTM zone 19, reprojecting a file that was created using UTM zone 18 may be reasonable, because it will introduce minimal distortion, but reprojecting a file that was created using UTM zone 10 will introduce significant distortion.)


Copyright © 2008 by Dapper Mapper


File Open Prev | Table of Contents | Next