ODMS-Oceanographic Data Management System

FRANÇAIS

USER'S GUIDE-Spatial references

Description

This page is the most complex of the application. It allows you to select one or many zones within which you wish to obtain data.

Onglet de sélection des zones spatiales

The left of the screen shows a map of the area covered by the Québec Region. Above it appear the following five buttons:

	Activates the zoom mode. The rectangle that you draw with the mouse will enlarge the dimensions of the map while keeping approximately the same height and width proportions of your selection.
	Activates the select mode. This button allows you to select a rectangular zone without manually entering its coordinates.
	Returns the map to its original dimensions. The HOME key on your keyboard will perform the same function.
	Increases the dimensions of the map with each mouse click. The PAGEDOWN key on your keyboard will perform the same function.
	Reduces the dimensions of the map with each mouse click. The PAGEUP key on your keyboard will perform the same function.

The right side of the screen has three buttons at the lower side: Add, Edit, and Delete. These buttons are used to add, modify, or delete coordinates on the list above. This section is empty when the application is started. If you would like information on the search algorithm used, you may consult the section Notes on the algorithms.

Adding coordinates

You may add one or more rectangles in one of two ways: manually or graphically by using the mouse.

If you choose the manual method, click on the button Add. The following window opens:

Fenêtre d'édition

You enter the coordinates of the upper left and lower right corners of the rectangle. The coordinates initially present in the window are those of the entire map shown to the left. The latitudes and longitudes can be entered in either of two formats: degrees, minutes, decimal minutes with the cardinal point (ddd mm.mmm N/S/E/W), which is the format used initially, or the format decimal degrees preceded by the sign "+" or "-" (±ddd.ddd; "+" = north or west, "-" =south or east). You enter the desired position and you click Ok to confirm your choice. After confirmation, the window will close, the values will appear on the table, and the rectangle corresponding to the positions will be drawn and shaded on the map. If you want to return to the initial values, you click on Get initial coordinates. To delete the operation, you click Cancel and the window will close. You may add as many pairs of coordinates as you wish. After you have entered several positions, your map may look something like the following screen:

Fenêtre de références spatiales multiples

To enter coordinates in the graphic mode, you must first activate the select mode on the map by clicking the icon . To enter a pair of coordinates defining a rectangle, you position the mouse at one corner of the rectangle that you want to draw. While holding down the left mouse button, slide the cursor toward the opposite corner of the desired rectangle and release the mouse button. The window for adding spatial references will then appear. You click Ok to add the indicated positions. You may also modify the coordinates before finally accepting them.

Editing coordinates

To modify a line in the spatial reference list, you begin by selecting that line in the table. You then click the Edit button and the spatial reference window opens. You modify the coordinates and then accept the changes by clicking Ok. You may also perform the same function by placing the cursor above the rectangle you want to modify and clicking the right mouse button. A menu appears with the choices Edit and Delete; when you click the Edit button, the window will open to allow changes.

Deleting coordinates

In this case, you select a line to delete and then click the button Delete. A window opens, asking you to confirm the deletion, as in the following figure:

Fenêtre de confirmation de suppression

If you click Yes, the line will be deleted as well as the corresponding rectangle on the map. You may also directly delete a rectangle from the map by moving the cursor over the rectangle, clicking the right mouse button, and choosing Delete from the text box. The confirmation window will appear; you click Yes and the rectangle as well as the corresponding line in the table will be deleted.


	Reviewed: 2012-02-21