BC Consulting

Home

  Number of maps needed
V0.0.1 - 21 October 2010

This QGIS plugin is used to create a polygon shapefile made of small polygons representing contiguous map boundaries to cover a given area.

Distributed under the GPL licence

This plugin will only fully work on QGIS 1.5 to 1.8.
It will NOT work on QGIS 2.0 and above.


What this plugin does

After selection of a layer in the QGIS legend, launch this plugin to generate a polygon shapefile made of rectangular polygons representing contiguous map boundaries that cover the layer area. It is sometimes useful to know how many sheets of paper will be needed to print a large map area at a given scale. This plugin is intended to be the first step in that process.

Once installed the bccmapcnt plugin can be found in the 'Plugins/Decorations' menu.

The plugin is called "Number of maps needed" and it is in the Decorations menus of the Plugins menu.

location of plugin

Given the lower left and upper right coordinates of a rectangular area (the bounding rectangle of the selected layer), the output scale the map will be printed at and the dimension of one sheet of paper the map will be printed on, the plugin creates a polygon shapefile with all the sheets of paper needed to cover the entire rectangular area (see example)

After the shapefile is created, you have to manually delete the polygons that are outside of your area of interest to derive the exact number of paper sheets needed to print your map (see example).

Please report any bug/problem/wish to the QGIS User mailing list [mailto: qgis - user at lists dot osgeo dot org].


Guided tour:

Main window


Example

We want to know how many paper sheets (A0) are needed to cover the area in red at an 1/100 000 scale.

area of interest

We select the layer in the QGIS legend, and launch the plugin. We tweak the numbers and click "Create Maps Shapefile".
The plugin then gives us the result below:

plugin output

And, after manually deleting the unwanted polygons (map sheets) we get the final result :

paper sheet needed

Finally, from Table Manager we learn that we need 23 paper sheets (the actual number of polygons left in the shapefile) to cover our area of interest.


New in Version 0.0.1

  • First release. Hope it is useful to someone else other that myself!