Geography Reference
In-Depth Information
of QGIS. The display will be zoomed so that it is contained in the
rectangle created by dragging the mouse. Clicking the map results
in a fixed zoom out.
Pan
Pans the map when you hold down the mouse and drag it.
Return to previous zoom
This should be pretty obvious, but it returns you to the previous
view. Unlike QGIS, this tool maintains a history of zoom levels,
allowing you to click your way back to where you initially started.
Zoom to
This tool is really a collection of one-shot zoom actions allowing
you to zoom to the selected map, a saved region, the current
region, and the default region. There are a couple of other choices
as well.
Query
This tool is equivalent to the identify tools we saw in uDig and
QGIS. It operates on the active layer (map) and returns informa-
tion about the layer at the location you click. For a raster this will
be the coordinates of the mouse click and the cell value. For a vec-
tor layer, it displays the coordinates as well as the attributes for
the feature.
Measure
Measures distances on the map, using the current measurement
units.
Create profile of raster map
This button actually opens another window that allows you to
draw a profile line on a raster and then plot a cross section. This
is useful for example in creating elevation cross sections from a
Digital Elevation Model (DEM).
Export display to graphics file
Exports the current map view to a graphics file. PPM/PNM, TIFF,
JPEG, and BMP are supported.
Print raster and vector maps to eps file
This tool does more than the tooltip implies. It allows you to send
the map to a printer or create a PostScript, PDF, or EPS file.
Constrain map to region geometry
This causes the map display to be constrained to the actual region
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