Topographic maps
Here are links to good quality topographic maps that can be viewed online (and often downloaded).
Important note: page Maps viewers allows to enlarge the viewing zone of several mapping web sites, and also to generate automatically a calibration file for the map.
Worldwide 
The following sites provide maps, with
satellite imagery, relief contours and street maps, for the whole world:
The above sites all use the same spherical Mercator projection for the maps (as can be checked by superimposing maps with transparency using
Sautter.com). Some country-specific maps sites also use the same projection system, like
myTopo.com.
Maps from these sites can be imported into Multiplans, see
importing a map in spherical Mercator projection.
Soviet topographic maps:
United States
Maps of the U.S. Geological Survey (USGS), which cover the whole territory of the United States at scale 1:24 k, are free and can be downloaded from several sites.
- TopoQuest: dowload USGS maps at scales 1:24k, 1:100k, 1:250k + satellite imagery (geotiff format)
- MyTopo.com: browse relief-enhanced USGS maps for the United States (and Canada).
Mytopo maps can also be accessed with the following sites which display the map fullscreen:
Note that prints of maps and aerial photography can be ordered from mytopo.com (see products). This is a nice way to thank them for providing their service.
For importing a map of mytopo.com into Multiplans, see importing a map in spherical Mercator projection.
See also:
Examples:
Kings canyon National Park (referenced USGS map, scale 1:24k, size: 53 Mo)
Canada 
- MyTopo: maps of the U.S. Geological Survey, U.S. Forest Service, and NRCan for the United States and Canada.
Mytopo maps use the same spherical Mercator projection as OpenStreetMap.
- Natural Resources Canada
Australia
- Map connect: free download of topographic maps up to scale 250k (various formats available, including ECW).
- aus-emap.com: browse topographic maps up to scale 250k.
New Zealand
Norway 
Finland 
- Map Site: topographic maps and aerial images up to scale 1:25k
Italy 
Germany
United Kingdom 
- OS OpenData Ordnance Survey maps at 1:1,000,000, 1:250,000, 1:25,000 and 1:10,000 street plans. All free to download and use. Format: TIFF with TAB and TFW calibration files. Projection is OSGB transverse mercator Airy 1830 datum.
(Ordnance Survey Opendata. Contains Ordnance Survey Data ©Crown copyright and database right 2011)
Example map 1:
londonstreet.osz (15 MB) coverage: Street map of London
Example map 2:
gbminiscale.osz (28 MB) coverage: Great Britain
The above two OS maps have been converted into the OSZ format using program MAPC2MAPC.
- Peter Robins' full screen viewer
- Ordnance Survey Explore.
Get-a-map
France 
Switzerland 
- map.geo.admin.ch: free browsing of swisstopo maps at all scales. Maps can be downloaded in pdf format.
- Wanderland: topographic maps (+ layers for hiking trails, biking, ...)
- Geoportal sites of swiss cantons: VD, GE, NE, FR, JU, BE
- map.search.ch: satellite pictures and maps
Swiss Map 25 (fee): all swiss maps at a scale 1:25 k on 8 DVD discs.
Allows exportation, but exported map area is limited to size 10 km x 6.25 km (4000x2500 pixels).
Luxembourg
- Géoportail: browse maps of Luxembourg (with export option)
Spain 
Portugal
Austria
Czech Republic
Poland
Other countries
If you know of web sites (or programs) that contain topographic maps of good quality for a country or region, please send us a link so we can complete this list!
If you imported maps of a country not listed here, please drop us a line about it.
See also
Peter Robins' site contains links to many
map viewers.
I thank Toby Hawkes, Jonas Ewe, Christer Tonning and John Thorn for pointing out some links to me.
Green checks marks (

) indicate that georeferenced maps of that country have already been successfully imported into Multiplans.
Ways to assemble quickly large maps
The following methods allow to create easily large maps by assembling automatically screen captures, on both Mac and Windows computers.
Important remark: when using any of the following methods, be sure to respect the end user licence and copyright of the map.
Method 1: Extension Awesome Screenshot (windows,MacOS,linux)
A convenient way to take a screenshot of a map is to use extension
Awesome screenshot in browser
Google Chrome.
With this extension, one can take a screenshot of the
content of a page of
arbitrary dimensions (Awesome screenshot scrolls the page and assembles the screenshots automatically):
Awesome screenshot is especially useful in association with page
Map viewers, where one can open map viewers of arbitrary dimensions.
Awesome screenshot allows to crop the image before saving it. This is useful to remove unwanted white margins, if needed.
Awesome screenshot might crash occasionnaly. After a crash, select "Windows->Extensions" in Chrome and re-activate Awesome Screenshot.
This extension seems to work best when the window size is small (irrespective of the map viewer size).
Method 2: SnapToMap (windows program)
Program
SnapToMap automates the assembly of screen captures to create large maps. This program, which is compatible with many map websites, is quite easy to use.
Download:
SnapToMap (see also the link given in
this discussion (in french) on forum gpspassion)
How to use SnapToMap:
- Fill-in box (1) with any name for the map
- Fill-in box (2) with the name of the website serving the map (See menu Fichier->Charger STM... for some adresses of websites). Click on button [=>] to open a web browser (Firefox) on that address.
- Fill-in box (3) by clicking on button [L] and then on the name of the map window in Firefox.
- Click on button [GR] to define (with the mouse) the region of the window that should be captured (4).
- Choose the number of screen capture to assemble (for example a grid of 5 x 8 screen captures)
- Click on button "Démarrer" (=Start)
For some websites, SnapToMap can also write a calibration file in the OziExplorer .MAP file format (see help of SnapToMap for more explanations).
Other program: MapMaker
Program MapMaker is similar to SnapToMap. It works best in association with Internet Explorer.
Method 3: large screen shots (method working on MacOS)
Note: This method works only on "old" Macs equipped with MacOS 10.4 (Tiger) or MacOS 10.5 (Leopard). It does not work on MacOS 10.6 (Snow Leopard) or later.
On MacOS, keystroke

, followed by "space bar" brings up the camera mode. This mode allows to take screenshots of the content of a window,
even when it is located partially offscreen. By resizing the window beyond the physical bounds of the screen (both horizontally and vertically) one can often copy a large area in a single shot, avoiding the tedious job of assembling several screenshots. With this method, we can make for example a screen capture of a map of size of 10000x10000 pixels in a single shot!

Viewing a map of size 4000 x 4000 pixels using FullScreenBrowser (MacOS 10.5 in Exposé mode).
In Safari, one can enlarge the window beyond the physical size of the screen horizontally, but not vertically. To avoid this problem, one can use program
FullScreenBrowser.
FullScreenBrowser is a very basic program, with a minimalistic user interface.
To use it:
- Enter the address of the web page (for example http://topomap.co.nz) and hit the enter (or return) key
- Navigate on the map to center it around the region of interest
- Write the desired size of the window, for example 6000 x 6000 pixels, and click on button "Ajuster" (=Adjust).
- Hit key F10 (exposé mode of MacOsX) to see the map being loaded in the large window
- When the loading has finished, quit the exposé mode by hitting again the F10 key
- Take a screen shot: command+shift+4, space bar, and then click on the window to copy.