Maps and GPS - Map sources (additional information)

About this page Additional information

On this page you will find additional information about topographic maps of some specific countries, found on the Internet. I gathered this information by trial and error, preparing my GPS for projects.

(Last modified: May 23, 2020; last checked: May 23, 2020)

Danish maps

The site Kortforsyningen/Download offers all kind of maps. But before you can download maps you must register. The maps (254 pixel per inch) are based on UTM grid zone 32. The GeoTIFF-files don't load in Memory-Map. The names of the files are based on the UTM coordinate of the bottom left corner of the map. You can retrieve the calibration data form the GeoTIFF-files.

The parameters I used in the JPR-files:
dm=WGS84
pr=UTM
st=0.0
sn=0.0

Experience: The maps with scale 1:25,000 are nice walking maps. The 1:100,000 maps  are good road maps in the country site, in urban areas you need ad leased the 1:50,000 maps. 

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French maps

The site http://www.geoportail.gouv.fr/carte offers all kind of maps. To select a topographical map click in the top left corner on "CARTES", choose "Actualit├ęs" and click on "Voir tous les fonds de cartes". Now you can select the map you need. The map I like most to plan walks is "Carte topographique IGN" (scale 1:17055) and to plan a "stroll" by car "Carte IGN classiques" (scale1:68.220). To extract the map information use Firefox in the Responsive Design-modus (button combination CTRL + SHIFT + M). The size 2500 by 2500 pixel works fine. The scale 1:17055 is about 300 pixel per km. For me it is an equivalent for scale 1:33.333 based on 254 pixel per inch (100 per cm). I translated the scale 1:68.220 in to 1:100.000 based on 190 pixel per inch (75 per cm). To calibrate my maps I used initially Memory-map, than corrected and added some information to the JPR-file. I had the best results using the geographical coordinate of an elevation dot in each of the corners of my map and adding the "Mercator" projection to my JPR-file. You can "activate" these coordinates in the utility menu at the right side of the map screen.

The parameters I used in the JPR-files:
dm=WGS84
pr=Mercator
p1=0
st=0.0
sn=0.0

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Dutch maps

The site Basisregistratie Topografie - Download offers all kind of raster (GeoTIFF) maps form 1:25,000 to 1:500,000. The graphical resolution is 200 pixel per cm (508 pixel per inch). They can be resized to a resolution of 100 pixel per cm without any real loss of information (form my own experience). The GeoTIFF maps don't load in Memory-Map. You can retrieve the calibration data form the GeoTIFF-files.

The parameters I used in the JPR-files and worked fine (although the map projection (pr=UTM)  isn't correct):
dm=WGS84
pr=UTM
st=0.0
sn=0.0

Experience: The maps with scale 1:25,000 are nice walking maps. The 1:100,000 maps  are good road maps in the country site, in urban areas you need ad leased the 1:50,000 maps. 

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Swedish maps

This site (Sveriges Lanskarta) offers an online map suitable to extract information to create maps form form 1:25,000 to 1:500,000. If you have a good look, you will see faint lined. These lines mark squares 10 by 10 km, based on SWEREF99 TM (=  ETRS89/UTM zone 33). To view the coordinates (for calibration): "Verktyg" > "Koordinater".

The parameters I used in the JPR-files:
dm=WGS84
pr=UTM
st=0.0
sn=0.0

Experience: Zooming in to the level with the scale bar 0.4 km You can extract a map with scale 1:40,000 base on 254 pixel per inch. A nice walking map. Zooming in to the level with the scale bar 2 km you can extract a map with scale 1:160,000 base on 254 pixel per inch. A good map for cruising the country site. For urban areas you need ad leased the 1 km map.  On my webpage Memory-Map related downloads you will find the Memory-Map grid definition for the Swedish coordinate system.

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Swiss maps

This site (map.geo.admin.ch) offers an online map suitable to extract information to create maps form form 1:25,000 to 1:500,000 based on 254 pixel per inch.

Looking in the http-address bar you will see a X (Northing) and a Y (Easting) coordinate. These coordinates are based on the Swiss map grid (CH1903/LV03) and points exactly to the center of the webpage. By changing these coordinates, you can move (alternatively) the map to your preferred area. For extracting tiles I use Firefox in the Responsive Design-modus (button combination CTRL + SHIFT + M) with a window size 4300 x 4300 pixels and cut these images to 4000 x 4000 pixels. On my webpage Memory-Map related downloads you will find the Memory-Map grid definition for the Swiss coordinate systems.

The parameters I used in the JPR-files and worked fine (although the map projection (pr=UTM) isn't correct):
dm=WGS84
pr=UTM
st=0.0
sn=0.0

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Mobile Atlas Creator (under construction)

Mobile Atlas Creator is an open source (GPL) program which creates off line atlases. Although the program doesn't support Memory-Map or Fugawi, you can use the program to created maps in PNG format with a OziExplorer MAP-file (with calibration data). These calibration data can be used to create a JPR-file (projection: Mercator, datum: WGS84). Before you can use the map, you have to reduce the colour depth to 8 bit (256 colors).

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