An example
If you start creating a JPR-file the first time, it is useful to have a real example at hand. I choose the Canadian 1:50,000 map sheet 82 J/11 "KANANASKIS LAKES" . A beautiful hiking area on the eastern edge of the Canadian Rocky Mountains, two hours drive from Calgary. For this map I created a JPR-file (and tested using Memory-map ®). You can download the grapics-file and the JPR-file (unzip file). For further documentation see JPR-files.
Be aware: The JPR-file must have the same name as the graphics-file
| JPR-file | notes |
| //Example JPR-file | Comment line |
| nm=082J11_03 | Name of the map. Isn't necessarily the filename |
| vr=0.1 | Version number of JPR-file |
| dm=NAD83 | Map datum |
| pr=UTM | Map projection |
| zn=11u | UTM-zone |
| st=0.0 | Latitude datum shift in degrees |
| sn=0.0 | Longitude datum shift in degrees |
| sc=50000 | Scale of the map. 50000 means 1:50,000 |
| sr=300 | Scan resolution of original image in pixels per Inch (PPI) |
| cu=meters | Altitude unit (contour lines) in meters |
| ci=40 | Contour line interval |
| it=png | Graphics-file type |
| rp1=50.75000,-115.50000,1171,516 rp2=50.75000,-115.00000,9488,475 rp3=50.50000,-115.00000,9547,7031 rp4=50.50000,-115.50000,1176,7071 |
Reference points on the map (latitude,
longitude, X-pixel, Y-Pixel). You must use at least 3 reference points. Start with the first reference point in the top-left corner. The other points clockwise. Beware: In the western hemisphere the sign for the longitude is - (minus). In the southern hemisphere the sign for the latitude is - (minus). |
| vp1=1171,516 vp2=5330,504 vp3=9488,475 vp4=9547,7031 vp5=5363,7059 vp6=1176,7071 |
Pixel of vertex of polygon defining the boundary
of the usable map (X-pixel, Y-Pixel). You must use at least 3 vertices. Start with the first vertex in the top-left corner. The other vertices clockwise. In the example I used three vertices because of the curved shape op the top and the bottom. |