Maps come in different file formats. The maps that can be imported into VanGogh contain several polygons, separated by empty lines. A polygon consists of a header with its name, a label "Polygon" and the number of points that define the polygon. The file must be simple text, separated by tabs.
The following extract is from the "Oil Dataset", file Poly.txt,
1000 | Polygon | 8 |
7.7567978 | 6.8837285 | |
7.5755286 | 6.6183047 | |
7.5302114 | 6.4855928 | |
7.3942599 | 6.3528810 | |
7.5755286 | 6.3528810 | |
7.9833837 | 6.6625423 | |
7.9833837 | 6.8394914 | |
7.7567978 | 6.8837285 | |
2000 | Polygon | 10 |
7.3942599 | 6.3528810 | |
7.5755286 | 6.3528810 | |
7.5755286 | 6.2201691 | |
... | ... |