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tutorial:vectorization [2013/09/16 11:29] leoame [Clean intersections] |
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| ====== Advanced Vectorization ====== | ====== Advanced Vectorization ====== | ||
| - | This page is dedicated to give some experience based tips to achieve a better and faster work. The following topics require a good knowledge of ToolMap and its functioning. | + | This topic relate all the strategies concerning the vectorization. |
| - | The strategies proposed can spare you a lot of time, but they require the use of the shortcuts otherwise it risks to actually become longer. | + | |
| ===== Homogenized drawing ===== | ===== Homogenized drawing ===== | ||
| - | If you want your final results to be consistent you should allways draw your lines at the same scale. In addition, to get fluid results your drawing scale shall be at least 10 time bigger as the original map. By doing so you will see nice and round lines instead of sharp edged segmented ones. | + | If you want your final results to be consistent you should allways draw your lines at the same scale. In addition, to get smooth results your drawing scale shall be at least 10 time bigger as the original map. By doing so you will see nice and round lines instead of sharp edged segmented ones. |
| + | exemple: for a 1:10'000 map digitize your lines at a 1:1'000 scale | ||
| ===== Clean intersections ===== | ===== Clean intersections ===== | ||
| - | When having a enormous project the number of intersections increase fearsomely. It would be better to have a way to draw them properly without worries. For that purpose the tool [[man:edition#create_intersection|Create intersection]] is really handy. | + | When having a enormous project, the number of intersections increase fearsomely. It would be better to have a way to draw them properly without worries. For that purpose the tool [[man:edition#create_intersection|Create intersection]] is really handy. |
| - | Start with the drawing of the biggest structures. Vectorize them without interruption. By proceding like that I insure the clearness of those lines. | + | Start with the drawing of the biggest structures and vectorize them without interruption. By proceding like that you insure the clearness of those lines. I would either recommand to directly attribute those lines. |
| {{tutorial:tutorial-intersection1.png?nolink}} | {{tutorial:tutorial-intersection1.png?nolink}} | ||
| - | As you can see on the picture above, there is a lot of intersections I totally ignored. I will now draw the smaller features the same way I would do near the frame. | + | As you can see on the picture above, there is a lot of intersections totally ignored. Now draw the smaller features the same way you would do near the frame (i.e. wider than needed) and directly attribute them. Then: |
| - | => **Ctrl+i**: It automatically create the two intersections I needed. | + | => **Ctrl+I**: It automatically creates the intersections and cut the lines. |
| - | => **Shift + select**: It unselect the part I want to keep. | + | => **Shift + select**: Unselect the part you want to keep. |
| - | Now my selection is composed only by two superfluous lines which I will delete. | + | Now your selection is composed only by two superfluous lines you can delete. |
| {{tutorial:tutorial-intersection2.png?nolink}} | {{tutorial:tutorial-intersection2.png?nolink}} | ||
| + | |||
| + | As a result you have: | ||
| + | * Two intersections with very continuous lines on every sides. | ||
| + | * Insurance there isn't any snapping issues. | ||
| + | * Lesser segments to attribute.\\ Just make sure to add a new attribution on the newly created segments if needed. | ||