LUPMIS - GIS User Manual for Land Use Planning

4.6 Seeds

Level of expertise required for this Chapter: Expert

1. If you perform operations, which result in loss of styles, labels or attribute data (e.g. the unite file process), you have to extract this information to a seed layer. A seed layer consists of points, one for each polygon, containing the information of the polygon behind it.
Right-mouse > Live layer actions > Live layer actions window: Basic operations > Create seed points from polygons > OK and save this new point (seed) layer under a temporary file name.

2. You can now perform all sensitive operation. Don’t worry about styles, labels, attributes.

3. To regain your styles, labels, attributes, you have to reload this information from the seed layer:
Right-mouse > Live layer actions > Live layer actions window: Spatial queries > Polygons inherit attributes from seed points > OK

- - - - -

Note 1: Be aware, that ‘unseeded’ polygons will disappear.

Note 2: If a polygon has been cut, the newly ‘cut’ part might not have a seed point and therefore be deleted. If you want to avoid this, you have to add a seed point to this area.

Note 3: If two seed points occur above one polygon (either by joining two units, or by moving a seed point), the result will be unpredictable.