2.15 Define unit surrounding islands

2. GIS data entry

2.15 Define Unit Surrounding Islands

Level of expertise required for this Chapter: Intermediate; general Map Maker training

If smaller units have been digitized and then a surrounding, larger unit around these smaller islands will convert them to islands, a different procedure has to be chosen: The Subtract island action after digitizing the larger unit.

For example: Following small units have been digitized previously, which are to be surrounded by a larger unit:

The larger unit is to be digitized as a ‘normal’ polygon, therefore right-click > Action > ‘Subtract island’:

Do not forget to assign a value (for example, to the style) with the Edit-tool from the toolbar left:

Sub-Menu:

2.1 Create new layer
2.2 Digitize line
2.3 Digitize point
2.4 Digitize polygon
2.5 Edit existing layer
2.6 Delete feature
2.7 Split line
2.8 Split polygon
2.9 Merge lines from different layers
2.10 Unite lines
2.11 Snap lines
2.12 Join polygons
2.13 Extend polygon
2.14 Insert island
2.15 Define unit surrounding islands ←
2.16 Create 'doughnut'
2.17 Fill 'doughnut' polygon
2.18 Fill polygon with 'holes'
2.19 Digitize parcels from sector layout

LUPMIS - GIS User Manual for Land Use Planning

2.15 Define unit surrounding islands