2.7.4.1. Composite polygonal items: drawing techniques

2.7.4.1.1. Draw an item that consists of one polygon and doesn't share borders with other polygons

To draw a composite polygonal item that consists of one polygon (and doesn't share borders with other items of the same type):

  1. Click the appropriate button in the toolbar.

    For example, Administrative division .

    The attribute panel for the map item opens (“Administrative division”):

    Additionally, you will see a local toolbar that contains buttons (active buttons are orange, inactive buttons are white):

    • Add/exclude existing sections mode. When this mode is active, clicking on sections of the border will either add them to the map item or exclude them from it.
    • Draw new polygon sections mode. When this mode is active, you can draw new polygon sections.
    • Snapping mode. When this mode is active, the vertexes of the new polygon will "snap" to a neighboring polygon that was drawn earlier. This mode is used if, for example, you are drawing administrative divisions that have shared borders.
    • Indicate or change center of item. This button is only found in the local toolbar for items in the “Administrative division” category. For more information, see section 3.2.3. Drawing centers of administrative divisions.
  2. Draw the item outline.

    The same rules apply to drawing both composite and simple polygons:

    1. Click on the spot where you want to start drawing your polygon. You will see a vertex which look like a circle on the map.

      The cursor will turn into a cross and you can move it to continue drawing your polygon.

    2. Move the cursor to the next point of your polygon and click to set it. A new vertex will appear at that point.

      Finish your drawing by clicking on the starting point of your polygon (the Finish option will display on your screen):



      In the middle of segments created by two consecutive vertexes, you'll see points that you can use to bend the line (see section 2.7.4.2.3. Add a vertex).

      When you click on the vertexes, a context menu opens that contains a list of operations:

      • Delete — to delete the vertex that is currently selected (the one that opened the menu).
      • Continue — to continue drawing a polygon that was previously "finished" (starting from the current point).
      • Make angle 90° — to make the selected vertex 90°.
      • Split — to split an item at the vertex that is currently selected.
      • Add new section of polygon — lets you add a new section of an outline that is part of an item. When you do this, sections that were drawn earlier are saved on the map. This feature is only used when you create items that include sections of shared border.


      The context menu commands for that specific item (see Editing techniques).

  3. Use the attribute panel to add values to item attributes (for information on attribute rules for specific categories of items, see section 3.1. General rules):

  4. Click Save to save the polygon you drew:

2.7.4.1.2. Add an internal polygon to an item

If a “mother polygon” contains a “part” that represents a different geographical or other element in the same category, but there is no defined type for the latter, then draw this “part” as an internal polygon within the “mother polygon”. See also section 2.7.2. Rules for using internal polygons.

For example, paths or clearings may be represented as internal polygons on woodlands territory (because they are items from the “Vegetation” category that don't belong to one of the types of that category).

To add an internal polygon to a polygon:

  1. Select the item on the map. The attribute panel for the map item opens:

  2. Click Edit on the panel (or use Ctrl + E). The item and attribute panel will switch to editing mode.

  3. Click Add internal polygon .

  4. Draw the internal polygon the same way you draw regular polygons, and make sure that the borders of the internal polygon don't intersect with those of the external one:

  5. Click Save to save the polygon you drew: The item will be saved as a pair of polygons (the main one and the internal one). Vegetation displays on the map as a dotted line:

2.7.4.1.3. Create an item that consists of several polygons that don't have shared sections of border

You can draw an item that consists of two or more polygons that don't share borders with other polygons in one of two ways:

  1. Draw one of the polygons and then draw the second one as part of the first item (by adding a new external polygon to the item).
  2. Draw each polygon and then join them together into one item.

2.7.4.1.3.1. Add a new external polygon to an item

To add a new external polygon to an item that was created earlier:

  1. Select the polygonal item on the map. The attribute panel for the map item opens (for example, “Administrative division”):

  2. In the attribute panel that opens, click Edit .

    The item and attribute panel will switch to editing mode:

  3. Click (Add external polygon). The toolbar will change its appearance. Click — (Draw new polygon sections mode):

  4. Draw a new external polygon:

  5. After you save the item, it will include both polygons:

2.7.4.1.3.2. Add an existing external polygon to an item

To add an external polygon that was drawn earlier to an item:

  1. Select the polygonal item on the map. The attribute panel for the map item opens (for example, “Administrative division”):

  2. In the attribute panel that opens, click Edit .

    The item and attribute panel will switch to editing mode:

  3. Click (Add external polygon).

  4. The toolbar will change its appearance.

    Click (Add/exclude existing sections mode) in the local toolbar:

  5. Select the polygon you want to add:

  6. After you save the item, it will include both polygons:

2.7.4.1.4. Duplicate shared sections of border (“snapping mode”)

When you draw or edit vegetation, hydrography, terrain, and administrative division polygonal items that share sections of border with other polygons (including with those of other categories such as woodlands and the rivers that flow within its borders), you can duplicate the shared sections of borders using “snapping” mode. This ensures that they completely coincide.

For example, you can use this technique to draw shared borders for:

  • Islands or peninsulas and reservoirs
  • Reservoirs and woodlands
  • Reservoirs and borders of localities

When you do this, the button (Snapping mode) turns to when you click.

Let's say that vegetation and hydrography items share a border but the map shows a gap between them.

We want to get rid of this gap. To do this, draw a new polygon or edit an existing one so that the borders of these neighboring items coincide.

For example, the river floodplain in the drawing caused the gap between polygons, so it should be added to the river item. When you draw and edit duplicate border sections, they snap together (and the existing polygon turns white):

When drawing (editing) overlapping border sections, they visually merge into one item and the gap between them disappears. However, this does not mean that they join to form a single item. If necessary, you can still select and edit the items separately.

If you have to draw two close polygons with a gap between them, just click Snapping mode to disable it (it appears as when deactivated).

2.7.4.1.5. Draw an item that shares several border sections with other polygons

To draw an item that shares several border sections with other polygons:

  1. Click the appropriate button in the toolbar.

    For example, Administrative division .

    The attribute panel for the map item opens (“Administrative division”):

  2. Draw a new polygon that shares several border sections with other polygons (green arrow on the drawing) and exclude border sections that were drawn earlier (and are part of polygons that were drawn earlier (blue arrows on the drawing)):

    When you move your cursor in drawing mode towards the border of a polygon that was drawn earlier, your cursor will pull towards that section. If you put your cursor on the border of the polygon, it changes colors.

  3. Click (Add/exclude existing sections mode).

    Select the section of border that you want to add to the polygonal item:

    Sections that you want add to your item may belong to several different items.

    If you click on the section that you added to the item again, it will be excluded from the item.

  4. If the new item contains several separate new sections of border, then after you draw the first one use the Add new sections of polygon command in the context menu (the Draw new polygon sections mode should be on). This way you can draw items whose borders alternate between new and previously drawn sections. For example:

  5. After you select all the border sections, assign attributes to your item. Attribute rules for specific categories of items can be found in section 3.1. General rules.

    Click Save to save the polygon you drew: