Select by Polygon Back to Feature Querying and Selection Page
The Select by Polygon tool allows you to select features from layers on the map by drawing a polygon around the particular area of interest. The information is returned in the Results dialogue.
- Click on the Select by Polygon button on the toolbar. The mouse pointer becomes a crosshairs.
- Click once on the map to begin the polygon. The polygon must have at least three vertices. Double-click to finish the polygon in the appropriate place.
- The Results dialogue opens automatically and contains the results of the Select by Polygon.
- Expand the Results to see all information. Any layers with features within the selection polygon will be returned and if these are expanded the attributes of the feature belonging to the layer that was returned can be seen.
- To select any of the features so they are highlighted on the map click on the check box beside it.
- To access a context menu available on the result, right click on any of the layers returned.
This contains a number of useful tools.
- You can choose to select all of the features returned. This is useful when there are a lot of features in the result.
- Likewise you can choose to unselect all features.
- If you have one feature selected in the results you can choose to Zoom to Selected feature, which will zoom the map canvas to the particular feature selected.
- If you have some features in the results selected, choosing Toggle Features will swap the selection to those that were previously unselected.
- To remove just that particular layer from the results window (e.g. if it is not the layer of interest to you but happens to be present at the same location as the layer that does interest you) then choose the Remove option.
- The final part of the context menu refers to Send to Select by Location. The Select by Location is a further tool for selecting features on the map and contains the buffer functionality. It is always accessed using this context menu in the Results dialogue as it processes using selections made against any layer in the map. Please refer to the Search by Location tool section for more information on this tool.
- A smaller context menu can also be accessed by right-clicking on a single selected feature in a result.
The tools in this are:
Send to Select by Location, Zoom to Feature, Pan to Feature and Remove - they have the same functionality as those in the context menu for the whole layer results, except that they refer only to that single selected feature rather than all the features returned for the layer. The Pan to Feature is extra and it works by panning the map to show the selected feature instead of zooming in.
Example of using the Select by Polygon tool to highlight a building polygon:
1. Draw the polygon around the building of interest
2. Tick the box beside returned results to highlight the appropriate buidling polygon on the map canvas.
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