Remove unwanted regions from map data QGIS

How do I delete part of a map in Qgis?

Let’s get started!

1. Import the spatial data to QGIS. To create a selection with an expression, first open your dataset in QGIS.
2. Creating a selection to delete information outside our area of interest. From the toolbar at the top, click on the expression icon and choose Select By Expression…
3. Export your data to Shapefile.

How do I delete part of a shapefile in Qgis?

Go to View > Select > Select Features by Rectangle (for newer version of QGIS: Edit > Select > Select Features by Polygon). Now draw a rectangle around the polygons you want to delete. To delete, choose Edit > Delete Selected.
 

How do I delete points outside a polygon in Qgis?

Selecting and deleting features while editing



If you instead want to delete the points that are outside the polygon, right-click the layer, point to Selection, then click Switch Selection. Press the DELETE key.

How do I delete a section of a polygon in Qgis?

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1. Select your layer.
2. Enabled Editing.
3. Choose the Vertex Tool (previous known as the ‘node tool’)
4. Click a point on your polygon.
5. Use Command-click & drag to select multiple points with the marquee tool. (
6. Use Delete key to delete the selected points (Fn+Delete on MacBook Pro)

How do I remove a specific element from a map?

map::erase() is a built-in function in C++ STL that is used to erase elements from the container. It can be used to erase keys and elements at any specified position or a given range. Parameters: The function accepts one mandatory parameter key which specifies the key to be erased in the map container.
 

How do you delete items from maps?

delete() method is used to delete the specified element among all the elements which are present in the map. The Map. delete() method takes the key which needs to be removed from the map, thus removes the element associated with that key and returns true.
 

How do I delete part of a shapefile?

Right-click a node on the part of the feature you want to delete and click Delete Feature Part.

How do I trim data in QGIS?

Clipper Tool

1. Verify the raster you want clipped is the Input file.
2. Click “Select…” next to the Output file, find your working folder, and name the output raster.
3. Click the radio button next to Mask layer and use the drop-down arrow to select the layer you are masking the raster tool.
4. Click OK.

How do I delete a segment in QGIS?

Quote from video:

How do I delete a segment in QGIS?

Select the road network layer in the layers panel. choose select features by polygon in the top menu bar. select all parts of the network you want be removed. Be careful, some streets might extend outside of the polygon once selected and you might removed something you did not intent to remove.
 

How do I cut a map in QGIS?

Clipper Tool

1. Verify the raster you want clipped is the Input file.
2. Click “Select…” next to the Output file, find your working folder, and name the output raster.
3. Click the radio button next to Mask layer and use the drop-down arrow to select the layer you are masking the raster tool.
4. Click OK.

How do I delete part of a shapefile?

Right-click a node on the part of the feature you want to delete and click Delete Feature Part.