QGIS mapping: vector data mapping process and export

1. Load data

open QGIS after , Load the required data , Take the data of Henan Province as an example . You can load data by dragging directly , You can also choose... In the menu bar “ Layers ”—》“ Add layers ”—》“ Add vector layer ” Add data , Or use shortcut keys shift + ctrl + v Open the add data page to add .

2. Symbolization

Double click the layer loaded with the data , Or right click properties , Select symbolization on the attribute management page , Then select... At the top of the symbolic page “ classification ”.

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And then in “ value ” Choose here name name , It can be changed as needed , Click the button again “ classification ”, You can see that each administrative region is classified by name .

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Then click on “ Symbol ”, Adjust transparency and other related parameters , Here the transparency is set to 70%.

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The result after setting is shown in the figure ：

3. Add labels

Double click the loaded layer , choice “ mark ”, choice “ Single dimension ”, Set the values of dimensions and related parameters of styles , Here's the picture .

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After setting the annotation, the result is shown in the following figure ：

4. New print layout

Choose... From the menu bar “ engineering ”, And then choose New print layout , Then name the new layout

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A new interface will pop up , For the new print layout , choice Add map , Provide a canvas like page for the content to be drawn , Here's the picture .

At this point, the map is automatically loaded into the new page

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Generally, you need to add a base map for the map , You can choose Gaode map as the base map , About QGIS How to add online map content can be viewed ：QGIS Load online map in
After loading the base map , The new print layout will automatically add the online map , as follows , Here, the map of Gaode is used as the base map ：

5. Add compass 、 Scale and other components

Select... On the menu bar Add item , Add compass 、 Scale and other components

Compass

You can set the north arrow style 、 Size equal parameter

scale

legend

6. Export map

In the menu bar Layout Choose from Export to image

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Set the resolution of the exported image , It's usually 300dpi, Higher requirements can be set to 600dpi.

After export ：

The above is a mapping of vector data , We will update about using QGIS Contents of grid mapping .QGIS comparison ArcGIS Lighter weight , And the drawing function will be a little more , The main thing is Open source .