Original link: http://tecdat.cn/?p=8057
About QGIS
GQIS is the leading free open source geographic information system (GIS) applications. It can perform complex geographic data processing and analysis, the data can also be used to publish quality of design-driven map.
Start QGIS, you should see a screen similar to the following:
If your screen looks different, please View>Panelsselect from the top menu and check the option, as follows:
Then select View>Toolbarsand check, as shown below:
We will use the data today
seismicShapefile, which includes from the US Geological Survey in 2017, the continental United States suffered the devastating earthquake risk data.seismic_rawAs noted above, but not limited to American shores and borders.gdp_pcgpd_pc.csvgdp_pc.csvtIt includes the World Bank , 2016 world per capita GDP data, CSV files, as well as QGIS of supporting documentation to understand the data type for each field.
ne_50m_admin_0_countries_lakesIt has the world boundary data of the Earth shapefile .sf_test_addressesShapefile from our geocoded address in the first nine weeks.quakes.csvThe file is not in the folder. Instead, we will
use the US Geological Survey's Earthquake file API, we will all earthquakes since 1960, with a search size 6 km above witin6000 the geographic center of the United States occurred as. Namedquery.csvfiles should be downloaded. Renamequakes.csvand added to theweek10folder.
Draw seismic risk and seismic map
Choropleth make a map showing the seismic risk of the continental United States
选择Layer>Add Layer>Add Vector Layer...或单击此图标：
在对话框中，单击下面带有三个点的按钮，Source然后导航到文件seismic。选择带有.shp扩展名的文件很重要。然后单击Add，Close将出现以下地图，并用随机颜色填充：
在Layers左侧面板应该显示seismic层。您可以通过取消选中Layers面板中的复选框来关闭任何图层的可见性。
这些控件使您可以平移和缩放显示：
通过在Layers面板中右键单击并选择，可以将显示集中在任何图层的整个范围内Zoom to layer。
注意EPSG:4326右下角。这将定义图层的地图投影和基准。
右键单击seismic在Layers左边，选择面板Properties>Source。您应该在下面看到以下内容Coordinate reference system：
我们稍后将为地图选择另一个投影。单击Cancel或OK关闭Properties该层。
现在，我们需要sesimic通过数据中的值为图层的区域着色。右键单击Layers面板中的图层，然后选择Open Attribute Table，它对应于.dbfshapefile的：
有一个变量，ValueRange给出了2017年遭受破坏性地震的机会百分比。
关闭属性表并Properties>Symbology为该seismic图层打开。Categorized从顶部的下拉菜单中选择，这是根据分类变量的值为数据着色的选项，然后ValueRange在下选择Column。
单击Classify按钮，数据中的值将被分配随机颜色：
Please note that this range 10-12is out of order. Now click and drag the range 10-12to the right place.
Now, click Color rampthe drop-down menu, select the Create New Color Ramp, and at the next dialog box selectdirectory: ColorBrewer`:
Select ColorBrewer Redspalette, click OK, the map should look like this:
Next, we will remove black outline around the polygon. Properties>SymbologyOpen again, and then click the color square below Symbol. Simple fillIn the dialog box, select, and then change Stroke styleto No Pen:
Click on OKeach dialog box, the map should now look like this:
If you have any questions, please leave a comment below.
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[Tribe] big data to provide customized one-stop data mining and statistical analysis consultancy
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If you have any questions, please leave a comment below.
Big Data tribe - Chinese professional third-party data service providers to provide customized one-stop data mining and statistical analysis consultancy services
Statistical analysis and data mining consulting services: y0.cn/teradat (Consulting Services, please contact the official website customer service )
QQ：3025393450
QQ exchange group: 186 388 004
[Service] Scene
Research; the company outsourcing; online and offline one training; data reptile collection; academic research; report writing; market research.
[Tribe] big data to provide customized one-stop data mining and statistical analysis consultancy
Welcome to elective our R language data analysis will be mining will know the course!
Big Data tribe - Chinese professional third-party data service providers to provide customized one-stop data mining and statistical analysis consultancy services
Statistical analysis and data mining consulting services: y0.cn/teradat (Consulting Services, please contact the official website customer service )
QQ：3025393450
QQ exchange group: 186 388 004
[Service] Scene
Research; the company outsourcing; online and offline one training; data reptile collection; academic research; report writing; market research.
[Tribe] big data to provide customized one-stop data mining and statistical analysis consultancy
Welcome to elective our R language data analysis will be mining will know the course!