![]() ![]() The symbology of a layer is its visual appearance on the map. Your output should match the contents of the Earthquakes_Checkpoint1.qgz file in the solutions folder. We have now finished the first part of this exercise. The project will be saved in the QGZ format as a file.Browse to the data directory and enter the name as Earthquakes. A new layer, large_earthquakes will be added to the Layers panel.Name the layer as large_earthquakes.gpkg. Click the … button next to File name and browse to the data directory. Right-click the significant_earthquakes_2000_2020 layer and go to Export → Save Selected Features As. We will save the selected 10 features as a new layer.This selection will be the 10 earthquakes with the high fatalities. Hold the Shift key and select the first 10 rows.This will sort the features in descending order of the values in this column. Locate the Total Deaths attribute and click twice on the column header. For our visualization, we will define the largest earthquakes like the ones that resulted in the highest number of deaths. For our map, we need another layer of 10 largest earthquakes - so we can style it differently than other earthquakes.Click the Deselect all features from the layer button. All the selected rows will be displayed on the top of the attribute table - making it easy to examine the selected features. ![]() If you want to examine their attributes, there is a handy shortcut. You will see that there are 6 selected features in the layer. Right-click on the significant_earthquakes_2000_2020 layer and select Open Attribute Table.You will now see only those points where the earthquake occurred in 2020, and its magnitude was greater than 7. Enter 7 as the Mag parameter and set the criteria as Greater than (>). You may also click the Flash Features button to see the selected records blink. You will see all earthquakes that occurred during 2020 will be highlighted in yellow. In the Select Features dialog, enter 2020 as the Year and click the Select Features button.Note: If the selection toolbar is not enabled, right-click on the toolbar panel and check Selection Toolbar. From the Selection Toolbar, click the Select Features by Value… button. We will now learn about some of the tools to query and select records.Examine all the attributes and their values. Right-click on the significant_earthquakes_2000_2020 layer and select Open Attribute Table. This layer contains over 1000 records of significant earthquakes recorded between 20. A new layer, significant_earthquakes_2000_2020 will be added to the Layers panel and displayed on the Canvas.Leave other options to their default values and click Add. In the Geometry Definition section, ensure Longitude is selected as the X Field and Latitude is selected as the Y Field. Note: Windows users may need to change the File Type as All in Choose a Delimited Text File to Open dialog to see the TSV file. In the File Format section, select Custom delimiters. This is a text file in the Tab-Separated Values (TSV) format. Select the significant_earthquakes_2000_2020.tsv file. Click on the Open Data Source Manager button again. We will now import another layer of earthquake points. This is a global layer containing lines representing all the active faults. A new layer, gem_active_faults_harmonized will be added to the Layers panel and displayed on the Canvas.Select the gem_active_faults_harmonized.gpkg file and click Open followed by Add. Click the … button next to Vector Dataset(s) and browse to the data directory.This layer contains polygons representing the land areas of the world. A new layer, ne_10m_land will be added to the Layers panel and displayed on the Canvas.In the Data Source Manager window, click Add. Select the ne_10m_land.shp file and click Open.Click the … button next to Vector Dataset(s) and browse to the data directory. Click on the Open Data Source Manager button. The first step is to import the source datasets. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |