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Spatial Analysis in QGIS

Spatial Analysis in QGIS. Jeff Davids TU Delft | S4W | H2oTech. Outline. Spatial Analysis - Vector Data in QGIS Spatial Analysis - Field Calculator Questions and Discussion. Source: Susan Steele-Dunne, TU Delft CIE5401, Spatial Tools in Water Resources Management. Outline.

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Spatial Analysis in QGIS

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  1. Spatial Analysis in QGIS Jeff Davids TU Delft | S4W | H2oTech

  2. Outline • Spatial Analysis - Vector Data in QGIS • Spatial Analysis - Field Calculator • Questions and Discussion Source: Susan Steele-Dunne, TU Delft CIE5401, Spatial Tools in Water Resources Management

  3. Outline • Spatial Analysis - Vector Data in QGIS • Spatial Analysis - Field Calculator • Questions and Discussion

  4. Vector Data in QGIS - Research Tools

  5. Vector Data in QGIS - Research Tools • Random water quality sampling • Afghan settlements within Kabul district • Vector grid for print composition • Ideal observation network

  6. Vector Data in QGIS - Geoprocessing Tools

  7. Vector Data in QGIS - Geoprocessing Tools Source: Susan Steele-Dunne, TU Delft CIE5401, Spatial Tools in Water Resources Management

  8. Vector Data in QGIS - Geoprocessing Tools Source: Susan Steele-Dunne, TU Delft CIE5401, Spatial Tools in Water Resources Management

  9. Vector Data in QGIS - Geoprocessing Tools Source: Susan Steele-Dunne, TU Delft CIE5401, Spatial Tools in Water Resources Management

  10. Vector Data in QGIS - Geoprocessing Tools Source: Susan Steele-Dunne, TU Delft CIE5401, Spatial Tools in Water Resources Management

  11. Vector Data in QGIS - Geoprocessing Tools Source: Susan Steele-Dunne, TU Delft CIE5401, Spatial Tools in Water Resources Management

  12. Vector Data in QGIS - Geoprocessing Tools Source: Susan Steele-Dunne, TU Delft CIE5401, Spatial Tools in Water Resources Management

  13. Vector Data in QGIS - Geoprocessing Tools • Determine areas of different land uses within different watersheds • Identify groundwater contaminant buffer space • Remember that units are defined by the Coordinate Reference System (CRS) • Clip stream network to watershed of interest • Quantify irrigable land within 5 km of a stream

  14. Spatial Analysis - Vector Data in QGIS

  15. Vector Data in QGIS - Geometry Tools • Determining sampling locations • Develop network connectivity • Perform precipitation analysis

  16. Vector Data in QGIS - Geometry Tools Source: Susan Steele-Dunne, TU Delft CIE5401, Spatial Tools in Water Resources Management

  17. Vector Data in QGIS - Analysis Tools

  18. Vector Data in QGIS - Analysis Tools • Determine number of stream gauges in watersheds • Calculate center of mass of a number of monitoring points

  19. Vector Data in QGIS - Data Management Tools

  20. Vector Data in QGIS - Data Management Tools • Add attributes of one feature to another • Modify CRS of different layers • Merge individual vector files into one file

  21. Outline • Spatial Analysis - Vector Data in QGIS • Spatial Analysis - Field Calculator • Questions and Discussion

  22. Vector Data in QGIS - Field Calculator • Used to create new or virtual field in attribute table of feature • Can be based one or more functions • Add area to Afghanistan_Districts

  23. Vector Data in QGIS - Field Calculator

  24. Vector Data in QGIS - Field Calculator

  25. Vector Data in QGIS - Field Calculator

  26. Vector Data in QGIS - Field Calculator • Note that the area is calculated in the units defined by the CRS • In this case, we are using UTM 42N which uses meters • If the area was desired in km2 a new field could be added and the area in m2 could be divided by 106

  27. Plugins • Plus a whole bunch of Plugins! • Take some time to review the options under Plugins > Manage and Install Plugins

  28. Questions and Discussion

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