Calculating raster area
Following a tutorial, I used a raster layer with land cover classes and calculated the area of each class within a national park.
Tutorial: Calculating Raster Area (QGIS3) — QGIS Tutorials and Tips
Sampling raster data
Using a raster grid of daily maximum temperature and also a US counties shapefile, I calculated the average value within each polygon using the zonal statistics tool. The result is a thematic map which shows US counties by maximum daily temperature.
Tutorial: Sampling Raster Data using Points or Polygons (QGIS3) — QGIS Tutorials and Tips
Nearest neighbor analysis
Following a tutorial, I performed a nearest neighbor analysis in QGIS using the ‘Distance to nearest hub’ tool. Using the tool, I created a line from each red point (historical earthquake) to its nearest yellow point (populated place).
Tutorial: Nearest Neighbor Analysis (QGIS3) — QGIS Tutorials and Tips
Performing spatial queries
Following a tutorial, and using data from the city of Melbourne’s Open Data Platform, I performed a spatial query using the ‘extract by location’ tool to extract bars and pubs within 500 meters of a metro station.
Tutorial: Performing Spatial Queries (QGIS3) — QGIS Tutorials and Tips
Performing Spatial Joins
For this project I first followed a tutorial, then added to it by visualizing the result in a different way. The tutorial involved using the spatial join with summary algorithm to join the average street rating to each borough. I decided to use graduated symbology by the value of the pavement rating for both the boroughs and the individual streets to make a more effective thematic map.
Tutorial: Performing Spatial Joins (QGIS3) — QGIS Tutorials and Tips
Searching and Downloading OpenStreetMap Data
Following a tutorial, I extracted locations of all bars and pubs in London from the OpenStreetMap database and saved it as a vector layer.
Tutorial: Searching and Downloading OpenStreetMap Data (QGIS3) — QGIS Tutorials and Tips
Digitizing Map Data
Following a tutorial, I used a raster topographic map and created several vector layers representing features around a park.
tutorial: Digitizing Map Data (QGIS3) — QGIS Tutorials and Tips
Working With Terrain Data
Following a tutorial, I created contours and a hillshade map of the area around Mt. Everest.
Tutorial: Working with Terrain Data (QGIS3) — QGIS Tutorials and Tips
Georeferencing Scanned Maps
Following a tutorial, I used a scanned map of southern India from 1870 and geo-referenced it using QGIS. The scanned map was obtained from Hipkiss’ Scanned Old Maps.
Tutorial: Georeferencing Topo Sheets and Scanned Maps (QGIS3) — QGIS Tutorials and Tips
Basic GIS Operations 1
The following are screenshots from four tutorials I followed. Link and description are in each caption.
