This is ninth video tutorial of QGIS. It is about spatial statistics. The objective is to learn and use statistics tools in qgis and from SAGA modules from processing toolbox.
- Required Data layer: srtm_41_19.tif and road_34S.shp
- Convert Layers to 33S
- Vector > Geoprocessing Tools > Convex Hull
- Vector > Research Tools > Random points
- Save our output in exercise_data/spatial_statistics/ as random_points.shp
- Plugins > Analyses > Point sampling tool
- Save the output under exercise_data/spatial_statistics/ as random_samples.shp
- Vector > Analysis Tools > Basic statistics and use random_samples
- Create 03 points random data in distance_points layer and use Vector > Analysis Tools > Distance matrix.
- Vector > Analysis Tools > Nearest neighbor analysis and use random_samples.shp
- Vector > Analysis Tools > Mean coordinate(s) and use random_samples.shp and save resulting layer as mean_coords.shp
- Vector > Geometry Tools > Polygon centroids and save resulting layer as center_point.shp
- Using image histogram.
- Raster > Analysis > Grid (Interpolation) and saving output to exercise_data/spatial_statistics/interpolation.tif. Power to 5.0 and the Smoothing to 2.0
- Processing > Toolbox and use Spatial Point Pattern Analysis (use random_sample layer) and Minimum Distance Analysis (use random points layer)
The example files that are used in video can be downloaded from here .