How to Extract Landslide Slope and Grid Unit Using QGIS only

Learn how to build, edit, and run a QGIS graphical modeler workflow to calculate polygon areas, set up inputs, and generate landslide statistics for a new output layer.

Configure QGIS 3.14 for landslide data import and projection setup, organize data and results, and load LaGriSU tool packs to run grid and slope unit analyses.

Learn to extract slope values for original landslide inventories in QGIS, linking points to grid units and producing a slope roster, box plot, and statistics to assess thresholds.

Extract landslide-free inventory and zones in QGIS using two methods: slope-threshold with a 250 m buffer and polygon buffering, producing landslide-free polygons, zones, and points from the inventory.

Learn to generate training and testing subsets from landslide inventory in QGIS, comparing slope with buffer versus buffer-only approaches for model validation.

Learn to extract slope units and landslide points in QGIS, using dam and channel network intersections, shape index thresholds, and minimum area settings to generate study area slope units.

Apply qgis workflows to extract landslide-free zones and build a landslide inventory by using stop units, grid units, buffers, and threshold-based statistics.

Extract training and testing subsets by randomly sampling 70% and 30% from landslide and dissolved layers, ensuring no overlap and applying geometry fixes for accurate evaluation.

Extract slope values for the original landslide inventory using polygon-based polygons in QGIS, then summarize with statistics and a box plot and set a threshold via mean minus standard deviation.

Identify landslide regions and build a landslide-free inventory for the three regions using a 250-meter buffer from polygon borders, compare option one and two, and derive the mean area.

Identify and select conditioning factors for landslide analysis, including dam, slope, curvature, geology, land cover, and aspect, and apply training and testing to extract landslide grid units in QGIS.

Complete slope unit extraction using a polygon feature, ensuring projection consistency and appropriate shape index; then merge intersecting slope units into a single landslide feature for the study area.

Extract slope values for the landslide inventory in QGIS, using the shape index and area thresholds to define slope units, dissolve neighbors into features, and prepare balanced sample sets.

Learn how to create single-feature landslide groups by joining slope-unit attributes to a landslide inventory in QGIS, and to split data into training and testing subsets with no common features.

Define conditioning factors for landslide analysis in QGIS by selecting variables such as slope, curvature, geology, and land cover, and choose slope unit or grid unit based on data availability.

Use LaGriSU tools in QGIS to extract landslide slope and grid units, apply a buffer-based safe-area around landslides, and prepare training and testing samples with up to 15 conditioning variables.