Granulometria por Fotointerpretacion
Measures rock grain sizes in a photo by photointerpretation and exports gradation reports.
Granulometria por Fotointerpretacion (Photointerpretation Grain Size Analysis) measures the size of rock grains in a georeferenced photo, typically captured by drone. The user draws the photo outline to obtain the total area, then draws or adjusts grain polygons (for example, produced by a segmentation tool such as GeoAI/Segment Anything). The plugin filters grains by a sieve-size threshold, computes coarse/fine material areas and percentages, and exports: (1) an Excel workbook with area/diameter data in a fixed template layout, (2) a second Excel workbook with image and material summary information, and (3) a GeoPackage bundling the polygon layer, the source photo raster, and an embedded QGIS project, exported as-is in the project's coordinate system (no reprojection). No external Python packages are required: the plugin only uses Qt (via qgis.PyQt) and qgis.core/qgis.gui, all of which ship with QGIS. The Excel files are written natively with the zipfile/XML standard library (no openpyxl dependency). The plugin's image analysis methodology follows the principles of ISO 13322-1:2014 (Particle size analysis — Image analysis methods — Part 1: Static image analysis methods), applying static image analysis with complete pixel-count evaluation to determine particle size distributions from georeferenced photographs.