GEMMAGIS Extension for Map Management & Analysis

Standardized & harmonized GIS tools and processing pipeline for GMD activities

QGIS Plugin Repository URL

Copy the repository URL below to add it in QGIS Plugin Manager

https://gemma-plugin.vercel.app/gemma.xml

MBI Checker

Detect overlaps and gaps between barangay polygon boundaries with building point validation. Supports exporting styled MBI layers as GPKG.

Fill Polygon Gaps

Automatically fill gaps between polygons by assigning them to the correct neighboring barangay with a preview-before-apply workflow.

Export Preliminary Polygons

Merge and export resolved barangay boundary layers into a consolidated preliminary output for 1Map submission.

Update LGU PSGC Metadata

Auto-populate PSGC codes, region, province, and city/municipality fields using a reference table with fuzzy name matching.

Fix LGU CRS

Batch-correct or reposition vector layers digitized in local arbitrary grid coordinates (~0 to ~100,000) to standard WGS 84 (EPSG:4326) using 2D Affine OLS transformation.

Join Barangay Attributes

Perform enhanced attribute joins between LGU vector layers and PSGC reference tables using fuzzy matching and Roman numeral normalization.

Geometry Repair Toolkit

Validate and repair polygon geometries — detect duplicates, null geometries, invalid shapes, and wrong-type features with auto-fix capabilities.

Scan Geometry Errors

Scan vector polygon layers for specific geometry and topology defects and generate a Point Vector Sink with audit metadata.

Repair Polygon Geometries

Reconstruct invalid polygon geometries and recover missing shapes into a clean vector output layer with selection support.

Check and Update

Interactive 3-Phase dialog workflow for georeferencing, targeted geometry error scanning/repair, and metadata updating.

Package for QField

Package your QGIS project for field data collection using QField with drag-and-drop layer management.

Create Enumeration Areas

Delineate enumeration areas from barangay boundaries for census and survey field operations.

Clip Project Layers by Extent

Batch clip multiple vector layers to administrative boundary polygons with optional buffer margins.