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 and reference disputed case exclusion.

MBI Validator

Cross-check Reference MBI layers against Checker GAP/OVERLAP layers to flag status mismatches and audit boundary resolutions.

Run Analysis

Perform boundary discrepancy detection across polygon layers and building points, consolidating findings into reference MBI case layers.

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 Metadata

Standardize LGU polygon layers with PSGC geocodes, cascading administrative filters, and permanent GeoPackage export.

Update Metadata (by Geocode)

Perform a direct PSGC left-join on LGU boundary layers using geocodes, auto-populating standard 15-attribute schemas and exporting GeoPackages.

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.

PSA - LGU Boundary Comparison

Audit PSA reference boundaries against LGU-submitted polygons using geocodes, global alignment models, and building point validation.

Know Your Projection!

Diagnose unknown coordinate systems, auto-detect Philippine CRS candidates, and georeference local CAD grids via 2D affine transformations.

Package for QField

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

EA Delineation and Merging

Integrated module for pre-processing, gap filling, delineation (splitting), and merging of enumeration area boundaries.

Clip Project Layers by Extent

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

Package Style Loader

Interactive dialog to organize layer hierarchies, assign functional roles, and apply QML symbology and labeling.

Package Layers by City/Mun

Split reference boundary layers and building points into clean, self-contained GeoPackage deliverables per city or municipality.