GIS - Level Advanced

24 Oct 2026

#gis

Level advanced melibatkan teknis yang lebih kompleks, automation, dan integrasi dengan sistem lain.

Spatial Databases

PostGIS (PostgreSQL)

SQL queries untuk analisis spasial
Indexing (GiST, SP-GiST)
View dan materialized view
Trigger dan functions
Multi-user access dan locking

SQL Spatial Operations

-- Contoh query PostGIS
SELECT name, ST_Area(geom) as area
FROM regions
WHERE ST_Within(geom, ST_MakeEnvelope(xmin, ymin, xmax, ymax, 4326));

-- Distance calculation
SELECT a.name, b.name, ST_Distance(a.geom, b.geom) as distance
FROM points a, points b
WHERE a.name != b.name AND ST_Distance(a.geom, b.geom) < 1000;

Programming & Automation

Python (PyQGIS, ArcPy)

Batch processing ribuan file
Custom algorithms dan tools
Automasi workflow harian
Integrasi dengan aplikasi lain

R (sf, terra packages)

Statistik spasial
Geostatistics
Machine learning pada data spasial
Data visualization

Web GIS

Server Setup

GeoServer (Open Source)
ArcGIS Server (Commercial)
MapServer (Open Source)

Web Services

WMS (Web Map Service) - Serve peta
WFS (Web Feature Service) - Serve data
WMTS (Web Map Tile Service) - Cache tiles
WPS (Web Processing Service) - Run analysis

Frontend Libraries

Leaflet (JS library, sederhana)
Mapbox GL JS (Vector tiles)
OpenLayers (Powerful, configurable)
MapLibre (Open source Mapbox fork)

Advanced Analysis

Geostatistics

Interpolation (IDW, Kriging)
Semivariogram analysis
Spatial autocorrelation (Moran’s I)
Hotspot analysis (Getis-Ord Gi*)

Network Analysis Advanced

Multi-modal routing
Origin-destination matrix
Service area dengan cost surface
Optimal location analysis

Remote Sensing Integration

Image processing
Classification (supervised/unsupervised)
NDVI dan indeks lainnya
Change detection