Which of the following are open-source software used in geospatial data processing?

A. Arc GIS

B. Erdas Imagine

C. QGIS

D. ILWIS

E. SAGA GIS

Choose the most appropriate answer:

Correct option is C

Introduction:

QGIS: An open-source GIS software widely used for geospatial data analysis and visualization.
· Supports multiple file formats and integrates seamlessly with databases.
 ILWIS (Integrated Land and Water Information System):
· Open-source software that offers GIS and remote sensing capabilities.
· Ideal for image classification and spatial data visualization.
SAGA GIS (System for Automated Geoscientific Analyses):
· Free and open-source software designed for spatial analysis and geoscientific modeling.
· Known for its simplicity and wide range of geoprocessing tools.
ArcGIS:
· A proprietary GIS software developed by Esri.
· It is not open-source but is one of the most comprehensive GIS solutions.
 Erdas Imagine:
· Another proprietary software used for image processing and remote sensing.

Additional Knowledge: 

Open-source GIS Software Benefits:
· Cost-effectiveness: Free to use and modify.
· Community Support: Constant updates and plugins.
· Flexibility: Customizable based on user needs.
· Proprietary GIS Software Advantages:
· Professional Support: Dedicated customer service.
· Advanced Tools: Features like 3D visualization and large dataset handling.
· Comparison:
· QGIS vs. ArcGIS: QGIS is open-source, while ArcGIS offers advanced enterprise features.
· ILWIS vs. Erdas Imagine: ILWIS is suitable for basic remote sensing, while Erdas Imagine provides comprehensive image analysis.