Quantum GIS, which is often called QGIS, is an open source GIS

desktop application. Comparing to ArcGIS, QGIS can be installed on

various operating systems, such as Windows, Mac OS X, Linux

(Ubuntu), and Unix. More importantly, QGIS is free and has many

plugins, adding different functions. However, since QGIS mainly

relies on community support and voluntary developers.

Different operations using QGIS.

• Dealing with Vector Layer Attributes

• Dealing with Vector Geometries

• Spatial Analysis

• Dealing with Raster

• Projections

• File conversions

• Map Creation

Introduction

Topology expresses the spatial relationships between connecting or

adjacent vector features (points, polylines and polygons) in a GIS.

Topological or topology-based data are useful for detecting and

correcting digitizing errors. Topology is necessary for carrying out

some types of spatial analysis, such as network analysis.

There are 20 rules for point, line and polygon in QGIS

In QGIS topology can apply simply on shapefile while in ArcGIS

topology can not apply without making database. QGIS topology

"must not have gaps" don’t consider ring polygons/ donuts polygons

as topological errors. QGIS shows errors along AJK, GB and

Occupied Kashmir. Value of cluster Tolerance in arc map is limited

to 0.0000009.Where as in QGIS it is much lower, we can say it is

zero because tolerance does not effect the topology errors in

QGIS. These gaps are very small and are visible at around 1300:1

sacle ratio. Due to high cluster tolerance arc map is not marking it

as errors.

Topology

Map Components

• The title of the map.

• The scale of the map.ss

• The North Arrow .

• The Legend .

• The reference.

ArcGIS has better annotation capabilities. There are more native cartographic output options with ArcGIS

Mapping

Network Analysis

Calculating the shortest distance between two points is a commonly

cited use for GIS.

Use Road Graph plugin to calculate shortest distance in QGIS.

There are some other network analysis modules in

ArcGIS other than shortest and fastest route generation,

which can not be done in QGIS.

1.New Surface Areasssss

2.Closet Facility

3.New OD Cost Matrix

4.New Vehicle Routing Problem

5.New Location-Allocation

Dark blue points show facilities and light blue point show incident

Network Analysis

Q GIS VS Arc GIS

• QGIS, is an open source GIS desktop application while ArcGIS is a

commercial GIS software.

• QGIS has less processing time than ArcGIS.

• QGIS is easy to use.

• QGIS is a freely downloadable open source GIS software while

Esri’s ArcGIS is a commercially available suite of software.

• QGIS can be loaded on any computer. ArcGIS is restricted

through a seat license.

•There are Plugins in QGIS while in ArcGIS tool boxes are used.

• QGIS is developed has a paid core of developers but also

depends in part on volunteers. ArcGIS is a commercial GIS

software package developed by paid staff members of Esri.

• QGIS is cross-platform and can be installed and run on

Windows, Mac, or Linux machines while Esri’s ArcGIS for Desktop

only runs in a Windows PC environment

• QGIS has a faster startup time than ArcGIS.

• In QGIS topology can apply simply on shapefile while in ArcGIS

topology can not apply without making database.

• ArcGIS has better annotation capabilities. There are more native

cartographic output options with ArcGIS

• ArcGIS has more out of the box spatial analytic

capabilities: hillshading, to overlays, map algebra, surface

approximation, network analysis.

References

• https://hub.qgis.org/wiki/17/How_do_I_do_that_in_QGIS

• http://www.qgis.org/en/site/forusers/download.html

•http://manual.linfiniti.com/en/create_vector_data/topo_editing

.html

• http://qgis.spatialthoughts.com/2012/06/making-maps-for-

print-using-qgis.html

• http://qgis.spatialthoughts.com/

• http://www.qgistutorials.com/en/docs/making_a_map.html

• https://sites.google.com/site/ochaimwiki/geodata-preparation-

manual/how-to-check-topology-using-arcgis

• http://docs.qgis.org/2.0/en/docs/user_manual/

Contact

Roll No SS10-03

Department of Space Science, Punjab University Lahore

Email address

Ayesha.anwar007@gmail.com

Conclusion

QGIS is an open source. It is easy to use. We can do a lot of

analysis by QGIS easily. It’s processing time is very short as

compare to ArcGIS. More plugins for QGIS are making by

developers all over the world.But prefer ArcGIS on QGIS because

ArcGIS is a professional software. It has more tools than QGIS. It

has more options for Spatial analysis , cartography and more

analysis.ss

Submitted by: Ayesha Rana Anwar

Submitted to: Sir Shahid Parvez

Quantum GISz

Mapping in ArcGISMapping in QGIS

Shortest Distance in ArcGISShortest Distance in QGIS

Topology errors In QGIS

Topology errors in ArcGIS

New closet Facility in ArcGIS