Introduction To GIS using QGIS

This presentation is prepared for GIS elective . It is group presentation.
Introduces GIS concepts with Open Source QGIS software.
Source code is availalbe @ http://is.gd/gistex

Transcript

1. GIS using QGIS Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi Vishwakarma Institute Of Technology Department Of Computer Engineering Pune March 12 , 2012
2. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End 1 Introduction Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 2 / 16
3. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End 1 Introduction 2 Get QGIS How To Get QGIS working on your Computer? Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 2 / 16
4. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End 1 Introduction 2 Get QGIS How To Get QGIS working on your Computer? 3 Geographic Data Data Representation Spatially Referenced Data Attribute Table Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 2 / 16
5. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End 1 Introduction 2 Get QGIS How To Get QGIS working on your Computer? 3 Geographic Data Data Representation Spatially Referenced Data Attribute Table 4 GIS File Formats Shapefiles OpenStreetMap Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 2 / 16
6. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End 1 Introduction 2 Get QGIS How To Get QGIS working on your Computer? 3 Geographic Data Data Representation Spatially Referenced Data Attribute Table 4 GIS File Formats Shapefiles OpenStreetMap 5 Let’s Get Some Action Enough Theory ! Lets Do Maps Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 2 / 16
7. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End 1 Introduction 2 Get QGIS How To Get QGIS working on your Computer? 3 Geographic Data Data Representation Spatially Referenced Data Attribute Table 4 GIS File Formats Shapefiles OpenStreetMap 5 Let’s Get Some Action Enough Theory ! Lets Do Maps 6 Real World Examples QGIS application for Bushfire Hazard Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 2 / 16
8. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End 1 Introduction 2 Get QGIS How To Get QGIS working on your Computer? 3 Geographic Data Data Representation Spatially Referenced Data Attribute Table 4 GIS File Formats Shapefiles OpenStreetMap 5 Let’s Get Some Action Enough Theory ! Lets Do Maps 6 Real World Examples QGIS application for Bushfire Hazard 7 End Bibiliography Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 2 / 16
9. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Introduction What is GIS ? Capture,Store,Manipulate,Analyze,Manage,Present all types of geographically referenced data. Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 3 / 16
10. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End How To Get QGIS working on your Computer? How To Get QGIS www.qgis.org/ Available for GNU/Linux , Mac , Windows No special hardware requirements Open Source Community Support www.qgis.org/en/community.html Python plugins pyqgis.org/repo/official Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 4 / 16
11. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Data Representation Spatially Referenced Data Attribute Table GIS Data Types GIS data represents real objects Discrete objects (e.g., a house) and Continuous fields (such as rainfall amount, or elevations) Two types of data −→ 1 Spatially Referenced Data Vector data Raster Images 2 Attribute Table QGIS supports both the types Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 5 / 16
12. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Data Representation Spatially Referenced Data Attribute Table Vector Data Split into three layers −→ 1 Points Used to represent non adjacent and discrete data points Points have zero dimensions, no measurement with points Line features have a starting and ending point 2 Lines Used to represent linear features such as rivers, streets Line features are one dimensional Line features have a starting and ending point 3 Polygons Used to represent ares such as boundary of city,lakes or forest Polygon features are two dimensional Used in Thematic maps Points and Lines represent polygon data at small scale Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 6 / 16
13. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Data Representation Spatially Referenced Data Attribute Table Raster Data Also known as grid data Represents surfaces Raster data is cell-based and this data category also includes aerial and satellite imagery Types of Raster data −→ 1 Discrete Eg. Population Density 2 Continuous Eg. Temprature and Elevation measurements Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 7 / 16
14. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Data Representation Spatially Referenced Data Attribute Table Attribute Table A database or tabular file Row represents a feature and each column represents one feature attribute. In raster datasets, each row of an attribute table corresponds to a certain zone of cells having the same value Attribute tables are often joined or related to spatial data layers, and the attribute values they contain can be used to find, query, and symbolize features or raster cells Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 8 / 16
15. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Shapefiles OpenStreetMap Shapefiles Geospatial vector data format Shapefiles spatially describe geometries: points, polylines, and polygons. The shapefile format was introduced with ArcView GIS version 2 in the beginning of the 1990s Mandetory Files with a Shapefile 1 .shp shape format; the feature geometry itself 2 .shx shape index format; a positional index of the feature geometry to allow seeking forwards and backwards quickly 3 .dbf attribute format; columnar attributes for each shape, in dBase IV format Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 9 / 16
16. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Shapefiles OpenStreetMap Shapefiles Continued.. Limitations −→ 1 Shapefiles do not have the ability to store topological information 2 The maximum size of either .shp or .dbf component files cannot exceed 2 GB (or 231 bits). This translates to, at best, about 70 million point features. Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 10 / 16
17. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Shapefiles OpenStreetMap OpenStreetMap OpenStreetMap (OSM) is a collaborative project to create a free editable map of the world www.openstreetmap.org Motivational Factors Restrictions on use or availability of map information across much of the world Advent of inexpensive portable Satellite navigation devices The OpenStreetMap approach to mapping was inspired by sites such as Wikipedia QGIS has OSM plugin which can be used to manipulate OSM data Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 11 / 16
18. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Enough Theory ! Lets Do Maps Enough Theory! At this point we have enough GIS ’theory’ to know So let’s start a project We will use sample data from www.openstreetmap.org and www.naturalearthdata.com Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 12 / 16
19. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End QGIS application for Bushfire Hazard Local Government Bushfire Hazard Mapping The Queensland region in Australia, mainly the southern part, suffers from major bushfires. Bushfire is a real and present concern for the residents and landowners in the Southern Downs Region, and has resulted in the loss of life and property. The project allows the council and the people of the region to be more aware of the risk and to allow for better decision making in the future. Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 13 / 16
20. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End QGIS application for Bushfire Hazard Local Government Bushfire Hazard Mapping Continued.. This kind of job would normally be done using consultants but was instead done by the council itself using a combination of QGIS and GRASS. QGIS was selected as the interaction between QGIS and GRASS made it easy to process the raster maps and present them in a meaningful way to users http://www.qgis.org/fr/communaute/etude-de-cas/ queensland-australia.html Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 14 / 16
21. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Bibiliography References I QGIS Home Page http://www.qgis.org/ QGIS user manual http://download.osgeo.org/qgis/doc/manual/qgis-1.7.0_ user_guide_en.pdf Latex Beamer Reference http://www.math.umbc.edu/~rouben/beamer/ Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 15 / 16
22. Introduction Get QGIS Geographic Data GIS File Formats Let’s Get Some Action Real World Examples End Bibiliography Thank You This presentation is created in latex-beamer and is available @ http://is.gd/gistalk Questions? Vishal Sonawane Prathamesh Sonpatki Ajinkya Suryawanshi GIS + QGIS 16 / 16