TRD 05: Data Presentation techniques (Mapping) Quantum GIS ...

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2.1 Why is all this so new? 2.1.2. Vector Data Vector data is also used in geospatial applications. If you stayed awake during trigonometry and coordinate geometry classes, you will already be familiar with some of the qualities of vector data. In its simplest sense, vectors are a way of describing a location by using a set of coordinates. Each coordinate refers to a geographic location using a system of x and y values. This can be thought of in reference to a Cartesian plane - you know, the diagrams from school that showed an x and y-axis. You might have used them to chart declining retirement savings or increasing compound mortgage interest, but the concepts are essential to geospatial data analysis and mapping. There are various ways of representing these geographic coordinates depending on your purpose. This is a whole area of study for another day - map projections. Vector data takes on three forms, each progressively more complex and building on the former. 1. Points - A single coordinate (x y) represents the discrete geographic location 2. Lines - Multiple coordinates (x1 y1, x2 y2, x3 y4, ... xn yn) strung together in a certain order. Like drawing a line from Point (x1 y1) to Point (x2 y2) and so on. These parts between each point are considered line segments. They have a length and the line can be said to have a direction based on the order of the points. Technically, a line is a single pair of coordinates connected together; whereas, a line string is multiple lines connected together. 3. Polygons - When lines are strung together by more than two points, with the last point being at the same location as the first, we call this a polygon. A triangle, circle, rectangle, etc. are all polygons. The key feature of polygons is that there is a fixed area within them. QGIS 0.8 User Guide 5
3. Getting Started This chapter gives you a quick overview of running QGIS and examining data available on the QGIS web page. 3.1. Installation Installation of QGIS is documented in Appendix 3.1. The Installation Guide is distributed with the QGIS source code and is also available at http://qgis.org. Under Windows and Mac OS X, QGIS is available as a standard installer package. Packages for many flavors of Linux are also available. Check the QGIS website at http://qgis.org for the latest information on binary packages. 3.2. Sample Data If you do not have any GIS data handy, you can obtain an Alaska dataset from the QGIS web site at http://qgis.org. For use with GRASS, a sample GRASS database (Spearfish) can be obtained from the official GRASS GIS-website http://grass.itc.it/download/data.php. These data sets will be used as the basis for many of the examples and screenshots provided in this document. 3.3. Starting QGIS Assuming that QGIS is installed in the PATH, you can start QGIS by typing: qgis at a command prompt or by double clicking on the QGIS application link (or shortcut) on the desktop. Under MS Windows, start QGIS using the Start menu shortcut, and under Mac OS X, double click the icon in your Applications folder. 3.3.1. Command Line Options QGIS supports a number of options when started from the command line. To get a list of the options, enter qgis -help on the command line. The usage statement for QGIS is: holl@bim:~ > qgis --help Quantum GIS - 0.8.0 ’TITAN’ Quantum GIS (QGIS) is a viewer for spatial data sets, including raster and vector data. Usage: qgis [options] [FILES] QGIS 0.8 User Guide 6
Page 1 and 2: THE REGIONAL TRAINING WORKSHOP ON L
Page 3 and 4: Contents Contents Title Table of Co
Page 5 and 6: Contents 6. Working with OGC Data 4
Page 7 and 8: Contents E. Dependencies 95 E.1. Pr
Page 9 and 10: List of Tables List of Tables 1. Po
Page 11 and 12: 1.2 Whats New in 0.8 9. Label featu
Page 13: 2.1 Why is all this so new? 2.1. Wh
Page 17 and 18: 3.4 QGIS GUI 3.4. QGIS GUI When QGI
Page 19 and 20: 3.4 QGIS GUI - Add a PostGIS Layer
Page 21 and 22: 3.5 Rendering overview have been se
Page 23 and 24: 3.6 Measuring features are read fro
Page 25 and 26: 3.9 Spatial Bookmarks $HOME/.config
Page 27 and 28: 4. Working with Vector Data QGIS su
Page 29 and 30: 4.1 ESRI Shapefiles Figure 4: QGIS
Page 31 and 32: 4.2 PostGIS Layers Name Host Databa
Page 33 and 34: 4.2 PostGIS Layers SPIT Plugin QGIS
Page 35 and 36: 4.3 The Vector Properties Dialog Gr
Page 37 and 38: 4.5 Editing 4.4.2. Using Actions Ac
Page 39 and 40: 4.5 Editing Tip 12 CONCURRENT EDITS
Page 41 and 42: 4.5 Editing Deleting Vertices of a
Page 43 and 44: 4.6 Query Builder To complete the c
Page 45 and 46: 5. Working with Raster Data QGIS su
Page 47 and 48: 5.4 Raster Properties • Collapse
Page 49 and 50: 5.4 Raster Properties 5.4.2. Genera
Page 51 and 52: 6. Working with OGC Data 6.1. What
Page 53 and 54: 6.2 WMS Client December 2006, but c
Page 55 and 56: 6.2 WMS Client Each WMS Layer can b
Page 57 and 58: 6.2 WMS Client Editing WMS Layer Se
Page 59 and 60: 7.2 Getting Started The Projection
Page 61 and 62: 7.3 Custom Projections At version 0
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8.4 Digitizing and Editing Tools Ic
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8.6 GRASS Toolbox When clicking on
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8.7 Creating new vectors Figure 15:
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9. Map Composer The map composer is
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9.1 Using Map Composer 9.1.2. Addin
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10. Using Plugins 10.1. An Introduc
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10.1 An Introduction to Using Plugi
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10.2 Using the GPS Plugin 10.2. Usi
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10.2 Using the GPS Plugin Figure 21
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10.2 Using the GPS Plugin %out is r
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10.3 Using the Delimited Text Plugi
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10.3 Using the Delimited Text Plugi
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11. Help and Support 11.1. Mailingl
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11.5 Wiki 11.5. Wiki Lastly, we mai
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A.2 GDAL Raster Formats A.2. GDAL R
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B. GNU Public License GNU GENERAL P
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the scope of this License. 3. You m
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12. IN NO EVENT UNLESS REQUIRED BY
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C. Installation The described proce
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D.1 Binary packages In addition, pa
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E.2 GEOS E.2. GEOS Note: As of vers
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E.4 PostGIS psql test select versio
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E.7 GRASS 5. Build and install GDAL
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#define QT_VERSION_STR "4.1.0" In t
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F.2 Configuring QGIS the right way
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Literature Web-References [1] GEOS.
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Index measure, 14 measure:areas, 14
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Index limits, 47 coordinate referen
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