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

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4.3 The Vector Properties Dialog CREATE INDEX [indexname] ON [tablename] USING GIST ( [geometryfield] GIST_GEOMETRY_OPS ); Note that for large tables, creating the index can take a long time. Once the index is created, you should perform a VACUUM ANALYZE. See the PostGIS documentation (4) for more information. The following is an example of creating a GiST index: gsherman@madison:~/current$ psql gis_data Welcome to psql 8.0.0, the PostgreSQL interactive terminal. Type: \copyright for distribution terms \h for help with SQL commands \? for help with psql commands \g or terminate with semicolon to execute query \q to quit gis_data=# CREATE INDEX sidx_alaska_lakes ON alaska_lakes gis_data-# USING GIST (the_geom GIST_GEOMETRY_OPS); CREATE INDEX gis_data=# VACUUM ANALYZE alaska_lakes; VACUUM gis_data=# \q gsherman@madison:~/current$ 4.3. The Vector Properties Dialog The vector properties dialog provides information about a layer, symbology settings, and labeling options. If your vector layer has been loaded from a PostgreSQL / PostGIS datastore, you can also alter the underlying SQL for the layer - either by hand editing the SQL on the General tab, or by invoking the query builder dialog on the General tab. To access the properties dialog, double-click on a layer in the legend or right-click on the layer and select Properties from the popup menu. 4.3.1. Vector Symbology QGIS supports a number of symbology renderers to control how vector features are displayed. Currently the following renderers are available: Single symbol - a single style is applied to every object in the layer. QGIS 0.8 User Guide 25
4.3 The Vector Properties Dialog Graduated symbol - objects within the layer are displayed with different symbols classified by the values of a particular field. Continuous colour - objects within the layer are displayed with a spread of colours classified by the numerical values within a specified field. Unique value - objects are classified by the unique values within a specified field with each value having a different symbol. To change the symbology for a layer, simply double click on its legend entry and the vector layer properties dialog will be shown. Figure 5: Vector Layer Properties Dialog 4.3.2. Vector transparency QGIS 0.8 allows to set a transparency for every vector layer. This can be done with the slider right below the legend type (see fig. 5). This is very useful for displaying several vector-layers. QGIS 0.8 User Guide 26
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 and 14: 2.1 Why is all this so new? 2.1. Wh
Page 15 and 16: 3. Getting Started This chapter giv
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: 4.2 PostGIS Layers SPIT Plugin QGIS
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
Page 63 and 64: 8.4 Digitizing and Editing Tools sh
Page 65 and 66: 8.4 Digitizing and Editing Tools Ic
Page 67 and 68: 8.6 GRASS Toolbox When clicking on
Page 69 and 70: 8.7 Creating new vectors Figure 15:
Page 71 and 72: 9. Map Composer The map composer is
Page 73 and 74: 9.1 Using Map Composer 9.1.2. Addin
Page 75 and 76: 10. Using Plugins 10.1. An Introduc
Page 77 and 78: 10.1 An Introduction to Using Plugi
Page 79 and 80: 10.2 Using the GPS Plugin 10.2. Usi
Page 81 and 82: 10.2 Using the GPS Plugin Figure 21
Page 83 and 84: 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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