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

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4.5 Editing Tip 9 DATA INTEGRITY Please consider backing up your data source before you start editing, and also at regular intervals during editing. QGIS is still at a pre-version 1.0 stage, and so may not be able to protect your data in all situations. All editing sessions start by choosing the Allow editing option. This can be found in the context menu after right clicking on the legend entry for that layer. Alternately, you can use the Start editing or Stop editing buttons from the toolbar to toggle the editing mode. Tip 10 EDITING A MAP IS DIFFERENT TO EDITING AN ATTRIBUTE TABLE In this version of QGIS, the Start editing/Stop editing couplet on the map view acts separately to the Start Editing/Stop Editing couplet on the attribute table. Tip 11 SAVE REGULARLY Remember to toggle Allow editing off or select the Stop editing button regularly. This allows you to save your changes thus far, and also confirms that your data source can accept all your changes. Once the layer is in edit mode, markers will appear at the vertices. You can perform the following editing functions: • Add Features • Add Vertices of a Feature • Move Vertices of a Feature • Delete Vertices of a Feature • Cut Selected Features • Copy Selected Features • Paste Selected Features • Delete Selected Features Adding Features Before you start adding features, use the pan and zoom tools to first navigate to the area of interest. Then you can use the Capture Point, Capture Line or Capture Polygon icon on the toolbar to put the QGIS cursor into digitizing mode. For each feature, you first digitize the geometry, then enter its attributes. QGIS 0.8 User Guide 29
4.5 Editing Tip 12 CONCURRENT EDITS This version of QGIS does not track if somebody else is editing a feature at the same time as you. The last writer wins. Tip 13 ZOOM IN BEFORE EDITING Before editing a layer, you should zoom in to your area of interest first. This avoids waiting while all the vertex markers are rendered across the entire layer. To digitize the geometry, left-click on the map area to create the first point of your new feature. For lines and polygons, keep on left-clicking for each additional point you wish to capture. When you have finished adding points, right-click anywhere on the map area to confirm you have finished entering the geometry of that feature. The attribute window will appear, allowing you to enter the information for the new feature. Figure 6 shows setting attributes for a fictitious new river in England. Figure 6: Vector Digitizing Attributes Capture Dialog QGIS 0.8 User Guide 30
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 and 34: 4.2 PostGIS Layers SPIT Plugin QGIS
Page 35 and 36: 4.3 The Vector Properties Dialog Gr
Page 37: 4.5 Editing 4.4.2. Using Actions Ac
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
Page 85 and 86: 10.3 Using the Delimited Text Plugi
Page 87 and 88: 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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