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QGISUserGuide,Release2.2
UpdatingtheMapDisplayDuringRendering
Youcansetanoptiontoupdatethemapdisplayasfeaturesaredrawn. Bydefault,QGISdoesnotdisplayany
featuresforalayeruntiltheentirelayerhasbeenrendered. Toupdatethedisplayasfeaturesarereadfromthe
datastore,choosemenuoptionSettingsOptionsandclickontheRenderingtab. Setthefeaturecounttoan
appropriatevaluetoupdatethedisplayduringrendering.Settingavalueof0disablesupdateduringdrawing(this
isthedefault).Settingavaluetoolowwillresultinpoorperformance,asthemapcanvasiscontinuallyupdated
duringthereadingofthefeatures.Asuggestedvaluetostartwithis500.
InfluenceRenderingQuality
Toinfluencetherenderingqualityofthemap,youhavetwooptions. ChoosemenuoptionSettingsOptions,
clickontheRenderingtabandselectordeselectfollowingcheckboxes:
Makelinesappearlessjaggedattheexpenseofsomedrawingperformance
Fixproblemswithincorrectlyfilledpolygons
Speed-uprendering
Therearetwosettingsthatallowyoutoimproverenderingspeed. OpentheQGISoptionsdialogusingSettings
Options,gototheRenderingtabandselectordeselectthefollowingcheckboxes:
Enablebackbuffer. Thisprovidesbettergraphicsperformanceatthecostoflosingthepossibilityto
cancelrenderingandincrementallydrawfeatures.Ifitisunchecked,youcansettheNumberoffeaturesto
drawbeforeupdatingthedisplay,otherwisethisoptionisinactive.
Userendercachingwherepossibletospeedupredraws
8.4 Measuring
Measuringworks withinprojectedcoordinatesystems(e.g., UTM)andunprojecteddata. . Iftheloadedmap
isdefinedwithageographiccoordinatesystem(latitude/longitude),theresultsfromlineorareameasurements
willbeincorrect. Tofixthis,youneedtosetanappropriatemapcoordinatesystem(seesectionWorkingwith
Projections).Allmeasuringmodulesalsousethesnappingsettingsfromthedigitizingmodule. Thisisuseful,if
youwanttomeasurealonglinesorareasinvectorlayers.
Toselectameasuringtool,clickon
andselectthetoolyouwanttouse.
8.4.1 Measurelength,areasandangles
MeasureLine
:QGISisabletomeasurerealdistancesbetweengivenpointsaccordingtoadefinedellipsoid.To
configurethis,choosemenuoptionSettingsOptions, clickontheMaptoolstabandselecttheappropriate
ellipsoid. There,youcanalsodefinearubberbandcolorandyourpreferredmeasurementunits(metersorfeet)
andangleunits(degrees,radiansandgon). Thetoolthenallowsyoutoclickpointsonthemap. Eachsegment
length,aswellasthetotal,showsupinthemeasurewindow.Tostopmeasuring,clickyourrightmousebutton.
MeasureArea
: Areascanalsobemeasured. . Inthemeasurewindow, , theaccumulatedareasizeappears. . In
addition,themeasuringtoolwillsnaptothecurrentlyselectedlayer,providedthatlayerhasitssnappingtolerance
set(seesectionSettingtheSnappingToleranceandSearchRadius). So,ifyouwanttomeasureexactlyalonga
linefeature,oraroundapolygonfeature,firstsetitssnappingtolerance,thenselectthelayer. Now,whenusing
themeasuringtools,eachmouseclick(withinthetolerancesetting)willsnaptothatlayer.
8.4. Measuring
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QGISUserGuide,Release2.2
Figure8.2:MeasureDistance
(Gnome)
Figure8.3:MeasureArea
(Gnome)
MeasureAngle
:Youcanalsomeasureangles.Thecursorbecomescross-shaped.Clicktodrawthefirstsegment
oftheangleyouwishtomeasure,thenmovethecursortodrawthedesiredangle.Themeasureisdisplayedina
pop-updialog.
Figure8.4:MeasureAngle
(Gnome)
8.4.2 Selectanddeselectfeatures
TheQGIStoolbarprovidesseveraltoolstoselectfeaturesinthemapcanvas. Toselectoneorseveralfeatures,
justclickon
andselectyourtool:
SelectSingleFeature
SelectFeaturesbyRectangle
SelectFeaturesbyPolygon
SelectFeaturesbyFreehand
SelectFeaturesbyRadius
Todeselectallselectedfeaturesclickon
Deselectfeaturesfromalllayers.
8.5 Identifyfeatures
TheIdentifytoolallowsyoutointeractwiththemapcanvasandgetinformationonfeaturesinapop-upwindow.
Toidentifyfeatures,useViewIdentifyfeaturesorpressCtrl + Shift + I,orclickonthe
Identifyfeatures
36
Chapter8. GeneralTools
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pageIndex, The page index of the PDF page that will be 0
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If your page number is set as 1, then the two output PDF files will contains the first page and the later three pages Add necessary references:
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QGISUserGuide,Release2.2
iconinthetoolbar.
Ifyouclickonseveralfeatures,theIdentifyresultsdialogwilllistinformationaboutalltheselectedfeatures.The
firstitemisthenumberofthefeatureinthelistofresults,followedbythelayername.Then,itsfirstchildwillbe
thenameofafieldwithitsvalue.Finally,allinformationaboutthefeatureisdisplayed.
Thiswindowcanbecustomizedtodisplaycustomfields,butbydefaultitwilldisplaythreekindsofinformation:
• Actions:Actionscanbeaddedtotheidentifyfeaturewindows. . Whenclickingontheactionlabel,action
willberun.Bydefault,onlyoneactionisadded,toviewfeatureformforediting.
• Derived:Thisinformationiscalculatedorderivedfromotherinformation.Youcanfindclickedcoordinate,
XandYcoordinates,areainmapunitsandperimeterinmapunitsforpolygons,lengthinmapunitsfor
linesandfeatureids.
• Dataattributes:Thisisthelistofattributefieldsfromthedata.
Figure8.5:Identifyfeauresdialog
(Gnome)
Atthebottomofthewindow,youhavefiveicons:
Expandtree
Collapsetree
Defaultbehaviour
Copyattributes
PrintselectedHTMLresponse
Otherfunctionscanbefoundinthecontextmenuoftheidentifieditem.Forexample,fromthecontextmenuyou
can:
• Viewthefeatureform
• Zoomtofeature
• Copyfeature:Copyallfeaturegeometryandattributes
• Copyattributevalue:Copyonlythevalueoftheattributethatyouclickon
• Copyfeatureattributes:Copyonlyattributes
• Clearresult:Removeresultsinthewindow
• Clearhighlights:Removefeatureshighlightedonthemap
• Highlightall
8.5. Identifyfeatures
37
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QGISUserGuide,Release2.2
• Highlightlayer
• Activatelayer:Choosealayertobeactivated
• Layerproperties:Openlayerpropertieswindow
• Expandall
• Collapseall
8.6 Decorations
TheDecorationsofQGISincludetheGrid,theCopyrightLabel,theNorthArrowandtheScaleBar. Theyare
usedto‘decorate’themapbyaddingcartographicelements.
8.6.1 Grid
Gridallowsyoutoaddacoordinategridandcoordinateannotationstothemapcanvas.
Figure8.6:TheGridDialog
1. SelectfrommenuViewDecorationsGrid.Thedialogstarts(seefigure_decorations_1).
2. Activatethe
Enablegridcheckboxandsetgriddefinitionsaccordingtothelayersloadedinthemap
canvas.
3. Activatethe
Drawannotationscheckboxandsetannotationdefinitionsaccordingtothelayersloaded
inthemapcanvas.
4. Click[Apply]toverifythatitlooksasexpected.
5. Click[OK]toclosethedialog.
8.6.2 CopyrightLabel
Copyrightlabel
addsacopyrightlabelusingthetextyouprefertothemap.
1. SelectfrommenuViewDecorationsCopyrightLabel.Thedialogstarts(seefigure_decorations_2).
2. Enterthetextyouwanttoplaceonthemap.YoucanuseHTMLasshownintheexample.
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Chapter8. GeneralTools
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Add necessary references: RasterEdge.Imaging.Basic.dll. matchString, The string wil be deleted from PDF file, -. 0
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QGISUserGuide,Release2.2
Figure8.7:TheCopyrightDialog
3. ChoosetheplacementofthelabelfromthePlacement
combobox.
4. Makesurethe
EnableCopyrightLabelcheckboxischecked.
5. Click[OK].
Intheexampleabove,whichisthedefault,QGISplacesacopyrightsymbolfollowedbythedateinthelower
right-handcornerofthemapcanvas.
8.6.3 NorthArrow
NorthArrow
placesasimplenortharrowonthemapcanvas. Atpresent,thereisonlyonestyleavailable. You
canadjusttheangleofthearroworletQGISsetthedirectionautomatically.IfyouchoosetoletQGISdetermine
thedirection,itmakesitsbestguessastohowthearrowshouldbeoriented.Forplacementofthearrow,youhave
fouroptions,correspondingtothefourcornersofthemapcanvas.
Figure8.8:TheNorthArrowDialog
8.6.4 ScaleBar
ScaleBar
addsasimplescalebartothemapcanvas.Youcancontrolthestyleandplacement,aswellasthe
labelingofthebar.
QGISonlysupportsdisplayingthescaleinthesameunitsasyourmapframe.Soiftheunitsofyourlayersarein
meters,youcan’tcreateascalebarinfeet. Likewise,ifyouareusingdecimaldegrees,youcan’tcreateascale
bartodisplaydistanceinmeters.
Toaddascalebar:
8.6. Decorations
39
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QGISUserGuide,Release2.2
Figure8.9:TheScaleBarDialog
1. SelectfrommenuViewDecorationsScaleBar.Thedialogstarts(seefigure_decorations_4).
2. ChoosetheplacementfromthePlacement
combobox.
3. ChoosethestylefromtheScalebarstyle
combobox.
4. SelectthecolorforthebarColorofbar
orusethe
defaultblackcolor.
5. SetthesizeofthebaranditslabelSizeofbar
.
6. Makesurethe
Enablescalebarcheckboxischecked.
7. Optionally,check
Automaticallysnaptoroundnumberonresize.
8. Click[OK].
Tip: SettingsofDecorations
Whenyousavea.qgsproject,anychangesyouhavemadetoGrid,NorthArrow,ScaleBarandCopyrightwill
besavedintheprojectandrestoredthenexttimeyouloadtheproject.
8.7 AnnotationTools
The
TextAnnotation
toolintheattributetoolbarprovidesthepossibilitytoplaceformattedtextinaballoononthe
QGISmapcanvas.UsetheTextAnnotationtoolandclickintothemapcanvas.
Doubleclickingontheitemopensadialogwithvariousoptions.Thereisthetexteditortoentertheformattedtext
andotheritemsettings. Forinstance,thereisthechoiceofhavingtheitemplacedonamapposition(displayed
byamarkersymbol)ortohavetheitemonascreenposition(notrelatedtothemap).Theitemcanbemovedby
mapposition(bydraggingthemapmarker)orbymovingonlytheballoon.TheiconsarepartoftheGIStheme,
andtheyareusedbydefaultintheotherthemes,too.
The
MoveAnnotation toolallowsyoutomovetheannotationonthemapcanvas.
8.7.1 Htmlannotations
The
HtmlAnnotation
toolsintheattributetoolbarprovidesthepossibilitytoplacethecontentofanhtmlfileina
balloonontheQGISmapcanvas.UsingtheHtmlAnnotationtool,clickintothemapcanvasandaddthepathto
thehtmlfileintothedialog.
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Chapter8. GeneralTools
QGISUserGuide,Release2.2
Figure8.10:Annotationtextdialog
8.7.2 SVGannotations
The
SVGAnnotation
toolintheattributetoolbarprovidesthepossibilitytoplaceanSVGsymbolinaballoonon
theQGISmapcanvas.UsingtheSVGAnnotationtool,clickintothemapcanvasandaddthepathtotheSVGfile
intothedialog.
8.7.3 Formannotations
Additionally, youcanalsocreateyourownannotationforms. . The
FormAnnotation
toolisusefultodisplay
attributesofavectorlayerinacustomizedQtDesignerform(seefigure_custom_annotation). Thisissimilar
tothedesignerformsfortheIdentifyfeaturestool,butdisplayedinanannotationitem. Alsoseethisvideo
https://www.youtube.com/watch?v=0pDBuSbQ02ofromTimSuttonformoreinformation.
Note: IfyoupressCtrl+TwhileanAnnotationtoolisactive(moveannotation,textannotation,formannota-
tion),thevisibilitystatesoftheitemsareinverted.
8.8 SpatialBookmarks
SpatialBookmarksallowyouto“bookmark”ageographiclocationandreturntoitlater.
8.8.1 CreatingaBookmark
Tocreateabookmark:
1. Zoomorpantotheareaofinterest.
2. SelectthemenuoptionViewNewBookmarkorpressCtrl-B.
3. Enteradescriptivenameforthebookmark(upto255characters).
4. PressEntertoaddthebookmarkor[Delete]toremovethebookmark.
Notethatyoucanhavemultiplebookmarkswiththesamename.
8.8. SpatialBookmarks
41
QGISUserGuide,Release2.2
Figure8.11:Customizedqtdesignerannotationform
8.8.2 WorkingwithBookmarks
Touseormanagebookmarks, selectthemenuoptionViewShowBookmarks. TheGeospatialBookmarks
dialogallowsyoutozoomtoordeleteabookmark.Youcannoteditthebookmarknameorcoordinates.
8.8.3 ZoomingtoaBookmark
FromtheGeospatialBookmarksdialog,selectthedesiredbookmarkbyclickingonit,thenclick[ZoomTo].You
canalsozoomtoabookmarkbydouble-clickingonit.
8.8.4 DeletingaBookmark
TodeleteabookmarkfromtheGeospatialBookmarksdialog,clickonit,thenclick[Delete].Confirmyourchoice
byclicking[Yes],orcancelthedeletebyclicking[No].
8.9 NestingProjects
Ifyouwanttoembedcontentfromotherprojectfilesintoyourproject,youcanchooseLayerEmbedLayers
andGroups.
8.9.1 Embeddinglayers
Thefollowingdialogallowsyoutoembedlayersfromotherprojects.Hereisasmallexample:
1. Press
tolookforanotherprojectfromtheAlaskadataset.
2. Selecttheprojectfilegrassland.Youcanseethecontentoftheproject(seefigure_embed_dialog).
3. PressCtrlandclickonthelayersgrassland d andregions. . Press[OK].Theselectedlayersare
embeddedinthemaplegendandthemapviewnow.
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Chapter8. GeneralTools
QGISUserGuide,Release2.2
Figure8.12:Selectlayersandgroupstoembed
Whiletheembeddedlayersareeditable,youcan’tchangetheirpropertieslikestyleandlabeling.
8.9.2 Removingembeddedlayers
Right-clickontheembeddedlayerandchoose
Remove
.
.
8.9. NestingProjects
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QGISUserGuide,Release2.2
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Chapter8. GeneralTools
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