c# display pdf in window : Add pages to pdf preview control application system azure web page asp.net console QGIS-2.2-UserGuide-en28-part486

QGISUserGuide,Release2.2
• RowsandColumns:Usedtochangethedimensionsoftheoutputraster. . Thesevaluesarealsolinkedto
theCellsizeXandCellsizeYvalues.Increasingthenumberofrowsorcolumnswilldecreasethecellsize
andincreasethefilesizeoftheoutputfile. ThevaluesinRowsandColumnsarealsolinked,sodoubling
thenumberofrowswillautomaticallydoublethenumberofcolumnsandthecellsizeswillalsobehalved.
Thegeographicalareaoftheoutputrasterwillremainthesame!
• CellsizeXandCellsizeY:Controlthegeographicsizeofeachpixelintheoutputraster.Changingthese
valueswillalsochangethenumberofRowsandColumnsintheoutputraster.
• Kernelshape:Thekernelshapecontrolstherateatwhichtheinfluenceofapointdecreasesasthedistance
fromthepointincreases. Differentkernels s decayatdifferentrates, soatriweightkernelgivesfeatures
greaterweightfordistancesclosertothepointthentheEpanechnikovkerneldoes.Consequently,triweight
resultsin“sharper”hotspots, andEpanechnikovresultsin“smoother”hotspots. . Anumberofstandard
kernelfunctionsareavailableinQGIS,whicharedescribedandillustratedonWikipedia.
• Decayratio:CanbeusedwithTriangularkernelstofurthercontrolhowheatfromafeaturedecreaseswith
distancefromthefeature.
– Avalueof0(=minimum)indicatesthattheheatwillbeconcentratedinthecentreofthegivenradius
andcompletelyextinguishedattheedge.
– Avalueof0.5indicatesthatpixelsattheedgeoftheradiuswillbegivenhalftheheataspixelsatthe
centreofthesearchradius.
– Avalueof1meanstheheatisspreadevenlyoverthewholesearchradiuscircle. . (Thisisequivalent
tothe‘Uniform’kernel.)
– Avaluegreaterthan1indicatesthattheheatishighertowardstheedgeofthesearchradiusthanatthe
centre.
Theinputpointlayermayalsohaveattributefieldswhichcanaffecthowtheyinfluencetheheatmap:
• Useradiusfromfield:Setsthesearchradiusforeachfeaturefromanattributefieldintheinputlayer.
• Useweightfromfield: Allowsinputfeaturestobeweightedbyanattributefield. . Thiscanbeusedto
increasetheinfluencecertainfeatureshaveontheresultantheatmap.
Whenanoutputrasterfilenameisspecified,the[OK]buttoncanbeusedtocreatetheheatmap.
19.14.3 Tutorial:CreatingaHeatmap
Forthefollowingexample,wewillusetheairportsvectorpointlayerfromtheQGISsampledataset(seeSam-
pleData).AnotherexellentQGIStutorialonmakingheatmapscanbefoundathttp://qgis.spatialthoughts.com.
InFigure_Heatmap_1,theairportsofAlaskaareshown.
1. Selectthe
HeatmaptoolbuttontoopentheHeatmapdialog(seeFigure_Heatmap_2).
2. IntheInputpointlayer
field,selectairportsfromthelistofpointlayersloadedinthecurrent
project.
3. Specifyanoutputfilenamebyclickingthe
buttonnexttotheOutputrasterfield. Enterthefilename
heatmap_airports(nofileextensionisnecessary).
4. LeavetheOutputformatasthedefaultformat,GeoTIFF.
5. ChangetheRadiusto1000000meters.
6. Clickon[OK]tocreateandloadtheairportsheatmap(seeFigure_Heatmap_3).
QGISwillgeneratetheheatmapandaddtheresultstoyourmapwindow. Bydefault,theheatmapisshadedin
greyscale,withlighterareasshowinghigherconcentrationsofairports.TheheatmapcannowbestyledinQGIS
toimproveitsappearance.
1. Openthepropertiesdialogoftheheatmap_airportslayer(selectthelayerheatmap_airports,
openthecontextmenuwiththerightmousebuttonandselectProperties).
19.14. HeatmapPlugin
275
Add pages to pdf preview - insert pages into PDF file in C#.net, ASP.NET, MVC, Ajax, WinForms, WPF
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QGISUserGuide,Release2.2
Figure19.24:AirportsofAlaska
Figure19.25:TheHeatmapDialog
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C# WinForms Viewer: Load, View, Convert, Annotate and Edit PDF
Add text to PDF document in preview. • Add text box to PDF file in preview. Erase PDF pages. Miscellaneous. Search PDF text in preview.
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QGISUserGuide,Release2.2
Figure19.26:Theheatmapafterloadinglookslikeagreysurface
2. SelecttheStyletab.
3. ChangetheRendertype
to‘Singlebandpseudocolor’.
4. SelectasuitableColormap
,forinstanceYlOrRed.
5. Clickthe[Load]buttontofetchtheminimumandmaximumvaluesfromtheraster,thenclickthe[Classify]
button.
6. Press[OK]toupdatethelayer.
ThefinalresultisshowninFigure_Heatmap_4.
.
19.15 RoadGraphPlugin
TheRoadGraphPluginisaC++pluginforQGISthatcalculatestheshortestpathbetweentwopointsonany
polylinelayerandplotsthispathovertheroadnetwork.
Mainfeatures:
• Calculatespath,aswellaslengthandtraveltime.
• Optimizesbylengthorbytraveltime.
• Exportspathtoavectorlayer.
• Highlightsroadsdirections(thisisslowandusedmainlyfordebugpurposesandforthesettingstesting).
Asaroadslayer,youcanuseanypolylinevectorlayerinanyQGIS-supportedformat.Twolineswithacommon
pointareconsideredconnected.Pleasenote,itisrequiredtouselayerCRSasprojectCRSwhileeditingaroads
layer.ThisisduetothefactthatrecalculationofthecoordinatesbetweendifferentCRSsintroducessomeerrors
thatcanresultindiscontinuities,evenwhen‘snapping’isused.
Inthelayerattributetable,thefollowingfieldscanbeused:
19.15. RoadGraphPlugin
277
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C# DLLs: Preview PowerPoint Document. Add necessary XDoc.PowerPoint DLL libraries into your created C# application as references. RasterEdge.Imaging.Basic.dll.
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QGISUserGuide,Release2.2
Figure19.27:StyledheatmapofairportsofAlaska
Figure19.28:RoadGraphPlugin
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QGISUserGuide,Release2.2
• Speedonroadsection(numericfield).
• Direction(anytypethatcanbecasttostring).Forwardandreversedirectionscorrespondtoaone-wayroad,
bothdirectionsindicateatwo-wayroad.
Ifsomefieldsdon’thaveanyvalueordonotexist,defaultvaluesareused. Youcanchangedefaultsandsome
pluginsettingsinthepluginsettingsdialog.
19.15.1 Usingtheplugin
Afterpluginactivation,youwillseeanadditionalpanelontheleftsideofthemainQGISwindow. Now,en-
tersomeparameters intotheRoadgraphpluginsettingsdialogintheVectorRoadGraphmenu(seefig-
ure_road_graph_2).
Figure19.29:Roadgraphpluginsettings
AftersettingtheTimeunit,DistanceunitandTopologytolerance,youcanchoosethevectorlayerintheTrans-
portationlayertab.HereyoucanalsochoosetheDirectionfieldandSpeedfield.IntheDefaultsettingstab,you
cansettheDirectionforthecalculation.
Finally,intheShortestPathpanel,selectaStartandaStoppointintheroadnetworklayerandclickon[Calcu-
late].
.
19.16 SpatialQueryPlugin
The
SpatialQueryPlugin allowsyoutomakeaspatialquery(i.e.,selectfeatures)inatargetlayerwithreferenceto
anotherlayer.ThefunctionalityisbasedontheGEOSlibraryanddependsontheselectedsourcefeaturelayer.
Possibleoperatorsare:
• Contains
• Equals
• Overlap
19.16. SpatialQueryPlugin
279
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QGISUserGuide,Release2.2
• Crosses
• Intersects
• Isdisjoint
• Touches
• Within
19.16.1 Usingtheplugin
Asanexample, wewanttofindregionsintheAlaskadatasetthatcontainairports. . Thefollowingstepsare
necessary:
1. StartQGISandloadthevectorlayersregions.shpandairports.shp.
2. Loadthe e Spatial Queryplugininthe PluginManager(seeThe Plugins Menus)andclickonthe
SpatialQuery
icon,whichappearsintheQGIStoolbarmenu.Theplugindialogappears.
3. Selectthelayerregionsasthesourcelayerandairportsasthereferencefeaturelayer.
4. Select‘Contains’astheoperatorandclick[Apply].
NowyougetalistoffeatureIDsfromthequeryandyouhaveseveraloptions,asshowninfigure_spatial_query_1.
• Clickon
Createlayerwithlistofitems
.
• SelectanIDfromthelistandclickon
Createlayerwithselected
.
• Select‘Removefromcurrentselection’inthefieldAndusetheresultto
.
• Additionally,youcan
Zoomtoitemordisplay
Logmessages.
Figure19.30:SpatialQueryanalysis-regionscontainairports
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C# HTML5 Viewer: Load, View, Convert, Annotate and Edit Raster
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QGISUserGuide,Release2.2
.
19.17 SPITPlugin
QGIScomeswithapluginnamedSPIT(ShapefiletoPostGISImportTool). SPITcanbeusedtoloadmultiple
shapefilesatonetimeandincludessupportforschemas.TouseSPIT,openthePluginManagerfromthePlugins
menu,inthe
Installedmenuchecktheboxnexttothe
SPITandclick[OK].
Toimportashapefile,useDatabaseSpitImportShapefilestoPostgreSQLfromthemenubartoopenthe
SPIT-ShapefiletoPostGISImportTooldialog.SelectthePostGISdatabaseyouwanttoconnecttoandclickon
[Connect].Ifyouwant,youcandefineorchangesomeimportoptions.Nowyoucanaddoneormorefilestothe
queuebyclickingonthe[Add]button.Toprocessthefiles,clickonthe[OK]button.Theprogressoftheimport
aswellasanyerrors/warningswillbedisplayedaseachshapefileisprocessed. .
Figure19.31:UsingSPITPlugintoimportShapefilestoPostGIS
19.18 SQLAnywherePlugin
SQLAnywhereisaproprietaryrelationaldatabasemanagementsystem(RDBMS)fromSybase.SQLAnywhere
providesspatialsupport, includingOGC,shapefilesandbuilt-infunctionstoexporttoKML, GMLandSVG
formats.
SQLAnywhere
allowsyoutoconnecttospatiallyenabledSQLAnywheredatabases. TheAddSQLAnywhere
layerdialogissimilarinfunctionalitytothedialogsforPostGISandSpatiaLite.
.
19.17. SPITPlugin
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Figure19.32:SQLAnywheredialog(KDE)
19.19 TopologyCheckerPlugin
Topologydescribestherelationshipsbetweenpoints,linesandpolygonsthatrepresentthefeaturesofageographic
region.WiththeTopologyCheckerplugin,youcanlookoveryourvectorfilesandcheckthetopologywithseveral
topologyrules. Theserulescheckwithspatialrelationswhetheryourfeatures‘Equal’,‘Contain’,‘Cover’,are
‘CoveredBy’,‘Cross’, are‘Disjoint’,‘Intersect’,‘Overlap’,‘Touch’orare‘Within’eachother. . Itdependson
yourindividualquestionswhichtopologyrulesyouapplytoyourvectordata(e.g.,normallyyouwon’taccept
overshootsinlinelayers,butiftheydepictdead-endstreetsyouwon’tremovethemfromyourvectorlayer).
QGIShasabuilt-intopologicaleditingfeature,whichisgreatforcreatingnewfeatureswithouterrors.Butexisting
dataerrorsanduser-inducederrorsarehardtofind.Thispluginhelpsyoufindsucherrorsthroughalistofrules.
ItisverysimpletocreatetopologyruleswiththeTopologyCheckerplugin.
Onpointlayersthefollowingrulesareavailable:
• Mustbecoveredby:Hereyoucanchooseavectorlayerfromyourproject.Pointsthataren’tcoveredby
thegivenvectorlayeroccurinthe‘Error’field.
• Mustbecoveredbyendpointsof:Hereyoucanchoosealinelayerfromyourproject.
• Mustbeinside: : Hereyoucanchooseapolygonlayerfromyourproject. . Thepointsmustbeinsidea
polygon.Otherwise,QGISwritesan‘Error’forthepoint.
• Mustnothaveduplicates:Wheneverapointisrepresentedtwiceormore,itwilloccurinthe‘Error’field.
• Mustnothaveinvalidgeometries:Checkswhetherthegeometriesarevalid.
• Mustnothavemulti-part-geometries:Allmulti-partpointsarewrittenintothe‘Error’field.
Onlinelayers,thefollowingrulesareavailable:
• Endpointsmustbecoveredby:Hereyoucanselectapointlayerfromyourproject.
• Mustnothavedangles:Thiswillshowtheovershootsinthelinelayer.
• Mustnothaveduplicates:Wheneveralinefeatureisrepresentedtwiceormore,itwilloccurinthe‘Error’
field.
• Mustnothaveinvalidgeometries:Checkswhetherthegeometriesarevalid.
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Figure19.33:TheTopologyCheckerPlugin
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• Mustnothavemulti-partgeometries:Sometimes,ageometryisactuallyacollectionofsimple(single-
part)geometries. Suchageometryiscalledmulti-partgeometry. Ifitcontainsjustonetypeofsimple
geometry,wecallitmulti-point,multi-linestringormulti-polygon.Allmulti-partlinesarewrittenintothe
‘Error’field.
• Mustnothavepseudos: Alinegeometry’sendpointshouldbeconnectedtotheendpointsoftwoother
geometries. Iftheendpointisconnectedtoonlyoneothergeometry’sendpoint,theendpointiscalleda
psuedonode.
Onpolygonlayers,thefollowingrulesareavailable:
• Mustcontain:Polygonlayermustcontainatleastonepointgeometryfromthesecondlayer.
• Mustnothaveduplicates:Polygonsfromthesamelayermustnothaveidenticalgeometries.Whenevera
polygonfeatureisrepresentedtwiceormoreitwilloccurinthe‘Error’field.
• Mustnothavegaps:Adjacentpolygonsshouldnotformgapsbetweenthem. . Administrativeboundaries
couldbementionedasanexample(USstatepolygonsdonothaveanygapsbetweenthem...).
• Mustnothaveinvalidgeometries:Checkswhetherthegeometriesarevalid.Someoftherulesthatdefine
avalidgeometryare:
– Polygonringsmustclose.
– Ringsthatdefineholesshouldbeinsideringsthatdefineexteriorboundaries.
– Ringsmaynotself-intersect(theymayneithertouchnorcrossoneanother).
– Ringsmaynottouchotherrings,exceptatapoint.
• Mustnothavemulti-partgeometries:Sometimes,ageometryisactuallyacollectionofsimple(single-
part)geometries. Suchageometryiscalledmulti-partgeometry. Ifitcontainsjustonetypeofsimple
geometry,wecallitmulti-point,multi-linestringormulti-polygon. Forexample,acountryconsistingof
multipleislandscanberepresentedasamulti-polygon.
• Mustnotoverlap:Adjacentpolygonsshouldnotsharecommonarea.
• Mustnotoverlapwith:Adjacentpolygonsfromonelayershouldnotsharecommonareawithpolygons
fromanotherlayer.
.
19.20 ZonalStatisticsPlugin
Withthe
Zonalstatistics plugin, youcananalyzethe results ofathematic classification. . Itallows s you
tocalculateseveralvalues ofthepixelsofarasterlayerwiththehelpofapolygonalvectorlayer(seefig-
ure_zonal_statistics).Youcancalculatethesum,themeanvalueandthetotalcountofthepixelsthatarewithina
polygon.Theplugingeneratesoutputcolumnsinthevectorlayerwithauser-definedprefix.
.
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