ex.2 adding layers and changing symbolys colts-den.aluka.org/fsi/img/misc/pdf/chworkshop... ·...

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ADDING LAYERS AND CHANGINGSYMBOLYS COLOUR

•You can Adddata to a map inmany ways: oneis to drag-and-drop layers fromArcCatalog,another is to usethe Add Databutton

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Adding layer

• In ArcMap click Adddata button andnavigate toC:\GIS_Workshop\Unguja select theUnguja_Adminshapefile and

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CHANGING LAYER SYMBOLYS

• Right click the layer, in the layerproperties dialog, selectsymbology double clickcategories. Set layer sysmbolsto unique values based on theDISTRICT field. On a uniquevalues map, you draw featuresbased on an attribute value orcharacteristic that identifies it.In the map each Districtisdrawn with specific colour.

• Click Add All Values• Uncheck the All other values

box

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The mapcolorchangesand so doesUnguja_Admin polygonsymbol (thesquare).

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Displaying Map Tips

• In the table of contents,right-click the layerUnguja_Admin and clickProperties

• Click the Display tab

• Check show map tips

• Click Fields tab

• Click the Primary displayfield dropdown arrowand click the attributefield DISTRIC Click Ok

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• On the map display areamove the mouse pointerover a feature in the layerand pause to see the maptip

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Zooming the Layer

• Navigate to GIS_Workshop\Unguja\Archiologicalsitesselect Archeological_Sites_Unguja_Arc1960

• Click the zoom in button and draw box around theUrban Distric

• You can easily return to your last extent using

• And just as easily return to the zoomed in extentagain with the Go to Next extent button

• The full extent button on the toolbar is very useful

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Displaying Attributes of a Feature byClicking It

• Navigate toC:\GIS_Workshop\Unguja\ArcgeologicalSites folder and AddArcheological_Sites_Unguja_Arc1960shapefile. This filecontain the pointfeatures taken by GPSshowing thearcheological sites ofZanzibar.

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• Use the Identifybutton to clickon geographicalfeatures andquickly view itsattributes. Theresult for thefeature you clickedon appears in awindow

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Labeling Features

• Labeling is the process of placing adescriptive text string next to one or morefeatures on your map. Labels help a mapreader interpret a map. How you labelyour maps depends on the type of datayou are displaying, what feature you wantto label, and how you will ultimately usethe map.

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Labeling Features

• In the table of contents,right click the layer youwant to label and clickproperties in this caseselectArcheological_Sites_Unguja_Arch1960

• Click the Labels tab• Check Label Features• Click the Label Field

dropdown arrow and clickthe filed you want to useas a label select SITE

• Click OK

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Turning Labels On and Off

• In the table of contents,right click the layer andcheck Label Features toturn label on.

• Uncheck Label Featuresto turn them off

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• Your mapwill looklike this

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Creating Hyperlink

• Hyperlinks display documents (eg. Textfiles, images) or web pages accessed overthe internet. You can create hyperlinks asyou browse your map, or store hyperlinksalong with your data using an attributefiled.

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Creating Hyperlink

• Zoom in to the Urban District until you seethe Old Fort and House of Wonder

• Click the Identify Features button on theTools toolbar.

• Click a feature

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Creating Hyperlink

• In the Identify Resultwindow, right-click thefeature you want to seta hyperlink for and clickAdd Hyperlink

• Browse to select theC:\GIS_Workshop\Unguja\House_of_Wonder

• Click the Hyperlink toolon the tools toolbar andclick a feature

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Findig Features by Searching withan SQL Expression

• Uncheck label in archeological site layer

• Click Selections and Click Select By Attributes

• Click the Layer dropdown arrow and clickArcheological_Sites_Unguja_Arc1960

• Double-Click a field to add the field name to theexpression box SITE

• Click an operator to add It to the expression

• If you have a very large number of values, clickthe Get Unique Value to see them all

• Double click a value to add it to the expression

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• To see if you areusing proper syntaxor if the criteria youhave entered willselect any features,click the Verify button.

• Your dialog box willlook like this

• Click Ok

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• Open attributetable, the selectedfeature shown inboth attribute andmap

• The status bar atthe button of theattribute tablewindow tells youhow manyfeatures areselected