1

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

2

Adding layer

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

3

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

4

The mapcolorchangesand so doesUnguja_Admin polygonsymbol (thesquare).

5

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

6

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

7

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

8

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.

9

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

10

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.

11

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

12

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

13

• Your mapwill looklike this

14

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.

15

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

16

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

17

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

19

• Open attributetable, the selectedfeature shown inboth attribute andmap

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