CE 597 Spring 2011

 Point  Line  Polygon  Thematic collections of points, lines, or polygons

 Annotation  Dimensions  Multipoints  Multipatches

Dimension Multi-points Multi-patches Images: ESRI

 Single/multi –part lines  Single/multi-part polygons

 Vertices: Primary elements  Vertices may include z-values: elevation m-values: measurements along line features Image: ESRI  Segments may be straight lines, circular arcs, elliptical arcs, or bezier curves

 XY tolerance: minimum distance separating feature coordinates (e.g m) used in clustering operations (topology validation, buffer generation, polygon overlay, clip, editing etc.)  XY resolution: precision to store coordinate values default: m

 Editor toolbar

 Editing tools are available only during an “edit session” (Editor > Start Editing, Stop Editing)  Edits are temporary until saved permanently to the data (Editor > Save Edits)  Saving the map document (*.mxd) doesn’t save the edits to the features !!

 May edit data in a single folder or a geodatabase at a time  May edit data of a single data frame at a time even if all the data in other data frames are in the same folder or geodatabase  May edit data having different coordinate systems (best practice: editing data which have the same coordinate system)

 Select the workspace and data frame to edit  Start an edit session  Select the target layer to edit  Choose either to create new features or edit existing ones  Set up additional properties or options e.g. snapping, setting selectable layers etc.  Select an editing tool  Add or edit attributes of the feature  Save edits and stop editing

 Sketch tool

 Intersection tool  Arc tool  Midpoint tool  Endpoint arc tool  Tangent curve tool  Distance-distance tool  Direction-distance tool  Trace tool

line sketch polygon sketch point sketch vertex segment

 Right click menu options vertex options general options

 Snapping environment helps to establish exact locations with respect to other features  May be used for generating, editing, or moving features

 Snapping tolerance Editor menu > Options > General tab Distance to snap a pointer or a feature within to another location

 Snapping properties  Snapping priority  Snapping environment dialog box Editor menu > snapping

 Snapping to a specific feature

 Distance units May choose while entering the distance using the unit’s abbreviation (e.g. km, m, ft, mi, yd)  Direction units Editor menu > Options > Units tab

 Select a feature using the editor toolbar  Switch to choose between possible selections within the tolerance to catch the right feature (by clicking N on keyboard)

 Helps to avoid moving the features accidentally while editing them which may cause unintended gaps or overlaps  Sets up a tolerance distance to start moving the feature  Set from: Editor > Options > General tab

 Activate snap tips to see where the snap will take place  Editor > Options > General tab