Presentation on theme: "Chapter 11 Basic Editing in ArcMap. Objectives Understanding the basic editing process Using snapping to ensure topological integrity of features Adding."— Presentation transcript:
Objectives Understanding the basic editing process Using snapping to ensure topological integrity of features Adding features to map layers Using the sketch tools and context menus for detailed and precise location of features Entering and editing attribute data
What can you edit? ArcView –Shapefiles and geodatabase feature classes ArcEditor and ArcInfo –Geodatabase networks –Geodatabase topologic features –ArcInfo coverages (not recommended)
The Editing Toolbar Menu Select Sketch toolTarget Split Rotate Shared edit Attributes Taskbar
Snapping A dangle—the two lines fail to connect Correct topology—the horizontal line intersects the vertical one, creating three lines. node Automatically connects features
Snap distance a c b a c b Features that fall inside snap distance are automatically connected to each other.
Types of snapping End snapping Edge snapping Vertex snapping ? Snap distance
Editing features The select tool, sketch tool, and task bar work together when editing Select tool Sketch tool
Target Layer Controls which layer new features will be placed in.
Creating a feature Double-click to finish sketch
Editing context menus Vertex menu Sketch menu Right-click on sketch Right-click off sketch
Sketch menu options 0 Enter absolute point Enter change in xy Constrain angle Constrain length
More options 90 45 Deflect from sketch Parallel to feature Deflect from feature Bearing and distance
Adjacent polygons gap Topological errors between two polygons Coincident boundary between two polygons overlap
Creating adjacent polygons Draw first polygon with Create New Task Add new polygon with AutoComplete Two polygons with coincident boundary.
More tricks Multipart features Perpendicular edge snapping
More sketch tools DistanceArc tool Intersection Trace tool
Modifying a feature Click and drag vertices Sketch keeps track of new figure shape Double-click when finished
Rotating features Select feature Rotate tool Drag around rotation point Click and drag to move rotation point
Splitting polygons Select polygon to split Sketch new boundary Double-click to finish sketch and create polygons
Attribute Editor Selected features Edit all selected Edit single feature Explore features
Saving work Save early, save often!!! Stops editing and asks to save any unsaved edits Saves and continues editing
Coordinate systems ArcMap can edit across coordinate systems –Edited coordinates always saved to source file coordinate system regardless of data frame coordinate system Projecting on-the-fly may degrade performance –Avoid it when possible
TIPS Always have a backup copy Shapefiles simplest and most robust Keep number of open files down Try to keep layers in same coordinate system Save frequently!!!!!