esri uc 2014 | technical workshop | data alignment and management in arcmap lisa stanners, sean...
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Esri UC 2014 | Technical Workshop |
Data Alignment and Management in ArcMapLisa Stanners, Sean Jones
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Esri UC 2014 | Technical Workshop |
Agenda
• The need for data alignment
• Review tools available for improving spatial accuracy of your data- Spatial adjustment & Rubbersheeting
- Snapping capabilities, tracing tools, auto-complete, etc.
- Alignment tools
• Review tools available to maintaining accuracy & coincidence- Map Topologies & Geodatabase Topologies
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Data Alignment
• Many GIS domains have continuous data (Forestry, geology, land use, parcels, etc.)
• Spatially accurate data not always a priority
• Data sharing increased demand for accuracy
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Data Alignment
Common scenarios:
1.Editing without regards to spatial integrity.
2.Different data sources.
3.Features created or updated at different points in time.
4.Features created at different map scales.
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Spatial Adjustment
• Shift data between coordinate systems
Projections
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Spatial Adjustment
• Shift data in coordinate space- Digitize coordinates to real world
- CAD coordinates to real world
- Meters to Feet
Transformations
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Spatial Adjustment
• Aligns local data
• Integrating data from different scales and sources- Integrate 250K Hydro features into 50K data
- Align national roads with local roads
Rubber Sheeting
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |Esri UC 2014 | Technical Workshop |
Spatial Adjustment Demo
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Summary of Adjustment Process
• Create Links• Set Adjust source• Set Adjustment Method• Preview• Adjust
Data Alignment and Management in ArcMap
Set Adjustment Source
Create LinkElements
PreviewAdjustment
Adjust data
Set Adjustment Method
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Esri UC 2014 | Technical Workshop |
Keeping Your Data Aligned
• Know what the basic tools are and how to use them- Snapping environment
- Basic snapping
- “Classic” snapping
- Snap to feature
- Auto-Complete (polygon and freehand)
- Trace construction tool
- Extend and Trim tools
- Auxiliary anchor (Rotate and Scale tools)
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Keeping Your Data Aligned
• New tools introduced at 10.1 to help with this process:- Align To Shape – adjust layers to traced shape
- Align Edge – snap edges together to close gaps
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Geoprocessing Alignment Tools
• Snap – bulk snapping based on user specified rules- Edit session
• Integrate
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |Esri UC 2014 | Technical Workshop |
Aligning DataDemo
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Topologies – Why would you want to use one?
Two main reasons for using a topology:1. Tools for editing coincident
geometries between feature classes
2. Tools for finding and fixing errors based on rules you define
Data Alignment and Management in ArcMap
Move a parcel boundary
Move a pipe and its valvesSoil polygons must not overlap
Err
orFind error Fix error
Streets must not intersect
Find error Fix error
Intersection errorM
ainFirst
FirstM
ain
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ain FirstM
ain
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Esri UC 2014 | Technical Workshop |
Topologies – What kinds are there?
Two types of topologies:
1. Map Topologies (requires only ArcView license)- Can be used with feature classes or shapefiles in same
workspace
- Not persisted, but saved in map document
2. Geodatabase Topologies (requires ArcEditor license)- Allows rules to be defined and errors found
- Must be used with feature classes in same dataset
- Persisted in the database
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Topologies – Editing coincident geometries
• Tools to select topology elements- Topology Edit Tool
- Topology Edit Trace Tool
• Tools to update topology elements- Modify Edge
- Reshape Edge
- Align Edge
- Generalize Edge
- Reconnect Nodes
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |Esri UC 2014 | Technical Workshop |
Topology Editing Tools Demo
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Geodatabase Topologies – Topology Rules
• 32 topology rules
• Single or multiple feature classes
• Apply to feature class or subtype level
• Categorized by geometry type (polygon, line, point)
• Examples- Soil polygons can’t have gaps between them
- Parcels can’t overlap
- Address points must be inside parcels
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Geodatabase Topologies – Validating a Topology
• Integrates geometries based on a cluster tolerance- Cracking –Vertices added at intersections of feature edges
- Clustering – Snapping vertices that fall within cluster tolerance
• Validates topology rules which may generate errors - Deletes errors if the rules are no longer violated
• No new features are created
Data Alignment and Management in ArcMap
AfterAfter
CrackingCracking ClusteringClustering
BeforeBefore
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Esri UC 2014 | Technical Workshop |
Geodatabase Topologies – Error Inspector
• Error Inspector lets you view and fix topology errors in a table.– The rule violated
– The feature class or classes involved in the error
– The geometry of the error
– The feature ID of the features involved in the error
– Whether or not the error has been marked as an exception
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Geodatabase Topologies – Editing Errors
• Topology errors represent violations of topology rules. Need to edit the features to remove the topology errors.
– Errors cannot be deleted directly, the features must be edited and the topology re-validated
– Three options for correcting errors:- Leave the error in the database
- Fix the error
- Elevate the error to exception status. This allows you to say this rule applies everywhere except ‘here’
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Geodatabase Topologies – Editing Errors
• Select the topology errors on the map- Creates an “Active Error Selection”
- Context menu with fixes based on rule
• Revalidate after edits
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |Esri UC 2014 | Technical Workshop |
Topology ErrorsDemo
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Summary of Topologies
• If you just need to edit coincident boundaries – consider a map topology
• If you need to define and validate rules – use a geodatabase topology
• With geodatabase topologies:- Build and validate to improve spatial integrity between your data layers
- Use the available editor tools to find and fix your errors
- Use automated fixes as much as you can, but they aren’t the answer for every error
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop |
Thank you…
• Please fill out the session survey:
First Offering ID: 1311
Second Offering ID: 1395
Online – www.esri.com/ucsessionsurveys
Paper – pick up and put in drop box
Data Alignment and Management in ArcMap
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Esri UC 2014 | Technical Workshop | Data Alignment and Management in ArcMap