Transcript WFM 6202: Remote Sensing and GIS in Water Management [Part-B: Geographic Information System (GIS)] Lecture-4(b): Geo-Database Akm Saiful Islam Institute of Water and Flood Management.

WFM 6202: Remote Sensing and GIS in Water
Management
[Part-B: Geographic Information System (GIS)]
Lecture-4(b): Geo-Database
Akm Saiful Islam
Institute of Water and Flood Management (IWFM)
Bangladesh University of Engineering and Technology (BUET)
December, 2008
Lecture Topic
• Understand basic Geodatabase
concepts and structure
• Know the advantages in using the
Geodatabase format
• Managing a GeoDatabase
• Creating GeoDatabase
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
First Generation
Storage/Linking
AS400
Database
Access
Database
Tabular Data
Spatial Data
•Tabular/Spatial data is linked outside the database
•Links occur using unique IDs….Parcel Numbers
•Storage is still in separate locations
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Second Generation Storage/Linking
Geodatabases
Tabular Data
Spatial Data
•Tabular/Spatial data is stored/linked in a single location!!
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Benefits of a GeoDatabase
o Spatial & attribute data integrity
o Intelligent Behavior
o Centralized Data Storage
o Increased Performance
o Advanced Analysis Capabilities
o Multi-user editing (SDE format)
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Benefits of Migrating to a
Geodatabase
Data Integrity
• Maintain tabular
data more efficiently
– Reduce typological
data errors
• Maintain spatial data
more efficiently
– Reduce spatial errors
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Pro-West & Associates
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
What is a Geodatabase?
• A spatial and
attribute data
container
– Relational database
management system
(RDBMS)
– Maintains data integrity
– Apply Rules and Behavior
• Native data format
for ArcGIS
Relational Database - A
method of structuring data as
collections of tables that are
logically associated to each
other by shared attributes. Any
data element can be found in a
relation by knowing the name of
the table, the attribute (column)
name, and the value of the
primary key.
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
2 Types of Geodatabase
• Personal Geodatabase
– Stand alone PC, MS Access database
– Supports individual and small groups on
moderate size datasets
• Enterprise Geodatabase
– Exists on underlying RDBMS through Spatial
Database Engine (SDE) e.g. SQL Server
– Usually runs on a dedicated server
– Supports many users and massive datasets
– Supports raster datasets
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Two types of GeoDatabases
• Personal
– Access
• Multi-user
– SDE
GIS
SDE
View/Anal
yze
Interpret
er
SQL
Data
Stora
ge
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
The Personal Geodatabase
It’s not Scary!
• Stores spatial and tabular
data in an Access database
format
• Sets the stage for future
SDE geodatbase migration
• Edit in ArcView, ArcEditor or
ArcInfo
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Geodatabase Features
Feature Dataset
• Contains
Topology
tables, feature
classes,
feature
Feature Classes
datasets,
topology
rules, etc.
Tables
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Geodatabase Elements
Geodatabase
Feature data set
Geometric network
Feature class
Relationship class
Table
Annotation class
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
GeoDatabase (GDB) structure
• Stores
– Feature datasets
– Feature classes
– Tables
– Raster
– More
• A unique structure within the GDB
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Feature Dataset
• Contains Feature
Classes
– Must have same
coordinate system
• Required for
Topology
– Behavior
relationships
between feature
classes.
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
GDB Objects: Feature Dataset
• A collection of feature classes
– Environment for spatial reference
– Environment for topology
– Environment for coincident geometry and linked
annotation
– Feature classes inherit spatial reference
• Data loaded are
projected on the fly,
if necessary
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Feature Class
• Stores a single
feature type
– Point, Line, Polygon
• Can be standalone
or member of a
Feature dataset
Feature Dataset
Feature Class
Stand Alone
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
GDB Objects: Feature Class (FC)
• A collection of features
– Each feature class has one geometry type (point,
multi-point, line, polygon)
• Can be stored in a
feature dataset or
‘stand-alone’
• Attributes are
stored with
coordinate data
in one table
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Spatial Reference
A
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Coordinate domain
• Extent of available
coordinates
– Min and max X,Y coordinates
– Precision = storage units per
map unit
• Example, 1000 mm per meter
• Make sure it covers study
area
– Allow for growth
• ArcCatalog default
– Import: data plus room for
growth
• Set your own
– Import from existing data
– Type in extent for study area
2.14 billion storage units
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Domain
• A property of a feature dataset or feature
class (cannot change once set)
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Domains
• Spatial
• Attribute
– Range of values (e.g., 0-100)
– Coded values (e.g., 1 = potatoes 2 = wheat)
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
The Spatial Domain
• The Geodatabase stores all geometry
coordinates as positive integers
– Faster Display, Processing, and Analysis
– Better Compression (DBMS only)
– Efficient for managing topologic relationships
• Limited to 2,147,423,647 storage units.
– 2.14x109 meters, or miles, or inches, or ...
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Accuracy and Precision
• Accuracy in the Data
– Scale of source map scale will determine accuracy*
• 1:600 (1”=50’)
± 1.7 feet
• 1:1,200 (1”=100’)
± 3.33 feet
• 1:2,400 (1”=200’)
± 6.67 feet
• 1:4,800 (1”=400’)
± 13.33 feet
• 1:24,000
± 40.00 feet
– Precision
• Ability to store the accuracy
– Significant digits
» Single precision
6-7 precise digits
» Double precision
13-14 precise digits
» Geodatabase 0-10 precise digits
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Example: Spatial Domain
• All GIS Features Must Fit Within this
Positive, 32-bit Integer Space.
2,147,423,647
2,147,423,647
0
0
The Database’s
Spatial Domain
OFF LIMITS
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Standard Fields
• Feature classes have default fields
– ObjectID – unique identifier
– Shape – contains coordinates of feature
– Area – automatically calculated and maintained for polygons
• Shape_Area (Personal GDB)
– Length – automatically calculated and maintained for lines
and polygons
• Shape_Length (Personal GDB)
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Spatial Reference
• Property of a feature class or feature dataset
• Components
– Coordinate system
– Coordinate domain
• Permanent after definition is saved
– Warning: it may look like you changed the coordinate
system, but you can’t and don’t try. It messes things
up!
• See next slide for more information
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Storing Feature Coordinates
Two important considerations when storing
feature coordinates in a Geodatabase:
1. All data is stored as positive, 32-bit
integers (Spatial Domain)
2. All data must maintain a Coordinate
Precision.
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Coordinate Precision
• The geodatabase converts all coordinates
into 32-bit Storage Units.
• Storage Units are the smallest
measurable unit that can be stored in a
Geodatabase.
• Precision is used to convert coordinate
system units into storage units.
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Example: Coordinate Precision
• Precision is a Scale Factor
– Used to preserve decimal places before
rounding
– Larger precision preserves more digits
X = 123.456789
Precision =1000
Floating Point
Coordinate in ArcGIS
(123.456000)
Multiply by Precision
123.456789 × 1000
Divide by Precision
123456 ÷ 1000
Integer Storage Unit
in a Geodatabase
(123456)
WFM 6202: Remote Sensing and GIS in Water
Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Example: Precision Preservation
Coordinate System Units
Storage Units =
Precision
Coordinate
system units
÷
Precision
=
Storage units
Meters
100
1 cm
Meters
1000
1 mm
Meters
50
2 cm
Feet
12
1 inch
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Topology Objects
• Maintain data integrity
– Within feature class
– Between feature class
• Feature Dataset required
•
• Functionality
– Display Topology
Errors
– Select and Correct
Errors
– Validation
Regarding map features,
topology is relationship
between features
connectivity and
adjacency.
• Geodatabase topology
provides tools to ensure
integrity of spatial data.
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Selected Topology Rules
• 25 available
topology
rules
• 2 Rules
currently
applied
– Must Not
Overlap
– Must Not
Have Gaps
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
File Management
• Compacting the
Personal
Geodatabase
– Reduces file size
• Procedure
– In ArcCatalog, right
click on the .mdb file
– Select the Compact
Database option in
the context menu
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Reference Data Locations
• Proscribed by the Standard for
Geospatial Dataset File Naming
– http://dlnt20.fsa.usda.gov/scdm/DP/Parent3.htm
• Standard folder structure on shared f: drive
• Geodata – top level geospatial data folder
• Local Geodata Administrators have authority
to create, delete, and change folders, but
only as outlined in the standards document.
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Data Management File Naming
Standards
• The current standard has 23 common
geospatial dataset categories such as soils
that consist of 1 or more geospatial datasets.
<disk drive>:
geodata
plants <geospatial dataset category (directory / folder)>
soils
<geospatial dataset category (directory / folder)>
soil_a_ks057
<geospatial dataset>
soil_p_ks057 <geospatial dataset>
soil_l_ks057 <geospatial dataset>
topographic_images
<geospatial
dataset category
(directory
/ folder)>
WFM 6202: Remote Sensing and
GIS in Water Management
© Dr. Akm Saiful
Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Data Management File
Naming Standards cont.
• Elements of a file name
soil_a_ks057
Feature
category
Location: Alpha
or numeric FIPS
code
Feature type: a-polygon, l-line,
p-point, t-table, i-image, etc.
A geospatial dataset file name should:
• be less than 30 characters long
• consist of lower case a-z and numerals 0-9
• first character always a-z
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Data Storage and Backup
• Shared data in a service center must be on the f: drive.
• Personal data can be stored on the c: drive or h: drive.
– c: drive is not routinely backed up.
– h: drive should contain important working files
that can be routinely backed up.
• Local Geodata Administrators are responsible for
ensuring backups are routinely being made of specific
directories.
– Large, easily replaced datasets should not be
routinely backed up because they can be obtained
again.
– Files and directories that change regularly should
be routinely
backed
up.
WFM 6202: Remote
Sensing and GIS
in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
GDB Design
• A critical step
• UML modeling for
ArcGIS
– IBM Rational Rose
– MS Visio
• Class diagrams
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Managing Your GDB
• ArcCatalog is your main tool to manage
the schema
– Construction of component parts
– Organization of those parts
– Properties for the parts
• Many capabilities are available
– Some are not on the default GUI
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Reading Schemas
Most data access technologies provide a way for you to query the
schema of a database, and obtain information about the tables,
stored procedures, data types, users, and other content of a database.
Logical
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Structural
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating a GDB
• Personal
– Use ArcCatalog
• Multi-user
– Must be done at the
system level
A
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating a new personal geodatabase
1. Open ArcCatalog
2. Choose a folder
location
3. Right click: Choose
New < Personal
Geodatabase
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating Feature Datasets
Right click your
geodatabase
Choose: New <
Feature Dataset
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating an empty feature class
• Two locations available: stand-alone and
within a feature dataset
A
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating a feature dataset
A
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating Feature Datasets
Right click your
geodatabase
Choose: New <
Feature Dataset
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Feature Datasets:
Setting the spatial reference
1. Set the
Projection
2. Set the Domain
• Precision
• Extent
http://arcscripts.esri.com/ :
Institute of Water and Flood Management (IWFM) , Bangladesh
University of
Engineering
and Technology
(BUET)
Search
on
Spatial
Domain
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Import existing data
•Navigate to the
feature dataset or
geodatabase icon in
ArcCatalog
•Right Click
•Choose Import
Use this to import
any existing format!
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Subtypes & Domains
Subtype:
•Distinguish features within a
single layer
•Maintain different domains within
the same field
•Need ArcEditor or ArcInfo
Domain:
•Identify & constrain attribute
values
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
•Can utilize
in ArcView
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Subtypes & Domains
Parcels
Example
Subtype:
Boundary Line
Domains:
ROW Type
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Subtypes
• Must be long or short integer fields
• Created in ArcEditor or ArcInfo
• Increases the efficiency of the editing process
• Use when
– Standardizing a legend
– distinguishing different default values/domains
within the same field
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating Subtypes
• In ArcCatalog
• Double click on a feature
class
• Select the Subtype tab
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating Domains
Created in
ArcCatalog
1. Double Click
on the
Personal
Geodatabase
Icon
2. Choose the
Domains tab
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating Domains—Assigning
to Feature Classes
In ArcCatalog
1. Double click a feature
class
2. Choose the Fields
tab
3. Highlight a field
4. Click Domain under
the Field properties
section
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating Domains—Assigning
default values
Set in the Field
Properties section
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Using Domains during the
Editing Process
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Geodatabase Topology
Putting the power into your hands
– Topology Rules
• Preset rules to define topological relationships to
ensure connectivity, adjacency and coincidence
– Can be changed at any time
– Topology Tools
• Maintain spatial relationships
• Toolbar and Tasks
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Pro-West & Associates
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Creating Topology
1. Rules
– Land use boundaries overlap parcel boundaries
– Manholes overlap sanitary line endpoints
2. Cluster Tolerance
– Min distance where vertices within tolerance are
snapped
3. Ranks
– Control what features move during validating
•
Surveyed points will not move (snap) during the validation
process
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Pro-West & Associates
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Validating Topology
• Validate edited features
using set topology rules
• Evaluate rules/tolerance
and generates error
notifications
• Snaps vertices using set
cluster tolerance and
ranks
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Pro-West & Associates
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Create a New Topology
• Created in ArcCatalog
• Created within a Feature
Dataset
• Topology Wizard
– Allows user to set Rules,
Ranks, Tolerance, and
perform initial Validation
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Pro-West & Associates
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Final Topology
When added to ArcMap,
will show errors from
the validation process
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Managing Topologies
• Right click on the Topology in ArcCatalog
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Topology Tools
Maintenance
• Standard toolbar in ArcView-ArcInfo
• Used in an editing environment in ArcMap
• Use in conjunction with Topology Tasks in
Editor Toolbar
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Pro-West & Associates
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Editor Toolbar
Maintenance
• Topology Tasks:
Modify, Auto Complete Polygon and Reshape
– Allows user to use basic editing tools
to alter vertices, replace lines, add
adjacent polygons or alter existing
polygons
– Use in conjunction with the Topology
Edit Tool on the Topology Toolbar
Remember:
Set snapping and snapping tolerance
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Flexible Editing
• Topology edit tool
– Allows for editing shared boundaries
– Builds a temporary topology cache within a
given extent
• Faster performance
• Must use each time your extent changes
• Show shared features tool
– Move a boundary without effecting shared
boundaries (temporary)
• Parcels & land use
• Parcels and easements
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Pro-West & Associates
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Validate & Fix
• Validate after editing is complete
– Errors are highlighted
• Click the Fix Error button
• Select a feature and right click
– Fix
– Mark as an Exception
– Do Nothing
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Process in Review
1. Plan for success
2. Import data
3. Set Subtypes &
Domains
4. Create Topology
5. Start editing!
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Pro-West & Associates
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Tips
• Projecting data
– Must create a new feature class
• PGDB is 2 GB max
• Read-only on a PGDB will restrict some
analyses, such as Select by Location
• Use compact to clean up temporary files
• All table names need to be unique
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)
Ex 2
•
•
•
•
Create a Personal GDB
Create an empty Feature Class
Create a Feature Dataset
Create a Feature Class within the Feature
Dataset
WFM 6202: Remote Sensing and GIS in Water Management © Dr. Akm Saiful Islam
Institute of Water and Flood Management (IWFM) , Bangladesh University of Engineering and Technology (BUET)