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

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Presentation on theme: "WFM 6202: Remote Sensing and GIS in Water Management Akm Saiful Islam [Part-B: Geographic Information System (GIS)] Lecture-4(b): Geo-Database December,"— Presentation transcript:

1 WFM 6202: Remote Sensing and GIS in Water Management Akm Saiful Islam [Part-B: Geographic Information System (GIS)] Lecture-4(b): Geo-Database December, 2008 Institute of Water and Flood Management (IWFM) Bangladesh University of Engineering and Technology (BUET)

2 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) Lecture Topic Understand basic Geodatabase concepts and structure Know the advantages in using the Geodatabase format Managing a GeoDatabase Creating GeoDatabase

3 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 DataSpatial Data Tabular/Spatial data is linked outside the database Links occur using unique IDs….Parcel Numbers Storage is still in separate locations

4 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!!

5 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) oSpatial & attribute data integrity oIntelligent Behavior oCentralized Data Storage oIncreased Performance oAdvanced Analysis Capabilities oMulti-user editing (SDE format) Benefits of a GeoDatabase

6 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 Pro-West & Associates

7 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) What is a Geodatabase? containerA 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.

8 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 GeodatabasePersonal Geodatabase –Stand alone PC, MS Access database –Supports individual and small groups on moderate size datasets Enterprise GeodatabaseEnterprise 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

9 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 SQL SDE Data Stora ge Interpret er View/Anal yze

10 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 Its 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

11 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 Contains tables, feature classes, feature datasets, topology rules, etc. Tables Feature Classes Topology Feature Dataset

12 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 data set Feature class Geometric network Annotation class Geodatabase Elements Geodatabase Relationship class Table

13 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

14 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.

15 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

16 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 Stand Alone Feature Dataset Feature Class

17 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

18 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

19 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

20 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)

21 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)

22 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. –2.14x10 9 meters, or miles, or inches, or...

23 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)± feet 1:24,000 ± feet –Precision Ability to store the accuracy –Significant digits »Single precision6-7 precise digits »Double precision13-14 precise digits »Geodatabase0-10 precise digits

24 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. OFF LIMITS2,147,423,6470 The Databases Spatial Domain

25 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)

26 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 cant and dont try. It messes things up! See next slide for more information

27 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.

28 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.

29 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 Floating Point Coordinate in ArcGIS ( ) Multiply by Precision × 1000 Divide by Precision ÷ 1000 Integer Storage Unit in a Geodatabase (123456) X = Precision =1000 Precision is a Scale Factor –Used to preserve decimal places before rounding –Larger precision preserves more digits

30 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 ÷ Precision = Storage units Meters1001 cm Meters10001 mm Meters502 cm Feet121 inch Coordinate System Units Precision Storage Units =

31 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.

32 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 rules25 available topology rules 2 Rules currently applied2 Rules currently applied –Must Not Overlap –Must Not Have Gaps

33 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

34 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.htmhttp://dlnt20.fsa.usda.gov/scdm/DP/Parent3.htm Standard folder structure on shared f: drive GeodataGeodata – top level geospatial data folder Local Geodata Administrators have authority to create, delete, and change folders, but only as outlined in the standards document.

35 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) : geodata soils soil_a_ks057 topographic_images plants soil_p_ks057 soil_l_ks057 The current standard has 23 common geospatial dataset categories such as soils that consist of 1 or more geospatial datasets. Data Management File Naming Standards

36 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) 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 soil_a_ks057 Elements of a file name Feature category Feature type: a-polygon, l-line, p-point, t-table, i-image, etc. Data Management File Naming Standards cont. Location: Alpha or numeric FIPS code

37 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. is not –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.

38 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

39 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

40 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 Structural Logical 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.

41 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 GDB Personal –Use ArcCatalog Multi-user –Must be done at the system level A

42 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) 1.Open ArcCatalog 2.Choose a folder location 3.Right click: Choose New < Personal Geodatabase Creating a new personal geodatabase

43 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) Right click your geodatabase Choose: New < Feature Dataset Creating Feature Datasets

44 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

45 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

46 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) Right click your geodatabase Choose: New < Feature Dataset Creating Feature Datasets

47 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 : Search on Spatial Domain 1.Set the Projection 2.Set the Domain Precision Extent

48 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) Import existing data Navigate to the feature dataset or geodatabase icon in ArcCatalog Right Click Choose Import Use this to import any existing format!

49 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 Can utilize in ArcView

50 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 Parcels Example Subtype: Boundary Line Domains: ROW Type

51 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

52 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

53 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

54 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 DomainsAssigning 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

55 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 DomainsAssigning default values Set in the Field Properties section

56 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

57 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 Pro-West & Associates

58 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 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 Pro-West & Associates

59 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) Validating Topology Validate edited features using set topology rules Evaluate rules/tolerance and generates error notifications Snaps vertices using set cluster tolerance and ranks Pro-West & Associates

60 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) 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 Pro-West & Associates

61 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) Final Topology When added to ArcMap, will show errors from the validation process

62 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

63 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 Pro-West & Associates

64 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) 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

65 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 Pro-West & Associates

66 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) 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

67 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! Pro-West & Associates

68 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) 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

69 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


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