Census Mapping with ArcGIS

Transcription

1 Census Mapping with ArcGIS Jin Lee, GIS manager at the Lewis Mumford Center and Center for Social and Demographic Analysis Phone:

2 Quick summary of Day1

3 Day 2 topics Arc Catalog Geodatabase Data joining Design Thematic maps

4 Introduction to ArcCatalog Browse and manage data and database( Catalog tree) Preview data Preview attributes Create and view metadata

5 Introduction to ArcCatalog Start ArcCatalog by going to Start>Programs>A rcgis>arccatalog

6 Introduction to ArcCatalog Contents, Preview, and Metadata

7 Introduction to ArcCatalog Defining coordinate system of each layer (file) in ArcCatalog

8 Introduction to ArcCatalog Establish Connection in ArcCatalog to network database, outside servers, and databases

9 Introduction to ArcCatalog Create and manage Geodatabase

10 Types of ArcGIS files Map documents (.mxd) Shape files (.shp) Layer file (.lyr) Coverage Geodatabase

11 Geodatabase Multiple feature type storage Sub-Groupings of feature in feature dataset Control security and access in these subgroups Logically divide large databases into smaller more managable ones One RDBMS table stores both spatial and attribute data Types of geodatabases Personal geodatabase; Stored in Access. 2 GB size limit, but effective size is 250 to 500 MB per geodatabase. Windows only. Supports a single editor and a few readers. No versioning support. File geodatabase; Stored in a file folder. Up to 1 TB per dataset. Any platform. Supports a single editor and a few readers. No versioning support. ArcSDE geodatabase; Stored in a RDBMS (Oracle, SQL Server, DB2, Informix). Supports many editors and many readers. Uses ArcSDE. Provides versioning and multiuser support.

12 Shapefile Single feature type Data stored in dbase format Non-Topologic ArcView s native file structure

13 Shapefile Mandatory files :.shp shape format; the feature geometry itself.shx shape index format; a positional index of the feature geometry to allow seeking forwards and backwards quickly.dbf attribute format; columnar attributes for each shape, in dbase III format Optional files :.prj projection format; the coordinate system and projection information, a plain text file describing the projection using wellknown text format.sbn and.sbx a spatial index of the features.ixs a geocoding index for read-write shapefiles.mxs a geocoding index for read-write shapefiles (ODB format).shp.xml metadata in XML format

14 Layer Files *.lyr files can save defined symbology store original file path which help sharing data and with non technical staffs Vector Data Raster Data Data drawn in ArcMap Data with default symbology Data with defined symbology

15 Coverage Original ESRI Storage Unit Stores geographic features in directories with linkages to INFO databases in a separate directory Feature Classes - Point -Arc - Node - Polygon - Region (subclass) - Annotation (subclass)

16 Introduction to ArcCatalog Create my Geodatabese!

17

18 Associating Tables ( joining data) Ability to store attributes in a feature table or in a separate table Associate two tables with common key Must know about table relationship

19 Relationships One to One One to Many Many to One Many to Many

20 One to One Many to one

21 Joins in ArcGIS Must be one-to-one or many-to-one Must have common field (key) and same field type Be Careful on filed type A few tips on joining Now ArcGIS works with Excel!! Modify your data in Excel, not in arcgis Null into -999 ( no data), don t put 0

22 Design thematic maps Map symbology, classification, Labeling.

23 Design thematic maps Map symbology, classification, Labeling,

24 Exercise of data joining and thematic map design

25 That s it! HAVE A NICE WEEKEND!!