1. Working Spatial Data File Geodatabase
March 30, 2016
RG620
File Geodatabase stores map layers, data tables and other GIS file types in a system folder (*.gdb).

2. File Geodatabase Collection of files in a file folder
Use ArcCatalog to maintain File Geodatabase

3. Tutorial 4-1:Build a File Geodatabase
Open ArcCatalog
Create an empty file geodatabase
MyExercise->Chapter4
Right click Chapter4 and click New, File Geodatabase
Import shapefiles tgr04013ccd00 and tgr04013trt from GIST1\Data\MaricopaCounty
Import a data table CensusDat.dbf
Rename Features
tgr04013ccd00 to Cities
tgr04013trt to Tracts
CensusDat to CensusTractData
Create new map document Tutorial4-1.mxd and add above layers and table
Collection of files in a file folder.
Right click on file geodatabase and click import and then browse to the folder where data (feature class (multiple), Table (single), etc.) is saved.

4. ArcCatalog Utilities Preview layers
Click newly created File Geodatabase to look into its
Contents, Preview, Description (Metadata)
In right panel, click preview
Geography, Table,
Copy/delete layer
Compress/uncompress file geodatabase

5. Tutorial 4-3: Modify Attribute Table
Delete unneeded columns from Tracts
FIPSSTCO ID
TRT2000
TractID
Close table

6. Modify Primary Key and Add New Column
Tracts field STFID
CensusTractData field GEO_ID
Truncate GEO_ID to match STFID
Add filed in CensusTractData named STFID
Type = Text, Length = 11
Filed calculator: changed type from number to string
Double click the Mid() function in STFID =
Mid ([GEO_ID],8,11), ok

7. Calculate a New Column Add new field in CensusTarctData table
Name new field as RNatWht
Change type to float
Calculate ratio of Native American per capita income to White per capita income
Right click RNatWht column heading and click ‘Field Calculator’
In Field Calculator window click
PCINCNAT/PCINCWHT
Select PCINCWHT > 0 records only b/c it’s divisor for this ratio and anything divided by zero is undefined. First select by attribute then calculate ratio.

8. Your Turn!!
Calculate ratio of per capita income of Hispanics divided by the per capita income of whites

9. Join Tables
Join attributes from table CensusTractData to the polygon Tracts
Right Click Tracts layer
Click Joins and Relate then click Join
Join by field STFID
View Joined attribute table of the shapefile

10. Tutorial 4-5: Create Centroid in a Table
Add X, Y coordinates to a polygon attribute table
Tract Table: add 2 fields named ‘X’ and ‘Y’
Type = double
Right click X and Y columns and Calculate Geometry for both columns
Centroid of a polygon is the point at which the polygon would balance on a pencil point if it were cut out of cardboard.

11. Export Table In Table Option button click Export
Save as Type = File Geodatabase tables
Save as TractCentriods in File Geodatabase
When you export a joined table as a table, you get all the attributes of the joined table stored as one table permanently.

12. Create Feature Class from XY table
Through Catalog access to TractCentroids
Right click TractCentriods , click Create Feature Class and click from XY Table
Import Coordinate System as of Tracks
Save as CensusTractCentroids
Add CensusTractCentroids in ArcMap

13. Export a Subset of a Feature Class
How??????