FIA• Forest Inventory Analysis

• Plots in forests over the US– Coordinates “fuzzed” at 1km– Tree species and characteristics– Resampled every decade

• FIA database:– Downloadable by state– CSV files or MS-Access– “CN” for primary keys– Includes complete database dictionary!

MS-Access

• Part of MS-Office professional

• Relational database– No concurrent access– No spatial extensions

• Has some unique characteristics– Brackets on field names: [Field1]

• “Easy to Use” wizards for queries– Can get to SQL statements behind the

wizards

Query Wizards

Select Tables and Fields

Missing Relationships

FIA Relationships

http://jan.ucc.nau.edu/~rcb7/namNm15.jpg

Query Options

Add Tables

Add Tables (con’t)

http://jan.ucc.nau.edu/~rcb7/namNm15.jpg

Adding Joins

Drag to Join Tables

SQL View

SELECT PLOT.[CN]

FROM

(PLOT INNER JOIN TREE ONPLOT.CN = TREE.PLT_CN)

INNER JOIN REF_SPECIES ON TREE.SPCD = REF_SPECIES.SPCD;

Add Field to Select

Select the field

Final Query – Wizard View

Datasheet View

SQL View

Sorting

Filtering

MS-Access

• Access uses “*” for a string wildcard

• Fieldnames are in brackets (sometimes)

• First “INNER JOIN” must be in parenthesis

Final Query

SELECT PLOT.[CN], PLOT.LAT, PLOT.LON,

REF_SPECIES.COMMON_NAME, TREE.HT

FROM (PLOT INNER JOIN TREE ON

PLOT.CN = TREE.PLT_CN)

INNER JOIN REF_SPECIES ON

TREE.SPCD = REF_SPECIES.SPCD

WHERE (((REF_SPECIES.COMMON_NAME) Like 'Doug*') AND ((TREE.HT)>200))

ORDER BY TREE.HT DESC;

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