fia forest inventory analysis plots in forests over the us –coordinates “fuzzed” at 1km...

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

Query Options

Add Tables

Add Tables (con’t)

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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