National User’s Group Meeting Houston, Texas John Vissage U. S. Forest Service Northern Research...

Issues Related to Remeasuring Annual Plots

and Mapped Conditions

National User’s Group Meeting Houston, Texas

John VissageU. S. Forest Service

Northern Research StationSaint Paul, MN

jvissage@fs.fed.us

What are Remeasured Annual Plots?

Any annual inventory after the first one Same plot footprint at the same place Account for trees measured on plot that

was forested at prior visit

Isn’t ‘remeasured’ from a periodic survey

What can ‘go wrong’?

If it can go wrong it will go wrong If it can’t go wrong it will go wrong

“Noise”

Data that should not change, changes.

Tree speciesReserved ClassSite Productivity Class

Data that should change, changes in a strange way.

DBH/DIA shrinksTotal height gets

shorterRotten cull decreasesOwnership

On-line tools

FIDO and EVALIDator

Produce estimates of growth, removals, and mortality

EVALIDator produces growth, removals, and mortality estimates by current and prior attributes

FIA Data Mart

Allows users to download FIADB tables

Previous land use Total Timberland

Reserved Forestland

Other forestland Nonforest

Non-Census water

Census water

Total 721,272,463 643,744,632 - 358,794 73,654,880 3,291,488 222,669

Timberland 721,272,463 643,744,632 - 358,794 73,654,880 3,291,488 222,669Reserved Forestland - - - - - - -Other forestland - - - - - - -

Nonforest - - - - - - -

Non-Census water - - - - - - -Census water - - - - - - -

Hazardous - - - - - - -

Removals by previous land use and current land use, East Texas, 2008 (From EVALIDator)

Timberland89%

Nonforest10%

Non-Census water0%

Other forest land0% Census Water

0%

Removals of growing stock from timberland by current land use, East Texas, 2008

Stand origin

Previous stand origin

Total Natural standsClear evidence of

artificial regeneration

Other

Total928,848,13

5572,038,362 349,671,772 7,138,002

Natural stands

487,279,535

453,855,613 28,585,398 4,838,524

Clear evidence of artificial regeneration

366,799,107

44,870,631 319,628,998 2,299,477

Other 74,769,493 73,312,118 1,457,375 -

Estimate type Net growth of growing-stock on timberland (cuft per year)Statecd/EVALID(s): RSCD=33 EVALID=480803 TEXAS(EAST) 2008Page variable=NoneRow variable=Previous stand originColumn variable=Stand originEstimate:

52%39%

8%

Average annual net growth of grow-ing stock by previous stand origin

Natural standsClear evidence of artificial regenera-tionOther

62%

38%

1%

Average annual net growth of grow-ing stock by current stand origin

Natural standsClear evidence of artificial regenera-tionOther

Got Downloaded 4.0 FIADB data?

Now What?

Some of the attributes that link remeasured annual plots

PREV_PLOT_CN (previous plot sequence number)

PREV_SBP_CN PREV_SIT_CN PREV_STATUS_CD PREV_TRE_CN PREVCOND PREVDIA

SUBP_COND_CHGN _MTRX

CN (sequence number) STATECD SUBP SUBPTYP PLT_CN CONDID PREV_PLT_CN PREVCOND SUBPTYP_PROP_CHNG

(Subplot condition change matrix)

Past Condition Status

Past stand –size class

Current condition status

Current stand –size class

Estimate CountPlot area

1 2 1 3607046.314

9 733 169.2647

1 1 1 2 274577.301 337 77.0061

1 3 1 1155524.004

4 191 41.947475

1 1 1 552143.1874

5 55 12.2335

Portion of change matrix table, Minnesota 2008

Past stand size class

Current stand size class Total

Sawtimber Poletimber

Seedling -sapling

Nonstocked

Other

Sawtimber

3,578,440 274,577

389,032

52,143

82,805 4,376,998

Poletimber

807,157 4,697,077

607,046

39,338

84,252 6,234,870

Seedling –Sapling

155,524 668,194

4,311,141

55,871

100,285 5,291,015

Nonstocked

15,422 14,809

93,565

56,522

47,601 227,919

Other 276,398

295,435

616,656

69,185 1,257,674

Total 4,832,940

5,950,093

6,017,441

273,059

314,944 17,388,476

Forest area change by past and current stand size class, Minnesota 2008

Latest remeasurement data on web

Annual-to-annual remeasurement

Periodic-to-annual accounting

Annual Inventory initial installation

Periodic data

THANK YOU!

--Example 4.15 Estimate area change (acres) by condition status and stand size at two points in time, East TexasSELECT c_past.cond_status_cd past_cond_status_cd, c_past.stdszcd past_stdszcd, c.cond_status_cd current_status_cd, c.stdszcd current_stdszcd, SUM(pop_stratum.expns * CMX.subptyp_prop_chng / 4 * decode(c.prop_basis, 'MACR', pop_stratum.adj_factor_macr, pop_stratum.adj_factor_subp) -- expression from the ref_pop_attribute table ) estimate, count(*) COUNT, SUM(CMX.subptyp_prop_chng / 4) PLOT_AREA FROM cond c, plot p, pop_plot_stratum_assgn, pop_stratum, pop_estn_unit, pop_eval, pop_eval_typ pet, pop_eval_grp, cond C_PAST, subp_cond_chng_mtrx CMX WHERE p.cn = c.plt_cn and pet.eval_typ = 'EXPGROW' AND (c.cond_status_cd = 1 or c_past.cond_status_cd = 1) AND pop_plot_stratum_assgn.plt_cn = p.cn AND pop_plot_stratum_assgn.stratum_cn = pop_stratum.cn AND pop_estn_unit.cn = pop_stratum.estn_unit_cn AND pop_eval.cn = pop_estn_unit.eval_cn AND pop_eval.cn = pet.eval_cn AND pet.eval_grp_cn = pop_eval_grp.cn AND pop_eval_grp.eval_grp = 272008 -- the desired evaluation group must be specified. AND p.prev_plt_cn = C_PAST.plt_cn AND CMX.PREV_PLT_CN = C_PAST.PLT_CN AND CMX.prevcond = C_PAST.condid AND CMX.condid = c.condid AND ((CMX.SUBPTYP = 3 and c.prop_basis = 'MACR') or (CMX.SUBPTYP = 1 and c.prop_basis = 'SUBP')) group by c_past.cond_status_cd, c_past.stdszcd, c.cond_status_cd, c.stdszcd