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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
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
