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Issues Related to Remeasuring Annual Plots and Mapped Conditions

Issues Related to Remeasuring Annual Plots and Mapped Conditions. National User’s Group Meeting Houston, Texas. John Vissage U. S. Forest Service Northern Research Station Saint Paul, MN jvissage@fs.fed.us. What are Remeasured Annual Plots?. Any annual inventory after the first one

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Issues Related to Remeasuring Annual Plots and Mapped Conditions

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  1. Issues Related to Remeasuring Annual Plots and Mapped Conditions National User’s Group Meeting Houston, Texas John Vissage U. S. Forest Service Northern Research Station Saint Paul, MN jvissage@fs.fed.us

  2. 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

  3. What can ‘go wrong’? • If it can go wrong it will go wrong • If it can’t go wrong it will go wrong

  4. “Noise” Data that should notchange, changes. Tree species Reserved Class Site Productivity Class Data that should change, changes in a strange way. DBH/DIA shrinks Total height gets shorter Rotten cull decreases Ownership

  5. 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

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

  7. 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:

  8. Got Downloaded 4.0 FIADB data? Now What?

  9. 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

  10. SUBP_COND_CHGN _MTRX (Subplot condition change matrix) • CN (sequence number) • STATECD • SUBP • SUBPTYP • PLT_CN • CONDID • PREV_PLT_CN • PREVCOND • SUBPTYP_PROP_CHNG

  11. Portion of change matrix table, Minnesota 2008

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

  13. Latest remeasurement data on web Annual-to-annual remeasurement Periodic-to-annual accounting Annual Inventory initial installation Periodic data

  14. ThankYou!

  15. --Example 4.15 Estimate area change (acres) by condition status and stand size at two points in time, East Texas SELECTc_past.cond_status_cdpast_cond_status_cd, c_past.stdszcdpast_stdszcd, c.cond_status_cdcurrent_status_cd, c.stdszcdcurrent_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 FROMcond 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 andpet.eval_typ = 'EXPGROW' AND (c.cond_status_cd = 1orc_past.cond_status_cd = 1) ANDpop_plot_stratum_assgn.plt_cn = p.cn ANDpop_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 ANDpet.eval_grp_cn = pop_eval_grp.cn ANDpop_eval_grp.eval_grp = 272008-- the desired evaluation group must be specified. ANDp.prev_plt_cn = C_PAST.plt_cn AND CMX.PREV_PLT_CN = C_PAST.PLT_CN ANDCMX.prevcond = C_PAST.condid ANDCMX.condid = c.condid AND ((CMX.SUBPTYP = 3andc.prop_basis = 'MACR') or (CMX.SUBPTYP = 1andc.prop_basis = 'SUBP')) groupbyc_past.cond_status_cd, c_past.stdszcd, c.cond_status_cd, c.stdszcd

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