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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This is the corollary data set to Combined Origin Year Raster, and is calculated as CURRENT YEAR - COMBINED ORIGIN YEAR.</SPAN></P><P><SPAN>Origin year is calculated from multiple data sources using the following logic: Origin year is reported at the pixel-level (1/10th ac scale). The default value is the predicted origin year, based on RS-FRIS models. These models rely on remotely sensed data (LiDAR and DAP) and are constructed primarily from height-to-age relationships. The default RS-FRIS predicted ages are overwritten using the following data, if available: Tree core data from DNR's historic inventory (FRIS) is used for stands whose origin year is 1900 or earlier. FRIS tree core data from younger stands (post-1900) or FRIS data based on stratified samples is used only if RS-FRIS data is not available. Information from LRM for completed harvests ('TEMP_RET_REM', 'TEMP_RET_1ST', 'VRH', 'SEEDTREE_INT', 'CLEAR_CUT', 'PATCH_REGEN', 'LANDUSE_CONV', 'SEEDTREE_REM', 'SHELTER_INT', 'SHELTER_REM'). STAND_ORIGIN_DT was used if populated, otherwise FMA_DT. </SPAN></P><P><SPAN>Data sources are mapped in the "Combined Origin Year Data Source" raster.</SPAN></P><P><SPAN>This data set is periodically updated. Last update performed 2024-09-17. </SPAN></P></DIV></DIV></DIV> |