Forest site in Järvselja, Estonia: Summary of ground-based LAI measurements Tiit Nilson, Tartu Observatory.

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Presentation transcript:

Forest site in Järvselja, Estonia: Summary of ground-based LAI measurements Tiit Nilson, Tartu Observatory

Site location

SPOT Coniferous forests appear in dark, deciduous forests in green tones, recent clear cuts and open areas in pink and violet

Ground-based measurements: LAI-2000 and digital hemispheric photos Mixed forest dominated by birch, spruce and pine Managed forests, some forest have been cut, so some changes take place from year to year sample plots measured 3x3 km region measured in summer conditions 2001,2002 and 2003; in leafless broadleaves conditions November For some plots, LAI measurements are available from yr 2000 Angular distribution of gap fraction used Forest canopy LAI derived by Nilson’s algorithm, uses ancillary data from the forestry database

LAI-2000 results, average over all sample plots. Summer conditions LAI tree storeyLAI ground LAI total Year Nilson’s algorithm Forestry database LAI

Comparison of LAI-2000 and hemispheric photos CAN_EYE and GLA programs used to process the photos A tendency to overestimate gap fraction by the photographic method was noted, especially for broadleaves With automatic exposition control, typically the crowns and branches from the upper canopy are over-exposed in photos and could be treated as sky After the processing of photos is finished, a new round of the LAI estimation is foreseen

Agreement between LAI-2000 and photos can be rather good, especially for conifers A pine dominated stand

Agreement is typically worse for broadleaves A dense birch-dominated forest In some cases, large differences are found

LAI-2000 estimates on the same plots. Temporal trajectories from year to year Larger drops in LAI are related to documented cuttings LAI-2000 measurement error is quite large, partly because of non-favorable weather conditions during measurements

A candidate for the transfer function: Reduced Simple Ratio (RSR). An example from an atmospherically corrected SPOT4 image of 2 July Total LAI from ground-based LAI-2000 measurements

RSR of two adjacent years

Work still ongoing

Very exotic conditions, late fall