Reminder: GT6 feasibility study

Transcription

1 Characterization of forest features Limousin test site Nicolas STACH and Michel DESHAYES 21/05/2008 ORFEO GT 6 1/17 Reminder: GT6 feasibility study CONTEXT of GT6 forest feasibility study: Massif development plans : new strategy to carry out forest development actions in forest areas with untapped potential in wood production, due to small ownership and low involvement of owners in forest management Objectives of forest massif development plans : To improve wood production through higher mobilization To take into account other forest functions in land management Needs of information to elaborate those Massif plans What kind of satellite derived information? 21/05/2008 ORFEO GT 6 2/17 1

2 Forest features of interest Type of forest stands Forest stand Bio-physical variables Dendrometric variables (height, diameter ) Forest stand age Detection of forest activities : clear cuts, thinnings Monitoring Afforestation Reforestation Deforestation Infrastructures : road network 21/05/2008 ORFEO GT 6 3/17 Study site Quickbird French region of Limousin Study site Massif plans Municipal Forest State Forest 21/05/2008 ORFEO GT 6 4/17 2

3 EO Data available Quickbird 08/07/2006 Multispectral 2.8m Panchromatique 0.7m Quickbird 2008 planned Spot 5 29/09/2006 Multispectral 10m Panchromatique 5m Panchromatique 2.5m ORFEO ISIS Spot 5 29/08/2005 Multispectral 10m Panchromatique 5m Panchromatique 2.5m Landsat 5 TM 08/06/2004 and 30/08/ m Digital Orthophotoplans 2000 & 2005 BD ORTHO IGN Natural color 0.5 m GSE Forest Monitoring 21/05/2008 ORFEO GT 6 5/17 GIS Data available GIS data from CFBL forest cooperative (Coopérative Forestière Bourgogne Limousin) Forest stands : Tree species Plantation year Stands type Silvicultural regime Road network : Road Dirt road Skidder way Planned road 21/05/2008 ORFEO GT 6 6/17 3

4 GIS Data available GIS data from IFN Département Forest type maps: Composition Tree main species Forest structure MMU 2,25 ha scale 1/ to 1/ Version /05/2008 ORFEO GT 6 7/17 Illustration Forest species Near Infra Red : Discrimination Broad-leaved / Coniferous Radiometric differences between groups of coniferous species : Pines / Spruce / Douglas / larch Almost no radiometric differences between broadleaved species 21/05/2008 ORFEO GT 6 8/17 4

5 Illustration: Forest species Interest of Near Infrared to discriminate species Pine Spruce Broad-leaved Douglas fir Larch 21/05/2008 ORFEO GT 6 9/17 Illustration: Forest species Intra-species variability Douglas fir 20 years Douglas fir 40 years 21/05/2008 ORFEO GT 6 10/17 5

6 Illustration: Bio-physical variables Age classes : Radiometry Texture 5y 15y 30y 10y Clear cut 0y 20y age classes in Douglas fir stands 21/05/2008 ORFEO GT 6 11/17 Illustration: Bio-physical variables Interest of Panchro Very High Resolution : Young plantation 5-year old Multispectral 2.8m : pinkish radiometry + logging heaps > supposed plantation Panchromatic 0.7m : individual young trees > plantation is sure 21/05/2008 ORFEO GT 6 12/17 6

7 Illustration: forest activities Systematic thinning in a coniferous stand Orthophoto Quickbird /05/2008 ORFEO GT 6 13/17 Illustration: forest activities Selective thinning in a mixed stand Removal of a proportion of broad-leaved trees Orthophoto Quickbird /05/2008 ORFEO GT 6 14/17 7

8 Illustration: forest activities Selective thinning in a Broad-leaved stand Clear cut with seed trees in a broad-leaved stand Orthophoto Quickbird /05/2008 Orthophoto Quickbird ORFEO GT 6 15/17 Illustration: Land use change After storm Clear cut Replantation Recent clear cut < 5 years After storm Clear cut land use change Forest to agriculture 21/05/2008 ORFEO GT 6 16/17 8

9 Conclusions and next steps Large amount of data Forest data / GIS from users (forest cooperatives) Wide range of satellite data Collection of forest features of interest Comparison of Image data / forest data Qualitative analysis on going Quantitative Image analysis to be done Manual Photo-interpretation of the images Image segmentation and classification tools to be tested Multi-temporal analysis Interest to detect forest activities Interest to monitor post clear cut / thinning evolutions crown coverage evolution / land use and land use changes Summer 2007 image acquisition failed, summer 2008 image acquisition planned 21/05/2008 ORFEO GT 6 17/17 9