Forest Height Estimation with X- Band InSAR: Phase Centre Location - - PowerPoint PPT Presentation

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Forest Height Estimation with X- Band InSAR: Phase Centre Location - - PowerPoint PPT Presentation

Nov 29, 2022 17 likes •211 views

Forest Height Estimation with X- Band InSAR: Phase Centre Location versus RVoG Florian Kugler, Irena Hajnsek, Seung-Kuk Lee & Konstantinos Papathanassiou German Aerospace Center (DLR) Microwaves and Radar Institute (HR) Lineout Test

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Forest Height Estimation with X- Band InSAR: Phase Centre Location versus RVoG

Florian Kugler, Irena Hajnsek, Seung-Kuk Lee & Konstantinos Papathanassiou German Aerospace Center (DLR) Microwaves and Radar Institute (HR)

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Lineout

Test Sites:

FinSAR Campaign INDREX II: Mawas Kobernausser Wald TempoSAR Campaign: Traunstein Biosar II Campaign: Krycklan

Issues:

Phase Centre Height Forest Height Extinction Comparision/Combination of different baselines

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Height Validation X band vs L band boreal forest Southern Finnland

X band validated against Scatterometer

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  • InSAR Research Group

InSAR Research Group

  • Peat swamp forest
  • Forest Height: 15m – 25m
  • Biomass around 100-

350t/ha

  • Uniform structure
  • Open canopy
  • Flat Topography

INDREX-II: Mawas Test Site

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Mawas X band Validation with Lidar

Lidar Strip was divided into 100 equal samples Phase Center Height Inversion I using φ0 from unvegetated area Inversion II using σ 0.3 d B/m

(mean Extinction Inversion I)

Lidar Strip Reference Height: Top Canopy height 100 (100 tallest tree per hectar)

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Test Site Kobernausser Wald

Kobernausser Wald:

  • Upper Austria
  • Temperate managed forest
  • Hilly Topography
  • Inhomogenous Composition
  • Stands of different Heights

from 4 to 35m and different age and different biomass

  • Domintated by Coniferous trees
  • Canopy mainly closed
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  • InSAR Research Group

InSAR Research Group

Kobernausser Wald Dataset

X Band Polarisation VV Single Pass Baseline :0.8m Lidar Strip InSAR Coherence Amplitude Image

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Kobernausser Wald X band Validation with Lidar

Phase Center Lidar h100 Inversion Heights Inversion Heights Phase Center Reference Height: Top Canopy height h100 (100 tallest tree per hectar)

Inversion I using φ0 from Lidar

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  • InSAR Research Group

InSAR Research Group

Kobernausser Wald X band Extinction Estimation

Extinction from height estimation Extinction from Lidar Inversion

2dB/m 1dB/m 0dB/m Stand: Mean Extinction from Inversion: 0.79dB/m Mean Extinction from Lidar h100: 0.82dB/m Mean Ground to Volume Ratio: 0.05 Mean forest Height, 25.7m

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Traunstein Test Site

Forest type Temperate Topography Moderate slopes 25 ~ 35m

  • N. Spruce, E. Beech, White Fir

40 ~ 450 t/ha Height Species Biomass

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InSAR Research Group

Temposar data

Full Baseline Half Baseline Coherence 0 to 1 Coherence 0 to 1 Phase -π to π Phase -π to π

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  • InSAR Research Group

InSAR Research Group

Estimated Forest Heights Full Baseline

Inversion height Scattering Centre 40m 20m 0m

Inversion using external ground phase Tends to underestimate high forests Scattering Centre clearly below estimated forest height

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Estimated Forest Heights Half Baseline

40m 20m 0m Inversion height Scattering Centre

Inversion using external ground phase Tends to underestimate high forests Scattering Centre clearly below estimated forest height Good Inversion Performance in near range

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InSAR Research Group

Estimated Extinction

Full Baseline Half Baseline Estimated with Reference Height Estimated with Reference Height Estimated from Height Inversion Estimated from Height Inversion

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InSAR Research Group

Lidar Tree Vegetation height

40m 20m 0m

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Biosar II Test Site Krycklan Sweden

Krycklan forest: Location:

  • middle Sweden
  • boreal forest
  • high topography

Composition

  • stands of different Height
  • maximum forest height: ~ 30m
  • mean forest height: 17m
  • stands of different age and

different biomass

  • domintated by Coniferous

trees

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Biosar data

Full Baseline Half Baseline Coherence 0 to 1 Coherence 0 to 1 Phase -π to π Phase -π to π

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Biosar dual Baseline Inversion results

Extinction Forest Height

2dB/m 1dB/m 0dB/m 40m 20m 0m

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Microwaves and Radar Institute / Microwaves and Radar Institute / Pol Pol -

  • InSAR Research Group

InSAR Research Group

Summary Forest Height Inversion using X-Band

Forest height estimation using X band provides prommissing results for tropical as well as for temperate & boreal forest conditiions X band Phase Center is significantly lower than Pol-InSAR forest height Especially in less dense forest conditions as can be found in boreal forests X band could provide good results Limitting factor for X band is forest density If there is an external DEM available we can go even further The results show a high potential of TanDEMX for forest height estimation in certain ecosystems, even if Quad or Dual Pol data are available