Masato Hayashi Tadashi Imai - PDF document

1 Masato Hayashi, Tadashi Imai, Daisuke
Masato Hayashi, Tadashi Imai, Daisuke Sakaizawa,Jumpei Murooka , Rei Mitsuhashi , Toshiyoshi Kimura Japan Aerospace Exploration Agency (JAXA) Science Team meeting #25 Tokyo, Japan, February 5 - 8, 2019 Related mission updates: MOLI  Introduction  MOII’s feMture  Products of MOLI  Preliminary results

2 of airborne lidar experiment  Summa
of airborne lidar experiment  Summary  Introduction  MOII’s feMture  Products of MOLI  Preliminary results of airborne lidar experiment  Summary WOMt’s MOII? MOLI = forest  MOLI ( M ulti - footprint O bservation L idar and I mager) Items Specifications Mission instruments ◯ LIDAR Laser

3 wavelength/ 1064nm Number of beam /
wavelength/ 1064nm Number of beam / 2 beam (Split from one beam) Beam power/ 20mJ each Pulse width / less than 7ns Footprint rMdius / Φ25m ◯ Imager Band / Green; 550 - 630nm Red; 630 - 740nm NIR; 740 - 880nm Spatial resolution / 5m Swath / 1km Size 1605 × 640 × 830

4 [mm] Mass About 300 kg Power Le
[mm] Mass About 300 kg Power Less than 400W Operation Over 1year Operational orbit ISS orbit(Inclination : 51.6 deg) Non - synchronous at an altitude of 400km Observation Image Overview of MOLI LIDAR Telescope Imager Telescope  Introduction  MOII’s feMture  Products of MOLI  Preliminary results

5 of airborne lidar experiment  Summa
of airborne lidar experiment  Summary Estimate slope angle from altitude information of three footprints (observation points) Before ： Correction using DEM data. Expected effect by “Multi footprint” MOLI’s feature → Improvement of cMnopy OigO observMtion by “Multi footprint” flatland Canopy height = D

6 istance between Signal start and last pu
istance between Signal start and last pulse LIDAR Signal Estimated height True height LIDAR Signal Canopy height = Distance between Signal start and last pulse ― T erm for correcting error from slope slope Error due to slope Estimated height True height Two line laser 50m 50m  Introduction 

7 MOII’s feMture  Products of MOLI
MOII’s feMture  Products of MOLI  Preliminary results of airborne lidar experiment  Summary Product level Product category Products Remark L1 (Standard) Lidar footprint products Waveforms ( ≧ 500Msps) including geolocation data Footprint Position Accuracy ≦ 15m Imager product (1km swath)

8 Image （ Red, Green, geometri
Image （ Red, Green, geometrically corrected L2 (Standard) Lidar footprint products Canopy heights ± 3m(Canopy Height is under 15m) ± 20% (Canopy Height is over 15m) Forest biomass ± 25t/ha (Biomass density is under 100t/ha) ± 25% (Biomass density is over 100t/ha) ※ Multi - footprint is e

9 xpected to compensates each product up t
xpected to compensates each product up to 30 degrees of slope. Product level Product category Products Remark L3 (Research) Integrated products with Lidar and imager (1km swath) C anopy heights Target 【 C anopy heights 】 ± ~5m (Canopy Height is under 15m) ± ~40% (Canopy Heig

10 ht is over 15m) 【 Forest biomass ã
ht is over 15m) 【 Forest biomass 】 ± ~40t/ha (Biomass density is under 100t/ha) ± ~40% (Biomass density is over 100t/ha) Forest biomass L4 (Research) Wall - to - Wall map products ( Integrated with GCOM - C/SGLI Data ) Canopy height map Forest biomass map ※ Multi - footprint is expec

11 ted to compensates each product up to
ted to compensates each product up to 30 degrees of slope. Image of L1 product at GIS software (Using airborne lidar experiment at Ise forest)  Introduction  MOII’s feMture  Products of MOLI  Preliminary results of airborne lidar experiment  Summary Test configuration We installed a multi - foot print

12 lidar system on aircraft(King Air 200T
lidar system on aircraft(King Air 200T) with CCD camera (Canon EOS 5D Mark III). ①ｌ idar ② CCD camera ③ reflection mirror ④ window (AR Coating ) Overview of King Air 200T Lidar System(CAD model) Lidar System(picture) ① ① ② ② ③ ③ ④ ④ Preliminary results of airborne lidar experimen

13 t (2/5) Data processing LIDAR _wav
t (2/5) Data processing LIDAR _waveform Peak fitting Last pulse Signal Start POS_data Calculate distance between airborne LIDAR to ground Calculate footprint geolocation position Calculate RH100 Calculate footprint slope Estimated ground slope (Vertex normal method ) Ü¥�݊݌��&#x

14 D835DC52;��ℎݐ
D835DC52;��ℎݐ = ��100 − 0 . 382ܦ ∙ ݐ�݊ ݏ�݋݌� Correction by estimated slope D = Footprint diameter Preliminary results of airborne lidar experiment (3/5) Estimated slope angle Average slope angle from 25m DEM[deg] Estimated slope angle fro

15 m “Multi footprint” [deg] First,
m “Multi footprint” [deg] First, we compared estimated some footprint slope angle cMlculMted by “ Multi footprint ” witO DEM data. From this result, we confirmed that the Multi footprint method can estimate roughly ground slope. The DEM was resampled to 25 m square and calculated slope according to the footprint diameter o

16 f MOLI 33 ° 19'1.54"N 134 ° 7'
f MOLI 33 ° 19'1.54"N 134 ° 7'8.01"E #1_1 #1_2 #1_3 #1_4 #1_5 #1_6 #1_7 #2_1 #2_2 #2_3 #2_4 #2_5 #2_6 #2_7 Verification Site #1 Verification Site #2 Verification (Muroto forest) We validated the canopy height directly to verify the observation results at 3 sites. (Muroto, Gero) 0 5 10 15 20 2

17 5 30 #1_1 #1_2 #1_3 #1_4 #1_5 #1_6 #1_7
5 30 #1_1 #1_2 #1_3 #1_4 #1_5 #1_6 #1_7 0 5 10 15 20 25 30 #2_1 #2_2 #2_3 #2_4 #2_5 #2_6 #2_7 RH100 correction Maximum Canopy Height （ at Verification Site ） Error of before the correction ： 4.94[m] Error of after the correction ： 1.54[m] Error of before the correction ： 4.30[m] Error of after the correction ： 1.08[m]

18 Canopy Height[m] Footprint ID Ve
Canopy Height[m] Footprint ID Verification Site #1 Verification Site #2 Verification Site #1 Verification Site #2 Preliminary results of airborne lidar experiment (4/5) Verification (Gero forest) 0 2 4 6 8 10 12 14 16 #1 #2 #3 #4 #5 #6 #7 RH100 correction Error of before the correction ： 4.63[m] Error of after the correc

19 tion ： 1.18[m] 35 ° 49'51.78"N
tion ： 1.18[m] 35 ° 49'51.78"N 137 ° 17'8.08"E #1 #2 #3 #4 #5 #6 #7 Verification Site #3 Maximum Canopy Height （ at Verification Site ） Canopy Height[m] Footprint ID Verification Site #3 Verification Site #3 These results show validity of the observation method using Multi - footprint for t

20 he mission requirement in 3 verification
he mission requirement in 3 verification sites. Preliminary results of airborne lidar experiment (5/5)  Introduction  MOII’s feMture  Products of MOLI  System Design  Preliminary results of airborne lidar experiment  Summary Summary  MOLI Target launch : 2022~ (Now Phase A to B)  JAXA/EORC cMlled for M

21 OII’s reseMrcO proposMls. (EO -
OII’s reseMrcO proposMls. (EO - RA2) Future Work  Method of slope angle calculation will improve.  To evaluate the accuracy using Airborne Laser Scanning (ALS) data.  To trial Integrated products with large footprint airborne Lidar data and imager(CCD camera) data. Estimated ground slope result Improve the estimated

22 result?  MOLI Target launch : 2022~
result?  MOLI Target launch : 2022~ (Now Phase A to B)  JAXA/EORC cMlled for MOII’s reseMrcO proposMls. (EO - RA2) Future Work  Method of slope angle calculation will improve.  To evaluate the accuracy using Airborne Laser Scanning (ALS) data.  To trial Integrated products with large footprint airborne Lidar dat

23 a and imager(CCD camera) data. Summary
a and imager(CCD camera) data. Summary Prototype MOLI L3 product to airborne lidar experiment (Algorithm under development) Adjust to MOLI Imager resolution(5m) and Smoothing local contrast Raw CCD camera data Spatial resolution ~10cm Integrated products with Lidar and imager data (40m mesh, RH 100) Thank you so much for