ALOS/ALOS-2 Contribution to GEOSS Masanobu Shimada GEOS-AP Tokyo - - PowerPoint PPT Presentation

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ALOS/ALOS-2 Contribution to GEOSS Masanobu Shimada GEOS-AP Tokyo - - PowerPoint PPT Presentation

Dec 07, 2022 41 likes •408 views

ALOS/ALOS-2 Contribution to GEOSS Masanobu Shimada GEOS-AP Tokyo 2014 Courtesy to Dr. Morishita JERS-1/SAR (1992-1998) ALOS/PALSAR(2006-2011) L-band SAR

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GEOS-AP Tokyo 2014

ALOS/ALOS-2 Contribution to GEOSS

Masanobu Shimada

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Courtesy to Dr. Morishita

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２０１４年５月２４日，１２時０５分 種子島宇宙センター

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JERS-1/SAR (1992-1998) ALOS/PALSAR(2006-2011) ALOS-2(JFY2013~) Pi-SAR-L(1998~2011) Pi-SAR-L2(2012~) 4

L-band SAR

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SAR data of Rondonia (difference in frequency by SIR-C of 1994)

長い 短い Rain

X band C-band L-band 波長

周波数と森林の見え方

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Improvement from ALOS to ALOS-2

  • Higher Resolution
  • More Polarizations (Polarimetry)
  • Lower NESZ
  • Wider Observable range for Quicker Service
  • Orbital Maintenance for InSAR (ScanInSAR)
  • Duty : 50%>Systematic Forest observation

Launched on May 24, 2014

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The overview of ALOS-2

7 ALOS-2 satellite parameters Orbit type : Sun-synchronous Launch : 2013 Altitude : 628km +/- 500m(for reference orbit) Revisit time : 14days LSDN : 12:00 +/- 15min PALSAR-2 (Mission Sensor) L-band Synthetic Aperture Radar Active Phased Array Antenna type two dimensions scan (range and azimuth) Antenna size : 3m(El) x 10m(Az) Bandwidth : 14 to 84MHz Peak transmit Power : 5100W Observation swath : 25km to 490km Resolution : Range 3m to 100m Azimuth 1m to 100m SAR antenna

X Y Z

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ALOS-2 Specifications .

Spotlight Ultra Fine High sensitive Fine ScanSAR nominal ScanSAR wide Bandwidth 84MHz 84MHz 42MHz 28MHz 14MHz 28MHz 14MHz Resolution Rg×Az： 3×1m 3m 6m 10m 100m 60m Swath Rg×Az： 25×25km 50km 50km 70km 350km (5-scan) 490km (7-scan) Polarization SP SP/DP SP/DP/FP/CP SP/DP NESZ

  • 24dB
  • 24dB
  • 28dB
  • 26dB
  • 26dB
  • 23dB
  • 23dB

S/A Rg 25dB 25dB 23dB 25dB 25dB 20dB Az 20dB 25dB 20dB 23dB 20dB 20dB

Main applications: Fine beam (DP): Forest and land cover monitoring ScanSAR (DP): Rapid deforestation / wetlands / InSAR (ScanSAR-ScanSAR) Spotlight (SP): Emergency observations Ultra Fine (SP) : Global map, InSAR base mapping High sensitive (QP): Global map ScanSAR wide (SP) : Polar ice

SP : HH or VV or HV , DP : HH+HV or VV+VH , FP : HH+HV+VH+VV , CP : Compact pol (Experimental mode)

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2.5Mo 3.5Mo Launch L+7 Operation start Distribution starts

Data release(limited for CVST-3/4）

CVST1

  • Nov. 2012

CVST2

  • Nov. 2013

PI meeting (Sept. 2013)

Antenna Pattern R-G CAL using CR PolCal over Amazon Data Take for PI FTP distribution JAXA Review

JAXA CVST PI BOS-2 starts

Operation, Data Distribution, PI

Cal Before launch cal

Initial Cal

画質の議論

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The ALOS-2 Basic Observation Scenario (BOS)

(as of February 2014)

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Global land areas – baseline mapping

Temporal repeat: 2 cov/year GSD: 10 m (off-nadir 28.2°-36.2°) Mode: Stripmap Dual-pol (HH+HV/28MHz)

Prio 1 Prio 2

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Forest monitoring Temporal repeat: 6 cov/year GSD: 10 m (off-nadir 28.2°-36.2°) Mode: Stripmap Dual-pol (HH+HV/28MHz)

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Wetlands & Rapid deforestation monitoring Temporal repeat: 9 cov/year GSD: 100 m (off-nadir 26.2°-41.8°) Mode: ScanSAR 350km Dual-pol (HH+HV/14MHz)

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Global land areas – VHR baseline mapping

Temporal repeat: 1 cov/ 3 years GSD: 3 m (off-nadir 29.1°-38.2°) Mode: Stripmap Single-pol （HH/84MHz）

Prio 1 Prio 2

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* 3 years required for global coverage in 3m mode 1st year 2nd year 3rd year

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Global land areas – Quad-polarimetric baseline

Temporal repeat: 1 cov/ 5 years GSD: 6 m (off-nadir 25.0°-34.9°) Mode: Stripmap Quad-pol (HH+HV+VV+VH)

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* 5 years required for global coverage in 6m QP mode

Areas observed every year 1st year 2nd year 3rd year 4th year 5th year

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* 3m SP and 6m QP modes require 3 and 5 years for global coverage

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Super sites （TBD)

Observation pattern for annual acquisitions*

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ALOS PALSAR 50 m global mosaic data Open release

Ortho rectification > GIS Global coverage Slope correction Higher Tim series dataset available All weather observation Free distribution over 25 m resolution

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As of January 16, 2014, JAXA have made PALSAR 50 m global mosaic data openly available free of charge. Annual mosaics from 2007, 2008, 2009 and 2010, covering all land areas except Greenland and Antarctica. Generation will continue from 2014 with ALOS-2 The 50m mosaic data were generated by averaging from JAXAs 25m resolution mosaic products. Available in 1°x1° tiles. The data can be downloaded from

http://www.eorc.jaxa.jp/ALOS/en/palsar_fnf/fnf_index.htm

ALOS PALSAR 50 m global mosaic data Open release

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Product specifications and ancillary data

ALOS PALSAR 50 m global mosaic data Open release

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In addition, JAXA are making available also their global forest/non-forest (FNF) classification "version 1" from 2007 – 2010. 50m pixel spacing, generated from 25m products. JAXA have evaluated the classification maps using three different data sets (GE, DCP and FRA), and obtained 90%, 87% and 95% correspondence.

ALOS PALSAR 50 m global mosaic data Open release

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http://www.eorc.jaxa.jp/ALOS/en/palsar_fnf/registration.htm

ALOS PALSAR 50 m global mosaic data Open release

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PALSAR 50 m global mosaic data

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 Bulk download of data

  • ver 5°x 5° region

(25 tiles 1°x1° each) OR  click on a tile on the grid to download the individual 1° tile

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Backscatter (HH) Radar backscatter, normalised for incidence angle ( γo = σo/cosθi ) Radiometric and geometric corr for topography GEOTIF header information 16 bits (UINT)

ALOS PALSAR 50 m global mosaic data Open release

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Backscatter (HV) Radar backscatter normalised for incidence angle ( γo = σo/cosθi ) Radiometric and geometric corr for topography 16 bits (UINT)

ALOS PALSAR 50 m global mosaic data Open release

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Backscatter false-colour composite R: HH G: HV B: HH/HV

ALOS PALSAR 50 m global mosaic data Open release

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Observation date Data layer showing the acquisition date for each pixel in the image:

Date = 24/1/2006 + DN

16 bits (UINT)

DN=917 29/07/2008 DN=854 27/05/2008 DN=975 25/09/2008

ALOS PALSAR 50 m global mosaic data Open release

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Incidence angle Layer with local incidence angle for each pixel 16 bits (UINT)

ALOS PALSAR 50 m global mosaic data Open release

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Mask data Layer showing

  • cean and no-

data areas: layover, shadow. 8 bits

ALOS PALSAR 50 m global mosaic data Open release

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Forest/Non- Forest JAXA global classification (version 0) 8 bits

ALOS PALSAR 50 m global mosaic data Open release

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3.3 Accuracy Assessment (1/3) – PALSAR vs. FRA vs. Landsat

Region Landsat(2000) PALSAR(20 07) FRA(2005) Diff Africa 664834 635460 691369

  • 8.09

Asia 545418 580807 584049

  • 0.56

Eurasia 992909 945540 1009462

  • 6.33

N/C America 778456 697116 705183

  • 1.14

Oceania 132427 187538 196745

  • 4.68

S America 951614 807790 874158

  • 7.59

Total 4065657 3854250 4060966

  • 5.09

x1000ha Hansen et al (2013), Science PALSAR FAO

Masanobu Shimada, Takuya Itoh, Takeshi Motooka, Manabu Watanabe, Rajesh Thapa, and Richard Lucas, “New Global Forest/Non-forest Maps from ALOS PALSAR Data (2007-2010),” Remote Sensing Environment, accepted April 4, 2014, published.

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  • Open release of 25 m versions

foreseen for mid 2014 Same production chain availabe for ALOS-2 PALSAR/PALSAR-2 training course for forest classification was palanned 3 times in Japan. ALOS PALSAR/PALSAR-2 global mosaic data Open release