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

ALOS/ALOS-2 Contribution to GEOSS Masanobu Shimada GEOS-AP Tokyo 2014

Courtesy to Dr. Morishita

２０１４年５月２４日，１２時０５分 種子島宇宙センター

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

周波数と森林の見え方 波長 X band C-band L-band 短い 長い Rain SAR data of Rondonia (difference in frequency by SIR-C of 1994)

Launched on May 24, 2014 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 6

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

ALOS-2 Specifications . High ScanSAR ScanSAR Spotlight Ultra Fine Fine sensitive nominal wide Bandwidth 84MHz 84MHz 42MHz 28MHz 14MHz 28MHz 14MHz Rg × Az ： Resolution 3m 6m 10m 100m 60m 3 × 1m Rg × Az ： 350km 490km Swath 50km 50km 70km 25 × 25km (5-scan) (7-scan) Polarization SP SP/DP SP/DP/FP/CP SP/DP NESZ -24dB -24dB -28dB -26dB -26dB -23dB -23dB Rg 25dB 25dB 23dB 25dB 25dB 20dB S/A Az 20dB 25dB 20dB 23dB 20dB 20dB SP : HH or VV or HV , DP : HH+HV or VV+VH , FP : HH+HV+VH+VV , CP : Compact pol (Experimental mode) 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

Operation start Launch Distribution starts 2.5Mo 3.5Mo L+7 BOS-2 starts Before launch cal Cal Initial Cal Operation, Data Distribution, PI 画質の議論 Data release(limited for CVST-3/4 ） CVST1 CVST2 Nov. 2012 Nov. 2013 Antenna Pattern R-G CAL using CR JAXA PolCal over Amazon JAXA Review Data Take for PI CVST PI PI meeting (Sept. 2013) FTP distribution

The ALOS-2 Basic Observation Scenario (BOS) (as of February 2014)

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

Forest monitoring Temporal repeat: 6 cov/year GSD: 10 m (off-nadir 28.2 ° -36.2 ° ) Mode: Stripmap Dual-pol (HH+HV/28MHz) 12

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) 13

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 ） 1 st year 2 nd year 3 rd year Prio 1 Prio 2 * 3 years required for global coverage in 3m mode 14

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) 1 st year 2 nd year 3 rd year 5 th year 4 th year Areas observed every year 15 * 5 years required for global coverage in 6m QP mode

Observation pattern for annual acquisitions * Super sites （ TBD) 16 * 3m SP and 6m QP modes require 3 and 5 years for global coverage

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

ALOS PALSAR 50 m global mosaic data Open release 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 Product specifications and ancillary data

ALOS PALSAR 50 m global mosaic data Open release 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 http://www.eorc.jaxa.jp/ALOS/en/palsar_fnf/registration.htm

PALSAR 50 m global mosaic data

 Bulk download of data over 5°x 5° region (25 tiles 1°x1° each) OR  click on a tile on the grid to download the individual 1° tile

ALOS PALSAR 50 m global mosaic data Open release Backscatter (HH) Radar backscatter, normalised for incidence angle ( γ o = σ o /cos θ i ) Radiometric and geometric corr for topography GEOTIF header information 16 bits (UINT)

ALOS PALSAR 50 m global mosaic data Open release Backscatter (HV) Radar backscatter normalised for incidence angle ( γ o = σ o /cos θ i ) Radiometric and geometric corr for topography 16 bits (UINT)

ALOS PALSAR 50 m global mosaic data Open release Backscatter false-colour composite R: HH G: HV B: HH/HV

ALOS PALSAR 50 m global mosaic data Open release Observation date Data layer DN=975 showing the 25/09/2008 acquisition date for each pixel in the image: Date = 24/1/2006 + DN DN=917 DN=854 29/07/2008 27/05/2008 16 bits (UINT)

ALOS PALSAR 50 m global mosaic data Open release Incidence angle Layer with local incidence angle for each pixel 16 bits (UINT)

ALOS PALSAR 50 m global mosaic data Open release Mask data Layer showing ocean and no- data areas: layover, shadow. 8 bits

ALOS PALSAR 50 m global mosaic data Open release Forest/Non- Forest JAXA global classification (version 0) 8 bits

3.3 Accuracy Assessment (1/3) – PALSAR vs. FRA vs. Landsat x1000ha Region Landsat(2000) PALSAR(20 FRA(2005) Diff 07) 664834 635460 691369 -8.09 Africa 545418 580807 584049 -0.56 Asia 992909 945540 1009462 -6.33 Eurasia 778456 697116 705183 -1.14 N/C America 132427 187538 196745 -4.68 Oceania 951614 807790 874158 -7.59 S America 4065657 3854250 4060966 -5.09 Total FAO Hansen et al (2013), Science PALSAR 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.

ALOS PALSAR/PALSAR-2 global mosaic data Open release • 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.