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Vicky Wolf

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Acquisitions occur when data is received in real time by an international ground ... 46-days cycles on a bi-annual basis to enable interferometric applications. ... – PowerPoint PPT presentation

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Title: Vicky Wolf


1
PALSAR Access at ASF DAACProcedures and Tools
for Accessing and Using PALSAR Data from ASF
  • Vicky Wolf
  • ASF User Services

2
Outline
  • Data Acquisition
  • Data Search and Ordering
  • Subscription procedure
  • Tools Available from ASF

3
Acquisition vs Observation
  • Observations occur when data is collected using
    the recorder or transmitted to JAXA via the relay
    satellite
  • Acquisitions occur when data is received in real
    time by an international ground station such as
    the ASF STGS
  • PALSAR acquisitions occur in only ScanSAR mode or
    the Direct Downlink mode
  • Direct Downlink mode is similar to Fine
    Resolution single polarization mode but has a
    lower resolution (20m vs 10m)

4
Data Observation Strategy
  • Basic Observation Strategy for ALOS established
    by JAXA
  • Observations are balanced among the three sensors
    the satellite carries PRISM, AVNIR-2, and PALSAR
  • Data from all three sensors is available from the
    AADN, only PALSAR is available through the USGRC
  • The PALSAR observation strategy features routine
    observations using four pre-selected sensor modes
  • The PALSAR strategy is separated into one plan
    for ascending (evening) passes, and one for
    descending (morning) passes.
  • Most PALSAR observations are planned to be
    ascending to minimize conflicts with optical
    sensors, it is difficult to get descending PALSAR
    coverage with the fine beam modes

5
PALSAR SENSOR
6
JAXA PALSAR Strategy
  • The minimum requirement for any land area on
    Earth is to perform at least one single-pol and
    one dual-pol acquisition annually, and in
    addition, two dual-pol acquisitions during
    consecutive 46-days cycles on a bi-annual basis
    to enable interferometric applications. Most
    areas are however to be acquired significantly
    more often than this, typically 3-5 times per
    year.
  • In general, regions in the eastern hemisphere
    (Asia, Australia, eastern Europe and Africa)
    within the coverage of the Data Relay Satellite
    (DRTS) are acquired most frequently, while the
    western hemisphere (the Americas, western Europe
    and Africa) is restrained by the recording and
    down-link capacity of the on-board data recorder
    (HSSR).
  • Complete information on regions and modes for
    each cycle can be found at http//www.eorc.jaxa.jp
    /ALOS/obs/overview.htm.

7
PALSAR Systematic Observation Strategy-Overview
8
PALSAR for Cycle 20 June 9 to July 25, 2008
Fine Beam Dual-Pol ascending coverage of the blue
regions is the plan from the basic observation
strategy for Cycle 20 this summer
9
User Driven Observations
  • User driven requests have the highest success
    rate when in line with the strategy for a cycle
  • For example, it is difficult to successfully
    acquire quad-pol data during cycles that are
    focused on acquiring dual-pol data
  • ASF plans user requests two weeks in advance of
    the observation week
  • Requests are submitted to JAXA on a weekly basis
  • Requests are necessary for acquisitions (direct
    downlinks to ASF)

10
PALSAR Observation Scheduling Success
11
Data Search and Order
  • AADN Americas ALOS Data Node
  • Automatically receives all scenes acquired over
    North, South and Central America since ALOS went
    operational from JAXA and makes them visible
    through the AADN URSA
  • URSA User Remote Sensing Access interface
  • ASF search and order interface
  • Two versions exist, one for searching the DAAC
    catalog, the other for searching the AADN catalog
  • AUIG JAXAs interface for searching the catalog
    of all known ALOS observations
  • Out-of-zone Scenes that are acquired for any
    region of the world other than the Americas or
    prior to the operational phase of ALOS

12
PALSAR Scenes in the DAAC
  • Scenes in AADN archive are ordered for transfer
    to the DAAC when requested by approved users
  • Out-of-zone scenes are ordered for transcription
    from JAXA when requested by approved users
  • All PALSAR scenes in the DAAC archive can be seen
    and ordered by approved users
  • All PALSAR scenes that have been processed by the
    DAAC are available from the PALSAR datapool
  • Subscriptions can be established by approved
    users for transfer and processing by the DAAC

13
Searching for Data
  • The ASF URSA interface should be used to identify
    scenes for transfer from the AADN archive
  • The AUIG interface should be used to identify
    out-of-zone scenes for transcription and transfer
    to the DAAC
  • The DAAC URSA interface should be used for
    ordering scenes for processing

14
Out-of-Zone Data
  • Out-of-zone scenes are scenes that were acquired
    for areas outside of the Americas or prior to the
    operational phase of ALOS
  • Out-of-zone scenes are identified by searching
    the AUIG
  • To request an out-of-zone scene, a user needs to
    send ASF the scene id and date of observation
  • On average, there are 9 days between placing an
    out-of-zone order with JAXA and receiving the
    data for the AADN archive
  • When requesting out-of-zone data for DAAC
    projects, USO orders the scenes for transfer as
    soon as they appear in the AADN catalog

15
JAXA Archive
  • Global archive
  • Guest may search all PALSAR holdings
  • Commissioning phase data (May 15-Oct 22, 2006)
  • Scene ID and date required for OOZ order
  • https//auig.eoc.jaxa.jp/auigs/top/TOP1000Init.do

16
AADN Archive
  • https//ursa.aadn.alaska.edu/
  • Guests can search all PALSAR holdings in the AADN
    archive
  • Data over the Americas acquired since October 23,
    2006
  • Some global data
  • Scene IDs are required to designate data for
    transfer

17
Data Order
  • Data credits awarded by proposal approval are
    only valid for PALSAR data processing
  • Investigator logs into URSA DAAC and orders
    scenes for processing to desired parameters
  • Processed data is automatically entered into the
    USGRC PALSAR Data Pool in addition to being
    delivered to investigator

18
Interfaces
  • AADN URSA https//ursa.aadn.alaska.edu/cgi-bin/lo
    gin/guest/
  • DAAC URSA https//ursa.asfdaac.alaska.edu/cgi-bin
    /login/
  • AUIG https//auig.eoc.jaxa.jp/auigs/top/TOP1000In
    it.do

19
Order Processing
  • Users may order scenes for processing once they
    are transferred to DAAC
  • All PALSAR scenes processed by the DAAC are
    available through the PALSAR datapool

20
Subscription Procedure
  • User defines either the region or paths and
    frames that are desired
  • ASF searches for scenes that match at regular
    intervals and transfers them to the DAAC archive
  • ASF either notifies the user that the scenes are
    available to be ordered for processing, or orders
    the scenes for the user based on parameters such
    as processing level and delivery method that the
    user has predefined
  • Once processed, scenes are available to all
    approved users through the PALSAR data pool

21
ASF User Tools
  • USGS Webinar
  • 25 April 2008

22
MapReady
  • Freely available software (BSD license).
  • Developed with an intention to increase the
    usability of SAR data.
  • Intuitive user interface enables those with
    little or no SAR experience to readily process it
    for use with other data layers.

23
MapReady
  • Ingests ASF, CEOS, and GeoTIFF data formats.
  • Can export the data to JPEG, GeoTIFF, PNG, and
    some other formats.
  • Geocodes data to any of five popular map
    projections
  • UTM, Polar Stereographic, Lambert Azimuthal Equal
    Area, Lambert Conformal Conic, Albers Equal Area
  • Terrain corrects (orthorectifies) to remove
    artifacts commonly seen in SAR data such as
    layover and shadow.

24
MapReady
  • Includes support for multiband data such as
    polarimetric data.
  • Batch processing ability allows users to process
    large volumes of data at once.
  • Preview images are visible for each item in the
    batch list (input and output).
  • Includes a metadata viewing tool.
  • Input and output images can be viewed in full
    resolution with the integrated ASF View tool.
  • Image footprint can be viewed in Google Earth.

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28
MapReady
  • Goals for the near future
  • Support for Single Look Complex data.
  • Improved support for polarimetric data.
  • Ability to ingest and process AirSAR data.
  • Ability to ingest and process data written by the
    Gamma software.

29
Convert to Vector
  • This simple tool allows users to create a shape
    or kml file based on images that may not be
    viewable but have metadata.
  • The areas footprint can then be viewed using
    Google Earth or ArcMap.
  • Non-lat/lon metadata is passed along as
    attributes.
  • Windows release planned for May 1st.
  • Pending testing validation.

30
Convert to Vector
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32
ASF Forum
  • ASF hosts an online forum for users to ask
    questions of our technical staff and user
    community.
  • Over 165 members
  • Nearly 600 total posts and growing
  • https//forum.asf.alaska.edu

33
uso_at_asf.alaska.edu 907-474-6661
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