ROI_PAC processing for Modern Geodetic Methods (Page 3 of 6)

Table of Contents

Data Source:

We will/have downloaded the data from the WInSAR Consortium archive for a pair of repeat orbit images surrounding the October 16, 1999 Hector Mine Earthquake in Southern California.


• Within the search archive window of the WInSAR website, I chose to search radially for 100 km about 34.7 and -116.2 degrees (approx epicenter of the earthquake), and between September 1 through October 31, 1999.
• 37 results were found, all for the ERS-2 satellite. We chose to download data from Track 127 and Frame 2907.
• We need the following directory structure for the raw data: 'working_dir'/T'track'_'frame'/'sat'_'orbit'

   where:
             track = 127
             frame = 2907
             sat   = E2   #(ERS2)
             orbit = 23027  # or 23528  
  

  • Track numbers correspond to number of the "along-track" path that the satellite is traveling (for ERS satellites this varies mostly from East-West).
  • Frame numbers correspond to individual slices "along-track" and vary from N-S for descending and S-N for ascending orbits.
  • For repeat passes the Track and Frame numbers remain constant for the same satellite, while the orbit number will continue to increase.
  
  

    % mkdir -p  ~/MGM/HectorMine/T127_2907/E2_23027
    % mkdir -p  ~/MGM/HectorMine/T127_2907/E2_23528 

• Because the password is protected, we will supply you with the already downloaded data. Please do not ask Jay or me for the password! We cannot give it to you.
• For class, we will create links for the zip directories, since they are ~170M each.

    % cd  ~/MGM/HectorMine/T127_2907/E2_23027
    % ln -s ~anewman/MGM/HectorMine/ZIP/ERS2_127_2907_23027.zip
    
    % cd  ../E2_23528
    % ln -s ~anewman/MGM/HectorMine/ZIP/ERS2_127_2907_23528.zip
  

• If you had the password you could get the data. If you are working on a remote terminal, it may be a much better idea to download the data remotely using ftp from the command line.

    % cd  ~/MGM/HectorMine/T127_2907/E2_23027
    # The below will prompt you for the WInSAR password at UCSD (WE WON'T DO THIS IN CLASS) 
    %         ftp ftp://ers@winsar.ucsd.edu/T127/2907/e2_23027_2907.raw.gz  
    %         ftp ftp://ers@winsar.ucsd.edu/T127/2907/e2_23027_2907.ldr
    %         ftp ftp://ers@winsar.ucsd.edu/T127/2907/e2_23027_2907.vdf
    # or 
    %         wget  http://winsar.stanford.edu/data/ERS2/127/2907/ERS2_127_2907_23027.zip
  
    % cd  ../E2_23528
    # The below will prompt you for the WInSAR password at UCSD (WE WON'T DO THIS IN CLASS) 
    %         ftp ftp://ers@winsar.ucsd.edu/T127/2907/e2_23528_2907.raw.gz  
    %         ftp ftp://ers@winsar.ucsd.edu/T127/2907/e2_23528_2907.ldr
    %         ftp ftp://ers@winsar.ucsd.edu/T127/2907/e2_23528_2907.vdf
    # or 
    %         wget  http://winsar.stanford.edu/data/ERS2/127/2907/ERS2_127_2907_23528.zip
    # instead we will link the files from my directory