Optical calibration, bathymetry, water column correction and bottom typing of shallow marine areas, using passive remote sensing imageries
busy? see 4SM slides
The 4SM workstation
Your comments are invited                            See you on 4SM blog

intel_x86-64    Core i7    
Windows 10
Image result  

For workstation installation, refer to tarawa tutorial

I entirely depend on FWTool/OpenEV. 
FWTools is an age-old 32 bits executable RG/GIS image viewer.
It still runs on 32 bits Linux.
  • My workstation: from 1999 to 2014: I used Toshiba Satellite laptops.
    • then I moved to MSI GS70 64 bits Intel x86_64 laptop: Intel Core I7 2.13 GHz, 16 GB RAM, 17" screen 1920*1080 (16:9, full HD).
    • In march 2018, I moved to a ASUS ROG STRIX 17" laptop.
  • My operating system: Windows 10/Oracle VM virtual box, 32 bits Ubuntu 16_LTS 32 bits/Gnome/bash.
  • 4SM code is proprietary ; it is written and compiled C.
  • 4SM system calls: 4SM calls some executables or Linux commands
    • GMT: gmtset , psbasemap, pstext , psxy, and psscale: 4SM writes some scripts which call a few modules of GMT from U. of Hawaii (please note that GMT may be installed using Ubuntu's Synaptic Package Manager). These executables are included in the 4sm.calls.zip zipfile
    • shp2text: using this executable, 4SM converts shapefiles to textfile SHP.txt, for use with the
    • wget, gv and cpuid: install them using Ubuntu Software Center
      • gv: default PostScript viewer in 4SM. If you use another viewer, you have to place a -Calls/epsviewer_yourviewer argument in your commandline
    • firefox: default browser in 4SM. If you use another browser, you have to place a 
    • gedit: default text editor in 4SM. If you use another texteditor, you have to place a 
    • chmod, rm, mkdir, dir, cp, zip, bzip2, whoami come with the Linux distribution
    • cpuid: if you want to become a superuser of 4SM
    • wget: if you want to download/update a mirror copy of 4SM website on your computer/network
  • Compiler: 4SM is compiled under Linux/Gnome/bash: " gcc -lm -w -m32 -g 4SM.c -lm -o 4SM"
  • Image format: image.pix from PCIgeomatica, band-interleaved, preferably file-interleaved.
  • Image preparation and display:
    • I formerly used ImageWorks and EASI/PACE from PCI .
    • Since 2005, I only use OpenEV FWTools for import/export, image display and vector activities.
  • GUI: I would like to develop a GUI with Qt Designer or GLADE in order to manage the 4SM command line.
  • This full HD screen display shows
    • under Oracle VM Virtual Box running Ubuntu 32 bits
    • my XTERM terminal as a backdrop
    • the tarawa-subset tutorial command line script,
    • the OPENEV display of the tarawa-full.pix image, complete with georeferencing
    • Google web browser under Windows 10
  • This demonstrates that the OPENEV solution still has a future,
    • and it costs nothing!

please compile and run 4SM 
  under Ubuntu 16 LTS 32 bits 
  gcc -lm -w      -m32 -g 4SM.8.07.c -lm -o 4SM.8.07
Write 4SM in python?
  • "system programming languages (like C) are well suited to building components where the complexity is in the data structures and algorithms"
  • "scripting languages (like python) are well suited for gluing applications where the complexity is in the connections"
    • "my conclusion: keep 4SM in C, which is "a system programming language"
  • please read http://webcem01.cem.itesm.mx:8005/s201513/tc2026/scripting_xxi.pdf
    • Does the application implement complex algorithms or data structures?
      • I think probably YES
      • "stratified" waters over the visible range makes for a fairly complex description of diffuse attenuation properties
      • 4SM makes good use of dynamic memory allocation, and of structure data type
    • Does the application manipulate large datasets (e.g. all the pixels in an image) so that execution speed is critical?
    • Are the application's functions well-defined and changing slowly?
      • I think YES: took me 23 years!!
    • Is the application's main task to connect together pre-existing components?
      • I think NO, certainly NOT the main task
      • system calls to pre-existing gv, shp2text, or OpenEV are very simple and effective in C
    • Will the application manipulate a variety of different kinds of things?
      • I think NO
    • Does the application include a graphical user interface?
      • NO: entirely controlled by a powerfull and well structured command line
      • GUI not needed actually;
      • although much desired/demanded by lazy would-be practitioners: can wait!
    • Does the application do a lot of string manipulation?
      • NO, just a few for building output file names, and for deciphering command line
    • Will the application's functions evolve rapidly over time?
      • I think NO
      • after 23 years, all main features have been identified and implemented
      • catters for multi/hyperspectral imageries
      • catters for various pixel sizes
      • catters for very large images
    • Does the application need to be extensible?
      • I think NO, for the years to come
      • already does a lot
      • covers all image formats and ground sample distances
      • does both the optical calibration and the raster processing
      • does the deglinting, pan sharpening, smart smoothing, model inversion, and bottom typing
      • runs and displays spatial and spectral profiles



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