IDL Programming in the ENVI Environment

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IDL Programming in the ENVI Environment

• Zentrum für Fernerkundung der Landoberfläche
• Summer Semester 2004
• Dr. M. Canty
• Forschungszentrum Jülich
• m.canty_at_fz-juelich.de

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Course content

• IDL basics syntax, variables, data types,
  operators, arrays, indexing, stuctures and
  pointers
• Programming basics procedures and functions,
  parameters and keywords, control structures,
  compilation and debugging
• Communicating with ENVI image formats, headers,
  reading and writing ENVI standard files, using
  ENVI batch routines, the ENVI menu, user
  functions
• Widgets and objects simple ENVI widgets,
  fundamentals of IDL widget progamming,
  object-oriented programming, tiling
• Extending ENVI Statistical Change Detection,
  Fuzzy Clustering, Image fusion, ...

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Books The ENVI Programmers Guide, Research
Systems Inc. 2000 (Part of the online help
system)   IDL Programming Techniques (2nd
Edition) David W. Fanning, Fanning Software
Consulting 2000 ISBN 0-9662383-2-X   Praxisbezogen
e IDL Programmierung M.Busch, R. Bauer, H. Heer,
M. Wagener, Informationstechnik, Forshungszentrum
Jülich 2002 ISBN 3-89336-308-4   Practical IDL
Programming L. E. Gumley (2nd Ed.) Morgan
Kaufmann 2003 ISBN 1558607005
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Internet IDL www.dfanning.com
cimss.ssec.wisc.edu/gumley/index.html
comp.lang.idl-pvwave Theoretical Background
m.canty.bei.t-online.de/zfl.html
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• Rules for automatic compilation
• The modules in a program file will be compiled
  until a main
• level program is encountered. It is compiled and
  run.
• The modules will be compiled until a module is
  encountered
• with the same name as the file. That module is
  compiled and run.
• The modules will be compiled until the end of the
  file is
• reached or until rule 1 or 2 applies.

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SUSAN Edge Detector (Smallest Univalue Segment
Assimilating Nucleus)
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RGB HSV Color Spaces
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Solar illumination geometry
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Change_thresh GUI
tlb
menubarID
textID
slider_topID
drawID
/column
fileID
slider_mID
slider_pID
refreshID
/row
loadID
saveID
quitID
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Principles of OOP - encapsulation an
object class is an IDL named data structure with
associated methods (procedures and
functions) - inheritance the ability
of an object class to inherit the behavior
of other object classes. - polymorphy
the ability to create multiple object types
that support the same operations.
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