IDRISI-L Frequently Asked Questions (FAQ) List (Version 1.5)

 1. What is IDRISI?
 2. What does IDRISI stand for?
 3. How can I get a copy of IDRISI?
 4. What is IDRISI-L?
 5. How can I subscribe/unsubscribe to IDRISI-L?
 6. Where is the IDRISI-L FTP site and how can  I  access  this  re-
    source?
 7. What programs and data are located on the IDRISI-L FTP site?
 8. What do I need to do to donate a  module  to  the  IDRISI-L  FTP
    site?
 9. What graphics cards work with the new SVGA COLOR modules in Ver-
    sion 4.1?
10. Are there any useful tips or tricks for Version 4.1 that I  have
    been identified by IDRISI users?
11. What other programs are available for use with IDRISI?
12. Where can I find data sets for use with IDRISI?
13. How can I access an archive of IDRISI-L postings?
14. Where can I receive training on IDRISI?


 1. What is IDRISI?

    IDRISI is a raster geographic analysis software package develop-
    ed, distributed and supported by The IDRISI Project, a non-prof-
    it organization within  the  Graduate  School  of  Geography  at
    Clark University in Worcester,  Massachusetts.  To  date,  there
    are  over   11,000  registered  users  of  IDRISI  in  over  100
    countries, making it the most widely  used  raster  GIS  in  the
    world.  IDRISI is designed to be affordable and easy to use, yet
    provide professional-level analytical capability on DOS PC plat-
    forms.

    IDRISI provides an extensive suite of tools for  image  process-
    ing, geographic and statistical analysis, spatial decision  sup-
    port, time series analysis, data display, and import/export  and
    conversion.  In addition, as a set of independent  program  mod-
    ules linked to a broad set of simple data structures, the system
    is designed such that researchers may readily integrate into the
    system their own modules, written in any programming language.

 2. What does IDRISI stand for?

    IDRISI is not an acronym!  Idrisi was a  cartographer  and  geo-
    grapher of major significance during  the  medieval  period.  He
    was born in 1099 AD in Sebtah (now  the  Spanish  possession  of
    Ceuta) on the North  African  coast  of  what  is  now  Morocco.
    Commissioned by King Roger of Sicily  to  prepare  a  geographic
    survey of the world, Idrisi headed  a  collaborative  effort  by
    scholars and technicians  of  the  Rogerian  Court  at  Palermo.
    Based on direct field studies as well as archival  sources,  the
    maps and text that resulted from that  collaboration  served  as
    primary references for over 500 years.  It is to this spirit  of
    collaboration in geographic inquiry that the IDRISI  Project  is
    dedicated.

 3. How Can I Get a Copy of IDRISI?

    The IDRISI software package is distributed solely by the  IDRISI
    Project.  To obtain information or to place  an  order,  contact
    the Project at:

    The IDRISI Project
    The Clark Labs for Cartographic Technology &
    Geographic Analysis
    Clark University
    950 Main Street
    Worcester, MA 01610-1477 USA
    (508) 793-7526
    (508) 793-8842 (FAX)
    IDRISI@CLARKU.BITNET
    IDRISI@VAX.CLARKU.EDU

    Prepayment is required.  Returns are not accepted.

    The IDRISI Project office hours are from 09:00 to 17:00 hours US
    Eastern Standard Time Monday through Friday.  The telephone num-
    ber for technical support is (508) 793-7348 or (503) 793-7528.

 4. What is IDRISI-L?

    IDRISI-L is an Internet and Bitnet discussion group for users of
    the IDRISI software package developed by the Graduate School  of
    Geography at Clark University.  The purposes of IDRISI-L are: 1)
    to foster communication among the community of IDRISI users;  2)
    to encourage the application of IDRISI to real  world  problems;
    and 3) to provide user feedback regarding IDRISI to the Graduate
    School of Geography at Clark University.  IDRISI-L is  supported
    by the Department of Geography  and  Environmental  Planning  at
    Towson State University.  The "manager" of the discussion group,
    Dr. John M. Morgan, III ("Jay"), can be reached at:

       Department of Geography and Environmental Planning
       Towson State University
       Baltimore, Maryland 21204-7097
       (410) 830-2964
       (410) 830-3888 (FAX)
       E7G4MOR@TOE.TOWSON.EDU

    IDRISI-L is operated independently of  the  Graduate  School  of
    Geography at Clark University.  That is, Towson State University
    has no formal or informal relationship with the  IDRISI  Project
    regarding the IDRISI software package.  By supporting  IDRISI-L,
    Towson State University is not endorsing the use of  the  IDRISI
    software package, per se, but rather is interested in  fostering
    communication among academic, government, and  commercial  users
    of the software package.

 5. How can I subscribe/unsubscribe to IDRISI-L?

    IDRISI-L is operating on Towson State University's VAX  cluster.
    The discussion group is supported  by  MAILSERV  as  opposed  to
    LISTSERV software.  To subscribe to IDRISI-L  send  a  one  line
    message (SUBSCRIBE IDRISI-L) to either the Internet address:

       MAILSERV@TOE.TOWSON.EDU

    or the Bitnet address:

       MAILSERV@TOWSONVX

    To unsubscribe to IDRISI-L, send a one line message (UNSUBSCRIBE
    IDRISI-L) to either the Internet or Bitnet MAILSERV address.

 6. Where is the IDRISI-L FTP site and how can  I  access  this  re-
    source?

    The IDRISI-L FTP site is operating on a MicroVAX that is part of
    of Towson State University's  VAX  cluster.  The  anonymous  FTP
    site is located at:

       MIDGET.TOWSON.EDU

    or

       131.118.70.11

    After connecting to the FTP site, use ANONYMOUS as your  account
    number and your Internet or Bitnet  address  as  your  password.
    All modules, data sets, and other IDRISI information is  located
    in the  IDRISI  directory.  It  is  recommend  that  you  binary
    transfer all modules; data sets and the FAQ list may  be  trans-
    ferred as ASCII files.

 7. What programs and data are located on the IDRISI-L FTP site?

    IDRISI users have donated several "modules"

    a. Modules

        1) ASSIGNV - assigns values to  vector  identifiers  from  a
           values file.  ASSIGNV parallels the  functioning  of  the
           ASSIGN module, but works on  vector  rather  than  raster
           data in the TOSCA module.  Vector identifiers are changed
           to the corresponding values, and a new  file  is  written
           (the new file is identical  to  the  original;  only  the
           identifiers are changed).  The user is given  the  option
           to keep or discard vectors to which no values are assign-
           ed.  Donated by Jeff Jones, Clark University.

        2) AUTOLEG - creates a legend for IDRISI images for  display
           with autoscaling  (COLOR A).  Donated  by  Rusty  Dodson,
           NCGIA.

        3) BUFFER  - allows for buffers with direction to be applied
           to byte valued binary images.  Handles  pixels  that  are
           not square.  The operator can specify the value identify-
           ing the cell to be buffered (called the "source  value"),
           what cell is allowed to be written over (called the "tar-
           get value"), and what value to write in those cells  that
           fall within the buffer distance and direction (called the
           "buffer value").  Donated by Simon Greener, University of
           Tasmania.

        4) ENVIRON  - an  improved  version  of  IDRISI's   standard
           ENVIRON program.  Uses "rolling menus" from  which  input
           can be selected for particular  fields  (e.g.,  available
           drives, screen colors,  etc.).  Compatible  with  Version
           4.1 (detected from IDRISI.ENV  being  used).  Donated  by
           Simon Greener, University of Tasmania.

        5) EPPL2IDR - converts EPPL7 images to IDRISI format.  Dona-
           ted by Simon Greener, University of Tasmania.

        6) EXPTOVEC - a very powerful module to import ARC/INFO  ex-
           port into IDRISI vector format. It is possible to  import
           topology using this module.  Donated  by  Horst  Duester,
           University of Bern.

        7) GREENER  - self-extracting (PKSFX) files  of  the  Pascal
           source code for BUFFER, EPPL2IDR, and several other util-
           ities.  Donated by Simon Greener, University of Tasmania.

        8) ISLAND   - cleans IDRISI vector  polygon  files  imported
           with DLGIDRIS, IDR2DXF, IDR2ATL, and EXPTOVEC, or created
           with COLOR.  Donated  by  Horst  Duester,  University  of
           Bern.

        9) MOSSID   - converts MOSS data to IDRISI  format.  Donated
           by the IDRISI project.

       10) MSPTOIDR.UCM - creates an ASCII file of MicroStation line
           element coordinates (lines = 2 vectors; points =  1  vec-
           tor.  The ASCII file is created  in  IDRISI  version  3.x
           vector file format.  The "value" of the line or point  is
           the "z" coordinate.  Donated by Ed Riegelmann, Intergraph
           Corporation.  Works in DOS and UNIX operating system  en-
           vironments.

       11) MSLTOIDR.UCM - creates an ASCII file of MicroStation line
           string element coordinates selected by fence.  The  ASCII
           file is created in IDRISI version 3.x vector file format.
           The "value" of the line is the  "z"  coordinate.  Donated
           by Ed Riegelmann, Intergraph Corporation.  Works  in  DOS
           and UNIX operating system environments.

       12) MSSTOIDR.UCM - creates  an  ASCII  file  of  MicroStation
           shape element coordinates.  The ASCII file is created  in
           IDRISI version 3.x vector file  format.  The  "value"  of
           the shape polygon is the "z"  coordinate.  Works  in  DOS
           and UNIX operating system environments.

       13) MULTREG - performs simple or multiple regression  proced-
           ures on IDRISI images.  Outputs an ANOVA tape, a  listing
           of Beta parameter estimates  and  related  statistics,  a
           list of predicted Y values, and  (optionally)  an  IDRISI
           image which represents either the predicted Y or the res-
           idual value at each  sample  point  (pixel).  Donated  by
           Fred Edberg, Murray State University.

       14) RASCONT - given an IDRISI  image  of  raster  "polygons,"
           this module makes a contiguity  matrix  in  sparse  form.
           Donated by Rusty Dodson, NCGIA.

       15) RASDIST - given an IDRISI  image  of  raster  "polygons,"
           this module makes a distance-based spatial weight  matrix
           using inverse-power distance decay and  maximum  distance
           threshold parameters supplied by the user (the module al-
           so outputs an IDRISI-format vector file of  polygon  cen-
           troids).  Donated by Rusty Dodson, NCGIA.

       16) SP2FULL - converts sparse matrices to full format.  Dona-
           ted by Rusty Dodson, NCGIA.

       17) TGRDLG  - provides for conversion  of  line  and  polygon
           data from TIGER Line files to DLG 3.0  format.  The  pro-
           gram includes its own documentation (TGRDLG /H).  Donated
           by Minhe Ji, .

       18) VIEW    - allows a user to view, edit, and  print  IDRISI
           images under WINDOWS directly.  Donated by Horst Duester,
           University of Bern.  Note: VIEW is included in a  PKZIPed
           file which also includes IMG2BMP, a program for  convert-
           ing an IDRISI image to bitmap for use with  IMAGES  under
           WINDOWS.

       19) WINDCUT - provides for the extraction of sub-images  from
           originals as new images.  The dimension of the  sub-image
           may be read on a file or selected on the  screen  with  a
           mouse and then written to a file.  It is possible to per-
           form multiple cuts of the same rectangular  area  over  a
           set of images.  Donated by Marco Gabella, Politecnico  di
           Torino.

    b. Data sets

        1) Dr. John Snow's 1854 cholera epidemic  data  for  London.
           There are 3 vector files in this data set:

           DEATH  - cholera deaths
           STREET - London street map
           PUMP   - water well locations

           Both .VEC and .DVC files are provided.  Donated by  Rusty
           Dodson, NCGIA.

    c. Other

        1) The current IDRISI-L FAQ list.

 8. What do I need to do to donate a  module  to  the  IDRISI-L  FTP
    site?

    To donate a program or data module, contact Jay  Morgan  at  the
    address indicated above.  Arrangements will be made  for  trans-
    ferring the module to the FTP site.  Program modules should  al-
    so include a .DOC file that describes the operation of the  mod-
    ule and E-mail contact  if  additional  information  is  needed.
    Data modules should include a .DOC file that describes the scale
    of the original data (representative fraction), the date of  the
    data, a description of the data source, the method of data  cap-
    ture, projection information, and E-mail contact for  additional
    information.

 9. What graphics cards work with the new SVGA COLOR modules in Ver-
    sion 4.1?

    According to the IDRISI Project, cards that  DO  work  with  the
    SVGA COLOR modules include:

       ATI Vantage
       ATI Ultra Pro
       Diamond Speedstar 24
       Diamond Speedstar 24X
       Diamond Speedstar Pro
       Diamond Viper VLB
       Genoa 8545 VL - 24 bit
       Paradise
       Swan Palette Plus 24
       Trident 8900C

    Note that some users have reported  problems  with  the  Diamond
    Speedstar 24X and Trident 8900C  cards,  but  other  users  have
    gotten them to work.  To make the Diamond Viper VLB  card  work,
    install the Viper utilities into a directory on your hard drive.
    Type the following command at the  prompt:  VPRMODE  VESA.  This
    runs VPRMODE.EXE and loads the VESA driver.  To uninstall, type:
    VPRMODE VESA -U.

    Chipsets that have worked with the SVGA COLOR modules include:

       ATI
       Cirrus
       ET4000 (Tseng 4000)
       Paradise
       Western Digital (Diamond Speedstar 24X & Pro)
       Video7

    The following information regarding graphics cards may  also  be
    useful to you:

    a. Note that some strange results have been reported  when  run-
       ning WHICHVGA on Cirrus cards.

    b. If you are having strange problems with the display, but  you
       are getting something, the problem may be your mouse  driver.
       IDRISI modules support the Microsoft  mouse  driver.  If  you
       have a different mouse or mouse driver, try using a Microsoft
       one.  In particular, if you have a Genius  mouse  driver,  it
       will not work.  Other ones may or may not work.

    c. Load the mouse driver before entering into the COLOR modules.
       If a mouse driver is not present in memory, you will  not  be
       able to exit the module by hitting Esc or  Ctr-l  Break.  You
       will have to reboot.  This is not the case for the VGA  COLOR
       (COLOREVA) or COLOR85.  It has to do with a 3rd party  driver
       IDRISI uses for the SuperVGA modules.

    d. If your card or chipset is supposed to work, but does not, it
       may need to be configured for your monitor.

    e. Sometimes you have to run a program to  put  your  card  into
       VESA  mode.  For  example,  with  ATI  cards,  you  must  run
       VVESA.COM.

10. Are there any useful tips or tricks for Version 4.1 that I  have
    been identified by IDRISI users?

    a. The PLOT module in DISPLAY requires a minimum of 560K of  RAM
       to work properly from the Menu System or 510K of RAM from the
       DOS prompt.  If you get a "GKS GRAPHICS ERROR" when trying to
       plot a vector file, free up more RAM, reboot  your  computer,
       and then try to run PLOT.

    b. If you have trouble trying to import a DEM using the DEMIDRIS
       module (particularly if you get an "UNABLE TO READ 0.0  AS  A
       REAL NUMBER" error), first try editing the DEM  as  follows
       before rerunning DEMIDRIS:

       Replace "0.0                  " with "0.0000000000000000D+00"

       Note there are 18 spaces after the 0.0 in the "from  string,"
       and 15 zeros after the 0. in the "to string."

    c. If TIFIDRIS bombs when you are trying to import a TIFF  file,
       try the following:

        1) Rerun TIFIDRIS and note the information  on  the  screen,
           particularly the number of rows, number of  columns,  and
           file header size.  Note that even if TIFIDRIS  bombs,  it
           will most likely create the palette (.PAL  file) for  the
           TIFF file (check your data directory or  subdirectory  to
           be sure).

        2) Run BIPIDRIS and use the information from TIFIDRIS to try
           to read the TIFF file.

    d. The following is a blue-to-gray-red palette that was  donated
       by Rusty Dodson, NCGIA:

        0  0  0  0
        1  0  0 63
        2 30 30 63
        3 40 40 63
        4 50 50 60
        5 40 40 50
        6 30 30 40
        7 20 20 25
        8 20 20 20
        9 25 20 20
       10 40 30 30
       11 50 40 40
       12 60 50 50
       13 63 40 40
       14 63 30 30
       15 63  0  0

    e. The following is a hysometric tint palette that  was  donated
       by John Harmon, Central Connecticut State University:

        0  0  0  0
        1 20 20 63
        2 30 30 63
        3 48 48 63
        4  3 53 63
        5 61 61 61
        6 13 63 13
        7 30 63 30
        8 48 63 48
        9 63 51 38
       10 63 46 29
       11 63 39 13
       12 63 63 13
       13 63 63 31
       14 63 63 44
       15 63 63 63

       Codes 1 through 4 are blues for bathymetry in decreasing  in-
       tensity for shallower depths; code  5  is  for  near  coastal
       shallow depths (almost but not quite white); codes 6  through
       8 are greens in increasing intensity as elevations  increase;
       codes 9 through 11 are browns  in  increasing  intensity  for
       increasing elevations; and codes 12 through  15  is  a  color
       range from yellow to white for the highest elevations.

    f. The following is a suggested procedure for converting scanned
       polygon boundaries into IDRISI raster format:

        1) The map which is to be scanned should contain nothing but
           polygon boundary lines.  Use whiteout to remove  unwanted
           features or trace the boundaries onto a separate sheet of
           paper.  The map should be scanned as a bitmap image,  not
           a gray tone image.

        2) Scan the image at a high enough resolution  so  that  the
           boundary lines are at least a couple of pixels  wide  (so
           that each polygon is separated  from  other  polygons  by
           border pixels.  Convert the image to IDRISI format  using
           the TIFIDRIS module.

        3) Use CONTRACT to shrink the image (by pixel  thinning)  to
           the desired resolution.  This  should  also  remove  most
           spurious pixels which may have been created  by  scanning
           "dirty spots" on the map.  If a  lot  of  small  spurious
           pixels remain, you can use FILTER with  the  mode  filter
           option to remove many (hopefully all) of these pixels.

        4) Now the IDRISI image should  be  mostly  correct,  except
           there are border cells that will need to be  removed  be-
           tween polygons.  Use ALLOCATE to allocate these cells  to
           the nearest  polygon.  A  few  pre-processing  steps  are
           necessary before running ALLOCATE.

           a) Use RECLASS to reclassify border cell values to  zero,
              and reclassify  background  cells  to  an  arbitrarily
              high value (this is done so that  border  cells  which
              are closer to the background that the polygon will  be
              allocated to the background).

           b) If the reclassified is not in  integer/binary  format,
              CONVERT it to this format.

           c) Use DISTANCE on the reclassified image.  This will as-
              sign each zero cell (border cell) a value equal to the
              distance to the nearest non-zero cell.  This image  is
              neded as an input to the ALLOCATE module.

           d) Use ALLOCATE to allocate  border  cells  to  polygons.
              For input, use the image from step c) as the "distance
              image," and use the image from step a) or  b)  as  the
              "target image."

        5) Use RECLASS to reclassify the background pixels  to  zero
           (or anyother desired value).  The image should  now  con-
           tain raster polygons with no border pixels between  them.
           If desired, you can run GROUP again to renumber the poly-
           gons  continuously  from  1  to  n.  Alternatively,   use
           RECLASS to  reclassify  polygon  values  to  the  desired
           polygon-id values.

       This procedure was donated by Rusty Dodson, NCGIA.

    g. The following are several suggestions for  converting  IDRISI
       images to .BMP and .GIF formats:

        1) Display the IDRISI image with COLOR or ORTHO, and  "grab"
           it with a "screen grabber" such as HiJak or Pizazz  Plus.
           Most screen grabber packages provide for  manipulation of
           the image and export to formats such as .BMP and .GIF.

        2) The TIFIDRIS module writes a .TIF file which can then  be
           read by many graphics programs such as  Paint  Shop  Pro,
           Graphics Workshop for Window, or Corel Draw.  The  graph-
           ics program can then be used to export to other formats.

        3) The IMG2BMP module on the IDRISI-L FTP site  writes  .BMP
           files directly from IDRISI.

    h. The GEOREF subdirectory includes .REF  files  for  converting
       NAD 27 to NAD 83  coordinates  (and  vice  versa).  The  .REF
       files reference NAD 27 coordinates in feet and NAD 83  coord-
       inates in meters.  To convert NAD 27 coordinates  to  equiva-
       lent NAD 83 coordinates in feet, you will need  to  create  a
       new .REF file for the NAD 83 coordinates, change the  "origin
       X" (false easting)  from  meters  to  feet,  and  change  the
       "units" from meters to feet ("m" to "ft").

    i. The following is a recommended procedure for importing  DEM's
       from the USGS FTP site into IDRISI:

        1) Download the file and its associated text file  from  the
           USGS FTP site.  Use the UNIX uncompress utility to  UNZIP
           the DEM.  Download the DEM to your PC.

        2) Change the IDRISI environment to the directory or sub-di-
           rectory containing the DEM.

        3) Use the CR/LF module with option 3 to  add  carriage  re-
           turns where there are only line feeds.  Note:  this  usu-
           ally takes from 15 to 20 minutes).

        4) Use the VAR2FIX module with option 2, and set  the  fixed
           length 1024.  Note: this usually takes about 10 minutes.

        5) Import the DEM into IDRISI  using  the  DEMIDRIS  module.
           Note: this usually takes 5 or more hours.

        6) To view the DEM, set the viewing parameters by  hand  and
           use a scale factor of -5 to view the entire DEM.

    j. The following is a recommended procedure for importing IDRISI
       DEM's into the VistaPro program:

        1) Convert the DEM image into integer-binary format.

        2) Use the TRANSPOS module in IDRISI to invert the DEM  (the
           bottom row should now be at the  top,  and  the  top  row
           should now be at the bottom).

        3) Rename the TRANSPOS'ed image to end as .BIN  rather  than
           as .IMG.

        4) Start VistaPro and use the LOAD menu BINARY  file  format
           option to load the DEM.  By default, VistaPro expects the
           cell size to be 30 meters by 30 meters.  You may need  to
           adjust the vertical exaggeration when you display the DEM
           to allow for a different cell size.

        5) A land cover map can  also  be  imported.  It  should  be
           inverted and then reclassed so that  the  numbers  repre-
           senting the various  land  cover  classes  correspond  to
           those defined by VistaPro (see the VistaPro manual).

        6) The reclassed land cover image must  be  converted  to  a
           .PCX format.  One  way  of  doing  this  is  to  use  the
           TIFIDRIS module to convert the image to  a  .TIF  format,
           and then use a paint program that can import a .TIF  file
           and export a .PCX file.  During this process, you must be
           careful to maintain the same numbers of rows and  columns
           in the .PCX file as in the .TIF file.

        7) Start VistaPro and use the IMPEXP menu PCX - COL  option
           to import the land cover image (.PCX file) and convert it
           to VistaPro's internal color table for use with the DEM.

       Note: this procedure was donated by Douglas Crawford,  School
         of Landscape Architecture,  The  University  of  New  South
         Wales, D.CRAWFORD@UNSW.EDU.AU.

11. What other programs are available for use with IDRISI?

    a. SpaceStat is a program that covers  a  range  of  descriptive
       spatial statistics, measurements of spatial  autocorrelation,
       and tools to implement spatial analysis  in  regression  mod-
       els.  The program interfaces with IDRISI along  with  several
       other GIS packages.  The package, which was developed by  Luc
       Anselin, NCGIA, is available for academic and non-profit  or-
       ganizations for $250 (including the GAUSS  run  time  module)
       or for $250 without the GAUSS module.  Additional  copies  of
       SpaceStat are available for lab use with no manual  for  $65;
       additional copies of the manual are $50.  The cost of  Space-
       Stat to  for-profit  organizations  is  $500.  Rusty  Dodson,
       NCGIA, has prepared a tutorial to supplement  SpaceStat.  The
       tutorial is NCGIA Technical Report 93-5, "Teaching  Introduc-
       tory Geographical Data Analysis with GIS: A Laboratory  Guide
       for an Integrated SpaceStat/IDRISI Environment."  The  report
       contains student laboratory  exercises  for  an  introductory
       course on spatial analysis.  The report costs $13.50 and  in-
       cludes a disk with datasets.  Contact the  NCGIA  for  addit-
       ional information regarding  SpaceStat  or  Technical  Report
       93-5.

    b. FRAGSTATS is a spatial pattern analysis program for quantify-
       ing landscape structure.  The raster version of  the  program
       will read IDRISI image files (the vector version is  for  use
       with ARC/INFO coverages).  FRAGSTATS generates area  metrics,
       diversity metrics, and contagion and  interspersion  metrics.
       A PC version of the program,  along  with  documentation,  is
       available via anonymous FTP at  FSL.ORST.EDU.  FRAGSTATS  can
       be found in the PUB directory.  Be sure to read the README.PS
       file and the documentation in the MAN directory; installation
       and operation instructions can be found in the  FRAGSTATS.DOC
       file in the raster and vector directories.

    c. FMAGDIGT is a package that converts field mapping data (field
       survey notation) into  mapping  coordinates  for  IDRISI  and
       SURFER (or into an HPGL plotfile).  The program provides  for
       the use of conventional field mapping methods  (traverse  and
       intersection) to solve either planimetric or three-dimension-
       al survey  problems.  FMAPDIGT  is  available  from  the  AAG
       Microcomuter Specialty Group IBM Software Exchange for $1.00.
       Contact Bob Sechrist, Indiana University of Pennsylvania,  at
       RPSECRST@IUP.

    d. The NCGIA GIS Laboratory Exercises  Volume  1  includes  five
       exercises  for  IDRISI  (along  with  three   exercises   for
       pcArc/Info.  The exercises, which  are  designed  to  support
       the NCG