CORE MODULES

: Converts between all of the image storage formats supported by IDRISI. Files may be converted to any combination of the byte, integer and real (floating point) data types and the ASCII, binary and packed (run-length encoded) file structures.

MAINT

: A file maintenance utility.

CONFIG

: A hardware configuration utility.

CONV3TO4

: Converts Version 3 data files to Version 4 format.

BATCH324

: Converts groups of Version 3 data files to Version 4 format.

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Display Modules

COLOR

: Produces color output of raster images with integrated vector display on EGA, VGA and SuperVGA graphics systems. COLOR also provides interactive inquiry, on-screen digitizing, interactive zoom, vector file overlay, interactive palette selection and adjustment and interactive legend editing. With SuperVGA graphics adaptors, high resolution displays (up to 1024 ´ 768) of color composite images (256 color) can be produced.

COLOR85

: A special version of COLOR for the 8514/A graphics adaptor capable of displaying color composite images (256 color) at high resolution (1024 ´ 768).

ORTHO

: Produces a 3-D orthographic perspective plot of surface data with optional draping of a second color image.

ORTHO85

: A special version of ORTHO for the 8514/A graphics adaptor capable of displaying color composite images at high resolution.

IMAGE

: Produces a grey-scale image (up to 32 levels) using a half-tone procedure on dot-matrix, ink-jet and laser printers.

PLOT

: Produces vector plots on screen, HPGL plotters and selected printers.

PAINT

: A color output module for the HP Paintjet, Paintjet XL, XL300 and the Deskjet 500C, 550C and 1200C.

DISPLAY

: A universal display routine using ASCII characters.

VIEW

: Allows direct examination of the data values in any portion of an image. Output precision is user-specified.

HISTO

: Produces histograms of image file values. In addition to the graphic output, numeric output includes proportional and cumulative frequen- cies along with simple statistics.

STRETCH

: Produces linear, linear with saturation and histogram equalization contrast stretches in preparation for image display.

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Data Entry

TOSCA

: An independent universal digitizing module distributed with IDRISI.

POINTRAS

: Point-to-Raster conversion.

LINERAS

: Line-to-Raster conversion.

POLYRAS

: Polygon-to-Raster conversion.

INITIAL

: Initializes a new image with a constant value.

UPDATE

: Keyboard entry/update of image data.

EDIT

: A simple ASCII text editor for use with creating a variety of IDRISI data files. With values files, EDIT creates and maintains proper documenta- tion files automatically.

INTERPOL

: Interpolates a surface from point data using either a weighted-distance or potential surface model.

INTERCON

: Interpolates a surface from a set of contours by linear interpolation.

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Attribute Data Management

ASSIGN

: Creates an image from an attribute values file by assigning the data values contained in the attribute values file to the cells belonging to defined regions. ASSIGN can also be used to reclassify integer images.

EXTRACT

: Creates an attribute values file from an image by extracting a summary of data values found within defined regions. The summary (minimum, maximum, range, total, mean, or standard deviation) may also be output as a table.

DBIDRIS

: Used to import dBASE files into IDRISI values files, and move IDRISI values files back into dBASE format.

see also EDIT , UPDATE , RECLASS and COLSPACE .

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Spatial Data Management

PROJECT

: Undertakes conversions between reference systems for both vector and raster files. With raster images, a resampling is undertaken using either a nearest-neighbor or bilinear interpolation. Supported projections include the Mercator, Transverse Mercator, Lambert Conformal Conic and Plate Carree. By using reference system parameter files, a limitless number of reference system conversions can be undertaken. Full forward and backward transformations are accommodated using ellipsoidal formulas. PROJECT also incorporates the US National Geodetic Survey's NADCON procedure for converting between NAD27 AND NAD83 and the Molodensky transform equations for all other datums. Over 200 reference system parameter files are supplied with the module, including all US State Plane (SPC) systems for NAD27 and NAD83 and a complete set of UTM zones based on WGS84 for the northern and southern hemispheres. In addition, users can construct reference system parameter files for any system based on a supported projection.

RESAMPLE

: Determines the data values for a rectangular grid by interpolation of the values in a different (and possibly warped) grid. Linear, quadratic and cubic mappings between the grids are provided, along with nearest-neighbor and bi-linear interpolations. Vector files may also be trans- formed with this Òrubber sheetÓ procedure.

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