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Mary river coastal plain subsurface hydrology study 1992.



Mary river coastal plain subsurface hydrology study 1992.


Chin, D.; Martin, K.; Schwartz, T.; Jolly, P.


E-Publications; E-Books; PublicationNT; Report ; 20/1993




Made available via the Publications (Legal Deposit) Act 2004 (NT).





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Power and Water Authority

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Report ; 20/1993

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Technical Report WRD93020 Viewed at 15:07:19 on 29/07/2010 Page 73 of 132. Filtering of the linage with a 3 x 3 median filter using the FILTER program from the image transformation menu produced a smoothed linage which had more solid colours with enhanced contrast. This improved broadscalc definition within the image was achieved at the expense of image detail. The second transformation performed was a principal component analysis using the PCTRAN program. This transformation defines a rotation of the original axes such that the data (ie brightness values) are along axes of decreasing variance. This transformation linproved the definition of the palaeochannels and water courses. Further image processing was attempted on the MSS 24/12/75 data set to remove the effects of cloud from the image. An affine transformation of the channels was conducted using the CALClJLA program to create new channels. The procedure, as outlined in Harrison and Jupp 1990 pages 148 - 152, was applied to try to remove the atmospheric noise but only the edges or lighter cloud was removed. The main mass of cloud still masked the area of interest. \-Vith more processing and enhancement the remaining cloud could possibly be removed. Hard copies of the linages enhanced on MicroBRIAN were produced by NTU's Remote Sensing Laboratory on their CALCOMP colour 300 dpi wax printer. The process to get from image file to colour print involved importing of the image into ARCINFO (a geographical information system program) on their SUN workstation, reformatting the image data and exporting it to IlVfAGE-fN (scanner image processing program). From Il\1AGE-IN, the software which could communicate with the printer, the image was sent to the printer for output. Scaling of the colour print was achieved by ealculating the required number of pixels and lines that could fit on the maximum A3 size printer output and subsetting the image accordingly.

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