"Hiden" options

Mirone still has a LOT more of options that are not ranged in menus, for the simple reason that there is no way to do it without complicating enormously the graphical interface. Instead, they only show up when the situations make it appropriate and than they are accessible with a mouse right-click on a graphical element. For example, polygons drawn on a grid derived grid let you do a median filter that is applied only to the grid nodes inside the polygon. I wrote this option at sea when I wanted to get rid of those awful effects that result on the overlap of contiguous swaths on multi-beam surveys. On the other hand, if the polygon is an exact rectangle you can do FFT like operations. Another example is given by right clicking on the axes coordinates. If the grid is in geographical coordinates, you can than select among several different ways of displaying degrees (eg, dd.xxxx or dd:mm:ss). Furthermore, if you decide to save a line into an ascii file, the x,y coordinates will be formatted in the same way as the selected coordinate display. I hope that this will be appreciated by those of you who know what is getting a way points, picked on a computer screen in deg.xx, go up to the ships bridge and listen the Captain (or whoever is driving the ship that dawn) tell you “Cant you give me those way points in degrees and minutes?”

A very cool new thing in 1.4 is the capacity to copy-and-paste lines between Mirone windows. One only have to set the target line in edit mode (by double-clicking on it) and that hit Ctrl-C followed by a Ctrl-V on the destination window. Furthermore, since the line is stored in the (sorry, Windows clipboard) one can past it anywhere else that Windows accept (text editors, EXCEL, etc …).

Another probable unique feature is the capacity of immediately display the contents of shape files (well, maybe not all of them) or ASCII .dat files. Instead of working as an text editor, the contents of x,y .dat files are magically displayed. Just try to drop the $MIRONEROOT\data\gp_girl.dat into the icon of the compiled version or open it via “Datasets -> External db” on an empty window. Hum, nice girl …

The example figure below shows the options available when one right click on a previously plotted rectangle. On the lower left corner we can see a part of the rectangle, which has little red squares over the vertices.  This indicates that the square is in edition mode and may be rescaled/moved in the normal way of click-and-drag. Notice that the options under “Crop Tools”, already described in this manual, will operate only inside the area delimited by the rectangle. The same would happen if we had drawn an irregular polygon.

Still another (simple) method to georeference images is provided by the “Register Image” option. If selected, the user is prompted to enter the rectangles four corners coordinates in the new reference system. After filling the necessary information the image is than referenced to that new system.



Copyright © <2010>, <Joaquim Luis>

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