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MERISVIEW |
MERISVIEW Step by step User Manual
Before starting IDL edit the merisview.pro file and modify the value of the variable IDL_LOCAL to reflect your own installation - this directory is the one that holds the merisview directory. Make sure to specify the full path for this directory - a relative path will make the software very unstable.
Also, specify the DATABASE_DIR variable (full path also); this is the name of the directory that holds the configuration files index_*.txa and database.db essential to read MERIS products.
Then, under the IDL prompt, just run the following command :
@MERISVIEWDIR/merisview
where MERISVIEWDIR is the directory where the merisview software is located.
Click on the button Load new field in the main window, you are then asked to select a file. Once the file has been selected, MERISVIEW identifies the type of file it is and creates a window that gives the fields that are available. An example of such a window is given below :
You just then need to select the fields with the mouse, you may download fields from multiple files (of similar type or not) in each session.
Once you have loaded several fields, you would like to display them in the main window, to do so you just need to click on the button located on the right side of Current field in the upper part of the main window. You will then get the list of available fields as follows :
and you just need to select with the mouse the field you wish to display.
If you have retrieved some flags from one or multiple files you can mask your image by combining the flags as you wish. To do so, click on the Update Mask button of the main window. A window should then appear that gives the list of all available flags for your session, the list of available flags may change from session to session as you download flags from different file types. An example of such a window is given below :
The AND and OR buttons allow to respectively chose whether you want to mask pixels that have been masked with all the flags selected or whether you want to mask the pixels that have been masked with any of the flags selected.
The Reset button will unselect all previously selected flags and keep this window open and active.
The Accept and Quit button will take into account your selection, mask the image accordingly, and close this window.
The Accept button will take into account your selection, mask the image accordingly, but will keep this window open and active.
The min/max values of the current field are given just above the image; these are used to build the colorbar of the current image, i.e. the smallest value is given the color index 0 and the highest value is given the highest color number minus one (the highest being reserved for white). You may change those values with the keyboard or with the mouse using the two sliders located just below the min/max values - anything outside the range [min,max] will be masked and appear in white on your image.
Make sure that the colorbar window is open, if not then you should click on the colorbar button of the main window and a colorbar will automaticaly show up.
Make sure that the title window is open, if not then you should click on the title button of the main window and a title will automaticaly show up. To change the text you will have to open the preferences window.
Select your projection (Mercator etc.) and specify the map parameters in the Preferences window and your image will appear on top of the specified map projection.
Select Image > Zoom ; a new window should show up w/ the area located below the cursor zoomed, the cursor location corresponds to the center of this new window. You may change the zoom factor by clicking on the center button of the mouse and you quit the zoom by clicking on the right button of the mouse.
Select General > Preferences to display the preferences window where you will be able to configure the software as you like.
Click on the Statistics button to display the statistics pannel, you may select the statistical analysis of your choice in the preferences window.
You may print the image either in a file (Postscript, GIF, JPEG, TIFF) or directly to a printer. To do so, pull down the General menu in the main menu and select the output format in the Save Display in sub menu as follows :
or click directly on Print Hardcopy if you want to send the display to your local printer - you may specify the printing command in the Preferences window.
The feature is currently under development but you will be able to do that by selecting General > Data Input/Output > Save as follows:
Chose a *.SAV file saved in a previous session after selecting General > Data Input/Output > Retrieve .
