--- Start of Idrisi List message Thanks to Hussein Gadain and Ricardo Bomfim Machado for their responses to my question: >I have a cost-distance map for which I want to extract area values. The >Extract module gives a choice of Max, Min, Mean, Range, etc as the values >that can be extracted. Is it possible to modify the module to add choices? >I want to get the median value, but perhaps there is another way of finding >that. ----- >From Hussein Gadain: I am not sure whether you are aware of WINDISP4 (the latest version of windisp3). In that software it is possible to extract the median values from a boundary file in this case it is your vector file. 1. go to windisp4 2. select process import idrisi vector 3. your idrisi vector is now a bna file. 4. go to process extract stas median. your images should be listed in a .lst fiel if you have many images. otherwise enter the image name (it should aslo be in windisp4 format, use the same import function to import it from idrisi) You can download windisp4 at: http://ag.arizona.edu/~epfirman/windisp4.html install it you PC and try. I am sure many things will arise and will like this software. The software was designed nmainly for FEWS and USAID to help display and alaysis of satellite data, mainly CCD, RFE and NDVI. ----- >From Ricardo Bomfim Machado: There is another way to get the cell value to perform statistics. You can create a mask map and use the QUERY command, which extracts the cells values to a ASCII file. Then, you can import it in a statistical package and execute the statistic procedure that you want. This method is only painful when you have many areas to extract the values. Thanks again, ct --- End of Idrisi List message IDRISI-L is an unmoderated list. As a service to list users, please post a summary of useful responses to your questions. To post a message to IDRISI-L, send it to [EMAIL PROTECTED] To subscribe to the list, send an email from the address to be subscribed to [EMAIL PROTECTED] with "subscribe" (without quotes) as the first line of the message body. To unsubscribe, do the same, only with "unsubscribe" as the first line of the message body.
