What kind of results are you hoping to get in the end? You say you want to do line-of-sight analysis. It is increasingly unclear to me what are the specific outcomes you are looking for: whether your x2y2 point is visible from x1y1? a map of the cells between x1y1 and x2y2 that are visible when you look from x1y1 to x2y2? something else? Running r.profile on a r.los map that you have reclassified to binary would ID the visible cells between x1y1 and x2y2. You can visually tell if x2y2 is visible from x1y1. I can't tell what you are trying to do.
Michael On 10/22/07 5:31 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > hi, > i want tyo find a line of site between two co-ordinates x1,y1 to x2,y2 > then i wrote r.reclass input=map outpuy=mapout >> then i specified two co-rdinates for two points > but not able to get the output > culd you tell me how to write using x1y1 and x2y2 > plz > > > Use reclassify interactively or recode interactively from the menu. Put the >> name of the file you want to reclassify (for integers) or recode (for >> floating point values) in the entry box. You'll need to specify and output >> file too. >> >> Then enter your rules into the text box below and click "apply" or "run". >> You'll need to know what the values are for your line (between point of >> observer and what you want to see). >> >> Recode rules: >> >> line value min:line value max:1:1 >> rest value min:rest value max:0:0 >> >> Reclass rule: >> >> [line value min] thru [line value max] = 1 >> * = 0 >> >> Michael >> >> >> On 10/21/07 11:30 PM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: >> >>> hi, >>> for reclass/recode we need to type Title field also for the rule: >>> can you tell me how to fill up that:help says >>> Map type conversion >>> To simply convert a raster between formats (eg. int to float) the user would >>> use the first argument. For example >>> 10:1500:0.1:15.0 >>> would convert an old raster with range between 10 and 1500 to a float raster >>> with range bewteen 0.1 and 15.0. >>> >>> Value replacement >>> r.recode can be used to replace existing cell values by others. The >>> formatting >>> is as described above. In following example the values 1, 2 and 3 are >>> replaced >>> by 1.1, 7.5 resp. 0.4: >>> >>> r.recode in=oldmap out=newmap << EOF >>> 1:1:1.1:1.1 >>> 2:2:7.5:7.5 >>> 3:3:0.4:0.4 >>> EOF >>> >>> can you explain me how to go about it like: >>> 1. I have a dgn vector map which i have convetred it into raster >>> 2. Now for finding line of sight i will take say two points..one with name >>> "a" >>> and another name"b" now how will i reclass or recode the values..and what >>> dose >>> this value actually mean? >>> plz support me > >>> >>> >>> >>> Jainita, >>>> >>>> Create a map with the line of sight you want to analyze. Reclassify it >>>> (r.reclass or r.recode) to make the cells in the line you want to analyze 1 >>>> and the rest of the cells 0. >>>> >>>> Michael >>>> >>>> >>>> On 10/21/07 10:40 PM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: >>>> >>>>> Hi, >>>>> thank you for yr advice butcan you tell me how to prepare this binary file >>>>> >>>>> Thanks, >>>>> jainita> >>>>> >>>>> >>>>> >>>>> Jainita, >>>>>> >>>>>> Use the binary map setting to specify the area you want to do visibility >>>>>> analysis for. It should be 1 where you want visibility/los calcuations >>>>>> and >>>>>> 0 >>>>>> where you don't want this calculated. >>>>>> >>>>>> Michael >>>>>> >>>>>> >>>>>> On 10/17/07 9:30 PM, "jainita" <[EMAIL PROTECTED]> wrote: >>>>>> >>>>>>> Hi,I tried with r.los but it gives visibility all over i.e in 360degree >>>>>>> for >>>>>>> the distance specified. >>>>>>> But I want only between two points in a line i.e not 360 degree so can >>>>>>> you >>>>>>> help me with it. >>>>>>> I would be really oblige if you help me since I am racking my mail a lot >>>>>>> on >>>>>>> this and still unable to find the solution >>>>>>> Thanking you once again >>>>>>> >>>>>>> -----Original Message----- >>>>>>> From: Michael Barton [mailto:[EMAIL PROTECTED] >>>>>>> Sent: Wednesday, October 17, 2007 7:59 PM >>>>>>> To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; >>>>>>> [EMAIL PROTECTED]; >>>>>>> [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; >>>>>>> [EMAIL PROTECTED]; [EMAIL PROTECTED]; >>>>>>> [EMAIL PROTECTED] >>>>>>> Subject: Re: r.mapcalc >>>>>>> >>>>>>> Use r.los for line of site calculations. >>>>>>> >>>>>>> Michael >>>>>>> >>>>>>> >>>>>>> On 10/17/07 5:36 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: >>>>>>> >>>>>>>> hi, >>>>>>>> i am working on grass and want to know how r.mapcalc can be used for >>>>>>>> calculation of pat_map/mask. >>>>>>>> syntax says---------------r.mapcalc pat)mkap="if(where_you_want,1, 0)" >>>>>>>> for >>>>>>>> creating a map which can be used to calcualte line of sight between two >>>>>>> points >>>>>>>> can anyone elaborate on it with an eg:say i want to know what all is >>>>>>>> beign >>>>>>>> seen between any two co-ordinate in map. >>>>>>>> Please help,i am doing for the first time >>>>>>>> >>>>>>>> Thanking You, >>>>>>>> Jainita >>>>>>> >>>>>>> __________________________________________ >>>>>>> Michael Barton, Professor of Anthropology >>>>>>> Director of Graduate Studies >>>>>>> School of Human Evolution & Social Change >>>>>>> Center for Social Dynamics & Complexity >>>>>>> Arizona State University >>>>>>> >>>>>>> phone: 480-965-6213 >>>>>>> fax: 480-965-7671 >>>>>>> www: http://www.public.asu.edu/~cmbarton >>>>>>> >>>>>>> >>>>>> >>>>>> __________________________________________ >>>>>> Michael Barton, Professor of Anthropology >>>>>> Director of Graduate Studies >>>>>> School of Human Evolution & Social Change >>>>>> Center for Social Dynamics and Complexity >>>>>> Arizona State University >>>>>> >>>>>> phone: 480-965-6213 >>>>>> fax: 480-965-7671 >>>>>> www: http://www.public.asu.edu/~cmbarton >>>>>> >>>>>> >>>> >>>> __________________________________________ >>>> Michael Barton, Professor of Anthropology >>>> Director of Graduate Studies >>>> School of Human Evolution & Social Change >>>> Center for Social Dynamics & Complexity >>>> Arizona State University >>>> >>>> phone: 480-965-6213 >>>> fax: 480-965-7671 >>>> www: http://www.public.asu.edu/~cmbarton >>>> >>>> >>>> >> >> __________________________________________ >> Michael Barton, Professor of Anthropology >> Director of Graduate Studies >> School of Human Evolution & Social Change >> Center for Social Dynamics & Complexity >> Arizona State University >> >> phone: 480-965-6213 >> fax: 480-965-7671 >> www: http://www.public.asu.edu/~cmbarton >> >> >> __________________________________________ Michael Barton, Professor of Anthropology Director of Graduate Studies School of Human Evolution & Social Change Center for Social Dynamics & Complexity Arizona State University phone: 480-965-6213 fax: 480-965-7671 www: http://www.public.asu.edu/~cmbarton _______________________________________________ grassgui mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassgui
