[gradsusr] lon lat to km
wendi harjupa
wendiharjupa at gmail.com
Tue Feb 5 07:17:15 EST 2013
Dear Mr. Jeff
Thank you very much for your explanation,
I tried that script, but the result (plot) not in KM but still in lon and
lat
Here I attached the result (try.gif).
I am sorry, I do not understand about ((lon-100) and ((lat-0) in script
below,
because when I change the number, for example ((lat-0) become ((lat-1), the
result was same.
'define xdist = ((lon-100)/0.004492369)*(dx/2)'
'define ydist = ((lat-0)/0.004522556)*(dy/2)'
I tried to display xdist, but the result was very strange as I attached in
this email (xdist.gs).
I am very sorry I asked you many time. But please help me to get more
closer to solve this problem.
Thank you very much
Best regards
On Tue, Feb 5, 2013 at 2:30 AM, Jeff Duda <jeffduda319 at gmail.com> wrote:
> Don't change these four statements from what I have suggested:
> 'define dx = *6.371e3**cos(-1*(3.14159/180))*cdiff(lon,x)*(3.14159/180)'
> 'define dy = *6.371e3**cdiff(lat,y)*(3.14159/180))'
> 'define xdist = ((lon-100)/0.004492369)*(dx/2)'
> 'define ydist = ((lat-0)/0.004522556)*(dy/2)'
>
> In the definitions of dx and dy, the grids lon and lat, and dimension
> expressions x and y must be entered exactly as that. Do not replace any of
> those values with anything else. The rest is fine.
>
> Jeff
>
>
> On Mon, Feb 4, 2013 at 1:49 AM, wendi harjupa <wendiharjupa at gmail.com>wrote:
>
>> Dear Mr Jeff
>>
>> Thank you very much for your guidance
>>
>> Here the script
>>
>> 'reinit'
>> 'open try2.ctl'
>> 'set grads off'
>> 'set mproj latlon'
>> 'set mpdset hires'
>> 'set gxout shaded'
>> 'set grid on'
>> 'set lon 100 101'
>> 'set lat -1 0'
>> 'define dx = *6.371e3**cos(-1*(3.14159/180))*cdiff(100,0)*(3.14159/180)'
>> 'define dy = *6.371e3**cdiff(-1,0)*(3.14159/180))'
>> 'define xdist = ((lon-100)/0.004492369)*(dx/2)'
>> 'define ydist = ((lat-0)/0.004522556)*(dy/2)'
>> 'set z 5'
>> 'set t 1'
>> 'd ref'
>>
>> The script is similar with the script that you suggested.
>> But, I tried to make changes in many points
>>
>> for example :
>>
>> 'define dx = *6.371e3**cos(-1*(3.14159/180))*cdiff(100,0)*(3.14159/180)'
>> 'define dy = *6.371e3**cdiff(-1,0)*(3.14159/180))'
>> 'define xdist = ((100 - 101)/0.004492369)*(dx/2)'
>> 'define ydist = ((-1-0)/0.004522556)*(dy/2)'
>>
>> or I tried to make plot
>>
>> 'd xdist'
>>
>> But, always I got error message.
>>
>> Please teach me more.
>>
>> Best regards,
>> wendi
>>
>>
>> On Mon, Feb 4, 2013 at 3:25 AM, Jeff Duda <jeffduda319 at gmail.com> wrote:
>>
>>> What does your script look like now?
>>>
>>> Jeff
>>>
>>>
>>> On Sun, Feb 3, 2013 at 6:55 AM, wendi harjupa <wendiharjupa at gmail.com>wrote:
>>>
>>>> Dear Mr. Jeff
>>>>
>>>> Thank you very much for your guidance as far..
>>>> But, I am very sorry for asking you many times..
>>>> since it is very difficult for me..
>>>>
>>>> I tried to change some parts of script, but still this did not run..
>>>> I got error message as below :
>>>>
>>>> Error from CDIFF: Specified dimension non varying
>>>> Operation Error: Error from cdiff function
>>>> Error ocurred at column 31
>>>> DEFINE error: Invalid expression.
>>>> *** glibc detected *** grads: corrupted double-linked list: 0x089e2918
>>>> ***
>>>> Would you mind to explain more??
>>>>
>>>> Thank you very much
>>>>
>>>> Best regards,
>>>> wendi
>>>>
>>>> On Sun, Feb 3, 2013 at 1:46 AM, Jeff Duda <jeffduda319 at gmail.com>wrote:
>>>>
>>>>> Use this code:
>>>>>
>>>>> 'reinit'
>>>>> 'open try2.ctl'
>>>>> 'set grads off'
>>>>> 'set mproj latlon'
>>>>> 'set mpdset hires'
>>>>> 'set gxout shaded'
>>>>> 'set grid on'
>>>>> 'set lon 100 101'
>>>>> 'set lat -1 0'
>>>>> 'define dx = *6.371e3*
>>>>> *cos(-1*(3.14159/180))*cdiff(100,0)*(3.14159/180)'
>>>>> 'define dy = *6.371e3**cdiff(-1,0)*(3.14159/180))'
>>>>> 'define xdist = ((lon-100)/0.004492369)*(dx/2)'
>>>>> 'define ydist = ((lat-0)/0.004522556)*(dy/2)'
>>>>> 'set z 5'
>>>>> 'set t 1'
>>>>> 'd ref'
>>>>>
>>>>> The square brackets were just to show different groupings. When it
>>>>> comes time to code it, you must use only parentheses.
>>>>>
>>>>> The above should work.
>>>>>
>>>>> Jeff
>>>>>
>>>>> On Sat, Feb 2, 2013 at 1:41 AM, wendi harjupa <wendiharjupa at gmail.com>wrote:
>>>>>
>>>>>> Dear Mr. Jeff
>>>>>>
>>>>>> Thank you very much for your explanation,
>>>>>> but I am very sorry, I still do not get it,
>>>>>>
>>>>>> I made new script
>>>>>>
>>>>>> 'reinit'
>>>>>> 'open try2.ctl'
>>>>>> 'set grads off'
>>>>>> 'set mproj latlon'
>>>>>> 'set mpdset hires'
>>>>>> 'set gxout shaded'
>>>>>> 'set grid on'
>>>>>> 'set lon 100 101'
>>>>>> 'set lat -1 0'
>>>>>> 'define dx = *6.371e3*
>>>>>> *cos(-1*(3.14159/180))*cdiff(100,0)*(3.14159/180)'
>>>>>> 'define dy = *6.371e3**cdiff(-1,0)*(3.14159/180))'
>>>>>> 'define xdist = ((lon-100)/0.004492369)*(dx/2]'
>>>>>> 'define ydist = ((lat-0)/0.004522556)*dy/2]'
>>>>>> 'set z 5'
>>>>>> 'set t 1'
>>>>>> 'd ref'
>>>>>>
>>>>>> I checked grads document and I found that 6.371e3 is radius of the
>>>>>> earth (6371 to 6374 km)*.*
>>>>>> *
>>>>>> *
>>>>>> *I tried to change "*6.371e3" to "0e10" which is mean 0 to 10 km)
>>>>>> But still the program did not run normally.
>>>>>>
>>>>>> I changed the value of lon and lat in script with 100 and -1.
>>>>>> but still I got error.
>>>>>>
>>>>>> Please help me to solve it.
>>>>>>
>>>>>> Thank you very much
>>>>>> Best regards,
>>>>>> wendi
>>>>>>
>>>>>> On Sat, Feb 2, 2013 at 2:21 AM, Jeff Duda <jeffduda319 at gmail.com>wrote:
>>>>>>
>>>>>>> Wendi,
>>>>>>> You need to run those two define commands at the top of my previous
>>>>>>> email before attempting to define the xdist and ydist fields. Also, since
>>>>>>> I can see your control file information, I can see that dlon is 0.004492369
>>>>>>> and dlat is 0.004522556. So substitute those two values into your
>>>>>>> expressions for xdist and ydist also.
>>>>>>>
>>>>>>> Jeff
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Feb 1, 2013 at 4:36 AM, wendi harjupa <
>>>>>>> wendiharjupa at gmail.com> wrote:
>>>>>>>
>>>>>>>> Dear Mr. Jeff
>>>>>>>>
>>>>>>>> I have tried to use the scipt which you suggested,
>>>>>>>> But, still I could not do it. Would you help me more...
>>>>>>>>
>>>>>>>> here I send my gs file :
>>>>>>>>
>>>>>>>> 'reinit'
>>>>>>>> 'open try2.ctl'
>>>>>>>> 'set grads off'
>>>>>>>> 'set mproj latlon'
>>>>>>>> 'set mpdset hires'
>>>>>>>> 'set gxout shaded'
>>>>>>>> 'set grid on'
>>>>>>>> 'set lon 100 101'
>>>>>>>> 'set lat 0 1'
>>>>>>>> 'define xdist = [(lon 99.7)/dlon]*[dx/2]'
>>>>>>>> 'define ydist = [(lat -1.02)/dlat]*[dy/2]'
>>>>>>>> 'set z 5'
>>>>>>>> 'set t 1'
>>>>>>>> 'd ref'
>>>>>>>>
>>>>>>>> Below is my ctl file :
>>>>>>>>
>>>>>>>> DSET 1013.dat
>>>>>>>> TITLE RADAR
>>>>>>>> OPTIONS TEMPLATE LITTLE_ENDIAN
>>>>>>>> UNDEF -1000
>>>>>>>> XDEF 321 LINEAR 99.688120996 0.004492369
>>>>>>>> YDEF 321 LINEAR -1.083708891 0.004522556
>>>>>>>> ZDEF 39 LINEAR 1.0 0.5
>>>>>>>> TDEF 15 LINEAR 13:00Z10apr2004 4mn
>>>>>>>> VARS 2
>>>>>>>> ref 39 99 Reflectivity(dBZ)
>>>>>>>> vel 39 99 Doppler Velocity(m/s)
>>>>>>>> ENDVARS
>>>>>>>>
>>>>>>>>
>>>>>>>> Would you check my gs file, is there something that I have to
>>>>>>>> revise??
>>>>>>>>
>>>>>>>> Thank you very much.
>>>>>>>>
>>>>>>>> Best regards,
>>>>>>>> wendi
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Fri, Feb 1, 2013 at 10:34 AM, Jeff Duda <jeffduda319 at gmail.com>wrote:
>>>>>>>>
>>>>>>>>> These commands will help.
>>>>>>>>>
>>>>>>>>> 'define dx =
>>>>>>>>> 6.371e3*cos(lat*(3.14159/180))*cdiff(lon,x)*(3.14159/180)'
>>>>>>>>> 'define dy = 6.371e3*cdiff(lat,y)*(3.14159/180))'
>>>>>>>>>
>>>>>>>>> They define grid increments in terms of spatial distance rather
>>>>>>>>> than geographic distance. If you're trying to change the axes and tick
>>>>>>>>> marks, you'll have to define an origin and define your x and y distances
>>>>>>>>> based on that. For instance, if you set your lower left domain corner
>>>>>>>>> (latitude 0 and longitude 100), then you can define your coordinate
>>>>>>>>> distances using
>>>>>>>>>
>>>>>>>>> 'define xdist = [(lon-100)/dlon]*[dx/2]'
>>>>>>>>> 'define ydist = [(lat-0)/dlat]*[dy/2]'
>>>>>>>>>
>>>>>>>>> I think this should work, but I haven't tested it myself, so I
>>>>>>>>> don't know. dlon and dlat are the step values from the XDEF and YDEF lines
>>>>>>>>> of the control file, respectively.
>>>>>>>>>
>>>>>>>>> Jeff Duda
>>>>>>>>>
>>>>>>>>> On Thu, Jan 31, 2013 at 7:02 AM, wendi harjupa <
>>>>>>>>> wendiharjupa at gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Dear Sir/Madam
>>>>>>>>>>
>>>>>>>>>> I need help
>>>>>>>>>> I have problem with grads command,
>>>>>>>>>> I am not well understand with command gr2XY,
>>>>>>>>>>
>>>>>>>>>> Actually I want to convert the lon 100 to 101, and lat 0 to 1 to
>>>>>>>>>> distance (km)
>>>>>>>>>> let think that lon 100 is 0 km, and lat 0 is 0 km,
>>>>>>>>>>
>>>>>>>>>> what command I can use to convert lon and lat to km?
>>>>>>>>>>
>>>>>>>>>> Thank you very much for your help
>>>>>>>>>>
>>>>>>>>>> best regards,
>>>>>>>>>> --
>>>>>>>>>> -------------
>>>>>>>>>> Wendi Harjupa. ST
>>>>>>>>>> Shimane University Graduate School of Engineering Sciences
>>>>>>>>>> Department of Electronic Control Systems
>>>>>>>>>> Remote Sensing Laboratory
>>>>>>>>>> s119447
>>>>>>>>>> Cellphone : +81-080-4268-6676
>>>>>>>>>> email : wendi at rslab.riko.shimane-u.ac.jp
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> gradsusr mailing list
>>>>>>>>>> gradsusr at gradsusr.org
>>>>>>>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Jeff Duda
>>>>>>>>> Graduate research assistant
>>>>>>>>> University of Oklahoma School of Meteorology
>>>>>>>>> Center for Analysis and Prediction of Storms
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> gradsusr mailing list
>>>>>>>>> gradsusr at gradsusr.org
>>>>>>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> -------------
>>>>>>>> Wendi Harjupa. ST
>>>>>>>> Shimane University Graduate School of Engineering Sciences
>>>>>>>> Department of Electronic Control Systems
>>>>>>>> Remote Sensing Laboratory
>>>>>>>> s119447
>>>>>>>> Cellphone : +81-080-4268-6676
>>>>>>>> email : wendi at rslab.riko.shimane-u.ac.jp
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> gradsusr mailing list
>>>>>>>> gradsusr at gradsusr.org
>>>>>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Jeff Duda
>>>>>>> Graduate research assistant
>>>>>>> University of Oklahoma School of Meteorology
>>>>>>> Center for Analysis and Prediction of Storms
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> gradsusr mailing list
>>>>>>> gradsusr at gradsusr.org
>>>>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> -------------
>>>>>> Wendi Harjupa. ST
>>>>>> Shimane University Graduate School of Engineering Sciences
>>>>>> Department of Electronic Control Systems
>>>>>> Remote Sensing Laboratory
>>>>>> s119447
>>>>>> Cellphone : +81-080-4268-6676
>>>>>> email : wendi at rslab.riko.shimane-u.ac.jp
>>>>>>
>>>>>> _______________________________________________
>>>>>> gradsusr mailing list
>>>>>> gradsusr at gradsusr.org
>>>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Jeff Duda
>>>>> Graduate research assistant
>>>>> University of Oklahoma School of Meteorology
>>>>> Center for Analysis and Prediction of Storms
>>>>>
>>>>> _______________________________________________
>>>>> gradsusr mailing list
>>>>> gradsusr at gradsusr.org
>>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> -------------
>>>> Wendi Harjupa. ST
>>>> Shimane University Graduate School of Engineering Sciences
>>>> Department of Electronic Control Systems
>>>> Remote Sensing Laboratory
>>>> s119447
>>>> Cellphone : +81-080-4268-6676
>>>> email : wendi at rslab.riko.shimane-u.ac.jp
>>>>
>>>> _______________________________________________
>>>> gradsusr mailing list
>>>> gradsusr at gradsusr.org
>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>>
>>>>
>>>
>>>
>>> --
>>> Jeff Duda
>>> Graduate research assistant
>>> University of Oklahoma School of Meteorology
>>> Center for Analysis and Prediction of Storms
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
>>
>> --
>> -------------
>> Wendi Harjupa. ST
>> Shimane University Graduate School of Engineering Sciences
>> Department of Electronic Control Systems
>> Remote Sensing Laboratory
>> s119447
>> Cellphone : +81-080-4268-6676
>> email : wendi at rslab.riko.shimane-u.ac.jp
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
>
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>
--
-------------
Wendi Harjupa. ST
Shimane University Graduate School of Engineering Sciences
Department of Electronic Control Systems
Remote Sensing Laboratory
s119447
Cellphone : +81-080-4268-6676
email : wendi at rslab.riko.shimane-u.ac.jp
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