[GRASS-user] Are RADAR GIFs raster?

[Thomas Adams]

José <https://plus.google.com/u/0/109748848159632478544?prsrc=4>,

I'm very familiar with these data and how they are produced. I think by
doing what you are doing, you are only getting color values of the data;
so, unless you're interested -only- in pretty pictures of radar
*reflectivity*, this is useless. You should go here:

http://water.weather.gov/precip/

to get precipitation data and click on the 'Download' tab which will get
you here:

http://water.weather.gov/precip/download.php

The data downloads as shapefiles, so you'll have to do some spatial
interpolation. This data has been quality control much better than what you
could get through the link you were using.

Tom

On Sun, Jun 14, 2015 at 1:22 PM, José Anderson <
joseandersonbatista at gmail.com> wrote:

> Thomas,
>
> here is an example.
>
> http://radar.weather.gov/ridge/Conus/index_loop.php
>
> Choose a Mosaic Sector.
>
> Next, pick a State and a RADAR location (left side menu).
>
> Unmark other layers than the RADAR images.
>
> Then you can download the image by right-clicking on it.
>
> Thank you very much
>
> Jose
>
> Em dom, 14 de jun de 2015 06:33, Thomas Adams <tea3rd at gmail.com> escreveu:
>
>> José,
>>
>> It would be helpful if you could provide a link to the data you are
>> downloading for me and others to give
>> you an informed response. You could simply be looking at color values, or
>> they could be radar reflectivity
>> values (dBZ), or precipitation amounts, or wind velocities — not to
>> mention what the units of the data. This
>> would come from the metadata of the data you are using.
>>
>> More information is needed.
>>
>> Tom
>>
>> On Sun, Jun 14, 2015 at 2:56 AM, José Anderson <
>> joseandersonbatista at gmail.com> wrote:
>>
>>> Hello everyone,
>>>
>>> I georefered several RADAR GIF from a desired storm in my research and
>>> realized there are some numbers set as an attribute in the pixels, beside
>>> the pixel RGB color.
>>>
>>> I found GIF generally is an option to export original CAPPI and PPI
>>> RADAR images.
>>>
>>> Such original RADAR images contains Unsigned Character Values set to the
>>> pixels.
>>>
>>> So I'm wondering what that GIF pixel attribute values could mean.
>>>
>>> I'd appriciate any kind of answer
>>>
>>> Jose
>>>
>>> _______________________________________________
>>> grass-user mailing list
>>> grass-user at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/grass-user
>>>
>>
>>
>>
>> --
>>
>>
>>


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