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
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@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
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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
On Sun, Jun 14, 2015 at 2:56 AM, José Anderson <joseandersonbatista@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@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
–
José,
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@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@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@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@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
–