[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

20050315: NEXRAD data transformation (cont.)



>From: address@hidden
>Organization: GMU
>Keywords: 200503110302.j2B32Tv2006037 McIDAS FNEXRAD composite

Hi Ying,

>Thanks Tom! It is working, just too black to notice: the stain I thought is
>actually the data, ;P
>
>Is it difficult to set the color scale?

In McIDAS, no.  I would suggest using different enhancement tables
when looking at the different NEXRAD Level III or FNEXRAD composite
products.

Try these examples displays of FNEXRAD composites in a McIDAS session:

FNEXRAD 1km N0R National composite:
ERASE;IMGDISP NEXRCOMP/1KN0R-NAT MAG=-5 -5 EU=BREF24; MAP H

FNEXRAD 2km N1P National composite:
ERASE;IMGDISP NEXRCOMP/2KN1P-NAT MAG=-3 -3 EU=PRE1; MAP H

FNEXRAD 4km NTP National composite:
ERASE;IMGDISP NEXRCOMP/4KNTP-NAT MAG=-2 -2 EU=PRET; MAP H

Remember that the colorization of a display does not change data values
in the image.  Image data values are values that range from 0 to 255 in
1-byte images, 0 to 1024 in 2-byte images, etc.

So, when you convert an image into GeoTIFF format, the data values will
be the same as they were in the original image: values that range from
zero (black) to 255 (white).  Since I am not familiar with GIS systems
(presumably what you are using to look at the GeoTIFF output), I can
not advise you on how to color (enhance) those displays.

Cheers,

Tom
--
NOTE: All email exchanges with Unidata User Support are recorded in the
Unidata inquiry tracking system and then made publicly available
through the web.  If you do not want to have your interactions made
available in this way, you must let us know in each email you send to us.


NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.