[GRASS-user] v.colors: proper command syntax

GRASS GRASS user
1

   The stations (vector, point) table has 10 columns:
  site_nbr | character varying(8)
  site_name | character varying(64)
  lon | numeric(12,6)
  lat | numeric(10,6)
  easting | numeric
  northing | numeric
  start_date | date
  end_date | date
  howmany | integer
  bin_col | character(8)

   I don't know which column to specify in the command,
v.colors map=stations use=attr column=bin_col
does not work.

column is the name of column containing numeric data and color is the name of color
table. But I don't want or need a color table because the column 'bin_col'
has colors for specified ranges of the howmany column in hex rgb format
(e.g., #73E700). If the command will display the map with points colored
according to bin_col please show me the proper syntax.

   If v.colors is not the appropriate module for me to display this map with
points colored using the bin_col value, please point me to the proper
module.

TIA,

Rich

2
···

On 11/2/18 11:09 PM, Rich Shepard wrote:

The stations (vector, point) table has 10 columns:
site_nbr | character varying(8)
site_name | character varying(64)
lon | numeric(12,6)
lat | numeric(10,6)
easting | numeric
northing | numeric
start_date | date
end_date | date
howmany | integer
bin_col | character(8)

I don’t know which column to specify in the command,
v.colors map=stations use=attr column=bin_col
does not work.

column is the name of column containing numeric data and color is the name of color
table. But I don’t want or need a color table because the column ‘bin_col’
has colors for specified ranges of the howmany column in hex rgb format
(e.g., #73E700). If the command will display the map with points colored
according to bin_col please show me the proper syntax.

If you want to avoid a color table then specifiy an additional column “rgb_column=” which gives the colors in decimal RGB format such as “255:0:0” for red for example.

If v.colors is not the appropriate module for me to display this map with
points colored using the bin_col value, please point me to the proper
module.

TIA,

Rich

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grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

-- 
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
3

On Sat, 3 Nov 2018, Micha Silver wrote:

If you want to avoid a color table then specifiy an additional column
"rgb_column=" which gives the colors in decimal RGB format such as
"255:0:0" for red for example.

Micha,

   I didn't know whether grass cared about the numeric format. I'll lookup
the hex code to decimal code and change then in the same column (a simple
update statement).

   Still for me to learn is the relation between v.colors and d.vect.
Trial-and-error learning, I suppose.

Thanks,

Rich

4
···

On 11/3/18 2:38 PM, Rich Shepard wrote:

On Sat, 3 Nov 2018, Micha Silver wrote:

If you want to avoid a color table then specifiy an additional column
“rgb_column=” which gives the colors in decimal RGB format such as
“255:0:0” for red for example.

Micha,

I didn’t know whether grass cared about the numeric format. I’ll lookup
the hex code to decimal code and change then in the same column (a simple
update statement).

Something like this might help:

printf “%d\n” 0xff

255

You’ll have to split the hex string into the 3 color components, of course.

Still for me to learn is the relation between v.colors and d.vect.
Trial-and-error learning, I suppose.

Thanks,

Rich

grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

-- 
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
5

On Sat, 3 Nov 2018, Micha Silver wrote:

Something like this might help:

Micha,

   Found an online converter that did the job.

Thanks,

Rich