[GRASS-user] Earthquake PHP map - was: Re: Geocentric Datum of Australia 1994

GRASS GRASS user
1

On Fri, Jul 17, 2009 at 6:59 AM, Hamish<hamish_b@yahoo.com> wrote:

ps- (OT) http://grass.itc.it/spearfish/php_grass_earthquakes.php
low priority wishes:
- how to brighten the Blue Marble colormap (RGB raster)? i.landsat.rgb?

It is running in GRASS 6.1 (yes!), so no i.landsat.rgb... I could rip out
the relevant parts from the script and try.

- Richter scale is logarithmic, but bubble radius is linear classed
to int order of magnitude- the whoppers get hidden in the noise.

Uhm, good point. Solutions welcome (ideally a d.vect.thematic patch,
maybe a flag?)

Markus

2

Hamish:

> http://grass.itc.it/spearfish/php_grass_earthquakes.php
> low priority wishes:
> - how to brighten the Blue Marble colormap (RGB raster)?
> i.landsat.rgb?

It is running in GRASS 6.1 (yes!), so no i.landsat.rgb... I
could rip out the relevant parts from the script and try.

ok, or from a newer version of GRASS generate a color map then
drop it over the Blue Marble map's colr/ file.

I've just tried i.landsat.rgb with the Blue Marble 2002 (no bathy),
it makes the Sahara-Gobi quite contrasty.

So i.landsat.rgb is good at adjusting pseudo-contrast. A method to
adjust pseudo-brightness is:

g.region res=1
r.mapcalc "one = 1"
g.region res=0:10
r.composite r=BlueMarble2002.red g=BlueMarble2002.green \
   b=BlueMarble2002.blue out=BlueMarble2002_10min.rgb
d.shadedmap drape=BlueMarble2002_10min.rgb relief=one bright=25

Sahara-Gobi still glow too brightly, some experimentation might be
needed to find a compromise?
(tip: set resolution very coarse during trial and error for speed)

also a gee-whiz wish would be to use the Blue Marble NextGen image of
the current month instead of hardcoded May. :slight_smile:

> Richter scale is logarithmic, but bubble radius is linear classed
> to int order of magnitude- the whoppers get hidden in the noise.

Uhm, good point. Solutions welcome (ideally a d.vect.thematic patch,
maybe a flag?)

I had hoped to add a new size_column= option to d.vect when I found some
time or the need became pressing, maybe it would help too.
  https://trac.osgeo.org/grass/ticket/600

Hamish