[GRASS-user] Accentuating/adding topography to a raster image?

GRASS GRASS user
1

We're trying to add in a bit of topographic shading/illumination into an
image, and I was hoping to get some feedback on what algorithms work the
best? I tried a hillshade approach in ENVI, was pretty unimpressed with it.
Any suggestions for a GRASS approach? Run r.sun and do some sort of pixel
weighting?

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

2

Hi,

I use this approach:

d.his h=your_map i=aspect

or

d.his h=your_map i=r_shaded_relief

or run nviz and set the light source :wink:

jachym

On Sat, Aug 12, 2006 at 02:45:22AM -0700, Jonathan Greenberg wrote:

We're trying to add in a bit of topographic shading/illumination into an
image, and I was hoping to get some feedback on what algorithms work the
best? I tried a hillshade approach in ENVI, was pretty unimpressed with it.
Any suggestions for a GRASS approach? Run r.sun and do some sort of pixel
weighting?

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507

3

Jonathan Greenberg napisa?(a):

We're trying to add in a bit of topographic shading/illumination into an
image, and I was hoping to get some feedback on what algorithms work the
best? I tried a hillshade approach in ENVI, was pretty unimpressed with it.
Any suggestions for a GRASS approach?

r.shaded.relief ?

Maciek

4

This is also automatically done in the GUI. Just put your shaded relief map
into the basemap field and your image into the drape map field.

Display and presto, you have a topographically shaded image.

You can also do this in nviz for an even more dramatic effect. Use a DEM
(not shaded relief) as a basemap/elevation map and use your image as a color
map for the topography.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

From: Jachym Cepicky <jachym.cepicky@centrum.cz>
Date: Sat, 12 Aug 2006 12:27:33 +0200
To: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
Cc: 'GRASS user list' <grassuser@grass.itc.it>
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?

Hi,

I use this approach:

d.his h=your_map i=aspect

or

d.his h=your_map i=r_shaded_relief

or run nviz and set the light source :wink:

jachym

On Sat, Aug 12, 2006 at 02:45:22AM -0700, Jonathan Greenberg wrote:

We're trying to add in a bit of topographic shading/illumination into an
image, and I was hoping to get some feedback on what algorithms work the
best? I tried a hillshade approach in ENVI, was pretty unimpressed with it.
Any suggestions for a GRASS approach? Run r.sun and do some sort of pixel
weighting?

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507

5

My main problem is the dem and image are both about 1.5 gb each -- am I
likely to run into problems with this?

Never played with nviz before, looks like I'll be trying it out tonight!

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

-----Original Message-----
From: Michael Barton [mailto:michael.barton@asu.edu]
Sent: Saturday, August 12, 2006 10:54 AM
To: Jachym Cepicky; Jonathan Greenberg
Cc: 'GRASS user list'
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?

This is also automatically done in the GUI. Just put your shaded relief map
into the basemap field and your image into the drape map field.

Display and presto, you have a topographically shaded image.

You can also do this in nviz for an even more dramatic effect. Use a DEM
(not shaded relief) as a basemap/elevation map and use your image as a color
map for the topography.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

From: Jachym Cepicky <jachym.cepicky@centrum.cz>
Date: Sat, 12 Aug 2006 12:27:33 +0200
To: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
Cc: 'GRASS user list' <grassuser@grass.itc.it>
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster

image?

Hi,

I use this approach:

d.his h=your_map i=aspect

or

d.his h=your_map i=r_shaded_relief

or run nviz and set the light source :wink:

jachym

On Sat, Aug 12, 2006 at 02:45:22AM -0700, Jonathan Greenberg wrote:

We're trying to add in a bit of topographic shading/illumination into an
image, and I was hoping to get some feedback on what algorithms work the
best? I tried a hillshade approach in ENVI, was pretty unimpressed with

it.

Any suggestions for a GRASS approach? Run r.sun and do some sort of

pixel

weighting?

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507

6

what about resample your resolution?

    g.region res=*MORE*

result could be still printable, but it would not be so big

jachym

On Sat, Aug 12, 2006 at 11:00:28AM -0700, Jonathan Greenberg wrote:

My main problem is the dem and image are both about 1.5 gb each -- am I
likely to run into problems with this?

Never played with nviz before, looks like I'll be trying it out tonight!

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

-----Original Message-----
From: Michael Barton [mailto:michael.barton@asu.edu]
Sent: Saturday, August 12, 2006 10:54 AM
To: Jachym Cepicky; Jonathan Greenberg
Cc: 'GRASS user list'
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?

This is also automatically done in the GUI. Just put your shaded relief map
into the basemap field and your image into the drape map field.

Display and presto, you have a topographically shaded image.

You can also do this in nviz for an even more dramatic effect. Use a DEM
(not shaded relief) as a basemap/elevation map and use your image as a color
map for the topography.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

> From: Jachym Cepicky <jachym.cepicky@centrum.cz>
> Date: Sat, 12 Aug 2006 12:27:33 +0200
> To: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
> Cc: 'GRASS user list' <grassuser@grass.itc.it>
> Subject: Re: [GRASS-user] Accentuating/adding topography to a raster
image?
>
> Hi,
>
> I use this approach:
>
> d.his h=your_map i=aspect
>
> or
>
> d.his h=your_map i=r_shaded_relief
>
> or run nviz and set the light source :wink:
>
> jachym
>
>
> On Sat, Aug 12, 2006 at 02:45:22AM -0700, Jonathan Greenberg wrote:
>> We're trying to add in a bit of topographic shading/illumination into an
>> image, and I was hoping to get some feedback on what algorithms work the
>> best? I tried a hillshade approach in ENVI, was pretty unimpressed with
it.
>> Any suggestions for a GRASS approach? Run r.sun and do some sort of
pixel
>> weighting?
>>
>> --j
>>
>> --
>>
>> Jonathan A. Greenberg, PhD
>> NASA Postdoctoral Researcher
>> NASA Ames Research Center
>> MS 242-4
>> Moffett Field, CA 94035-1000
>> Phone: 415-794-5043
>> AIM: jgrn3007
>> MSN: jgrn3007@hotmail.com
>>
>>
>>
>> _______________________________________________
>> grassuser mailing list
>> grassuser@grass.itc.it
>> http://grass.itc.it/mailman/listinfo/grassuser
>
> --
> Jachym Cepicky
> e-mail: jachym.cepicky@centrum.cz
> URL: http://les-ejk.cz
> GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
> -----------------------------------------
> OFFICE:
> GDF-Hannover
> Mengendamm 16d
> 30177 Hannover
> Germany
> e-mail: cepicky@gdf-hannover.de
> URL: http://gdf-hannover.de
> Tel.: +49 511-39088507

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507

7

We are printing this out for a 9 foot by 5 foot wall installation, so we
need to keep the resolution (as it stands it will output about a 130 dpi,
the range for the printer is 100 to 200 dpi).

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

-----Original Message-----
From: Jachym Cepicky [mailto:jachym.cepicky@centrum.cz]
Sent: Saturday, August 12, 2006 11:13 AM
To: Jonathan Greenberg
Cc: 'GRASS user list'
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?

what about resample your resolution?

    g.region res=*MORE*

result could be still printable, but it would not be so big

jachym

On Sat, Aug 12, 2006 at 11:00:28AM -0700, Jonathan Greenberg wrote:

My main problem is the dem and image are both about 1.5 gb each -- am I
likely to run into problems with this?

Never played with nviz before, looks like I'll be trying it out tonight!

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

-----Original Message-----
From: Michael Barton [mailto:michael.barton@asu.edu]
Sent: Saturday, August 12, 2006 10:54 AM
To: Jachym Cepicky; Jonathan Greenberg
Cc: 'GRASS user list'
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster

image?

This is also automatically done in the GUI. Just put your shaded relief

map

into the basemap field and your image into the drape map field.

Display and presto, you have a topographically shaded image.

You can also do this in nviz for an even more dramatic effect. Use a DEM
(not shaded relief) as a basemap/elevation map and use your image as a

color

map for the topography.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

> From: Jachym Cepicky <jachym.cepicky@centrum.cz>
> Date: Sat, 12 Aug 2006 12:27:33 +0200
> To: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
> Cc: 'GRASS user list' <grassuser@grass.itc.it>
> Subject: Re: [GRASS-user] Accentuating/adding topography to a raster
image?
>
> Hi,
>
> I use this approach:
>
> d.his h=your_map i=aspect
>
> or
>
> d.his h=your_map i=r_shaded_relief
>
> or run nviz and set the light source :wink:
>
> jachym
>
>
> On Sat, Aug 12, 2006 at 02:45:22AM -0700, Jonathan Greenberg wrote:
>> We're trying to add in a bit of topographic shading/illumination into

an

>> image, and I was hoping to get some feedback on what algorithms work

the

>> best? I tried a hillshade approach in ENVI, was pretty unimpressed

with

it.
>> Any suggestions for a GRASS approach? Run r.sun and do some sort of
pixel
>> weighting?
>>
>> --j
>>
>> --
>>
>> Jonathan A. Greenberg, PhD
>> NASA Postdoctoral Researcher
>> NASA Ames Research Center
>> MS 242-4
>> Moffett Field, CA 94035-1000
>> Phone: 415-794-5043
>> AIM: jgrn3007
>> MSN: jgrn3007@hotmail.com
>>
>>
>>
>> _______________________________________________
>> grassuser mailing list
>> grassuser@grass.itc.it
>> http://grass.itc.it/mailman/listinfo/grassuser
>
> --
> Jachym Cepicky
> e-mail: jachym.cepicky@centrum.cz
> URL: http://les-ejk.cz
> GPG:

http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc

> -----------------------------------------
> OFFICE:
> GDF-Hannover
> Mengendamm 16d
> 30177 Hannover
> Germany
> e-mail: cepicky@gdf-hannover.de
> URL: http://gdf-hannover.de
> Tel.: +49 511-39088507

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507

8

DEFINITELY drop your resolution before running nviz (or even making a shaded
relief map) unless you want to take all night to display stuff. This will
have a much bigger effect than the size of the image per se.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

From: Jachym Cepicky <jachym.cepicky@centrum.cz>
Date: Sat, 12 Aug 2006 20:12:48 +0200
To: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
Cc: 'GRASS user list' <grassuser@grass.itc.it>
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?

what about resample your resolution?

    g.region res=*MORE*

result could be still printable, but it would not be so big

jachym

On Sat, Aug 12, 2006 at 11:00:28AM -0700, Jonathan Greenberg wrote:

My main problem is the dem and image are both about 1.5 gb each -- am I
likely to run into problems with this?

Never played with nviz before, looks like I'll be trying it out tonight!

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

-----Original Message-----
From: Michael Barton [mailto:michael.barton@asu.edu]
Sent: Saturday, August 12, 2006 10:54 AM
To: Jachym Cepicky; Jonathan Greenberg
Cc: 'GRASS user list'
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?

This is also automatically done in the GUI. Just put your shaded relief map
into the basemap field and your image into the drape map field.

Display and presto, you have a topographically shaded image.

You can also do this in nviz for an even more dramatic effect. Use a DEM
(not shaded relief) as a basemap/elevation map and use your image as a color
map for the topography.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

From: Jachym Cepicky <jachym.cepicky@centrum.cz>
Date: Sat, 12 Aug 2006 12:27:33 +0200
To: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
Cc: 'GRASS user list' <grassuser@grass.itc.it>
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster

image?

Hi,

I use this approach:

d.his h=your_map i=aspect

or

d.his h=your_map i=r_shaded_relief

or run nviz and set the light source :wink:

jachym

On Sat, Aug 12, 2006 at 02:45:22AM -0700, Jonathan Greenberg wrote:

We're trying to add in a bit of topographic shading/illumination into an
image, and I was hoping to get some feedback on what algorithms work the
best? I tried a hillshade approach in ENVI, was pretty unimpressed with

it.

Any suggestions for a GRASS approach? Run r.sun and do some sort of

pixel

weighting?

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507

9

Hi Jonathan, others,

I have done somehting similar for very large datasets: i.e. a 30m DEM
for CA, then AZ, and then finally NV.

Here is what I did, all without memory problems: all sizes are approx.

1. patch together my DEM data (2.5 Gb)
2. compute shaded rel. via r.shaded.relief (1.5Gb)
3. patch 30m landsat tiles and create *nice* color composites 4x (1.5Gb)
4. blend shaded relief and landsat composite 3x (2gb)
5. re-composite blened output channels (4Gb)
6. tile resulting raster for speedy access via mapserver

do this for each state...

a quick example can be seen here:

http://casoilresource.lawr.ucdavis.edu/drupal/node/253?size=_original

or on the actual online soil survey itself:
http://casoilresource.lawr.ucdavis.edu/drupal/node/27

note that CA and NV look the best, still working on re-doing AZ with
the i.landsat.rgb module:
http://casoilresource.lawr.ucdavis.edu/drupal/node/159

the actual computations tool several hours, so i would leave the
machine to do its work overnight, usually to find the output the next
morning. I would estimate at least 2 days of computer time (2x Xeon
2.8 GHz) for something this size.

hope that is helpful,

Dylan

On 8/12/06, Michael Barton <michael.barton@asu.edu> wrote:

DEFINITELY drop your resolution before running nviz (or even making a shaded
relief map) unless you want to take all night to display stuff. This will
have a much bigger effect than the size of the image per se.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

> From: Jachym Cepicky <jachym.cepicky@centrum.cz>
> Date: Sat, 12 Aug 2006 20:12:48 +0200
> To: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
> Cc: 'GRASS user list' <grassuser@grass.itc.it>
> Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?
>
> what about resample your resolution?
>
> g.region res=*MORE*
>
> result could be still printable, but it would not be so big
>
> jachym
>
> On Sat, Aug 12, 2006 at 11:00:28AM -0700, Jonathan Greenberg wrote:
>> My main problem is the dem and image are both about 1.5 gb each -- am I
>> likely to run into problems with this?
>>
>> Never played with nviz before, looks like I'll be trying it out tonight!
>>
>> --j
>>
>> --
>>
>> Jonathan A. Greenberg, PhD
>> NASA Postdoctoral Researcher
>> NASA Ames Research Center
>> MS 242-4
>> Moffett Field, CA 94035-1000
>> Phone: 415-794-5043
>> AIM: jgrn3007
>> MSN: jgrn3007@hotmail.com
>>
>> -----Original Message-----
>> From: Michael Barton [mailto:michael.barton@asu.edu]
>> Sent: Saturday, August 12, 2006 10:54 AM
>> To: Jachym Cepicky; Jonathan Greenberg
>> Cc: 'GRASS user list'
>> Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?
>>
>> This is also automatically done in the GUI. Just put your shaded relief map
>> into the basemap field and your image into the drape map field.
>>
>> Display and presto, you have a topographically shaded image.
>>
>> You can also do this in nviz for an even more dramatic effect. Use a DEM
>> (not shaded relief) as a basemap/elevation map and use your image as a color
>> map for the topography.
>>
>> Michael
>> __________________________________________
>> Michael Barton, Professor of Anthropology
>> School of Human Evolution & Social Change
>> Center for Social Dynamics & Complexity
>> Arizona State University
>>
>> phone: 480-965-6213
>> fax: 480-965-7671
>> www: http://www.public.asu.edu/~cmbarton
>>
>>> From: Jachym Cepicky <jachym.cepicky@centrum.cz>
>>> Date: Sat, 12 Aug 2006 12:27:33 +0200
>>> To: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
>>> Cc: 'GRASS user list' <grassuser@grass.itc.it>
>>> Subject: Re: [GRASS-user] Accentuating/adding topography to a raster
>> image?
>>>
>>> Hi,
>>>
>>> I use this approach:
>>>
>>> d.his h=your_map i=aspect
>>>
>>> or
>>>
>>> d.his h=your_map i=r_shaded_relief
>>>
>>> or run nviz and set the light source :wink:
>>>
>>> jachym
>>>
>>> On Sat, Aug 12, 2006 at 02:45:22AM -0700, Jonathan Greenberg wrote:
>>>> We're trying to add in a bit of topographic shading/illumination into an
>>>> image, and I was hoping to get some feedback on what algorithms work the
>>>> best? I tried a hillshade approach in ENVI, was pretty unimpressed with
>> it.
>>>> Any suggestions for a GRASS approach? Run r.sun and do some sort of
>> pixel
>>>> weighting?
>>>>
>>>> --j
>>>>
>>>> --
>>>>
>>>> Jonathan A. Greenberg, PhD
>>>> NASA Postdoctoral Researcher
>>>> NASA Ames Research Center
>>>> MS 242-4
>>>> Moffett Field, CA 94035-1000
>>>> Phone: 415-794-5043
>>>> AIM: jgrn3007
>>>> MSN: jgrn3007@hotmail.com
>>>>
>>>> _______________________________________________
>>>> grassuser mailing list
>>>> grassuser@grass.itc.it
>>>> http://grass.itc.it/mailman/listinfo/grassuser
>>>
>>> --
>>> Jachym Cepicky
>>> e-mail: jachym.cepicky@centrum.cz
>>> URL: http://les-ejk.cz
>>> GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
>>> -----------------------------------------
>>> OFFICE:
>>> GDF-Hannover
>>> Mengendamm 16d
>>> 30177 Hannover
>>> Germany
>>> e-mail: cepicky@gdf-hannover.de
>>> URL: http://gdf-hannover.de
>>> Tel.: +49 511-39088507
>>
>> _______________________________________________
>> grassuser mailing list
>> grassuser@grass.itc.it
>> http://grass.itc.it/mailman/listinfo/grassuser
>
> --
> Jachym Cepicky
> e-mail: jachym.cepicky@centrum.cz
> URL: http://les-ejk.cz
> GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
> -----------------------------------------
> OFFICE:
> GDF-Hannover
> Mengendamm 16d
> 30177 Hannover
> Germany
> e-mail: cepicky@gdf-hannover.de
> URL: http://gdf-hannover.de
> Tel.: +49 511-39088507

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

10

The resolution of the region will have no effect on the resolution of the
screen for graphic output from GRASS, unless the region resolution (i.e.,
columns and rows) is less than the width and height of the screen in pixels.
If you are exporting this map (e.g., to a tif), then the resolution of the
region will have an effect on the resolution of the export.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

From: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
Date: Sat, 12 Aug 2006 11:17:07 -0700
To: 'Jachym Cepicky' <jachym.cepicky@centrum.cz>
Cc: 'GRASS user list' <grassuser@grass.itc.it>
Subject: RE: [GRASS-user] Accentuating/adding topography to a raster image?

We are printing this out for a 9 foot by 5 foot wall installation, so we
need to keep the resolution (as it stands it will output about a 130 dpi,
the range for the printer is 100 to 200 dpi).

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

-----Original Message-----
From: Jachym Cepicky [mailto:jachym.cepicky@centrum.cz]
Sent: Saturday, August 12, 2006 11:13 AM
To: Jonathan Greenberg
Cc: 'GRASS user list'
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?

what about resample your resolution?

    g.region res=*MORE*

result could be still printable, but it would not be so big

jachym

On Sat, Aug 12, 2006 at 11:00:28AM -0700, Jonathan Greenberg wrote:

My main problem is the dem and image are both about 1.5 gb each -- am I
likely to run into problems with this?

Never played with nviz before, looks like I'll be trying it out tonight!

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

-----Original Message-----
From: Michael Barton [mailto:michael.barton@asu.edu]
Sent: Saturday, August 12, 2006 10:54 AM
To: Jachym Cepicky; Jonathan Greenberg
Cc: 'GRASS user list'
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster

image?

This is also automatically done in the GUI. Just put your shaded relief

map

into the basemap field and your image into the drape map field.

Display and presto, you have a topographically shaded image.

You can also do this in nviz for an even more dramatic effect. Use a DEM
(not shaded relief) as a basemap/elevation map and use your image as a

color

map for the topography.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

From: Jachym Cepicky <jachym.cepicky@centrum.cz>
Date: Sat, 12 Aug 2006 12:27:33 +0200
To: Jonathan Greenberg <jgreenberg@arc.nasa.gov>
Cc: 'GRASS user list' <grassuser@grass.itc.it>
Subject: Re: [GRASS-user] Accentuating/adding topography to a raster

image?

Hi,

I use this approach:

d.his h=your_map i=aspect

or

d.his h=your_map i=r_shaded_relief

or run nviz and set the light source :wink:

jachym

On Sat, Aug 12, 2006 at 02:45:22AM -0700, Jonathan Greenberg wrote:

We're trying to add in a bit of topographic shading/illumination into

an

image, and I was hoping to get some feedback on what algorithms work

the

best? I tried a hillshade approach in ENVI, was pretty unimpressed

with

it.

Any suggestions for a GRASS approach? Run r.sun and do some sort of

pixel

weighting?

--j

--

Jonathan A. Greenberg, PhD
NASA Postdoctoral Researcher
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
Phone: 415-794-5043
AIM: jgrn3007
MSN: jgrn3007@hotmail.com

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG:

http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc

-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507

_______________________________________________
grassuser mailing list
grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507