Re: Pixelated, Regional Topograpy Data

Yes, as Walter mentioned, the SRTM 3-arcsecond (~90 m) digital topography
is available for most of the Earth (up to 60 degrees N & S latitudes), and
it is much higher resolution than the ETOPO1 data that is 1-arcminute or
about 2 km spacing. The latest release is SRTM version 3.0. The Open
Topography website has a new service that will assemble the data and
provide the output in three formats
(http://www.opentopography.org/index.php/news/detail/srtm_version_30_global
_90m_and_united_states_30m_elevation_data_now_availab/). The GeoTIFF files
are easy to convert to GMT .grd files with GDAL.

++Eric Fielding


-----Original Message-----
From: "Walter  Smith  (HF)" <[email protected]>
Reply-To: World-Wide GMT Usage and Help Mailing List
<[email protected]>
Date: Saturday, August 9, 2014 11:04 AM
To: "[email protected]" <[email protected]>
Subject: Re: [GMT-HELP] Pixelated, Regional Topograpy Data

>=B3pscoast=B2 is defaulting to a low resolution coastline. Try adding -Df =
or
>check the usage message to get your highest option.
>
>There is higher resolution topography than ETOPO1, such as SRTM3. You=B9ll
>have to search around and you may have to assemble it from a few tiles
>that you may have to download separately.
>
>Walter
>
>On Aug 9, 2014, at 1:50 PM, Gregory (Greg) Brenn <[email protected]>
>wrote:
>
>> Hello,
>>=20
>> New user of GMT here, and I'm attempting to create a map of Costa Rica
>>and overlay coastlines and earthquake locations.  Here is my Script:
>>=20
>> #!/bin/bash
>>=20
>> clear
>>=20
>> xyz2grd COSTARIC-6565.xyz -Gcostarica.grd -R-87/-84/9/11 -I2m -V
>>=20
>> grdimage costarica.grd -JM12 -K -Cmy-topo.cpt -R-87/-84/9/11 >> map.ps
>>=20
>> pscoast -V -O -K -JM -R -W1 >> mappy.ps
>>=20
>> psxy loc.txt -JM12 -R-87/-84/9/11 -Sc.1 -G'45/59/100' -B1/1 -O >> map.ps
>> gv map.ps
>>=20
>>=20
>>=20
>> I am using a generic color palette which I can change easily, but the
>>coastlines are extremely low quality, and the topography is extremely
>>pixelated.=20
>>=20
>> I look at images in papers, and there's extremely high quality
>>topographic images of COsta Rica, for example, as well as the coastlines
>>and bathymetry, but I have no idea where I can get this high-quality
>>data.  I have tried to get ETOPO data, but I cannot seem to find where
>>to get high-quality data.
>>=20
>> So I guess my question is, is ETOPO1 the best place to get high-quality
>>topo data, because I cannot seem to figure out how to download data from
>>their website.  Also, would I need to download coastline data, as well?
>>=20
>>=20
>>=20
>> Thanks,
>>=20
>> Greg
>>=20
>> Mailing list for GMT discussions of all kinds. If you are not sure you
>>have found a bug, discuss it here first. To formally report bugs or
>>request features, please register and add New Issue on
>>gmt.soest.hawaii.edu To unsubscribe, send the message "signoff gmt-help"
>>to [email protected] Note: gmt-help will become obsolete on Sept
>>1, 2014 - please use forum on gmt.soest.hawaii.edu instead.
>
>Mailing list for GMT discussions of all kinds.  If you are not sure you
>have found a bug, discuss it here first.
>To formally report bugs or request features, please register and add New
>Issue on gmt.soest.hawaii.edu
>To unsubscribe, send the message "signoff gmt-help" to
>[email protected]
>Note: gmt-help will become obsolete on Sept 1, 2014 - please use forum on
>gmt.soest.hawaii.edu instead.

Mailing list for GMT discussions of all kinds.  If you are not sure you have found a bug, discuss it here first.
To formally report bugs or request features, please register and add New Issue on gmt.soest.hawaii.edu
To unsubscribe, send the message "signoff gmt-help" to [email protected]
Note: gmt-help will become obsolete on Sept 1, 2014 - please use forum on gmt.soest.hawaii.edu instead.