Re: Pixelated, Regional Topograpy Data
"Gregory (Greg) Brenn" <[email protected]> Sat, 9 Aug 2014 16:13:57 -0400
| Newsgroups | gmane.comp.gis.gmt.user |
|---|---|
| Message-ID | <CAP5suEUy6o_H2HcnfP_Vc9cn=PLrJUDYk2L7ZpAmJ1CkAYY2ZQ@mail.gmail.com> |
--089e0149cf9438b275050037f61d Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Ok, That's great. I downloaded an unzipped .hgt files, so what do you think would be the best way to convert the .hgt files (I have 4 that I want to convert) into .grd files, then stich those files together? Could I use xyz2grd and then use grdpaste? Thanks a lot for your help. Greg On Sat, Aug 9, 2014 at 2:44 PM, Fielding, Eric J (329A) < [email protected]> wrote: > 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), an= d > 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_globa= l > _90m_and_united_states_30m_elevation_data_now_availab/). The GeoTIFF file= s > 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 > > >=C2=B3pscoast=C2=B2 is defaulting to a low resolution coastline. Try add= ing -Df or > >check the usage message to get your highest option. > > > >There is higher resolution topography than ETOPO1, such as SRTM3. You=C2= =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, > >> > >> 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: > >> > >> #!/bin/bash > >> > >> clear > >> > >> xyz2grd COSTARIC-6565.xyz -Gcostarica.grd -R-87/-84/9/11 -I2m -V > >> > >> grdimage costarica.grd -JM12 -K -Cmy-topo.cpt -R-87/-84/9/11 >> map.ps > >> > >> pscoast -V -O -K -JM -R -W1 >> mappy.ps > >> > >> psxy loc.txt -JM12 -R-87/-84/9/11 -Sc.1 -G'45/59/100' -B1/1 -O >> > map.ps > >> gv map.ps > >> > >> > >> > >> 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. > >> > >> I look at images in papers, and there's extremely high quality > >>topographic images of COsta Rica, for example, as well as the coastline= s > >>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. > >> > >> So I guess my question is, is ETOPO1 the best place to get high-qualit= y > >>topo data, because I cannot seem to figure out how to download data fro= m > >>their website. Also, would I need to download coastline data, as well? > >> > >> > >> > >> Thanks, > >> > >> Greg > >> > >> 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 Sep= t > >>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 o= n > >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. --089e0149cf9438b275050037f61d Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Ok,<div><br></div><div>That's great. =C2=A0I downloade= d an unzipped .hgt files, so what do you think would be the best way to con= vert the .hgt files (I have 4 that I want to convert) into .grd files, then= stich those files together? =C2=A0Could I use xyz2grd and then use grdpast= e?</div> <div><br></div><div>Thanks a lot for your help.</div><div>Greg</div></div><= div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Sat, Aug 9,= 2014 at 2:44 PM, Fielding, Eric J (329A) <span dir=3D"ltr"><<a href=3D"= mailto:[email protected]" target=3D"_blank">eric.j.fielding@jpl.= nasa.gov</a>></span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex">Yes, as Walter mentioned, the SRTM 3-arcseco= nd (~90 m) digital topography<br> is available for most of the Earth (up to 60 degrees N & S latitudes), = and<br> it is much higher resolution than the ETOPO1 data that is 1-arcminute or<br= > about 2 km spacing. The latest release is SRTM version 3.0. The Open<br> Topography website has a new service that will assemble the data and<br> provide the output in three formats<br> (<a href=3D"http://www.opentopography.org/index.php/news/detail/srtm_versio= n_30_global _90m_and_united_states_30m_elevation_data_now_availab/" target=3D"_blank">h= ttp://www.opentopography.org/index.php/news/detail/srtm_version_30_global<b= r> _90m_and_united_states_30m_elevation_data_now_availab/</a>). The GeoTIFF fi= les<br> are easy to convert to GMT .grd files with GDAL.<br> <span class=3D"HOEnZb"><font color=3D"#888888"><br> ++Eric Fielding<br> </font></span><div class=3D"HOEnZb"><div class=3D"h5"><br> <br> -----Original Message-----<br> From: "Walter =C2=A0Smith =C2=A0(HF)" <<a href=3D"mailto:walte= [email protected]">[email protected]</a>><br> Reply-To: World-Wide GMT Usage and Help Mailing List<br> <<a href=3D"mailto:[email protected]">[email protected]<= /a>><br> Date: Saturday, August 9, 2014 11:04 AM<br> To: "<a href=3D"mailto:[email protected]">[email protected]= I.EDU</a>" <<a href=3D"mailto:[email protected]">GMT-HELP@L= ISTS.HAWAII.EDU</a>><br> Subject: Re: [GMT-HELP] Pixelated, Regional Topograpy Data<br> <br> >=C2=B3pscoast=C2=B2 is defaulting to a low resolution coastline. Try ad= ding -Df or<br> >check the usage message to get your highest option.<br> ><br> >There is higher resolution topography than ETOPO1, such as SRTM3. You= =C2=B9ll<br> >have to search around and you may have to assemble it from a few tiles<= br> >that you may have to download separately.<br> ><br> >Walter<br> ><br> >On Aug 9, 2014, at 1:50 PM, Gregory (Greg) Brenn <<a href=3D"mailto:= [email protected]">[email protected]</a>><br> >wrote:<br> ><br> >> Hello,<br> >><br> >> New user of GMT here, and I'm attempting to create a map of Co= sta Rica<br> >>and overlay coastlines and earthquake locations. =C2=A0Here is my S= cript:<br> >><br> >> #!/bin/bash<br> >><br> >> clear<br> >><br> >> xyz2grd COSTARIC-6565.xyz -Gcostarica.grd -R-87/-84/9/11 -I2m -V<b= r> >><br> >> grdimage costarica.grd -JM12 -K -Cmy-topo.cpt -R-87/-84/9/11 >&= gt; <a href=3D"http://map.ps" target=3D"_blank">map.ps</a><br> >><br> >> pscoast -V -O -K -JM -R -W1 >> <a href=3D"http://mappy.ps" t= arget=3D"_blank">mappy.ps</a><br> >><br> >> psxy loc.txt -JM12 -R-87/-84/9/11 -Sc.1 -G'45/59/100' -B1/= 1 -O >> <a href=3D"http://map.ps" target=3D"_blank">map.ps</a><br> >> gv <a href=3D"http://map.ps" target=3D"_blank">map.ps</a><br> >><br> >><br> >><br> >> I am using a generic color palette which I can change easily, but = the<br> >>coastlines are extremely low quality, and the topography is extreme= ly<br> >>pixelated.<br> >><br> >> I look at images in papers, and there's extremely high quality= <br> >>topographic images of COsta Rica, for example, as well as the coast= lines<br> >>and bathymetry, but I have no idea where I can get this high-qualit= y<br> >>data. =C2=A0I have tried to get ETOPO data, but I cannot seem to fi= nd where<br> >>to get high-quality data.<br> >><br> >> So I guess my question is, is ETOPO1 the best place to get high-qu= ality<br> >>topo data, because I cannot seem to figure out how to download data= from<br> >>their website. =C2=A0Also, would I need to download coastline data,= as well?<br> >><br> >><br> >><br> >> Thanks,<br> >><br> >> Greg<br> >><br> >> Mailing list for GMT discussions of all kinds. If you are not sure= you<br> >>have found a bug, discuss it here first. To formally report bugs or= <br> >>request features, please register and add New Issue on<br> >><a href=3D"http://gmt.soest.hawaii.edu" target=3D"_blank">gmt.soest= .hawaii.edu</a> To unsubscribe, send the message "signoff gmt-help&quo= t;<br> >>to <a href=3D"mailto:[email protected]">[email protected]= ii.edu</a> Note: gmt-help will become obsolete on Sept<br> >>1, 2014 - please use forum on <a href=3D"http://gmt.soest.hawaii.ed= u" target=3D"_blank">gmt.soest.hawaii.edu</a> instead.<br> ><br> >Mailing list for GMT discussions of all kinds. =C2=A0If you are not sur= e you<br> >have found a bug, discuss it here first.<br> >To formally report bugs or request features, please register and add Ne= w<br> >Issue on <a href=3D"http://gmt.soest.hawaii.edu" target=3D"_blank">gmt.= soest.hawaii.edu</a><br> >To unsubscribe, send the message "signoff gmt-help" to<br> ><a href=3D"mailto:[email protected]">[email protected]<= /a><br> >Note: gmt-help will become obsolete on Sept 1, 2014 - please use forum = on<br> ><a href=3D"http://gmt.soest.hawaii.edu" target=3D"_blank">gmt.soest.haw= aii.edu</a> instead.<br> <br> Mailing list for GMT discussions of all kinds. =C2=A0If you are not sure yo= u have found a bug, discuss it here first.<br> To formally report bugs or request features, please register and add New Is= sue on <a href=3D"http://gmt.soest.hawaii.edu" target=3D"_blank">gmt.soest.= hawaii.edu</a><br> To unsubscribe, send the message "signoff gmt-help" to <a href=3D= "mailto:[email protected]">[email protected]</a><br> Note: gmt-help will become obsolete on Sept 1, 2014 - please use forum on <= a href=3D"http://gmt.soest.hawaii.edu" target=3D"_blank">gmt.soest.hawaii.e= du</a> instead.<br> </div></div></blockquote></div><br></div> 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 <a href=3D"mailto:[email protected]">[email protected]</a> Note: gmt-help will become obsolete on Sept 1, 2014 - please use forum on gmt.soest.hawaii.edu instead. --089e0149cf9438b275050037f61d--