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Thank you very much Robert,<br>
<br>
I need CRTM05 and according the information that you sent me it will
be: <br>
<br>
+proj=tmerc + lon_0=-84 + lat_0=0 + k=0.9999 +datum=WGS84 <br>
<br>
I guess I only need to set the 0.9999 instead of 0.9996.<br>
<br>
It make sense?<br>
<br>
Best,<br>
<br>
Manuel<br>
<br>
On 16/10/2010 02:32 p.m., Robert J. Hijmans wrote:
<blockquote
cite="mid:AANLkTi=Umx-jDko2jv9WQEgCaQ5-v_FYpnoErTJChZ5n@mail.gmail.com"
type="cite">
<div>Manuel,</div>
<div><br>
</div>
<div>Costa Rica Transverse Mercator is a type of Transverse
Mercator (like UTM). </div>
<div><br>
</div>
<div><a moz-do-not-send="true"
href="http://www.remotesensing.org/geotiff/proj_list/transverse_mercator.html">http://www.remotesensing.org/geotiff/proj_list/transverse_mercator.html</a></div>
<div><br>
</div>
<div>So we have, in proj.4 notation</div>
<div><br>
</div>
<div>+proj=tmerc </div>
<div><br>
</div>
<div>It is revealed here: <span class="Apple-style-span"
style="font-family: 'Lucida Grande','Trebuchet
MS',Verdana,Helvetica,Arial,sans-serif; font-size: 13px;
color: rgb(51, 51, 51); line-height: 18px;"><a
moz-do-not-send="true"
href="http://www.asprs.org/resources/GRIDS/04-2008-costarica.pdf"
class="postlink" style="margin: 0px; padding: 0px;
direction: ltr; unicode-bidi: embed; text-decoration: none;
color: rgb(16, 82, 137); border-bottom: 1px solid rgb(54,
138, 210);">http://www.asprs.org/resources/GRIDS/04-2008-costarica.pd</a></span></div>
<div><br>
</div>
<div>that the for <span class="Apple-style-span"
style="font-family: 'Times New Roman'; font-size: medium;"><b>
<pre style="display: inline ! important;"><span class="Apple-style-span" style="font-family: arial; font-weight: normal; white-space: normal; font-size: small;">"Proyección CRTM90-WGS84" the </span></pre>
</b></span>central meridian is 84 degrees so we have:</div>
<div><br>
</div>
<div>
<div>+proj=tmerc <span class="Apple-style-span"
style="font-family: 'Times New Roman'; font-size: medium;"><b>
<pre style="display: inline ! important;">+lon_0=-84 </pre>
</b></span></div>
</div>
<div><span class="Apple-style-span" style="font-family: 'Times New
Roman'; font-size: medium;"><b>
<pre style="display: inline ! important;">
</pre>
</b></span></div>
<div>
<span class="Apple-style-span" style="font-family: 'Times New
Roman'; font-size: medium;"><b>
<pre style="display: inline ! important;"><span class="Apple-style-span" style="font-family: arial; font-weight: normal; white-space: normal; font-size: small;">The same author and the document below (a search for "Proyección CRTM90-WGS84" )</span></pre>
</b></span></div>
<div><span class="Apple-style-span" style="font-family: 'Times New
Roman'; font-size: medium;"><b>
<pre style="display: inline ! important;"><span class="Apple-style-span" style="font-family: arial; font-weight: normal; white-space: normal; font-size: small;">
</span></pre>
</b></span></div>
<div><font class="Apple-style-span" face="monospace"><span
class="Apple-style-span" style="white-space: pre; font-size:
medium;"><b><a moz-do-not-send="true"
href="http://www.geotecnologias.com/Documentos/TSCArcGIS_9x.pdf">http://www.geotecnologias.com/Documentos/TSCArcGIS_9x.pdf</a></b></span></font></div>
<div><br>
</div>
<div>provide some additional info such that I would think you are
probably dealing with :</div>
<div><span class="Apple-style-span" style="font-family: 'Times New
Roman'; font-size: medium;"><b>
<pre><span class="Apple-style-span" style="font-family: arial; font-weight: normal; white-space: normal; font-size: small;"><div><div>+proj=tmerc <span class="Apple-style-span" style="font-family: 'Times New Roman'; font-size: medium;"><b><pre style="display: inline ! important;">+lon_0=-84 +lat_0=0 </pre></b></span><span class="Apple-style-span" style="font-family: 'Times New Roman'; font-size: medium;"><b><pre style="display: inline ! important;">+k=0.9996 +datum=WGS84 </pre></b></span></div>
</div></span></pre>
</b></span></div>
<div><br>
</div>
<div>Although there might be <span class="Apple-style-span"
style="font-family: 'Times New Roman'; font-size: medium;"><b>
<pre style="display: inline ! important;"><span class="Apple-style-span" style="font-family: arial; font-weight: normal; white-space: normal; font-size: small;">CRTM90 projections with a different datum out there. And watch for those false eastings and northings (horizontal and/or vertical shifts to express the coordinates in smaller numbers. (I am assuming +</span></pre>
</b></span><span class="Apple-style-span" style="font-family:
'Times New Roman'; font-size: medium;"><b>
<pre style="display: inline ! important;"><span class="Apple-style-span" style="font-family: arial; font-weight: normal; white-space: normal; font-size: small;"><span class="Apple-style-span" style="font-family: 'Times New Roman'; font-size: medium;"><b><pre style="display: inline ! important;">x_0=0<i> </i>+y_0=0 </pre></b></span></span></pre>
</b></span><span class="Apple-style-span" style="font-family:
'Times New Roman'; font-size: medium;"><b>
<pre style="display: inline ! important;"><span class="Apple-style-span" style="font-family: arial; font-weight: normal; white-space: normal; font-size: small;">)</span></pre>
</b></span></div>
<div><br>
</div>
<div><a moz-do-not-send="true"
href="http://spatialreference.org/ref/sr-org/6993/">http://spatialreference.org/</a> did
not have it, but I have uploaded here, so that you can easily
test it by clicking on a map:</div>
<div><br>
</div>
<div><a moz-do-not-send="true"
href="http://spatialreference.org/ref/sr-org/6993/">http://spatialreference.org/ref/sr-org/6993/</a></div>
<div><br>
</div>
<div>With this you could try your luck with spTransform</div>
<div><br>
</div>
<div>
Best, Robert</div>
<div><br>
</div>
<div><br>
</div>
<div class="gmail_quote">On Sat, Oct 16, 2010 at 7:45 AM, Manuel
Spínola <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:mspinola10@gmail.com">mspinola10@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"> Thank you very much
Alexander.<br>
I am looking at the website right now.<br>
In my case I have a very particular coordinate system (CRTM,
Costa Rica Transverse MErcator) in this case, which
parameter I need to know to make the conversion?<br>
<br>
Best,<br>
<br>
Manuel
<div>
<div class="h5"><br>
<br>
On 16/10/2010 05:41 a.m., Alexandre Villers wrote: </div>
</div>
<blockquote type="cite">
<div>
<div class="h5"> Hey Manual,<br>
<br>
One thing to do first would be to ask where you can
find the information... here for example <a
moz-do-not-send="true"
href="http://rwiki.sciviews.org/doku.php?id=tips:spatial-data:change_crs"
target="_blank">http://rwiki.sciviews.org/doku.php?id=tips:spatial-data:change_crs</a>
everything you look for is on that page<br>
And have a look a Applied Spatial Data Analysis with R
(ASDAR) to understand the basics of Spatial objects in
sp package and how to perform what you are looking
for. It will be much more benefitial for you to learn
it by yourself that simply copy a code one can provide
you with...<br>
<br>
HTH<br>
<br>
Best regards<br>
<br>
Alex<br>
<br>
<div>-- <br>
<address> Alexandre Villers, PhD. <br>
Postdoc researcher<br>
Spatial Ecology & Population Dynamics<br>
Section of Ecology, Department of Biology<br>
University of Turku<br>
FIN-20014 Turku<br>
Finland<br>
<br>
@mail: <a moz-do-not-send="true"
href="mailto:alexandre.villers@utu.fi"
target="_blank">alexandre.villers@utu.fi</a><br>
phone: 00358 (0)2 333 5049<br>
<br>
Skype <a moz-do-not-send="true"><img
src="cid:part1.02000902.08060002@gmail.com"
style="border: medium none;" alt="You can
skype me (but think of using Ekiga instead !)"
height="50"></a></address>
<br>
<b>Use open source and free softwares</b><br>
<a moz-do-not-send="true"
href="http://cran.r-project.org/" title="R
statistical software" target="_blank"><img
style="border-color: rgb(255, 255, 255);"
src="cid:part2.05070002.03010309@gmail.com"
height="50"></a> <a moz-do-not-send="true"
href="http://grass.itc.it/" title="GIS software
for data processing, easily replaces ArcMap and
Mapinfo" target="_blank"><img style="border-color:
rgb(255, 255, 255);"
src="cid:part3.04080406.02020001@gmail.com"
height="50"></a> <a moz-do-not-send="true"
href="http://www.qgis.org/" title="GIS
visualization, easily replaces ArcMap or Mapinfo"
target="_blank"><img style="border-color: rgb(255,
255, 255);"
src="cid:part4.01020606.04020904@gmail.com"
height="50"></a> <a moz-do-not-send="true"
href="http://fr.openoffice.org/" title="Stop using
Microsoft Office !" target="_blank"><img
style="border-color: rgb(255, 255, 255);"
src="cid:part5.05090205.01000801@gmail.com"
height="50"></a> <a moz-do-not-send="true"
href="http://www.mozilla-europe.org/fr/"
title="Stop using Microsoft Outlook !"
target="_blank"><img style="border-color: rgb(255,
255, 255);"
src="cid:part6.01080704.04050703@gmail.com"
height="50"></a> <a moz-do-not-send="true"
href="http://www.mozilla-europe.org/fr/"
title="Stop using Microsoft Internet Explorer !"
target="_blank"><img style="border-color: rgb(255,
255, 255);"
src="cid:part7.03010203.00020602@gmail.com"
height="50"></a> </div>
</div>
</div>
<pre><fieldset></fieldset>
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</pre>
</blockquote>
<br>
<br>
<div>-- <br>
<div class="im"> <b>Manuel Spínola, Ph.D.</b> <br>
Instituto Internacional en Conservación y Manejo de Vida
Silvestre <br>
Universidad Nacional <br>
Apartado 1350-3000 <br>
Heredia <br>
COSTA RICA <br>
<a moz-do-not-send="true"
href="mailto:mspinola@una.ac.cr" target="_blank">mspinola@una.ac.cr</a>
<br>
<a moz-do-not-send="true"
href="mailto:mspinola10@gmail.com" target="_blank">mspinola10@gmail.com</a>
<br>
Teléfono: (506) 2277-3598 <br>
Fax: (506) 2237-7036 <br>
Personal website: <a moz-do-not-send="true"
href="https://sites.google.com/site/lobitoderio/"
target="_blank">Lobito de río</a> <br>
</div>
Institutional website: <a moz-do-not-send="true"
href="http://www.icomvis.una.ac.cr/" target="_blank">ICOMVIS</a>
</div>
</div>
<br>
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target="_blank">https://stat.ethz.ch/mailman/listinfo/r-sig-geo</a><br>
<br>
</blockquote>
</div>
<br>
</blockquote>
<br>
<br>
<div class="moz-signature">-- <br>
<b>Manuel Spínola, Ph.D.</b>
<br>
Instituto Internacional en Conservación y Manejo de Vida Silvestre
<br>
Universidad Nacional
<br>
Apartado 1350-3000
<br>
Heredia
<br>
COSTA RICA
<br>
<a class="moz-txt-link-abbreviated" href="mailto:mspinola@una.ac.cr">mspinola@una.ac.cr</a>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:mspinola10@gmail.com">mspinola10@gmail.com</a>
<br>
Teléfono: (506) 2277-3598
<br>
Fax: (506) 2237-7036
<br>
Personal website: <a
href="https://sites.google.com/site/lobitoderio/">Lobito de río</a>
<br>
Institutional website: <a href="http://www.icomvis.una.ac.cr/">ICOMVIS</a>
</div>
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