<p>Should't be enough plotting in UTM with grid and overlying also Latlong grid?</p>
<div class="gmail_quote">Il giorno 16/apr/2013 15.46, "Carlos Cerdán" <<a href="mailto:sig.upagu@gmail.com">sig.upagu@gmail.com</a>> ha scritto:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div><div><div><div><div>Hi Barend:<br><br></div>You're right, Lat-long maps are just a plane representation of another representation of Earth as an ellipsoid and fails on poles.<br><br></div> > why not use UTM or another projection to start with?<br>
<br></div>Because some times we need simple maps, for example touristic maps of small areas where you can forgot the ellipsoid and take Earth as plane. Examples here: <br><br>- <a href="http://www.rumbosonline.com/images/issue13/13-64-map.jpg" target="_blank">http://www.rumbosonline.com/images/issue13/13-64-map.jpg</a> <br>
- <a href="http://www.kuelapadventure.com/spanish/index.php/tips-de-viajero/mapa-turistico-chachapoyas" target="_blank">http://www.kuelapadventure.com/spanish/index.php/tips-de-viajero/mapa-turistico-chachapoyas</a><br><br>
</div>A Lat-long grid would be useful to locate any place of these maps in Google Earth but it's missed on both of them.<br>
<br>An UTM grid not always is a complete help. For example Where is the place of next map: <a href="http://dynacorgold.com/en/casaden-overview-map-casaden.php" target="_blank">http://dynacorgold.com/en/casaden-overview-map-casaden.php</a> ? You have 60 options if you don't know what UTM zone is it.<span lang="en"><span><br>
<br>If this is not sufficient for you... well I'll be wrong but I find useful this kind of maps.</span></span><span lang="en"><span><br><br>Thanks for the</span> <span>dissertation<br>
<br></span></span></div><div><span lang="en"><span>Carlos<br></span></span></div><div><div><br><div><br></div></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/4/16 <span dir="ltr"><<a href="mailto:b.j.kobben@utwente.nl" target="_blank">b.j.kobben@utwente.nl</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Carlos,<br>
<br>
I understand that you think the combination is useful, but my point is<br>
actually that the scale bar is NOT useful because it is plain wrong, it<br>
does not even approximate distances in many places in the map! Try<br>
wrapping you head around the fact that the North Pole (a single point of<br>
length 0 km) is actually shown as a line of the same length as the equator<br>
(40075 km), and you see how wrong your "approximate" distances can be....!<br>
<br>
<br>
And you do not answer my question: why not use UTM or another projection<br>
to start with? Latlon SEEMS simple, but many casual users fail to<br>
understand that they are actually looking at angles from the center of a<br>
Globe, plotted as if they are XY-coordinates on plain.<br>
<br>
<br>
And do not worry, your english is fine!<br>
<br>
Barend<br>
<div><div><br>
On 15-04-13 22:17, "Carlos Cerdán" <<a href="mailto:sig.upagu@gmail.com" target="_blank">sig.upagu@gmail.com</a>> wrote:<br>
<br>
><br>
><br>
><br>
>2013/4/15 <<a href="mailto:b.j.kobben@utwente.nl" target="_blank">b.j.kobben@utwente.nl</a>><br>
><br>
>Hi there,<br>
><br>
>I appreciate the clever tip for having a km scale bar on a lat-long maop,<br>
>but as a cartogra[her I must protest, because the scale bar is of course<br>
>mostly nonsensical. The differences in distances between the two (mercator<br>
>projected UTM and non-projected degrees) can potentially be huge. The<br>
>scale bar therefore cant be grossly wrong...<br>
><br>
><br>
><br>
>Ajá.. As a simple user I find useful a scale bar to measure approximate<br>
>distances on a lat-long map.<br>
><br>
>If you have your map in UTM, why not print that one with the proper scale<br>
>bar? The question to the original poster therefore would be: why do you<br>
>feel the need to have a map in degrees, why not use one that is projected<br>
>and where km is the proper scale-bar...?<br>
><br>
><br>
><br>
><br>
>In the same sense: If you want to show the location of a place on Earth<br>
>to not GIS skills people, Lat-Long is useful for a first reading location<br>
>and scale bar to measure approximate distances ... so Why no use that<br>
>combination?<br>
><br>
><br>
><br>
>Developers please fix an issue (Correct me if it's not an issue):<br>
>when you have two or more maps in a compositor and the scale bar is<br>
>related to map 1 (or more), and you close your file, next time you open<br>
>it, scale bar is related to Map 0 and you have to select Map 1 again.<br>
>(QGIS 1.8 - Ubuntu 12.04).<br>
><br>
><br>
>Carlos Cerdán<br>
><br>
><br>
><br>
>PD Sorry if my English is bad.<br>
><br>
><br>
><br>
><br>
><br>
<br>
</div></div></blockquote></div><br></div>
<br>_______________________________________________<br>
Qgis-user mailing list<br>
<a href="mailto:Qgis-user@lists.osgeo.org">Qgis-user@lists.osgeo.org</a><br>
<a href="http://lists.osgeo.org/mailman/listinfo/qgis-user" target="_blank">http://lists.osgeo.org/mailman/listinfo/qgis-user</a><br>
<br></blockquote></div>