Hi List,<br><br>i don't think QGIS allow raster reprojection. Maybe that's is your problem.<br><br> best regards<br clear="all">Luigi Castro Cardeles<br>
<br><br><div class="gmail_quote">2009/11/18 Agustin Lobo <span dir="ltr"><<a href="mailto:alobolistas@gmail.com">alobolistas@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
No, what I was doing was different:<br>
I was setting the project to 18S (not 18N) with OTF reprojection, the raster to 18N<br>
and the vector layers got reprojected to 18S but the raster<br>
was not displayed.<br>
I was expecting the raster to be located in the S hemisphere because<br>
the coordinates are negative. In TNTmips, as the coordinates are negative, even if the raster CRS is set<br>
to 18N, the raster is displayed in the S hemisphere. Not sure if this<br>
is what qgis should do, though, as we are dealing with wrongly annotated<br>
raster layers: in UTM, S is S, not negative N.<br>
<br>
On the other hand, I assumed that if you set the project to 18N, then the vector layers would projected to the N hemisphere.<br>
But have tried defining the project as 18N as you say, used Coordinate capture to check lon,lat, and actually get correct lon,lat coordinates (in the S<br>
hemisphere). The vector layers are reprojected to<br>
18, no matter the S or N, the original latitude correctly defines the hemisphere.<br>
<br>
So it works "your way", thanks!<br>
<br>
Agus<div><div></div><div class="h5"><br>
<br>
<br>
<br>
Micha Silver wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi Agus:<br>
I am actually able to do just that. I also am using some Landsat GEOCover images from below the equator, projected, as you say in UTM 39_N_.<br>
I load the raster, set the project CRS to that (UTM Northern) projection, and enable OTF projection. Then I can overlay vector layers, which are WGS84 Lon-Lat., and they are correctly located.<br>
<br>
It's usually not very helpful to say "works for me" but...<br>
Anyway, HTH,<br>
Micha<br>
<br>
<br>
Agustin Lobo wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
The global set of Landsat images on GEOCOVER<br>
<a href="https://zulu.ssc.nasa.gov/mrsid/mrsid.pl" target="_blank">https://zulu.ssc.nasa.gov/mrsid/mrsid.pl</a><br>
is on UTM/WGS projection<br>
but with the Southern hemisphere tiles as UTM zones in the N with<br>
negative coordinates. For example, a tile that should be at 18S is<br>
actually 18N with negative coordinates<br>
("Non-standard UTM definition: For the southern hemisphere, the GeoTiff files<br>
contain positive zone numbers with negative northing coordinates")<br>
<a href="https://zulu.ssc.nasa.gov/mrsid/docs/GeoCover_circa_2000_Product_Description.pdf" target="_blank">https://zulu.ssc.nasa.gov/mrsid/docs/GeoCover_circa_2000_Product_Description.pdf</a> <br>
<br>
As we have some vector layers on geographic coordinates WGS84 and a Geocover tile for 18S,<br>
I've set the project as 18S, enabled CRS reprojection on the fly, and set<br>
the raster CRS to 18N. Unfortunately, QGIS does not display the raster, even<br>
selecting zoom to layer extent. (Using Mimas).<br>
<br>
This is probably not a problem of QGIS, the Geocover projection is just wrong,<br>
but would like to know if there could be a way to circumvent this problem to<br>
be able to use GEOCOVER tiles of the S hemisphere within QGIS.<br>
A way could be making a world file with the Georeferencer plugin, but perhaps<br>
there is a more general way.<br>
<br>
Thanks<br>
<br>
Agus<br>
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