FW: [Qgis-user] problems with layers from one source

[Caroline Rendon]

Okay, I'll take another look. I thought I'd adjusted the CRS for all layers
but I must be missing something. Thanks for your help!

Caroline

On Sat, Dec 17, 2011 at 11:31 AM, Gerardo Jimenez <gejst5 at hotmail.com>wrote:

>
>
> Gerardo Jiménez Delgado
> Instituto de Investigaciones Antropológicas
> Universidad Nacional Autónoma de México
> Ciudad Universitaria s/n
> Coyoacan 04510 Mexico City
> Mexico 56 22 95 16
>
> ------------------------------
> From: gejst5 at hotmail.com
> To: caroline.t.rendon at gmail.com
> Subject: RE: [Qgis-user] problems with layers from one source
> Date: Sat, 17 Dec 2011 12:30:49 -0500
>
>
>  I am sorry to differ. They can not be in the same CRS. A latitutude
> longitude CRS has valus for longitud +- 180 and for latitude +- 90 Degrees.
> A crs such as a UTM (for instance) could have values in the 10,000 to less
> than a million for the east, and northings  could have values from 0 to
> almost 10,000,000. Then, your data could not share crs. If you change the
> crs in propertied/general/specify crs that aill not make any difference and
> could make the problems worst since, for instance, if your data is in the
> west hemisphere and you load data from a utm layer   as a latitude longitue
> crs ,  any GIS (not only qgis)all will be displace the layers, since utm do
> not handle negative values. In order that data could be in the same crs you
> have to reproject your data. Reprojecting converts from one crs to another
> totally different (from espherical coordinates to metric ones). For vector
> layers in qgis 1.7 you have the layer and chose save as, define the file
> format, choose the original crs and the one you want. For raster layers you
> have to go to raster/projections/war(reproject). In order to reproject, I
> insist, you must know the original crs of your data.
>
> Can you let us know where your data is located? also if you know the crs?
> also sometimes it is worth to know which version of Qgis you are using and
> in which OS you are using...
>
> Hope it helps
>
> Gerardo Jiménez Delgado
> Instituto de Investigaciones Antropológicas
> Universidad Nacional Autónoma de México
> Ciudad Universitaria s/n
> Coyoacan 04510 Mexico City
> Mexico 56 22 95 16
>
> ------------------------------
> Date: Sat, 17 Dec 2011 10:33:17 -0600o select the laye
> Subject: Re: [Qgis-user] problems with layers from one source
> From: caroline.t.rendon at gmail.com
> To: gejst5 at hotmail.com
> CC: qgis-user at lists.osgeo.org
>
> The CRS is the same for all my layers, this doesn't seem to change
> anything.
>
> On Sat, Dec 17, 2011 at 7:06 AM, Gerardo Jimenez <gejst5 at hotmail.com>wrote:
>
>  The main problem could be that your layers are in different CRS. I assume
> that you want to use lat lon coordinates ("they should be in the range of
> (-87, 41)"). Because you can not have millions of degrees, it is pretty
> sure that the layers that display coordinates in the millions could be a
> CRS that defines its measuring units in meters or feets. For vector layers
> (and assuming a format that can store projection information), select the
> layer , right click, choose properties and go to the general tab. There you
> must be able to see the projection information. For raster layers go to
> rater menu,  choose Miscellaneous and select info. Choose your raster and
> you must be able to see the projection information there.
>
> I like to have all my layers in the same CRS, some people also likes to
> use the "on the fly CRS transformation" capability of QGIS . Try in
> Settings, project settings and go to the CRS tab, Choose "enable on the
> fly CRS transformation", then load some layers. One  thing is for sure, you
> must know the crs of each of your layers before starting to work with them.
>
> Hope it helps
>
> Gerardo Jiménez Delgado
> Instituto de Investigaciones Antropológicas
> Universidad Nacional Autónoma de México
> Ciudad Universitaria s/n
> Coyoacan 04510 Mexico City
> Mexico 56 22 95 16
>
> ------------------------------
> Date: Fri, 16 Dec 2011 11:36:07 -0600
> From: caroline.t.rendon at gmail.com
> To: qgis-user at lists.osgeo.org
> Subject: [Qgis-user] problems with layers from one source
>
>
> Hello (again!)
>
> I'm having trouble with all the layers I download from one particular
> source. These layers don't show up in the same place as any others of the
> same area, including those I've geocoded myself. The coordinates shown at
> the bottom of the screen for these are HUGE - they should be in the range
> of (-87, 41) but they're in the millions. I've made sure all layers are in
> the correct CRS and done everything else I can think of. Does anyone have
> any tips or ideas? Thank you!
>
> Caroline
>
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