[Qgis-user] creating a point, free basemaps and going past 180
carson.farmer at gmail.com
Tue Oct 20 05:39:20 EDT 2009
Three questions from someone newish to qgis:
> 1. how do you put point data on a map in qgis. This seems to be the
> simplest thing to do in most other gis systems but the most difficult in
> qgis or have I completely missed something. E.g. I have a file of lat long
> coordinates or ordnance survey coordinates in an excel file and simply want
> to plot them out, how do I do that? I have actually done it but only via
> another gis (then saving and replotting the resulting vector format file in
> qgis) or via a .kml file again generated elsewhere.
> If you have the points in an excel file, you can simply save this as a csv,
and open this directly in QGIS. Have a look at the manual , which gives
you a nice walk-through of everything you need to do to get things going. In
particular, have a look at section 12.3 (Delimited Text Plugin).
> 2. how to get hold of free basemap outline data e.g. countries of the
> world. I have tried very many different sources and still not found a nice
> set of data that is relatively easy to use.
> In this case, you should be looking for a shapefile, and there are many
nice ones out there via Google, example:
> 2. how to display and use maps that are not centred on the prime
> meridian and go past 180 degrees e.g. maps of Russia?
> For this, you will want to find out the standard projections for Russian
data. Certainly a shapefile of the world will display data over Russia, but
you will need to find out what the relevant projections are before you do
any real work or mapping.
> This is for a project to plot records of species in Russia i.e. plot the
> location of a sighting, seems straightforward enough but actually turns out
> to be very difficult.
QGIS behaves fairly similarly to most other GIS packages, with perhaps a bit
more emphasis on 'plugins' (which is what you need to get csv files
working). Once you get the right data, and understand a bit about the
projection(s) that you need to be working in, things will go quite smoothly.
For a nice intro to GIS, and some excellent information on projections and
how to work with them in QGIS, have at "A Gentle GIS Introduction", also on
the manual page .
National Centre for Geocomputation
John Hume Building,
National University of Ireland, Maynooth,
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Qgis-user