[Qgis-user] Newbie Questions

[Giovanni Manghi]

Hi,


> 1. I tried doing this with Join Attributes and selecting the CSV file.
> However I found that when QGIS reads in the CSV file, it casts all of
> the columns as Text, so I couldn't use the numerical values. I notice
> the Join Attributes from CSV feature is new in QGIS 1.5.0. Maybe there
> is a bug?


you can do Joins with dbf tables. New join features are being developed.


> 2. Eventually I will want to put my data into a database. I notice I
> can choose between SpatiaLite and PostGIS. Which is easier to use? Is
> there a performance difference?


among the others, Postgis is an extension of PostgreSQL, so is server
based, spatialite is file based.



> 3. In ArcMap, I frequently used the capability to vary the thickness
> of line features according to a value in the attribute table. I notice
> that this capability is available in QGIS only for points ("drawing by
> field") but not for line features. Is there another way to accomplish
> variable thickness lines in QGIS? If not, is "drawing by field" for
> line features under development?

new symbology -> advanced -> size scale field


cheers

-- Giovanni --