Use Table Manager (Qgis python plugin) to manage table (i.e. delete and add columns). At the moment, it will save the new table into a new shapefile (*.shp, *.dbf, etc).
Noli On 3/11/12, Jake Maier <j...@jmforestry.com> wrote: > I try to delete some of the fields (columns) in the attribute table but the > delete feature is grayed out weather I toggle editing mode on or off. > How can I delete a field? > Jake > > -----Original Message----- > From: Noli Sicad [mailto:nsi...@gmail.com] > Sent: Saturday, March 10, 2012 6:59 PM > To: Jake Maier > Cc: qgis-user@lists.osgeo.org > Subject: Re: [Qgis-user] qgis vs grass > > To calculate area - (shapeflie file) in QGIS, > > Have a look on the Vector (menu)->Geometry Tools -> Export / Add geometry > columns. > > You will get a new shapefile with area and perimetre columns > > Simple hack for acres; > > Open dbf file of that shapefiles in LibreOffice / OpenOffice add a new > columns for arces and just just conversion from units to acres. > > I think you can add column as well in the attributes table and add the > formula for conversion tor default unit to acres. > > Re: aerial photos, you can use georeference plugin (C++ plugin - standard > /default installed by QGIS to georeference those photos. It easy and simple > to do georeferencing in QGIS compare to MapInfo and ArcMap. > > Noli > > > On 3/11/12, Jake Maier <j...@jmforestry.com> wrote: >> Thanks Noli, >> That was exactly the advice I was hoping for. >> I write forest management plan, and work with some biologists on >> Natural Resources Inventories. I provide the mapping with a bit >> forestry consulting as a sideline. >> So I want to show drainage maps or vegetation maps (airphotos or >> topomaps overlain with different shaded polygons). >> One important future goal is to show particular stands depending on >> information in the database. I also was hoping grass may provide >> better ways to calculate area. I need English system, acres. I think >> that is not provided in QGIS. >> >> Jake >> >> -----Original Message----- >> From: Noli Sicad [mailto:nsi...@gmail.com] >> Sent: Saturday, March 10, 2012 6:06 PM >> To: Jake Maier >> Cc: qgis-user@lists.osgeo.org >> Subject: Re: [Qgis-user] qgis vs grass >> >> Hi Jake, >> >> If you are just new to QGIS, just use QGIS without Grass plug-in first. >> Familiarize yourself with QGIS. Download and read QGIS manual. >> You can always install the Grass plug-in later. >> >> If you used ArcMap before and not ArcInfo, mostly like to you don't >> need Grass at the moment. Most of QGIS users (including me) have a >> little use of Grass until you want advance Geoprocessing which can not do > in QGIS. >> >> BTW, sort of things you want to use QGIS for forestry application. >> >> ( BTW,I am trying to use QGIS for forest management and Spatial forest >> estate modelling.) >> >> Noli >> >> On 3/11/12, Jake Maier <j...@jmforestry.com> wrote: >>> I'm new to qgis. I used ArcMap before so I have some GIS experience. >>> I have the grass plug-in installed. Should I try to setup the grass >>> database right away and try to do everything within grass or should I >>> first use just qgis without Grass until I get more familiar with it. >>> >>> Any pointers are very welcome. >>> >>> Thanks in advance >>> >>> Jake >>> >>> >>> >>> >>> >>> >> >> > > _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
