I potentially have a problem with my QGIS project, where I am attempting to digitise a relatively small map, and part of the project requires a calculation of the area of each of the parcels of land within the site.
Using the OpenLayers Plugin I added Bing Maps and tried to set it to a different CRS. The results were not pretty so I stuck with WGS84 and digitised away. I then come towards the end of the project, calculated my areas using the Field Calculator '$area' and thought 'I wonder what units it's in?' I would ideally like ha, but a brief look online makes me think the numbers I have are in degrees?? Can these be converted or are they likely to be inaccurate as I'm in the UK and not remotely near the equator?
I am also having problems in the print composer, where the area that I digitised looks fine until it is exported to an image, whereby the boundaries etc are all about 1 cm to the left of where I drew them. Is this another WGS84 hang up?
So my questions really are:How can I get my maps to look like I drew them? andHow can I get reliable area figures?
Whilst I am comfortable with GIS, I haven't long come to QGIS and a step-by-step guide would be really useful.
Thanks
K
أكثر...
Using the OpenLayers Plugin I added Bing Maps and tried to set it to a different CRS. The results were not pretty so I stuck with WGS84 and digitised away. I then come towards the end of the project, calculated my areas using the Field Calculator '$area' and thought 'I wonder what units it's in?' I would ideally like ha, but a brief look online makes me think the numbers I have are in degrees?? Can these be converted or are they likely to be inaccurate as I'm in the UK and not remotely near the equator?
I am also having problems in the print composer, where the area that I digitised looks fine until it is exported to an image, whereby the boundaries etc are all about 1 cm to the left of where I drew them. Is this another WGS84 hang up?
So my questions really are:How can I get my maps to look like I drew them? andHow can I get reliable area figures?
Whilst I am comfortable with GIS, I haven't long come to QGIS and a step-by-step guide would be really useful.
Thanks
K
أكثر...