I am using QGIS 2.0.1 under Mac OS-X 10.8.2. I have a layer of counties in New Mexico to which I have joined a csv file that includes presence / absence of plant species by county. I've set up the layer style to show presence (coded "1") as grey and absence (coded "0") as white. So I can go into "Layer Properties", go to "Style", select the appropriate plant from the "Column" pull-down list, and I have a map that is nicely filled to show counties in which the plant is present.
The question is--how do I create an output image for each species showing its distribution?
At present, what I would have to do is the following: 1) Select a species from the pull-down list in "Layer Properties": yielding a map that looks like this: 2) Enter "Print Composer", get all that set up, export as an image: 3) Switch back to the main QGIS window, open up "Layer Properties", and select the next species: 4) Switch back to the Print Composer, and export the next image:
Now, that all works, but given that I have several thousand species to deal with, this is not a remotely efficient way of approaching the issue. So I am trying to figure out how to automate map creation so that I can create a set of images incremented over all the attributes in this layer. So far, I've come up empty. The "Atlas Generation" plugin that's been integrated into the Print Composer seems to solve essentially the same issue, but so far as I can tell it can only increment across rows (features) and has no ability to increment across columns (attributes). Any suggestions?