Destructive operations on read-opened datasets should raise

[turboladen]

GDAL seems to let you change raster data (and maybe vector too?) even if you've opened it in read mode. Well, it doesn't let you really change it--it just doesn't bomb out when you try to change it, but also doesn't change the data. This leaves you thinking you've called the right methods, etc, but confused when the outcome of our dataset isn't what you expect.

There are a number of RasterBand methods that change data of self that could benefit from checking what access mode the dataset was opened with.

http://gdal.org/1.11/gdal_8h.html#a25ac3c86b87c0d936014085ee27ba2b8