With all of the current excitement over OS OpenData, I have been thinking about how tracing, imports, etc, affect what data is actually surveyed.
In my mind, I’m preferring having a project where data is obtained purely from ground survey, other projects dealing with other sources of data, and maybe another project to combine them. I’m a fan of ground surveys, and think they mostly tend to produce better results when available, so I may be a little bit biased. Having a project dedicated to ground survey means less chance of peoples’ hard work being trodden over by people tracing maps from the 60’s, or trying to make out features from poor resolution aerial imagery. Combining the data, however, will have more of an overhead than if all data was contributed to one project in the first place. This might deter people from the idea, but is it really that bad? Ground surveyed data tends to be more accurate. If people want other sources so much, won’t they encourage the effort to combine the independent sources? Simon -- A complex system that works is invariably found to have evolved from a simple system that works.—John Gall
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