I am creating new features, adding polygons to a new vector layer. I am tracing over a .tif file raster layer. Am I able to snap to the corners of the pixels of the raster layer when drawing the new vector features? If so, how?
Quick answer - Nope.
Vector can snap to vector, but to raster, no that doesn't seem possible.
The only way would be to turn your raster into a polygon layer using Raster to Polygon.
But the raster would have to be classified (integer only).
And, if the raster is of any size, would make a big feature class.
You want is ArcScan What is ArcScan?—Help | ArcGIS for Desktop
I did find this in my googling, it seems as though I could only use ArcScan if my raster was just two colours?
The tiff I'm using is necessarily RGB. I did find a solution though, see my comment below.
Thanks for the reply.
I found a solution. I used the fishnet tool to create a grid over the area, size specified by the properties of the raster: number of pixels in rows/columns. I now have a polygon layer that sits perfectly over the pixels I want to stick to and can use the trace/snap features.
Thanks for the prompt replies folks, this one was doing my head in.
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