Latest Contributions by NeilAyres

Somehow, I find this is easier to get my head around... >>> >>> List = [[1,2],[3,4], [5,6], [6,7]] >>> for l in List: ... l.reverse() ... >>> List [[2, 1], [4, 3], [6, 5], [7, 6]] >>>‍‍‍‍‍‍‍‍ ... View more

list.reverse() method will swop each xy around. ... View more

Dan, sorry, been a bit busy. Just looked into matplotlib, but where do i find this Affine2D class? Thanks, ... View more

Nice approach Joshua. Cool use of a set. ... View more

To specify the inputs to the tool, just use the little envelope on the right of each input box and navigate to the data using that. ... View more

Or just use the spatial select tools to select the underlying parcels within and on the edge of your project area, then save them out and dissolve all together to get a project boundary that matches the parcels. ... View more

I would normally not do this on the entire raster or rasters but create a random subset of them using Create Random points and then use Sample. Then just use the graphing tools inside ArcMap. ... View more

Also a Near analysis table can give you the distance and bearing to the matched point auto magically. Then just filter the table for when the ID is the same both sides. ... View more

What do you mean by this : "reshape automatically"?  Unfortunately auto magic is not often supported. Why don't you look at the overlay toolbox, intersect or union comes to mind. ... View more

And, in the original code I found, why do i need the extra 0.0 in the array before that pad lambda function? Never use those, cos i can't get my brain around them.... ... View more

Dan, thanks for your help on this... Well a representative sample are those 4 points I posted originally. The local points are from a rotated project grid. And the refPoints are as measured using the national grid system (which is normally oriented). Both are on the same classical datum for the area. The datum transformation dosn't come into this. I have other examples here, but these are good enough I think. The code I found give me a good idea of the overall fit of the points, and will enable me to identify any points which are way off because of measurement or transcription errors. I was just trying to come up with a method that would enable me to describe a local coordinate system - origin point, rotation and scale, to correctly define this system in an ArcGIS prj. ... View more

Dan_Patterson‌ could I try to revive your interest in this? Hopefully you are now close to your "archive" and ready to share some of that mathematical wizardry from yourself or Bill Huber. ... View more

I think you will have to give us a little more detail of what data you have, what software version and exactly what it is you want to achieve. ... View more

Can't you just measure it? ... View more