Latest Contributions by NeilAyres

Used the Stream Order tool in SA many times. Works well. Is your DEM hydrologically correct, no sinks etc? What does your Flow Direction surface look like? What do you mean "it duplicates higher values"? Cheers, Neil ... View more

Melita, you must have the patience of Job! Keep up the good work. ... View more

Of a bigger mystery to me is why you would want to do this in the first place? Why take a single feature class (in your case a shapefile....) and split it into many shapefiles by a country id? Many more files to manage and keep track of, instead of one. If you just want to see a single country polygon on your map then simply use the definition query on the properties page of the layer. Cheers, Neil ... View more

I have also seen this before, not during an animation but just in ArcScene. I believe its just down to the graphics memory. Need to beef this up. Maybe a new fancy card? Perhaps someone else has a better fix! Cheers, Neil ... View more

I also couldn't get this old samples script to go in 10.1 Yes, did see those funny ` and wondered what they were doing. So ended up hacking my own script for arcpy from the body of this. py script attached. If any of you py experts want to improve this, please do as long as you post the new improved version back here of course. I need all the help I can get. Cheers, Neil ... View more

Had a look at this tool yesterday. I see it just adds columns automatically to the feature and calculates the selected variable(s). All well and good, but why is this not just part of the "Calculate geometry tool" on a column of the attribute table. That way I can add columns / data of my choice. Perhaps this should be posted into "Ideas".... Cheers, N ... View more

I knew it had to be there somewhere. Thank you Eric. ... View more

Okay Pete, As I havn't yet upgraded my system, is there a way to select a coordinate system, modify it then "Save As"? But this is quite a change and I agree with the comments above. N ... View more

Phew, I am so glad I stumbled across this little gem. I was about to upgrade my system to 10.1 this w/end. Now I am not so sure.... The old directory system of *.prj files worked and was quite flexible. ie It was easy to create a new prj for a particular project, say a custom crafted UTM like system (ie with a non-standard central meridian). Now what do you do? It was also useful to browse the directories when searching for obscure projection info for certain regions. Why make this info harder to find? And use. Oh and Yes, I can also memorise all xx thousand "factory codes".... Miffed, Neil ... View more

Maybe I'm getting you wrong here but note that the weights input into a flowaccumulation function multiplies the wt X flowacc in each cell. So in this application your wt grid should be a proportion of water vol removed / total water, ie a number between 0 and 1. Might need some extra toil here but if the water is extracted at only certain points then they should be set appropriately (like 0.75 meaning 25% of the input has been extracted) and all other values set to = 1 (100% passes through). I think this should work. Cheers, N ... View more

No worries, and yes I do read the help files before posting here.... My approach was exactly that, use cursors to cycle through the relavent geometries. However, I was reading the geometry objects into a python list first before testing with the various methods. N ... View more

Probably meant to say ".within()", but no matter. Just wanted to know if there were any scripts or pointers out there using these methods with objects in a python list or dictionary. All the help seems to build a geometry object from scratch, then do some anlaysis on it. Rather than reading the geometry object from an existing fc. Will have another go at this when i have a little more time.... Thanks anyway. Neil ... View more