Latest Contributions by NeilAyres

I thought Pro was a full on 64bit app, so it should be able to address tb's of memory. Havn't played with it yet. Sort of hanging back. Plus the news of the "rental" subscription is irritating. Next laptop will have a minimum of 16Gb of ram ... View more

I think I would have made points from the original input and then just re-gridded them using Natural Neighbour interp into square pixels. The ration of X to Y will be a function of the projection that the data was processed in. Why not go back to a projected coord sys for the area of interest. To me, square pixels makes more sense than "rectangular" ones... ... View more

But do you have the correct description / parameters for your mine grid projection? If so, then this is very easy as Sephe said. ... View more

And giving yourself the answer after so many people contributed is bad form... ... View more

You are on the right track there with "findAndReplace...." As you have probably seen the examples here : http://resources.arcgis.com/en/help/main/10.2/index.html#/Updating_and_fixing_data_sources_with_arcpy_mapping/00s30000004p000000/ But for the future you should maybe consider using relative pathnames from the mxd to the data. Found in the map doc properties page. ... View more

The Interpolate Shape (3d analyst) tool will resample at any desired density and defaults to the same as the underlying raster cell size. ... View more

Jason, if the "shift" doubled, then obviously make them negative and subtract them from the already assigned XShift/YShift! Once you have the input CAD data correctly defined using this modified Stateplane (now called Mine Grid or something), then everything should be fine. You can keep it like that. If you want to export stuff out you can use either the coord sys of the data (Mine Grid?) or the coord sys of the data frame (or anything else you can think of). And yes, the book mentioned by Margaret Maher is very good at explaining these sort of issues. No, I would not use a links file to shift the data. This should only be used if all else fails, ie if the "mine grid" is in some unfathomably complex shifted rotated relationship to the real world coordinates. ... View more

The block after try: should also be indented as well. How about telling us what errors you are getting instead saying "it doesn't work". Not many clues there. ... View more

Apologies to Heather for rather hi-jacking her thread..... Thanks to Xander for providing that link to the thesis on hydro surveys in a shipping channel. I took some time to read through it. Despite reams of x-validation stats and what-not, it took till page 80 odd to actually see some picture of what the actual interpolations looked like. If the author hadn't actually placed a polygon on each map showing where the "channel" was supposed to be, it would be hard to spot! So, from a visual perspective, non of the techniques discussed did any sort of reasonable job. If fact, awful. I was particularly amused by the universal kriging version. This highlights a particular problem with traverse based data like this. High density of sample points along traverse lines, and a large distance between lines (very high aspect ratio). Non of the traditional interpolation techniques are good at making sense of this sort of data. Perhaps Dan would like to make a separate thread for these sorts of discussions. ... View more

This bit is not going to work - for fc in fcList:     if fc != spatialRef: Consider what you are doing here. fc is an text item from your list of features. But spatialRef from the template describe object is a spatial reference object. So they will never be equal. Inside the loop you need to do another Describe of each fc, get the SR of that, then compare. ... View more

Kriging is used to fool the innocent. And you can take a gratifying amount of time messing around with it. ... View more

Well, once you have decided upon the correct projected coordinate system for your data area, you should really start again. Just project the actual DEM, then start again generating the filled dem, flow direction etc. Projecting from GCS (or from anything to anything) can actually "close" flow lines where they were open before depending on the DEM resolution and the resampling (in the projection step) involved. ... View more

Map projections beginning : ArcGIS Help (10.2, 10.2.1, and 10.2.2) What do you mean "add pour points". I was asking how are you obtaining your pour points for the purposes of a watershed deliniation. That is all in the help files under hydrology. Start here : ArcGIS Help (10.2, 10.2.1, and 10.2.2) If you are simply adding a point shapefile which you have created in ArcCatalog. Then there is definitely something different about its coordinate system relative to the DEM coord sys. Right click on it and find out what it is defined as. ... View more

How are you getting your pour points and how do you define the snapping distance given that this data is in degrees. Personally, if I was doing this, I would put the data into a flat projected system first for the analysis. ... View more

Personally I would make this a 2 stage process. Project & clip or clip & project. When setting the processing extent in the environment, I suppose its talking about the original coord sys. ... View more