Latest Contributions by DanPatterson_Retired

Perhaps the -ve was left out of the Lancashire data putting it to the east of 0 Long.  spatial join should be by coordinates, so I would check file separately in its own dataframe to ensure that the unprojected coordinates line up where they should ... View more

Have you tried the join on unprojected data? ... View more

interpolation doesn't depend upon the variable being measured but upon the nature/pattern of the sampling points, their variability and a variety of other things, snow depth is simply a z-value ... View more

Grief...again...are you telling me you have to PAY to get certified???  What if your first language is Latin? 🙂 JB....you promised...tomorrow is the day, ...may the force be with you! (the new MTHFBWY Python/ArcGIS module will be released in ArcGIS 10.2 currently in Alpha testing which will miraculously put all posts into their respective forums which will total no more than a dozen and everyone will know where their "stuff" will go 🙂 it's been fun) ... View more

Grief!...You reach a certain age and exposure to GIS that GISP certified really isn't an issue...first computer science course 1968...first GIS stuff was mainframe and on cards...ahhh the youth of today 🙂 ... View more

How accurately do you need the centroid? Are the clusters identified with a particular attribute?  If so, then a bounding container of some form (ie extent rectangle, min area bounding rectangle, convex hull), followed by a centroid or label point determination might be reasonable. If the clusters have no identified attribute which can separate the clusters, then perhaps a dissolved buffer of some reasonable distance to ensure polygons with no holes, followed by a similar centrality point determination might suffice. otherwise, you may have to resort to other clustering algorithms (k-means?) etc. In any event, your 30k points may have to be batched into separate geographic regions followed by a merge. If your example is not really representative of the actual patterning in your data, then all bets are off until further information can be provided ... View more

51 / 1131 votes relative to view is underwhelming and I hope that we don't end up with the arcpy stuff from this forum http://forums.arcgis.com/forums/20-ArcObjects-All-Development-Languages ... View more

Thanks David ... View more

Ryan So you are proposing that the forum could be further split depending upon the version of Python and ArcMap and/or whether the questions are pure Python related? ... View more

Yes Python is case-sensitive...many consider it one of its strengths since it ensures that there is no confusion in the namespace, hence, point is not Point is not POINT.  It assists in writing clear code once you get used to it. You will have to do search and replace to update, this also happened during the translation from Avenue to Python code. ... View more

I am not sure about that, it will probably end up being moved to the newly proposed Data Editing forum http://forums.arcgis.com/threads/17451-Do-you-want-an-EDITING-forum ... View more

there are some examples in the online help http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z000000s4000000.htm ... View more

what version of ArcMap? have you ruled out the raster calculator? (placed in different locations depending upon versions) have you ruled out the Constant Raster Tool in ArcToolbox, which can also be implemented via Python. ... View more

Jim Contact me via email should you wish to discuss this further. Dan ... View more