Latest Contributions by DavidViljoen

Check out the ESRI WKT for WGS 1984 http://spatialreference.org/ref/epsg/wgs-84/esriwkt/ and NAD83 http://spatialreference.org/ref/epsg/4269/esriwkt/ You will find them identical except for the inverse flattening. 298.257222101 (WGS84) 298.257223563 (NAD83) As you can see, they are identical to 5 decimal places.  At mapping scales, this translates into a difference of approximately a metre but does differ depending on where you are (refer to this link:  Difference:  WGS84 and NAD83)  The difference between WGS84 and NAD83 will grow as tectonic plates move around. If your data does not have sub-meter precision, you will not see any difference between the NAD83 and WGS84. I hope you find this useful. ... View more

I have written a couple of relatively simple apps: 1.  ASP.NET app to show current users of ArcGIS (ArcInfo/ArcEditor/ArcView) and extensions.  It shows when they started the session and it provides a simple mailto link to e-mail any/all current users (e.g. "Are you really using .... if not, please exit and let me know") 2.  Windows service to poll ArcGIS license servers and write the current users and features being used to a database.  The time window (when to start / end polling) and frequency (in hours or fractions of an hour) I can be contacted viljoen@nrcan.gc.ca if you are interested. ... View more