Latest Contributions by NeilAyres

I do know that Indonesia has a v large number of islands... Are you doing this in geographic coordinates and using a geodesic distance? Or in projected coordinates and using a planar distance. If you are going to cut your dataset up into multiple pieces, you could create a fishnet grid : Data Management / Feature Class / Create Fishnet, then use the Split tool in Analysis Tools / Extract. You don't say what version you are using. ... View more

So you have loaded the data table into ArcMap and created an event theme? Points on the map. Make sure that the excel table has a proper header line, no funny characters in the column names, and that the data comes in with the correct types (numbers are numbers, text is text etc). So what happens when you try to export data to a shapefile? ... View more

if you search for archydro you will get several links. Basically you have to cut or "burn" a slot through your "dam wall" to simulate the culvert. ... View more

On the face of it. you should have 10 possible combinations. Are the 2 raster exactly the same pixel size? Are they aligned (does the edge of each pixel overlay)? If not you will have to resample one to fit the other. And BTW, are you using projected coordinates? ... View more

There is obviously something odd about the numbers in the file. And are not being interpreted properly when importing the table. Why not try using the access text importer instead. Use ArcCatalog to create a personal goedb (Access mdb). Then close AC, and open the mdb using access, then import. There you can specify the field types, headers etc. Once you have your table in access, do the usual, create the feature class. Don't forget to specify the coordinate system correctly. ... View more

Here's the info from ASPRS Clifford Mugnier. Which suggests that Adindan is a bit of a misnomer and it is real the Blue Nile datum. But there are transforms available in the system. See Adindan_To_WGS_1984_4 WKID=1103 Accuracy=6.000 Page 2 and 44 of the geographic_transformations.pdf in the ArcGIS documentation folder. ... View more

Well, what's this doing in the code? while True: Looks like it will just keep going around and around forever. ... View more

Back in the day, we captured geology data into coverages. Every line has meaning, every polygon has meaning, and everything hung together really well. Just digitize, clean and build. Doing the same thing in the geodatabase simple feature classes, even with topology, is really hard. I know why esri moved away from coverages, scalability, multiple editing, etc, etc. Anyone remember Librarian? Gee that's going back a bit. ... View more

And I also had to wrap my update in an editing session. ... View more

Just tried to implement this tool from Xander, thank you. However, it won't work as stated. You can't iterate over an insert cursor. It should be UpdateCursor, because we are updating an existing field. ... View more

The imagery basemap is still exactly where it was. Obviously, the resolution varies depending on what is available. Are you saying that, in your area of interest, the resolution has degraded? ... View more

Sorry, what do you mean? "high resolution imagery option is missing".... ... View more

So 102100 is actually 3857 and has been like that since v10.0. That's why I can't find a reference to it. So what is this : (20037508.3427892) Is that one big long number with 7 decimals or actually 2 numbers separated by ".". A "Coordinate" implies at least 2 numbers, an X & a Y. And which corner is it? LL, LR, UL, UR??? ... View more

Were you having a bad day, Vince? ... View more

What is WKID 102100? I can find no reference to it in my docs. The closest 102101 and up is a bunch of coordsystems for Norway. As for the corner coordinate, only you would know that? Worldwide UTM zones (WGS84 based) are numbered 326 + zone number for the northern hemisphere and 327 + zone number for us in the south. ... View more