Latest Contributions by NeilAyres

And Simon, are you sure that the geometries defined as 2054 (Lo31) are really like that. Or just normal TM that is mislabeled / defined. ... View more

Melita, Simon, the only real use for those, so called, "Lo" projection definitions in the Arc software is to be able to define certain "upside down" CAD files that you come across quite frequently here in SA. If you preview one of these in Catalog, generally you can see a north arrow pointing down and the extents will show a +ve Y value. Then all you need is the zone number (17, 19, 21 etc). But I wish esri had not named these things "Lo", cos its not. Should have called it "pseudo Lo" or something. In reality, "Lo" is southward facing and axes swopped (X increases from N to S & Y increases from E to W) and is not supported in anything software I know about. How could it be? Most people just convert single point coords back to a normal, right way up TM (X is Y and Y is X and both are multiplied by -1). ... View more

Perhaps have a look at the properties of several of the CAD files in ArcCatalog. Select the CAD and right click to get the properties page. Look at the extents. If, as Dan says, the values are quite small : -180 < X < 180 and -90 < Y < 90, you are looking at GCS (a grographic coordinate system). You already know that some, or maybe all, are actually in UTM30N. Have a look at some of the ones that don't plot in the correct place. CAD very rarely has a coordinate system defined. I don't think I have ever seen one that came, ready to go. You can just define the ones that look like UTM30N using the same properties page described above. Do you have any more metadata from the originators of this CAD stuff? ... View more

In the Spatial Analyst tool box under Zonal there are the Zonal Statistics and Zonal Statistics as Table. This summarise various stats (mean, min, max whatever) per zone defined as polygons or another raster. There is also the GetRasterProperties_management tool in the data management toolbox. ... View more

If the imagery has got a meaningful extent, which it seems to have, but no spatial referencing information, then it probably has a world file, but the spatial reference is not set. So simply define it. ... View more

You said... "I want to register a set of images (epsg4326)" That's GCS_WGS84. Firstly, you should always try to geo-reference a map / image into the coordinate system it is actually IN. So, why are you not geo-referencing these directly into Lat/Long. And, are you actually sure that the imagery is in fact in this coordinate system? You also seem to have the extent well established (to 8 decimals)? So, are these images already geo-referenced? If so, you just need to Project_management to UTM. And both sides are WGS84 based so you should not need any transformation. ... View more

Have you tried the tools in portalpy? PortalPy ... View more

It's just a small piece of it. You don't have to post everything. And in your previous message there were a total of 8 separate zip files. I don't look at this stuff using outlook. How about an image of a piece of your dem and the flow direction derived raster. That would be a start. Because there is obviously something wrong with your input data. Many, many people have successfully derived stream lines from dems. And they don't go uphill. ... View more

You should actually just zip the entire shapefile into one zip. Downloading each individual component separately will be a bit of a pain. An image of the dem generated from the lidar would also help a lot. ... View more

As Dan says, without proper formatting, it is very hard to tell. But what is your select clause supposed to be doing? # add another point to the selecition w_clause = '"%s" < %s' % (sort_field, i + 1) # e.g. OBJECTID < 1, OBJECTID < 2, ... arcpy.management.SelectLayerByAttribute(in_points_lyr, "NEW_SELECTION", w_clause) ‍‍‍‍‍‍‍ The other thing is, have you considered just running this as a plain python script before you turn it into a script tool, with all the extra that entails. ... View more

Not being a banker, I have no idea. But would imagine that there are thousands of ways that GIS can be applied to your industry. Perhaps start here : Esri Banking ... View more

And, if some process is taking days.... Murphy will always intervene just at the wrong moment ... View more

Those are the components of a shapefile. ... View more

Firstly, what version of Arc are you using and next what version of excel? The old xls had a limit of 65536 rows (2 ^ 16). xlxs or what ever its called had just over a million rows. ( 2 ^ 20). Is there some funny headers in the data? Best place is the table to excel tool, but you say this is erroring out. Check paths for spaces etc. ... View more

Fascinating old map you have there Joshua. ... View more