Latest Contributions by NeilAyres

Can you give us a picture of what the attribute table looks like? Do you have 1 point with 15 attribute columns with pollutant data in each or... 15 points on the same location each with 1 attribute of pollutant? What are you inputting for buffer distance? ... View more

I take it back.... arcpy.Extent does do some basic checking by default. Clever, clever esri.... >>> ext = arcpy.Extent(0, 100, 100, 0) >>> ext.XMin, ext.YMin, ext.XMax, ext.YMax (0.0, 0.0, 100.0, 100.0) >>> ... View more

YCC can define an extent like that. But you have to get the numbers the right way round. His extent is in the wrong order. >>> import arcpy >>> ext = arcpy.Extent(0, 0, 100, 100) >>> ext.XMin 0.0 ... View more

And, as an additional comment... Is your data in a projected coordinate system (ie NOT geographic)? ... View more

Errr... What selection step??? Here is the Buffer tool : Input Features : presumably your points Output Feature Class : what you want to call the output, usually something like MyInputName_Buffer. Distance : either a fixed number, or if you click the filed radio button, a field containing a number for the distance. If you had another column with a distance (calculated from your "severity" perhaps), that would go here. End Type & Method... Usually leave alone. Dissolve : None - individual buffer polygons will be created for each input point. ... View more

Look in Toolbox / Analysis / Proximity and check the Buffer tool (or the multiple ring buffer). It sounds like you will have to calculate some distance metric from your "severity". ... View more

Well exactly. So wouldn't the sr remain a custom one? Far better just to do sr = arcpy.SpatialReference(25832) # wkid for 'ETRS_1989_UTM_Zone_32N' arcpy.DefineProjection_management(infc, sr) And you can define the sr for a feature class that already has one. With certain caveats of course, don't define the fc as something it isn't... ... View more

Somewhere it is detailed that the default pixel / cell size is set by dividing the range of the extent by 250. That's how you get ~30m pixels. ... View more

I have a feeling that the correct way would be just to set the projection using Define. In the code above I cannot see how the actual projection is redefined. It just changes the "Name" part of the projection text representation. ... View more

And you may want to check the environment settings for the extent, and can set the cell size there. If creating several rasters from different tins (but over the same area), for the benefit of down stream processing, get them all to line up correctly (pixel co-registration), by defining, using the environment variables, the exact extent and pixel size, and use the first as a snap raster. ... View more

Marilena, good to hear that this works for you. Good luck with the rest of the study. ... View more

The Detect Feature Changes tool in Data Management / Data Comparison might give you some clues about what is different. But if these are 2 separate datasets from different providers, it seems v unlikely that anything will be exactly the same. Its a tough one to sort this out. How different is different? Which one is the truth? etc. You might have to hand craft something in python to your requirements. ... View more

And there is a whole bunch of indentations after the ifs that need to be sorted out. ... View more

This inside Access. We are joining Chef (dogs - 2250 records) back to Kallweit (owner - 1306 records). First we create a query which "joins" the 2 input tables (tblChefGPXDataPoints @ tblKallweitGPXDataPoints). Because there is no "join" as such, this just creates a very large / long cross product of the 2 tables. Then query 2, summarises this query across the ChefID and the minimum time. Then query 3, joins this back to the first (a bit circular) so we can find the IDs on both sides. Query 4, then uses this as a join in between the original input tables so we can get back to the Lat/Longs on both sides. Hope this makes some sort of sense. Do you have any folk there who know a little about Access? ... View more