Latest Contributions by RobinWilson

Hi, Thanks for the very prompt reply! However, I can't quite see how to use those tools to do what I want. The Identity and Update tools state in the help that they require at least one of the inputs to be a polygon, and sadly all of my inputs are polylines. Do you have any ideas how to get around this? It looks like I might be able to use the Intersect tool to create points at the intersections, and then join those up with new lines...maybe. Any further ideas? Cheers, Robin ... View more

In this case I'd suggest writing to CSV (comma separated values) files, as they can easily be read both as text files and in Excel (and other spreadsheet packages). As for how to write them in Python, there are a number of options: You could simply write the data using the standard text file writing python commands (see http://snipplr.com/view/6630/reading-and-writing-text-files-in-python/ for a simple tutorial) and put comma's between them. For example, I used the following code in one of my projects: # Open the file FILE = open(output_file, "a") # Write the header (so I can remember what each column is!) FILE.write("name,n,mean_len,total_len,max_len,min_len,stdev_len,mean_closeness,std_closeness,defect_dens,r_score,z_score,p_value\n") # Get the line that I need to write to the CSV file (it is returned from a function I wrote to do my processing) csv_line = process_file(full_path) # Print it to the screen (just for testing really) print csv_line # Write it to the file FILE.write(csv_line + "\n") # Close the file FILE.close() Of course, I also had some code within the process_file() function which created the line of CSV to write: # Put all of the statistics into a list - in this case all of the items in the list are variables that I have calculated output_stats = [tidied_file_name, n_dunes, mean_len, total_len, max_len, min_len, stdev_len, mean_closeness, std_closeness, defect_dens, r_score, z_score, p_value]     # For each of the items in this list, convert it to a string and append to an array     for item in output_stats:         csv_array.append(str(item))     # Join this array, adding commas between all the items     csv_string = ",".join(csv_array)     # Return this comma joined array ready to write to the file     return csv_string The alternative is to use a Python library like the CSV library (http://docs.python.org/library/csv.html) which comes with functions to read and write CSV files. Hope that helps, Robin ... View more

I'm afraid I haven't got an installation of Python 2.5 to test this on, but whenever I use GDAL I import it as follows: from osgeo import gdal This is because the gdal module is located inside the osgeo module. Let me know if that works, Robin ... View more

Thanks - that looks great. Is there any difference between the Unsplit Lines tool and the Dissolve tool with the Unsplit Lines checkbox ticked? It doesn't look like there is, but I thought I'd check. Also, does anyone know a way to do this with distance tolerances too (that is, merging lines that are within a certain distance of another line, instead of having to touch the line). ... View more