Latest Contributions by ChrisBruce

I have a line feature class and I want to split (or extract) each line at a specific length. This length value is contained in an attribute. I've found a couple of code examples that do similar things but I'm a Python novice and I'm having a hard time putting it all together. On the ArcPy Cafe site I found this example that splits a line into 10 equal parts using the segmentAlongLine method: in_fc = r'c:\projects\waterway.gdb\stream' out_fc = r'c:\projects\waterway.gdb\stream10' out_count = 10 # how many features desired line = arcpy.da.SearchCursor(in_fc, ("SHAPE@",)).next()[0] arcpy.CopyFeatures_management([line.segmentAlongLine(i/float(out_count), ((i+1)/float(out_count)), True) for i in range(0, out_count)], out_fc) This is similar to what I want to do but rather than split a single line into multiple parts I want to iterate through each line in the feature class and extract a segment of the line length from 0 to the number that's contained in an attribute. I also found this example code in the ArcGIS help, which iterates through features in a feature class and prints attributes and geometry values: fc = 'c:/data/base.gdb/well' fields = ['WELL_ID', 'WELL_TYPE', 'SHAPE@XY'] # For each row print the WELL_ID and WELL_TYPE fields, and the feature's x,y coordinates with arcpy.da.SearchCursor(fc, fields) as cursor:     for row in cursor:         print('{0}, {1}, {2}'.format(row[0], row[1], row[2])) I can get code similar to the above to work with my data but I'm having a hard time combining this with the first example to accomplish what I need. I think what I'm having a hard time with is just accessing that length attribute within the cursor. I've tried the following (and several variations) but it crashes: import arcpy in_fc = r'F:\scratch\transects_processing.gdb\transects_test' out_fc = r'F:\scratch\transects_processing.gdb\transects_split' fields = ['SplitLength', 'SHAPE@'] with arcpy.da.SearchCursor(in_fc, fields) as cursor:     for row in cursor:         len = row[0]         arcpy.CopyFeatures_management(cursor.segmentAlongLine(0, len, False), out_fc) If anyone can help with this I would greatly appreciate it! ... View more

I'm working on a model that will create different buffers for different selections. So I'm using Make Feature Layer and adding an expression to select a subset of features and then using the buffer tool on that subset. But there may be times when a selection doesn't return any features, in which case I wouldn't want to run the buffer. Is there a way in ModelBuilder to test whether or not any features are selected and only run the subsequent step if there are? Alternatively I could export to a Python script and handle this testing there but I'm not quite sure how to accomplish this in Python either. ... View more