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GetParameter() - Double Value needs to be re-cast as a Double (from string)

MGAL

In my tool, I have one parameter that accepts a double value. In my script, I have to re-cast the value as a float() type.

proximity_threshold = float(arcpy.GetParameterAsText(1))

This feels kind of silly to have to re-cast the value that was originally input as the correct data type.

Is there a more elegant solution here that I'm not seeing?

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MGAL

That worked...

I'm still not understanding why the double data type is so buried in the tool. For example, I also have a boolean parameter in this tool, and the ".GetParameter()" method works w/o transformation.

In my mind, the toolboxes parameters should dictate the data type of the incoming data as it was configured in the toolbox. Otherwise, what's the point of setting a data type?

danretired

you can float both with issue in python

(float(1) == float("1")) and (float("1.0") == float(1.0))
True

so if it isn't an integer, float/double or text, what is it?

MGAL

near_dist isn't a parameter... it's derived from the script. it's the variable for the output of .distanceTo() the geometry method (outputs double).

the script joins information from two different line feature classes, to a table of inspection points. where the tables' ID's don't match 1:1 (for reasons i don't want to get into ) the script reverts to a proximity match. the proximity match is the min threshold that automatically matches the line to the point.

def find_closest_line(pcs_geom, input_fc, oid_idx, shape_idx, proximity_threshold):
    near_dists = {}
    for feats in input_fc: 
        for k,v in feats.items():
            oid = v[oid_idx]
            shape = v[shape_idx]
        near_dist = pcs_geom.distanceTo(shape)
        if near_dist < proximity_threshold:
            # arcpy.AddMessage("Bullseye!")
            return list(feats.values())[0]
        else:
            near_dists[oid] = near_dist
    if len(near_dists) == 0:
        return False
    closest_oid = sorted(near_dists.items(), key=lambda item: item[1])[0][0]
    closest_feat = [oid for rows in input_fc for oid in rows.keys() if oid == closest_oid]
    for feats in input_fc:
        for k,v in feats.items():
            if v[oid_idx] == closest_oid:
                return v
    return closest_feat

(note that "input_fc" is really a list of python dictionaries derived from SearchCursor)

depending on the size & location quality of the incoming dataset, this value can be adjusted to speed up the process, or slow down the process to get better accuracy. the tool also has a boolean parameter that puts the process into a test mode to allow the user to see the results as a formatted arcpy message, before the data is appended to the master inspection table.

not a dumb question!

abaldenweck@blm.gov_BLM_EGIS

Dumb question, but what's the parameter type of near_dist?

LTS_DSolari

Alfred's suggestion is the intended way to get a Double parameter so I can't say why it's failing for you. As a workaround, try getting all your parameters using arcpy.GetParameterInfo() and then use the value or valueAsText parameters as needed. For example, a drop-in replacement for the first line of your sample is:

proximity_threshold = arcpy.GetParameterInfo()[1].value

MGAL

That's what I thought too...

When I change the line to...

proximity_threshold = arcpy.GetParameter(1)
arcpy.AddMessage(proximity_threshold)
arcpy.AddMessage(type(proximity_threshold))

if near_dist < proximity_threshold:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: '<' not supported between instances of 'float' and 'str'

Messages before the failure show 10, and <class 'str'> respectively. Here's my tool parameter config for good measure.

-M

abaldenweck@blm.gov_BLM_EGIS

Yeah just use arcpy.GetParameter()

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