Latest Contributions by Zeke

‎05-08-2012

Well, where is your feature getting it's color from? You're symbolizing by something, whether the whole feature class or shapefile has one color or different features in the feature class/shapefile have different colors. If you're using one color for all features, then just select all the records in that feature class. That's probably not what you want, so you're symbolizing different features in a feature class with different colors based on values in one or more attribute fields. You'd select red, blue, green, etc. records using the same criteria to you use to symbolize them. Afaik, there's no way to select directly on the color itself. The color isn't part of the feature class or the feature itself. Maybe you could do it in Python by checking the RGB values, I don't know. I suppose you could add a field called Color, give it the text value 'red', 'blue', etc. and select on that, but that's still an attribute selection and a poor way to go about it. A .lyr file retains the symbology, but I still don't know how you'd select by color. I apologize if I misunderstand your question, but I don't see any way short of possibly some kind of script (and don't know about that) to do what I think you want. Maybe there is a way and someone else will jump in with a method.

‎05-08-2012

I don't know if you can select by symbology. Why not just select on whatever attribute the symbology is based on? For example, if your symbology has a field Voted for states that voted Republican red, Democratic blue, other parties green, and you want to select all red states, just select for Republican in the field Voted.

‎05-07-2012

I added COGO fields to a line feature class table in a file geodatabase in ArcCatalog, and then used the Traverse tool on the COGO toolbar to create a parcel. But whenever I do this, I get the error below when I click Finish on the COGO box. This happens with every parcel. If I delete the COGO fields, it works fine. Any ideas on how to fix this? I didn't find anything searching support. Thanks. [ATTACH=CONFIG]14143[/ATTACH]

‎04-28-2012

If you're going to have a lot of elifs, sometimes it's easier to make a spreadsheet,txt or csv file with the data and join it to the existing table based on the common field, CO in this example. You can then either leave the join or export the whole thing to a new feature class or shapefile.

‎04-20-2012

Thanks all.

‎04-10-2012

This is a generic type question, no specific problem involved. What is good practice in deciding when to use del in a script? For example, I use it when done with a mapping.MapDocument object, but some of the Help files in the Resource Library seem to use it on variables as well. I don't see the point of that, but not a python expert either. Is there a guide to when you should use it? I looked at the Python documentation, but it was kind of obscure to me, especially when the documentation contains statements like "Rather than spelling it out in full details, here are some hints."

‎04-10-2012

Thanks, appreciate it.

‎04-10-2012

Thanks Bruce, that works great. I thought I had tried the escape \, but guess not correctly. How would this work for a variable, fld in the code snippet? Even though I don't expect the field name to change, I don't like using hard coded values if I can avoid it.

‎04-10-2012

I'm trying to set up a definition query for a layer, but can't get the formatting correct. I've tried several variations of the code below w/o success, such as writing the query out in triple double quotes (which for some reason required an extra double quote) . Appreciate any help. This kind of thing was easier in the old days of VB & VBA. Code: case_number = arcpy.GetParameterAsText(0) fld = "Case_" # tried substituting this for "Case_" in the line below, for example. query = '"%s"' + " = " + "'%s'" % ("Case_", case_number) #1st %s is single, double, double single quotes; 2nd is double single single double # query should look like "Case_" = 'A-BC-12-34' where case_number = A-BC-12-34, Error: <type 'exceptions.TypeError'>: not all arguments converted during string formatting

‎04-09-2012

What do you mean by 'select a file on disk'? Select it in Windows Explorer? Don't you just select features either manually with the Select tool, or with a query from the Selection menu, from the attribute table dropdown, or via arcpy? Guess I've just never run across that term.

‎04-09-2012

Well, that's odd. When I run the buffer tool in arcpy, it only runs on selected features. Are you using ArcGIS 10? Shapefiles or feature classes? How many features does the selection tab in the TOC show selected? If you're selecting the features in arcpy, try selecting them manually before running the buffer to see if that makes a difference. Or vice versa.

‎04-08-2012

I'm not sure if you can check the box, but I believe most tools, including buffer, only run on selected features, if there are any selected. I think the actual dialog box has the checkbox selected by default; either that, or it's an option or uses the last checked/unchecked status. Mine's always checked, so not sure.

‎04-05-2012

Thanks. I didn't think that would be necessary using the variable from a parameter, but very helpful to know.

‎04-05-2012

I've looked everywhere I can think of for a solution, or at least similar problem, to this but can't find one. The script gets a user entered value via GetParameterAsText(0). The value normally contains '-' characters, a typical one taking the form Z-FY-12-34, for example. When I try to set a text field to this value, CalculateField apparently treats the value as a number, subtracting the numbers and discarding the letters; the value then gets set to something like -46. I'm not sure it actually subtracts, but it always returns a - followed by a number. Whenever I check the value in the script, it looks correct. I'm guessing that maybe this is related to using r to accept a raw string, but I don't know how to do that with GetParameter..., and maybe that's not the actual problem anyway. Any ideas on what the cause is and how to fix it? Thanks. case_number = arcpy.GetParameterAsText(0) # user enters Z-FY-12-34 . . . fc = "Cases" fld = "Case_" arcpy.AddMessage("Adding Case number " + case_number + " added.") # case_number = Z-FY-12-34 try: arcpy.CalculateField_management(fc, fld, case_number) # field value set at -124 or some other number arcpy.AddMessage("Case number " + case_number + " added.") # case_number = Z-FY-12-34 except Exception as e: arcpy.AddError("Error setting Case_ field value to case number. \n" + e.message)

‎04-05-2012

Thanks, I'll try that. Surprised I didn't see it myself. Maybe I should actually look before I just copy & paste... 😉

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Date Last Visited	‎12-12-2021 01:00 PM

My Ideas

Latest Contributions by Zeke

Re: Select by color

Re: Select by color

COGO finish error

Re: Python code to create a field based on another field. why is this not working?

Re: When to use del - generic question

When to use del - generic question

Re: String formatting ? for definition query

Re: String formatting ? for definition query

String formatting ? for definition query

Re: Select by Location - "Use Selected Features" Check Box

Re: Select by Location - "Use Selected Features" Check Box

Re: Select by Location - "Use Selected Features" Check Box

Re: GetParameterAsText using 'r' like raw strings?

GetParameterAsText using 'r' like raw strings?

Re: Check if any features are selected

Conditional formatting for cells in a layout table...

Re: Change Legend Item names

Re: Keep labels in layout frame in map series

Keep labels in layout frame in map series

Re: Append not working