Field calculators (available in QGIS, ArcGIS Desktop, etc) can recalculate the values of a single field on all, or selected, records within a table using an expression.

learn more… | top users | synonyms (1)

2
votes
1answer
94 views

Create list of [X, Y] coordinates within field calculator

Lately i've been working on a script that must calculate a value in ArcGIS field calculator based on all vertex coordinates of a polyline. But i am struggling to create a list of a polylines ...
0
votes
1answer
51 views

calculate specific rows and populate their result in another field

I'm working on ArcGIS 10 desktop version. I have a file with one entity entered multiple times (rows) and each time that has been given a new value against it. I want to sum the values against this ...
0
votes
1answer
34 views

Updating Values in FIelds of ArcGIS editing only portion?

I have total 96 records which are having duplicate values like 999999. What i want is to convert these values into unique ones like 999901,999902,999903 and so on, through the 96 records. I want ...
2
votes
1answer
98 views

Convert Field Expression to ArcGIS Python Script Tool

I've created the following field calculation that I'd like to convert to a python script tool: def blocklow(a, b, c, d): mylist = [a, b, c, d] # create list from input range variables if mylist ...
0
votes
0answers
49 views

Concatenation of fields with if or when circumstances

I have a field named PROJECT_DESCRIPTION that concatenates the STREET_NAME, FROM and TO fields. Sometimes the FROM or TO fields are only address ranges. In my PROJECT_DESCRIPTION field I would like to ...
2
votes
1answer
57 views

Selecting numbers within the slash (/) using ArcMap Field Calculator?

I have date data that I'm separating into three separate fields (all fields are string type, including the input field) by day, month, and year. Unfortunately, the date field is raw data and isn't ...
0
votes
2answers
114 views

Find minimum in a column of attribute table using python on Field Calculator

I have a column X in attribute table where the values are repeated in some lines. What I need is to make a condition that says: when the values in column X are the same, find the minimum of column Y ...
1
vote
2answers
59 views

Extracting a Feature Class' Name, and Adding It to a Field

I'm building a bike network dataset based on an existing street network. Each bike lane/route/path has a unique ID number (assigned by our engineering deparment) that must be included in a separate ID ...
0
votes
1answer
52 views

How to assign a new name for values selected from two columns?

I'd like to assign a new name (either HIGH, MEDIUM or LOW) to values selected from different columns in ArcMap 10.3 I selected the two values from the two columns ("MAIN_ROCK" and "SUB_ROCKS") using ...
1
vote
1answer
41 views

How to select different values from two columns through Select By Attributes?

I'm using ArcMap 10.3. I'm trying to select by attributes different values from two columns. I want to define the areas where Main rock is GRAVEL And Sub-rocks are : a. mudstone tephra loess b- ...
1
vote
0answers
55 views

How to create a sequential unique id by groups?

I'd like to use the field calculator in QGIS to create a unique feature (polygon) id that reflects different levels in a geographic hierarchy. So say I have a REGION attribute within which there are ...
1
vote
1answer
39 views

Calculate proportions of point counts per polygon based on threshold values

I have an attribute table containing "Joint_Count" and Raster ID (A1, A2, etc), where Join_Count refers to the sum of points per raster ID. If the sum of all Join_Count represents 100%, how do I ...
0
votes
0answers
24 views

Using ArcGIS field calculator to rank continuous field within shapefile using VBscript parser? [duplicate]

So have been trying to get the VBscript code below to work in the ArcGIS field calculator. The values are a continuous set of data between 15-88, and I have used the natural breaks jenks rank to rank ...
1
vote
2answers
69 views

Syntax error in parameter formula of field calculator funtion

I'm using a QGIS 2.8.1 in windows. Have some doubts with syntax when use string in python console. I want to use the field calculator funtion like: processing.runalg('qgis:fieldcalculator', input, ...
3
votes
2answers
126 views

Calculate QUARTER from Date field using ArcGIS Field Calculator?

I currently have a Date field in the format of MM/DD/YYYY. My goal here is to convert the Dates into 1 of 4 quarters, along with the Year. The field to be created will be called QTR_YR. My first ...
1
vote
1answer
41 views

Calculating field on insert (real time) using QGIS?

We use QGIS as a field application. We like to calculate with a input value and then also calculate with the result of the calculation Example: Liters: 1000 -> Liter per container: "this has to be ...
1
vote
1answer
63 views

Calculating XY in Model Builder using Calculate field

I'm trying to calculate the lat/long of a feature class in GCS NAD83. The picture shows what goes below. I can get it to work for distances and areas, but not a centroid. What looks incorrect?
5
votes
2answers
304 views

Way to find minimum value from a group of values - QGIS?

I'm wondering if there is a way to find the minimum value of a group within QGIS? Basically I need to find the minimum distance of each unique value in a table of about 5000 records. I can do the ...
1
vote
1answer
52 views

Debugging Indentation error on Python Parser of ArcGIS Field Calculator?

Would anyone please help me find out why I get an indentation error in line 3 def calc(f1,f2,f3): remove_list = ['01ST', '02ND', '03RD', '04TH', '05TH', '06TH', '07TH', '08TH', '09TH'] if f2 in ...
2
votes
1answer
63 views

Python codeblock to remove numeric characters from a column not working

I am trying to make use of a codeblock found in this thread: How to remove numeric characters from alphanumeric value in field calculation? I put this code into the pre-logic script field of the ...
1
vote
2answers
523 views

If/else statement in arcgis

I try to fill the fields with the condition if / else but it does not work. I do not know where is my mistake in the code. def TextValue ( !Classe! ): if !Classe! == "Steppe arbustive" or !Classe! ...
2
votes
2answers
55 views

type mismatch: 'esri_8' when using field calculator

I am trying to run the VBScript 'round' function using the field calculator on a column for a numeric field that contains a large number of rows (> 500k). When I run the code on a subset of the field ...
0
votes
1answer
90 views

Using Python for Field calculator?

I have problem with Field Calculator, using ArcGIS 10.2. I tried to write a statement but I don't know what is wrong. I have two columns: The first contains a number code. Every code represents ...
2
votes
2answers
68 views

Calculate Field using Fieldnames(variables?!)

the Question I have is kind of asked before. But I couldn't figure out the solution. ArcGIS 10.2.2 Python 2.7.5 I`m adding fields to a table using user input for the fieldnames. Then I populate ...
3
votes
1answer
76 views

Reclassifying a polygon using ArcGIS field calculator?

I am trying to reclassify a polygon into three classes: 1 and 2 = 5 3 and 4 = 3 5 = 1 I have been trying to do this by calculating a new field in the attribute table but I am very ...
2
votes
1answer
159 views

Copy first row of attributes and paste for each feature

In a newly digitised polyline vector layer, there are 7 columns attributes value that are choosen inside a value map combo-box that MUST be exactly the same for every newly digitised line (I choose ...
0
votes
1answer
97 views

Changing Date Format via Field Calculator of ArcMap?

I'm trying to find a function in the Field Calculator (preferably in VB Script) that can add numbers into a field that already has data. I have year data ranging from the 1960s to 2014 in string ...
1
vote
0answers
31 views

Linking Statistics Type with Calculate Field after Table Join using ModelBuilder?

I am attempting to build a model using ModelBuilder in which there is a zone statistics tool being run iteratively for a set of rasters. The input is a blank template table that contains the number ...
1
vote
1answer
82 views

Adding a sequential number using ArcGIS field calculator to string file and keeping the 0 in front of the number? [duplicate]

I want to know if anyone has a code to count +1 starting at a certain number for Field Calc. ArcGIS. (I.e. 04312, 04313) It also must keep the 0 in front. rec=0 def autoIncrement(): global rec ...
3
votes
2answers
128 views

Script (ArcPy) vs field calculator (Python Parser) behaviour of getPart in ArcGIS for Desktop?

From time to time I have to access geometry field and shuffle through points in it. Process is simple: Get shape Get it's part Iterate through part's points This is how it looks like in a script ...
0
votes
1answer
74 views

Using Field Calculator with Python Parser and if/elif statements in ArcGIS for Desktop? [duplicate]

I have tried all of below snippets to use Python Parser in Field Calculator and update the values of a field called type based on a filed called MamerMN but in all of them I am getting Syntax error in ...
1
vote
2answers
127 views

IF THEN statements in ArcGIS Field Calculator

I'm not sure if this would be best handled in vbscript or python, and unfortunately I'm less than novice at both so I'll take any help I can get from the exchange. I'm trying to take my streets layer ...
0
votes
1answer
43 views

CalculateField_management: Different results than in the field calculator

I`m using ArcMap 10.2.2 and Python 2.7.5 I´m tryig to calculate values with the CalculateField_management tool. my script: def mthree(mthre, mtwo): if mthre >= 1: return -3 if ...
0
votes
0answers
33 views

Added Field not showing in calculate field tool in modelbuilder

I am attempting to create a model that adds a field of the same name to multiple output feature classes, then calculates unique values for this field for each feature class. See the model below: ...
1
vote
0answers
29 views

Calculating full text string between two joined tables in ArcMap? [closed]

Using ArcMap 10.2.2, I performed a basic table join between a few of our electric feature classes to update the "Line and Pole" field with the attributes in the "Fuse Size" and "Fuse Type" fields. ...
0
votes
0answers
100 views

How do I calculate the travel time between patients and hospital by helicopter and make a map out of it?

I have a layer(.shp) with hospital location and a layer(also .shp) with pick up positions of patients by helicopter. The table with the position of patients has two columns, one with departure time of ...
0
votes
2answers
65 views

Finding and copying text with Field Calculator in ArcGIS for Desktop?

I'm trying to find every instances of an "Avenue #" in the Name field and have Field Calculator copy that over the single letter written in the Subname field so that both fields look exactly the same, ...
0
votes
1answer
44 views

Populate Integer Field based on Text Field

Using ArcGIS 10.2.2 In the picture below, I want to populate the Spd_Class field (short integer). The value of the Spd_Class attribute will be based on the TYPE field - residential = 30 secondary = ...
0
votes
1answer
81 views

Auto increment field that begins with text in ArcGIS

I am searching for a way to auto increment an ArcGIS field which begins with text and followed by numbers. Ex. SWCL0000. I have tried the auto increment code in the field calculator but once I added ...
1
vote
2answers
112 views

using field calculator on string field that has some empty values?

I have a CityState field that has the city and states of landowners. Bellingham WA, for example. I am making two new fields, OwnerCity and OwnerState in which I strip the last two characters of ...
1
vote
1answer
31 views

Field Calculator Mass Change Freezing issue, Any other options?

I have a list of ~2300 points, that i need to change a whole field's ("JointUse") attributes from null to "N" (for No). I've tried doing the basic field calculator change but I'm assuming since I'm ...
0
votes
1answer
57 views

Extract acres from legal description

I need to extract the acres from the legal description. I have tried "(!Legal!.split(" AC")[-1])" but it gave an error. I am using ArcGIS 10.2 using python in the field calculator. I realized why ...
5
votes
5answers
366 views

How to combine text and integers in a string field?

I have field with numbers in it (field type: double, number format: numeric) and I need to create a new field and put text in front of the numbers. I know that I need to add a new string field, but ...
1
vote
3answers
124 views

Lists in field calculator in ArcMap?

Would anyone please indicate to me why this is not working. I am trying to convert all instances of '02ND' to '2ND' for example where some of the input fields (f1) are already converted and some are ...
1
vote
1answer
132 views

How to calculate azimuth in QGIS field calculator?

Is there any way to calculate the azimuth of two points in the QGIS field calculator? The coordinates are stored in an attribute table. x1 | y1 | x2 | y2
0
votes
1answer
59 views

How do I move the last two characters of a column within the attribute table to another column?

I have data in a column that looks like the below example: El Monte CA I need to move the last 2 characters to a separate column. Which function in the field calculator will deliver those results?
1
vote
1answer
28 views

How to add the values of a common field to a field during union

If I have say 3 overlay features; A,B,C each has a field called FIELD_ID If I do a union, I will get 3 new fields in the output: FIELD_ID_1, FIELD_ID_2, FIELD_ID_3 But how do I get just one ...
0
votes
2answers
733 views

Using Python to field calculate Lat/Long with decimal degrees rather than meters

The below is a snippet of a python script that I am writing that basically adds two fields - Latitude and Longitude, then calculates them. I could use the Add XY Tool which gets me to the same point. ...
1
vote
0answers
50 views

Using ModelBuilder or Python parser of Field Calculator to check values between two datasets?

I have a *.dbf that I need to check values against for a shapefile. I need to report whether the values match the dbf in the shapefile and, if not, what the value should have been (in two new ...
0
votes
1answer
40 views

Calculate field value based on lat long. Have longitude values which are negative?

Very new to python, fairly experienced with ArcMap. I am trying to create an alphanumeric index based on point locations My code string for the numeric part is here: def calc(!LONG_x!): if ...