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.

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Conditional Calculate Field Many to One

Anyone have experience calculating a field based on a many to one scenario? I have a feature class in a geodatabase with a field of unique names. Feature Class Table (let's call this ...
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132 views

Using the Rule-based style to calculate each grid cell from overlaps

I am using the Rule-based styling properties (QGIS 2.2) to determine the colour of grid cells for a merged shapefile. Each grid cell defined by its ID may be overlapped by several layers as defined by ...
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4answers
1k views

Calculating acreage using ArcGIS Field Calculator?

What is the expression to calculate an acreage in USA ? I am aware that there is a geometry calculate but when you convert raster to polygon it doesn't do it's job and I have to use the field ...
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164 views

ModelBuilder - How to calculate Field using part of path name

I am trying to calculate a field using part of the feature class path name (specifically, the last three characters of the geodatabase name). Is this possible? I've tried using the parse path tool and ...
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54 views

If clause within if clause VBA Arcgis10

I'm using ArcGIS10. I do not know what's wrong with this VBA code in the Field Calculator: *All the fields are String type If [StartY] < [EndY] Then If [DOT_OSM] ="1" Then Output = "F" ...
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36 views

Filling Field2 to icorresponding values in Field1 of shapefile using Field Calculator of ArcGIS for Desktop?

I have to give explanation in a new field of the existing field which contains abbreviation. Example: Field "Geology" has values Q, Qs,N....(abbreviation), I have to give explanation of those in a ...
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3answers
131 views

ArcMap Change Values Greater than Standard Deviation of Mean to Zero

I have a feature class with greater than 1000 features and I would like to change all values greater than 2 Standard Deviations to a Zero. Seems like I could possibly use Field Calculator for ...
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398 views

Calculating the average / MEAN of an attribute field in a QGIS model

I need to know how to calculate the average / mean of an attribute field in my point shape file. Is this possible to do with the field calculator? I just found the options min or max but not mean. The ...
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1answer
355 views

How to get the First and Last Point coordinates of a Polyline with Field Calculator in ArcGIS10

I'm trying to get the First Point coordinates (x,y) and Final Point coordinates (x2,y2) from a polyline in ArcGIS 10 with the Field calculator. I've added 4 (double) fields like StartX,StartY,EndX ...
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1answer
2k views

Writing conditional (if/then) statements into Field Calculator of ArcGIS for Desktop using Python parser?

I have gotten stuck on another seemingly simple arcgis field calculator python expression. I obtained a great answer to a another similar question a few years ago: Python Field Calculator ArcGIS 10 ...
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1answer
373 views

Using Field Calculator to Add a Set Amount of Time to Date Field

I wish to georeference several photos to a track created using a Garmin Oregon 450t, but the time recorded in the photos and the time recorded in the .GPX are not the same. The format for the date ...
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2answers
148 views

How to compute percent of a field

I have a layer with a column conaining population values. I want to write an expression to compute in a new field the percentage of population each polygon has in relation to the total population. I ...
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1answer
75 views

Calculating average of 3 fields where nulls are present

I have created a new field to calculate the average of 3 other fields in a table where nulls are present. Using python as the parser(with no code block) I used this: (!Slope_PCT! or 0 + !Flood_PCT! ...
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2answers
237 views

Updating column in Field Calculator using values of another column?

I am very new to GIS, so I hope to get some help. I am using ArcGIS 10.2 for Desktop. I want to create a new numeric column on my attribute table to store "seasons" in numbers. For example, I want ...
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1answer
153 views

QGIS - Is it possible to increase Output Field Name?

When creating a new Column, the default value for the length of the name is 10. Using the Field Calculator via the Model Builder, I want to include the names of regional areas into the columns which ...
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2answers
344 views

Autoincrementing Python Script is over writing all fields versus just fields that are null

Using ArcMap and the Field Calculator I have a python script that should autoincrement the FacilityID field if it is null. It works the first time through but the second run causes it to overwrite ...
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1answer
236 views

Replacing attribute table entries using Python script

I am using ArcMap 10 from ArcGIS 10.2.1 package. I got an attribute table, with few collumns. I need to replace some column "String_A" entries with newer "String_B" entries, in the same row. In both ...
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1answer
2k views

Getting ValueError: max() arg is an empty sequence on a Python Script in the Field Calculator in ArcMap

I have a script that populates a FacilityID Field on a Attribute table in the Field Calculator but when I run the script below I am getting a error. EDIT: Python Script: def autoInc(): import ...
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1answer
127 views

How to calculate/record attachments' file names using Field Calculator?

I have a point feature class containing attachments corresponding to jpg files (sometime more than one jpg per feature). I would like to use the "field calculator" to calculate/record a new field that ...
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2answers
138 views

Comparing 2 fields using Python

I am trying to compare 2 fields(double) using python. I want to round to the nearest 10th and flag those with a "1" that are not equal. Here is what I have at the moment: def Qcontrol(old, new): ...
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1answer
57 views

Field Calculator extract three last digits from another field

How everyone! I have two fields the on is the cadastral number which is for example 051020213001 and I am trying to fill the other field (label) with the last 3 digits from the cadastral number, in ...
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3answers
92 views

Python QC field calculator

I am new to Python and am trying to run a simple QA/QC on a particular set of fields. I basically want to verify that fields x and y add up to z, I may have to incorporate rounding since a small ...
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1answer
433 views

How to use “this” Levenshtein Python code into ArcGIS 10

I need some help with this: First of all, I wanted to "Compare strings from two fields", and asking before at gis.stackexchange, in this post someone help me with this topic, referring me to a Python ...
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1answer
631 views

How to compare string fields in the same table with ArcGIS 10

I don't know exactly if there is a tool for this or a maybe a python script could be more suitable. I want to compare string elements from a field (POI_NAME) with another string element in another ...
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1answer
244 views

ESRI File Geodatabase with a field calculator with an incrementing number

I've got a python script that runs on the Field Calculator of a ESRI File Database. Right now it runs correctly in that it will increment the last three digits of the value. But this is a script ...
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2answers
119 views

How to include a quotation mark in a text field from field calculator

I'm trying to attribute pipe size and need to include a quotation mark in a text field. How do I include that in the field calculator. "4"" doesn't work.
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1k views

ERROR 000989: Python syntax error: Parsing error SyntaxError: invalid syntax (line 2)

I have a Field Calculator I am using with Python and I keep getting the above error. Below is the screenshot of my Field Calculator I am using. What am I doing wrong here?
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106 views

Use Python lists in Field Calculator?

I couldn't find this question, although I am sure it has been asked. How could I use a python list to condense this script? This code block currently works, but is clearly not very efficient. def ...
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1answer
240 views

Auto increment a new column using Model Builder Field Calculator in QGIS?

I am making a model which requires creating a grid and clipping various layers to it. Using the Create grid function does not provide an ID column, instead it creates 2 columns: "longitude" and ...
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1answer
290 views

How do I add a column in an attribute table using QGIS graphical modeler?

I have started to make a model in QGIS 2.2 graphical modeler. I have made a buffer around a polyline and used it to clip a polygon layer. So far i t works. But the next step is to add a new column ...
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1answer
172 views

Error when dividing a field with a number

Using arcpy CalculateField_management i want to divide a field with a spacific number: arcpy.CalculateField_management(EZG_shp, "IDX_AT_PK", "(!EURO_SUM!/!Anz_Pers!)/1668,4","PYTHON") This works in ...
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483 views

How to populate a text field with double quotes using field calculator

How would I populate a text field with double quotes using the Field Calculator. For example, I want to populate a field as 24". Is there a way to populate fields using the field calculator with ...
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1answer
47 views

same or similar search word with field calculator

I am using arcgis 10.1 I have two tables A and B need to find attributes of table B data are on the table A I'm doing a join between table A and B now I want to use the field calculator via a script ...
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1answer
170 views

Error when calculate field using VBscript or Python (slice a field)

I have an expression in VBscript that works well for labeling: Function FindLabel (field) if (INT(RIGHT(field, 2)) <> 1) then FindLabel = INT(MID(field, 8, 3)) &"-"& ...
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1answer
469 views

How to use %value% (from For iterator) in SQL expression of Calculate Field in ModelBuilder?

I have a shapefile with data of fish specimens and the coordinates where they were tagged for research purposes. One of the fields in the attribute table of these shapefiles is the fish length in ...
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1answer
171 views

QGIS: graphical-modeler to calculate area of polygons

I'm trying to calculate the area of polygons using the field-calculator in QGIS (2.0.1). If I do this manualy it works fine, but if I do this using the graphical-modeler I get NULL as area for every ...
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1answer
137 views

Replace characters

How to remove a special number of characters of a string, e.g. the last 7 characters? And how to join them as the first characters to the string of another field? Thank you for VBS and Python synthax ...
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1answer
56 views

How to use QGIS field calculator to delete style code?

I am struggling with following issue: How to delete style code before id codes x.x.xx.. and the }s in the end? Examples below. Any help appreciated! {\fArial|b1|i0|c0|p34;A.B.11} ...
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2answers
58 views

trying to add content to the middle of a string

I am trying to add content to the middle of a string by using MyStr = Mid([MyField], 1, 1) and I get an error. I've tried MyStr = Mid([_smallx], 63, 6) and MyStr = Mid(["_smallx"], 63, 6) The ...
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1answer
236 views

How to use Field Calculator to assign values to only Odd (or Even) page fields for Data Driven Pages?

I am creating a map book but do not want the page numbers for each map page to be on the same side (since its printed double sided), I need the page numbers to be placed on opposite sides? I am using ...
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3answers
2k views

ArcGis Python Script, Calculate Field

Sorry for my English. I am trying to write a Python Script for ArcGis 10.2. #import system modules import arcpy import math from arcpy import env #Set environment options ...
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2answers
1k views

How to use DateDiff() Function across day transition in ArcGIS Field Calculator?

I am trying to calculate the time difference between two fields using the DateDiff() function in minutes. I have successfully calculated the times that fall within the same day but I am having trouble ...
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2answers
365 views

Convert from Julian Date to Calender Date in Field Calculator

Does anyone know of a way to convert from a Julian date to a regular calender date in either QGIS or ArcGIS field calculator? Thanks...
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1answer
72 views

Arcgis 10 assign values to field based on values in other field [duplicate]

I have a table with two fields A and B, and i want fill field B with "some values" from field A: FieldA: 123456_CC; 123_D; 1234567_AB; 123456768_F I just need the "text" that is associated with the ...
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1answer
818 views

Why does Field Calculator say failure during processing, check geoprocessing results window for details? [duplicate]

I am using the Field Calculator and keep receiving the following error: 'There was a failure during processing, check the geoprocessing results window for details'. I am not very tech-savvy but I have ...
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1answer
174 views

Parsing field in field calculator using Python

I have field1 which has a values of "A_B" (example). I created two fields out of this, values to the left of the underscore go in fielda and to the right of the underscore go in fieldb. I used the ...
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1answer
2k views

how to use the TRIM function in field calculator

I need to remove leading spaces in a field in my attribute table, but not how to do it from the field calculator
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1answer
535 views

Using Python in Field Calculator to compare two fields

I'm trying to use field calculator to compare two fields in a table of tax parcel data, Land Value (LAND_VAL) and Improvement Value (IMPRVT_VAL). My goal is to determine (1) Parcels with land value ...
2
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4answers
223 views

Field calculator Python else statement question

The codeblock below is run on Field1 and calculates Field1 to equal Field2 if they are not equal. Else it returns Field1. My question is, does the else statement actually recalculate Field1 to equal ...
2
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2answers
104 views

What's the use of the buffer function in field calculator?

I'm trying to find out how the buffer command in the filed calculator works. I tried to create a new field to my point shapefile (integer) with the following: buffer ($geometry, 100) but no ...