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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Moving “last name” from last to first in Attribute Table of ArcGIS Desktop?

How do you get e.g. "John D. Doe" to "Doe, John D." in the AT using VB Scripting without going individually going through each line? I am using ArcGIS 9.3. I should note that not all the names are ...
4
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1answer
1k views

VB scripting in ArcGIS Field Calculator?

In my attribute tables field I am trying to get rid of the "&" in between names i.e. "John Adams & wife" and want it to say "John Adams and Wife" in all the attributes with "&". What is ...
0
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1answer
89 views

How calculate sequential values based on group field?

In field calculator i calculate sequential values in field [ORDER_ID] What need change in script to calculate sequential values based on group field [GROUP_ID]. I select values manually and use ...
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0answers
63 views

Replacing Null values with field calculator

My goal is to use the field calculator to replace null values. I am trying to replace nulls in the ToDate_Time with the FmDate_Time. When I run the code below the results window says that it worked ...
3
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1answer
43 views

Help with Rastercalculator - Filter areas with a certain height difference

I'm struggeling a little bit with the rastercalculator tool of QGIS. At the moment I am working with a DSM and a DTM. My aim is to filter all wind turbines out of the DSM and replace it with the ...
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3answers
197 views

Using Field Calculator to compare two fields in att table and returning if equal or not in ArcGIS for Desktop?

Using 10.2.2 I am attempting to compare two fields in an attribute table using the Field Calculator. I'd like to return a value of '0' if they are equal and a value of '1' if they are not equal. ...
2
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1answer
72 views

Reproducing GRASS GIS network analysis tutorial in QGIS Field Calculator

Im looking to reproduce the assigning of road speeds as denoted in a GRASS GIS tutorial (v.net.alloc tutorial), where the road speed is assigned by road type (i.e. 'interstate' = 75 mph etc.) to then ...
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1answer
5k views

Using VBA in ArcMap field calculator?

I am trying to use ArcMap's Field Calculator to populate values in a column based on a value in another column. So, in pseudo-code: if [field1] = 'Foo' set [field2] = 'Bar' endif Something like ...
2
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3answers
269 views

How to get around “The field is not nullable” error?

I have a shapefile of lines. I want the angle of every line calculated in a field. I am using the script below in arcmap, but when it encounters a line that is horizontal, it stops calculating any ...
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1answer
70 views

Copying some values from several columns to another column in attribute table? [closed]

I am trying to copy selected values from several columns to one single column in the attribute table. Specifically, where columns (Grid_code, grid_code1, grid_code2.... etc) have values of 4 and 10, ...
0
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1answer
75 views

Calculate percentages with field calculator in arcgis?

I am trying to calculate the percentage of each the area of each polygon in the selected area. I tried using ( math.fsum(!shape.area!) / !PolygonArea! )*100 and other codes but I cannot make it work. ...
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2answers
140 views

Update multiple fields/columns in QGIS

I need to update fields in attribute table of a vector using QGIS. I use field calculator for each field, but i have too many fields (and too many vectors also) and i need to program the task. The ...
0
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2answers
35 views

update cursor based on location

I'm working on a python script for ArcGIS 10.2/10.3. What I want is to automatically fill in a field of a point layer based on the location of that point in relation to a polygon layer. Say I have a ...
2
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1answer
748 views

Getting First and Last Point coordinates of Polyline with Field Calculator in ArcGIS Desktop?

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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0answers
11 views

How to calculate area percentage from polygons from one shapefile within another? [duplicate]

I'm working on a project where I have to create python code that takes land-use data and adds a percentage field for each land-use category in a Census Tract shapefile. I've been trying to work with ...
5
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5answers
4k views

ExecutING SQL script in ArcGIS field calculator?

I am trying to transfer over row data from a table to columns in a shapefile table. There is a common "SA" variable between the two (i.e. the study area number) but there is more than one land use ...
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1answer
25 views

Clearing Calculate Value before Model Run in ArcGIS ModelBuilder?

I am using ArcGIS 10.2 for Desktop. I have a model which contains several branches, which branch should run is based on the results of an earlier stage in the model. If the first stage of the model ...
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2answers
80 views

Using nested If statement in Python parser of ArcGIS Field Calculator?

I'm trying to use field calculator to assign values to a new field I created. I wan't to assign the value from the first field unless that field is empty, if it is empty use field 2, if that is empty ...
4
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2answers
455 views

Changing default parser in ArcGIS Field Calculator to Python?

Is there a way to change the default parser in the Field Calculator to Python? So annoying to always change now that I'm trying to move away from using VBScript... I'm using ArcGIS 10.1 for ...
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2answers
57 views

Iterating field calculations in arcpy

I was successful in adding multiple fields but had trouble running multiple field calculations in a loop. Now what I want is loop through these existing fields listed in mult_fields variable and fill ...
1
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1answer
37 views

QGIS field-calculator: set attributes to 1 if country name is in a list of values

In a country table, I create a region field, ECOWAS, with 1 if the country belongs to the regions 'ECOWAS', 0 else. Country names are in the field "sovereignt". How can I build a field-calculator ...
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2answers
121 views

Replicating Summary Statistics tool with case field using own calculation within ModelBuilder?

I thought this would be a simple problem to solve, by my googling hasn't provided the answers so far. I have created a near table (Using the 'Generate Near Table' in Arc) comparing two sets of ...
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3answers
6k views

Field Calculator syntax?

I can't get the syntax correct for a fairly simple if statement. Right now it looks like this: dim Output as Integer If [HECTARES] >= 30 AND [HEIGHT] >= 17 AND [CROWN] >= 59 THEN Output = ...
6
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1answer
3k views

ArcMap Field Calculator syntax (again)

I'm trying to string together a field calculator script that will populate all the records of a field at once based upon values in a number of fields. I can't even get the first part of the command ...
2
votes
1answer
4k views

Receiving error 000539 from CalculateField_management?

I am trying to add (ie "Author", "LastUpdated") to feature classes within a gdb and then populate each of those fields. I have been able to get my code to run properly for the numerical field but I ...
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1answer
345 views

Debugging error 000539 from ArcGIS Field Calculator?

What am I doing wrong in this field calculator logic? Pre-logic def re_score(elev_t,f2, contour): f2=contour if elev_t.endswith('.5'): f2 = "Midi" return f2 Expression for field "Contourtyp" ...
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1answer
150 views

Using Function in Field Calculator gives error 000539?

I'm trying to populate a field using a function. When I run this in Pyscripter, it works fine: d = {} # Function # def find_dups(val): d[val] = d.setdefault(val, -1) + 1 return d[val] # ...
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1answer
43 views

Field calculations and existing domains

I have feature layer which needs to be updated with new attribute information. The text field I need to populate already has an established coded domain. I need to update hundreds of records and don't ...
3
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1answer
5k views

Setting value of field in all selected rows of table using ArcGIS Desktop?

I have an attribute table in ArcGIS 10 (it's large - around 300,000 elements). I've selected some rows of the table using 'Select by attributes' and I want to set the value of a field for all of those ...
7
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1answer
1k views

Editing tables using SQL in ArcMap [duplicate]

We've recently started working with ArcMap, having used MapInfo previously. I've created a shapefile in ArcCatalog and want to update some columns using SQL. In MapInfo I'd write the following command ...
0
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2answers
467 views

What is expression for finding perimeter in ArcPy and Field Calculator?

What is the correct format for finding perimeter as an expression for arcpy. I was able to use expression !shape.Area! to find the area of my polygon. However when I use the expression ...
2
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2answers
60 views

Sequential attribute field calculations with null values using Arcpy

I have a series of x,y co-ordinates converted from a .ply file. I was able to extract the file into a suitable x,y format for arcmap, the issue I have is that they are co-ordinate points representing ...
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0answers
64 views

Converting UTM to Lat Long inside a Game Engine(Untiy 3d)

This is my first post on Stack Exchange. I have exhausted my research through the game engine forums, so I am trying this forum since you guys seem to be the experts. I have an external device that ...
1
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1answer
56 views

How do I round the coordinates of a point before insert into attribute table in ArcGIS?

Until now I doing the following steps to get rounded coordinates: create a new x and y column in the attribute table use Calculate Geometry round the column value with the Field Calculator using VBS ...
0
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1answer
68 views

What expression needed for universal naming of parts polygon feature class?

For example, i have n count of polygons and little parts of it. I want in field [Name] get string: "PNum1(1)". where "1" - number of main polygon [Num], "(1)" - number of part of main polygon ...
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1answer
78 views

Spatial join multiple attributes from smaller polygons to the bigger one

I'm trying to join (to the rectangle) values from multiple polygons intersecting for this rectangle. I've tried to use some Reference functions in Field Calculator like geomintersects() but it joins ...
1
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1answer
45 views

Referencing external CSV file within ArcMap field calculator using python codeblock?

I would like to know if there is a way to incorporate an external csv file into a custom made python script in ArcMap field calculator. I am inputting fields from the current layer, but need to access ...
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1answer
71 views

Adding Rasters with multiple Field Values using Map Algebra in ArcGIS for Desktop? [duplicate]

Embarrassed that I haven't looked at this for some time (can't quite get the syntax down). (ArcGIS 10.2, Win7x64). Within Map Algebra (Raster Calculator) Trying to add the cell values of 3 rasters, ...
2
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2answers
199 views

Randomly choosing one from multiple fields in Field Calculator of ArcGIS for Desktop?

Using the Field Calculator in ArcGIS for Desktop, I want to randomly choose one field from a list of 10 fields (strings). The Excel equivalent, which is working, is: =INDEX(A2:J2;rnd()*10+1). How ...
1
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1answer
214 views

How to convert text to proper case using the field calculator?

I am working on a set of data that has over 40,000 records on ArcGIS and I want to use a Proper Case for several fields/columns on the table. Is there a Python or Java Script that can help me automate ...
2
votes
3answers
147 views

How to calculate Statistics of an attribute field to use it in another calculation

I want the statistics of an attribute field to use in another calculation, i can view the statistics using the field properties menu I want these to normalised the data of field 'Ia' using the ...
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1answer
50 views

Capitalizing The First Letter Of Each Word In Attribute Field QGIS

I have tried capitalizing the first letter of each string in my field/column called "COMMUNITY" by referencing this post: Capitalizing The First Letter Of Each Word In Attribute Field Particularly: ...
7
votes
1answer
146 views

Filling fields with conditional clauses

I have four fields in my shapefile. I would like to fill only one of them (cell of attribute table) and automatically after to write one cell the others one will be filled by conditional clause. I ...
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1answer
31 views

Summarize multiple columns in field calculator [closed]

I am performing the Huff model with 10.000+ facilities and dwellings. As a result, each facility has a value between 0 and 1 that determines the probability a consumer patronages a facility from a ...
4
votes
3answers
223 views

Using IF operator with Python parser of ArcGIS Field Calculator?

I want to assign numbers to a certain types of building and I need to use field calculator. I tried many different versions of this and I still cant find whats wrong. Could you tell me where do I ...
0
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0answers
10 views

Replacing null values in cell with integer using Python parser of ArcGIS Calculate Field tool? [duplicate]

In one field I have certain cells that are filled with null values. I am trying to change all those null values to 0 or say even as random as 100. I tried with the Calculate Field tool the following ...
3
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1answer
47 views

How to convert a “yyyy/mm” field to “yyyy/mm/dd”?

I am trying to edit an existing date field of the form "yyyy/mm" to a format that the TimeManager Plugin for QGIS can handle - I guess "yyyy/mm/dd" will do it. I've got as far as opening the ...
3
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1answer
132 views

Field calculator uses wrong fields when working with joined data

I am having an issue in qgis table joins. i have a joined a csv file to a sqlite database and common id is used for join. the join is displays correctly in attribute table. the attributes in sqlite ...
3
votes
2answers
127 views

Arcmap field calculator python script returns no data

I am running ArcMap 10.2 I have 4 fields with which I am working. many have duplicate entries. in order to find the single correct entry from all the duplicates I am trying to calculate out the ...
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1answer
377 views

How to copy same values to another field in attribute table in QGIS using field calculator?

I am trying to copy values from Parsel_ID to Parsel_NO using an equation ( look at pictures) in field calculator but it is not working. What is the problem and how can I success this task??enter image ...