The Field calculator in ArcGIS-related products can recalculate the values of a single field on all or selected records within a table based on a symbolic expression in a programming language.
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How to fill inn A, B, C …Y, Z, A, B, …Y, Z, A, B, and so on? [duplicate]
as a second part of a problem i am trying to solve. I need help to figure out how to fill in serial letters.. Starting at A.. going to Z and starting over at A again.. I have a tabel with numbers ...
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How do I fill in serial letters (AA, AB,AC…,BA,BB,BC…ZZ) to a shape?
(I am using ArcGIS software, ArcMap...)
MY PROBLEM
I have a shape file containing points. The shape file contains 3 columns named FID, Shape* and Label. In the column I want to fill in AA, AB, ...
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1answer
63 views
How to calculate polygon areas in acres or square miles instead of feet?
I have a layer in State Plane NAD83. When I use "Vector|Geometry Tools|Add/export geometry columns" or Field Calculator they both create the area in feet. What if I want acres or square miles? Thanks
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3
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2answers
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Replace non-English characters in attribute tables
I have a few shapefiles where some of the attributes contain the non-English characters ÅÄÖ. Since some queries doesn't work with these characters (specifically ChangeDetector), I tried to change them ...
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2answers
50 views
How to get a string from a Double with a fixed number of decimals?
I have a featureclass (in a File Geodatabase), with a particular field of type Double. I want to copy it over to a text field, so that only 3 decimal places are shown.
For example: 34.78902345 ...
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2answers
74 views
Capitalizing The First Letter Of Each Word In Attribute Field
Does anyone know of a way to capitalize the first letter of each word in a field in an attribute table? I am doing this in QGIS. I know of field calculations to change all the words to Lower or ...
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0answers
19 views
Exporting QGIS attribute table to excel [duplicate]
I have a million rows in the attribute table, with lat/lon columns that I want to export to Excel. Selecting all the rows causes QGIS to crash. Is there another way to do the export?
The million rows ...
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1answer
78 views
How do you calculate a column value based on the value of another column?
I am trying to select data based on whether it starts with certain characters and then update a field. For example if [Asbuilt] starts with "WL" then do something. Here are the two methods I have ...
3
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1answer
124 views
Calculate area within Python script in Arcmap
I am trying to calculate the area of a polygon within my Python script. I create a new polygon from merging two together, and I'd like to add the area of the resulting polygon to a field in the output ...
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2answers
68 views
area values determined with field calculator become null when saving
using field calculator in Qgis 1.8.0 to get the area, it shows just right at first but when I save it, the values become Null. help please
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1answer
126 views
Why does Field Calculator return 0 values when decimals are expected?
I realize I posed this question, and got answers, several days ago (see (Field calculator error)) , but none seem to really be working, and so am posing again.
Below are two screenshots that show the ...
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3answers
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Field calculator error [duplicate]
NOTE: This problem is similar to one that was answered here: Why does Field Calculator return 0 values when decimals are expected?
I'm relatively new to python, and am trying to run a simple field ...
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2answers
65 views
QGIS Field Calculator Results Removed When Saving Edits
Mac OSX 10.6.8 QGIS 1.8.0 : Using the field calculator from the attribute table, the $area of each feature is shown nicely in the table until I try to save it, then all the values are replaced by NULL ...
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0answers
34 views
Replace Null Values Field Calculator [duplicate]
I am using ArcGIS 10 and have a polygon shapefile in which many of the numeric fields are Null.
The polygon shapefile in question is produced by joining a polygon shapefile with a point shapefile and ...
2
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1answer
131 views
Am I over-complicating adding and then calculating fields? Suggestions for a better way? (Python)
I'm attempting to re-position a question I asked yesterday here. I am starting to think that the way I wrote my code just isn't the best way. Am I overcomplicating things?
I know for a fact that ...
