Questions tagged [calculate-values]
The calculate-values tag has no usage guidance.
60
questions
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37 views
Calculate ID based on ID from another field
I have a layer with single lines and I have added a unique ID for each line. I have extracted the vertices of these lines to a new point layer and now I want to add a new ID for every point but based ...
0
votes
1answer
27 views
How to write it on ArcGIS Raster Calculator?
I just started using the Raster Calculator, so I don't know how to build the formulas.
How can I do this?
I need to write both of these formulas:
D = is a raster file called "Slope_2"
P = 13
0
votes
1answer
39 views
Using IF-THEN-ELSE with ModelBuilder of ArcMap
I have two optional parameters in my ArcMap model (City and date) and I want to use the tool calculate a value to create an expression that will give me a boolean (true-false).
I want the code to ...
1
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0answers
19 views
Help with “Calculate Values” Python expression (ModelBuilder)
I have a model and need to compute a new value from two other values upstream, and then feed the new value to the Kernel Density tool.
Here is the formula I am trying to reproduce in the "Calculate ...
0
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1answer
32 views
Error with equation in GEE
I'm trying to calculate values for a raster I have based on other raster values.
The problem is that I get the error:
-0.054.multiply is not a function
and I believe it is because I'm writing ...
4
votes
2answers
74 views
How to calculate and export tasseled caps from MODIS collection in GEE?
I would like to calculate and export the brightness, greenness and wetness tasseled caps for the MODIS MCD43A4 V006 collection based on the Lobser coefficients, but I have no idea how to do it.
var ...
2
votes
1answer
51 views
Saving calculated fields to reuse in other QGIS projects
I am using QGIS 3.4.
I want to make attribute tables with many calculated fields that link to styles, and reuse the same structure for many projects.
For example, when I draw a pipe (line vector), ...
2
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0answers
34 views
QGIS 3.10: Evaluate default values (data source preference) not staying checked on?
Anyone having trouble with "evaluate default values" in QGIS 3.10.1 preferences, under "Data Sources"?
When I click the check box and then "OK", I go back to preferences it's unchecked! And default ...
2
votes
1answer
38 views
Determine distance between two polygon with having unique id
I have two polygon feature class one is Source Data and other is shifted data. I want to calculate how much polygon shifted (distance) using ArcGIS 10.6.
7
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3answers
393 views
Use field calculator QGIS: if value in one column, then value in new column
I am having troubles using the field calculator to get what I want.
One column in my attribute table is named 'Taxa' and has a set of species in it. Species are separated by #.
I want to make a new ...
0
votes
1answer
42 views
Color grid if values in grid exceed threshold - species distribution in QGIS
I have distribution data of a set of species (plants, mosses and lichens: 13 species total) in the Netherlands.
I made a grid that divides the Netherlands into 1x1 km squares. I am not interested in ...
1
vote
1answer
40 views
Code to return false if two preconditions are false in Modelbuilder
I'm trying to use Calculate Value in Modelbuilder's Arcmap to run a process if one of two booleans preconditions is true. So if both of precondintion are false the process shouldn't run, otherwise it ...
7
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2answers
243 views
QGIS 3.4 calculate date, add month
I want to add a number of months to a date to get a new date. I have a date-field "date", an integer-field "months" and a date-field "new_date". I want to calculate the "new_date" by adding the "...
0
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0answers
37 views
Seeking arcpy.SetParameterAsText equivalent in ModelBuilder?
I know it sounds weird, but I would need a tool made with ModelBuilder that output two parameters:
a layer
a message (a string)
The constraint derives from the need to share it as a Geoprocessing ...
3
votes
1answer
47 views
Calculating field while dissolving
I have two polygon Layers, A and B correspondingly. The polygons of B are lying on top of layer A and also overlapping the polygons of A (I made an example of the attribute table for better ...
1
vote
2answers
42 views
Adding time to variable using Python Parser of ArcGIS Calculate Value tool?
I am using Python 2.7 in calculate value in ModelBuilder. I want to query both 30 seconds before and after the variable. The original value keeps returning not the time change. What am I not defining?
...
1
vote
1answer
177 views
NameError: name '**' not defined in ModelBuilder Calculate Value
This question follows up on Crianopa's answer https://gis.stackexchange.com/a/107687/126329 - I am attempting to do just this, but my model fails at the Calculate value stage. Using the expression ...
0
votes
1answer
83 views
Wrong masked pixels
I am new in GEE, and tried to run a simple code to mask cloud pixels. However when I added the image selected with my filters I saw that the result of the cloud filter are empty areas, as shown below:
...
0
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3answers
108 views
Model Only calculate value with zonal statistics as table
In a precedent post Multiple Output for Zonal Statistics as Table I was trying to have as many table in the output as the rasters in the input. To overcome my errors, I decided to add a "Model Only ...
-1
votes
1answer
33 views
Using Field Calculator for subtracting values with same ID in ArcPy? [closed]
I have a line shapefile that used for some calculation.
One of the calculation is subtracting values with a same group ID.
The shapefile has a filed called LineID that consists of 2 lines with Side 1 ...
3
votes
1answer
96 views
Calculating acreage as a percentage in ArcPy
I am struggling to calculate the acreage as a percentage in Calculate Field Management, but I am getting this error message:
"ValueError: could not convert string to float! BufferAcreage!
arcpy....
1
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1answer
30 views
Add and Calculate Fields of Iterated Annotation Classes
I'm have difficulty with my script Arcmap v10.5.1. I get a syntax error on line 8. My question is: Can I calculate the Added field from an existing field within an iterated value? If so, what's my ...
1
vote
1answer
36 views
Finding calculate value or collect values tools?
I am using ArcGIS Desktop 10.5.1 and I need to use the calculate value tool or collect values tool to in ModelBuilder, but I cannot find those tools.
Do I need to download them from somewhere else?
1
vote
1answer
158 views
Inherited values between polygons in QGIS? [duplicate]
In this project, I have three polygons, see the image below
"Polygons_From", includes input attributes, i.g. "Value_1", "Value_2", "Value_3", and $area for each quadrate (on the image there are two ...
1
vote
1answer
282 views
How to automatically get/assign contour height attributes?
I have quite a simple problem yet I can already guess the solution is going to be pretty complicated.
I'm using QGIS and was wondering if there is a simple way for the computer to automatically assign ...
1
vote
1answer
406 views
Calculate percentile value of raster
I want to set null all raster values that fall below the 75th percentile value. E.g. If you classify the raster by quantile method into 4 classes I want to be left with the top 25% percentile. For the ...
0
votes
1answer
115 views
Calculate new Lat/Lon from initial Lat/Lon plus Cartesian X,Y [duplicate]
For small distances (below 10 km), assuming Earth is flat and I have initial Lat0/Lon0 and I have X(km), Y(km) distance From Lat0/Lon0, how can I calculate new Lat/Lon for the added X,Y?
0
votes
2answers
301 views
Reclassify a raster in R based on two rasters with the output containing over 1000 bands
I am trying to convert the outputs of a model into a raster based on both a temperature raster and a seasonality raster. I have over 2100 bands so ifelse statements aren't going to cut it.
An example ...
0
votes
1answer
60 views
Converting string to float in Calculate Value for ModelBuilder?
In ArcMap 10.2 I have created a nested model where I am iterating through some feature classes in order to get the minimum value of a specific field for each of them and then collect the outputs using ...
0
votes
1answer
198 views
How to determine the average NDVI value of a selected area?
I'm new to ArcMap 10.2 and trying to get NDVI data of city centers.
So my problem is, after I'm calculating the NDVI and getting the result raster, I would like to get a mean (average) value of ...
-2
votes
1answer
124 views
Calculating wetland coverage/overlay over parcels of land? [duplicate]
I have two layers. Layer 1 has features that are property/parcels with area in acres. Layer 2 has features that are wetlands/bodies of water with area in acres.
I want to calculate the percentage of ...
3
votes
1answer
232 views
Calculating weighted values of field in Attribute table in QGIS
In QGIS in the Attribute Table, I have a field with values.
For this field, I need to calculate the Sum of all its values and divide by the number of values that are not equal to "NULL".
Afterwards, ...
3
votes
1answer
1k views
Replacing Negative values with “0” for raster layer
I am trying to change negative values (raster layer) into "0" but I cannot find a way to do that.
Does anyone know how to accomplish it in QGIS 3.2?
I found an answer somewhere on the Internet to ...
2
votes
1answer
70 views
Calculating partial distances from whole segment in grid using QGIS?
I am using QGIS and trying to find a way to calculate partial distances of lines in a grid.
In the left part of the picture you can see the sum of the line lengths within the grid cell (108.96...), ...
0
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0answers
147 views
Zonal Statistics As Table with Very Small Polygon
I was given one single band NDVI raster and a shapefile with multiple very small polygons.
The raster has a resolution of 3m. On the other hand, the small polygons on the shapefile are square shaped ...
2
votes
1answer
4k views
How to calculate the polygon area and create a column of results in R
I'm working with shapefile in R and I need to calculate the polygons' area that I created by Gdiference function, So ,now I need to create a column with the size of freshly polygons created, because ...
1
vote
1answer
61 views
Updating Field using similar Field w/ Update Cursor: Field does not populate
I'm pretty new to scripting with Python.
My code is intending to iterate through a list of feature classes within a GDB, creating the fields EF_Type and EF_Group, then calculating the field. The ...
0
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0answers
61 views
How to edit attribute with my result from the count
I need this to loop through all the OBJECTID for the Fitting layer. Then it get the count for every line feature touching it. Now I'm at the point where I need the attribute table to be edited with ...
2
votes
1answer
289 views
Calculate mileage river network
We have a river network which doesnāt correspond to the reality shown by the orthoimage. Each river has the same route number (see attribute table). Every route number has several segments (see ...
-1
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2answers
937 views
Delete Rows in Qgis using Field Calculator [closed]
I tried to delete all rows where Field "Width" has value 2?
-1
votes
2answers
2k views
Using Calculate Field, how do you make one field equal another, existing, field? [closed]
I have two columns in a feature class. One has null values, the other has values. I want the one with values (TEXTSTRING) to be placed into the one without (HouseNumber). I know this is simple, but I ...
0
votes
1answer
261 views
Weighted average of areas within zones
I have a fishnet that defines my zones for my analysis, and am interested in the area of different hydrologic soil groups (A, B, C, D) within these zones. Each soil group has a corresponding score (1, ...
2
votes
1answer
1k views
when given bearing, angle, and distance, how to find change in location in 3d
I am helping a drilling team find the surface location representing a point in the ground. I am given the following values:
surface location latitude and longitude
Drilling depth (length of drill ...
9
votes
2answers
843 views
QGIS calculate radius of an arc to attributes
I have QGIS 2.18.16 installed.
My problem is, how to calculate radius of an arc / curve feature (line)? The lines are originated from .dgn file, which I read with FME and wrote to PostGis DB. I have ...
1
vote
0answers
528 views
Standard Method to calculate Average Moving Speed from Times & Coords?
...I wasn't sure if this question was best suited to GIS, SO or Math, so after reading GIS Topics I decided to ask here, but I'll relocate if necessary... :-)
I'm working on automating various ...
2
votes
0answers
52 views
Calculate side of a polygon that touches another feature [duplicate]
How can I measure the length of the side of a polygon that touches another feature (calculate from A to B on the image below)?
I'm creating and measuring lines to figure out the lenght of the '...
3
votes
1answer
208 views
Calculating sequential values in ArcGIS Desktop?
Previous posts (such as Adding automated values to attribute field?) answer how to calculate sequential values in an attribute table. The posts all seem to rely on the process described in this ESRI ...
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votes
2answers
89 views
Calculating acreage within county boundaries of a Raster file
I have a vector shapefile containing all of a state's counties. I also have a raster file with the statewide crop land use.
I need to calculate, for each individual county, the total acres of ...
9
votes
3answers
2k views
How to calculate total PV potential of a roof using QGIS?
I want to calculate total PV potential of a roofs in a certain area. To do that I made a dsm, ran SAGA "Potential Incoming Solar Radiation" algorithm (just playing with it only for now - I need to ...
3
votes
1answer
404 views
Using the field calculator in SAGA-GIS
I am working with SAGA-GIS and need to create an euclidean allocation raster. For this, I need to first create an integer raster with values for certain areas. This integer raster shall be based on a ...
