Questions tagged [calculate-values]
The calculate-values tag has no usage guidance.
104
questions
1
vote
1
answer
34
views
Defining "All other Values" in QGIS
I am trying to use the "Сategorized symbology" in QGIS. I am having a problem because some of the data I need seems to be in the "all other values" category when categorized.
Is ...
- 11
0
votes
1
answer
26
views
NDSI handling of areas that cross over a pixel
I am using GEE to calculate the NDSI on Landsat8 using a polygon area of 500m.
Since Landsat8 has a 30m pixel resolution, I wondered how the partial pixels are handled in the calculations.
Are they ...
1
vote
0
answers
44
views
Summing values from points of one layer within fixed distance to points of another layer [closed]
I'm working with QGIS 3.22. I have two layers of points (layers A and B), and I know how many points of layer B are within a fixed distance from each point of layer A.
I updated a field of layer A ...
1
vote
0
answers
77
views
Autofilling based of value map in QField
Is it possible to prepare a Value Map with autofilling? I have a list of almost 500 plant names and it is difficult to find correct name on my device (phone with Qfield) while scrolling. Is it ...
- 11
1
vote
1
answer
86
views
Using Inline Variable Substitution with optional Parameter in ModelBuilder
I am using ArcGIS Pro 3.0.3.
I have a model that is using inline variable substitution to pass a list of streets to my calculate value tool. This is an optional variable that is set as type Multiple ...
- 307
1
vote
1
answer
100
views
Calculating route kilometer (min and max) for intersection
How would you solve the problem:
Points with km values every kilometer
A route (f.e. railroad) als polyline
An area where you would like to know at what kilometers it intersects with the route (...
- 519
2
votes
1
answer
217
views
Calculate the minimum distance of a point grid from the nearest point of another layer with QGIS
I have a grid of 1 km points and a separate group of points representing RTK stations. (See image 1)
I want to create a 3rd value for the grid points that is proportional to the nearest reference ...
- 23
0
votes
1
answer
26
views
Iterating coefficient values using ModelBuilder
I want to obtain all the coefficient values using ModelBuilder in a dbf file.
I have managed to derive coefficient values but the issue arises obtaining each of the values as a seperate calculate ...
3
votes
1
answer
323
views
Creating/generating centroids point features from raster image in console in QGIS [duplicate]
I have a 1-band TIFF/raster file showing a value for each raster cell. I want to get those cell/pixel values of the TIFF extracted to a CSV file.
I guess there are two ways of doing this.
First, ...
0
votes
0
answers
90
views
ArcGIS Pro calculations combining joined and zonal statistics tables
I have calculated the area of intersect/sum of intersect of rasters using zonal statistics by using province ID as a zone field. I now want to divide that summed data for each province, by the total ...
- 1
0
votes
0
answers
117
views
Toggle Model Builder paths on and off using Boolean - ArcMap 10.5
I have a program that uses an iterate over a multivariable to run checks for different values, but it would be really nice to just be able to toggle the values on and off depending on what you are ...
- 1
0
votes
1
answer
65
views
Adding field and calculating field values based on a current field using ArcPy [closed]
I created a new numeric field (FloodValues) and need to populate that field based on values from an existing text field (ClassName). There are seven different values in ClassName field so I need to ...
- 9
1
vote
1
answer
152
views
Where do I live? (figuring out latitude/longitude from legal documents)
I recently bought the SparkFun RTK Express which looks like a pretty cool little gizmo. I've got some applications for it up in the mountains, but first I want to try it out down here in the suburbs.
...
- 175
0
votes
0
answers
37
views
Picking highest value between two options in field calculation using ArcMap
Is there a way to choose the highest value between two options when using them in a calculation?
The highest value alternates between x and y
This project is in ArcMap.
4
votes
2
answers
94
views
Area calculation of objects with the same, specific formulation
Can someone help me with the area calculation of certain objects in the attribute table?
I want to add up all the objects that follow a specific, same formulation of a specific column in the table. I ...
- 41
0
votes
1
answer
103
views
Adding and calculating User Input Fields in ArcGIS Modelbuilder
I have a model which results in a list of routes with mileages. I want to add 6 fields to the mileage table (Freight Rate, Freight Cost, Material Amount, Material Rate, Material Cost, and Total Price)...
- 11
4
votes
2
answers
1k
views
Calculation in an attribute table in QGIS?
I have the following attribute table:
on which there are points on different types of lands.
Each land has a code that is in the CODE_00 field, I have calculated how many points there are in each of ...
- 387
0
votes
1
answer
80
views
Translate data right in ArcGIS Online?
I have a point feature layer in ArcGIS Online.
I want to create a query on top of that FC that will translate the data:
Calculate and concatenate fields
Use coded value domain descriptions instead of ...
- 1,114
0
votes
1
answer
32
views
Geographic Calculations Across Layers
I have a layer with thousands of points and a different layer with census tracts. I want to determine the average value of each point per census tract. I have tried merging the layers together but ...
- 11
3
votes
1
answer
489
views
Calculating mean value of polygons based on attributes of point layer in QGIS
I am working with QGIS to compute the annual burned area of my study area in Chile. I have two different layers.
One polygon layer which is a 1km x 1km grid of my study area. The only information ...
- 355
0
votes
0
answers
44
views
Accumulate values in raster cells with backlink connectivity
I have origin points in different regions and within these region also specific values within raster cells (with 50m resolution).
My goal is to sum up the values of all previous cells in the ...
- 65
1
vote
1
answer
760
views
Generating GPP and NPP from Landsat images using Google Earth Engine JavaScript API
I just started to to use the GEE and I want to calculate the annual GPP and NPP from Landsat 8 images. I have spent much time looking for a tutorial on how to do this but all I could find is multiple ...
- 37
0
votes
1
answer
195
views
Measuring area of clipped data using shapefile in google earth engine: FIRECCI_5.1 Burned Area Product 500m
I am trying to calculate burned area within the given shapefile from Modis burned area product in google earth engine. But I think I am getting wrong area as it is sometimes more than the area of ...
- 121
0
votes
0
answers
71
views
StopIteration: iteration not started error using arcpy.da.UpdateCursor Arcpy Pro?
I got error of StopIteration: iteration not started and I don’t know why. I have a shapefile. First I made a layer feature by selecting Side = R from ID : 0 to 99. I would like the code starts from ...
- 171
4
votes
1
answer
1k
views
Why can't I change precision of decimal number in new Field Calculator?
Can't click those fields. It worked in the past and now just don't. I can't figure it out.
And even it's set to three by default (and I can't change that), it ends up being infinite.
- 51
6
votes
2
answers
1k
views
Using CASE Statement with two strings in QGIS
I am trying to fill out a field based on information in a different field in the same layer using a CASE Statement in the Field Calculator. My table structure looks like this:
SPECIES
SHORT
Toad
...
- 131
5
votes
1
answer
150
views
How much of territory do buffers cover using QGIS?
Is there a way to obtain how much % of the country covers that buffers using QGIS?
This is a country (Ecuador)
And these are buffers
0
votes
1
answer
542
views
How to calc area using OpenLayers with UTM coordinates
I just need had a point format like below (zone,x,y) and need to calculate it's Area.
39,553816,3791942 39,548052,3731376 39,637947,3711980 39,616343,3808591
- 262
4
votes
1
answer
595
views
Calculating the percentage of overlapping areas from different layers in QGIS
I work with QGIS 3.16 Hannover and I have three polygon layers 'A', 'B', 'C' with multiple geometries in each.
In the image, layer 'A' has the bold polygons and, for each of them (meaning within each ...
- 3,180
5
votes
2
answers
2k
views
Trimming decimal numbers for coordinates/heights in QGIS
I have a GeoPackage table with coordinates and heights. I only want 3 decimals for the coordinates and 2 decimals for the heights.
In the past I could easily define the precision in the field ...
- 2,247
1
vote
1
answer
283
views
Using Calculate Value to get extent of feature to input into Generate Tessellation tool
Here is what my model looks like:
Takes Excel with lat/long and plots points
Splits by name field
Iterate
And buffer into separate .gdb
Calculate value then pulls from the buffer.gdb
This is where I ...
- 11
2
votes
1
answer
781
views
Calculating distances between buildings, plots and road network
I have three layers, see image below:
A polygon layer containing building outlines (Purple)
A polygon layer containing plot outlines (Yellow)
A polyline layer showing the road network ( Red)
What I ...
- 21
2
votes
1
answer
126
views
Calculating ratios between two shapefiles with Python
So I have two shapefiles, one is a grid and one is a map of the world's land. I am trying to find the ratio of land in each cell of the 'grid' shapefile to show the land/water ratio but I'm stuck.
...
- 51
1
vote
0
answers
223
views
QGIS 3.10 and data dependencies
I have one table call "LR - Données", with 2 attributes: 'LR nom français' and 'LR nom latin'.
I have a point layer in a geopackage call "Observations" with 2 attributes: 'Nom ...
- 1,554
1
vote
1
answer
240
views
Accessing data from time series in GEE
I have a code for NDVI time series from an image collection. This code prints the time series in a table or a chart.
Is there a way to access the values in the table of the time series in google earth ...
- 11
1
vote
1
answer
980
views
Performing complicated calculation on bands in Google Earth Engine
I'm trying to perform ANIR index calculation on my image collection. I'm having trouble writing the code in the right way. ANIR index formula is :
cos^-1[((a^2)+(b^2)+(c^2))/(2*a*b)]
(a2, b2 and c1, ...
- 79
1
vote
2
answers
117
views
Calculate the value of two different fields (int), and summarize those two into a new field in attribute table [closed]
I am trying to make a pie chart, that means I have to connect some fields in AT.
How do I sum two integer fields into a new created field. The sum should also be connected to the different object id.
...
- 31
3
votes
1
answer
2k
views
Dynamic/calculated field in ArcGIS Pro via Arcade expression?
In an ESRI video called Getting to Know Arcade, the presenter states that dynamic/calculated fields are possible via Arcade expressions.
How many of you have ever been in a
situation where you had a ...
- 1,114
-1
votes
2
answers
926
views
Measure Points to Coastal lines?
I would like to measure the shortest distance from multiple points to a any part in a coast line of three different costs.
How do I do this with QGIS or with SAGA GIS?
- 151
1
vote
0
answers
238
views
How do I apply phase center corrections to IGS satellite positions?
I'm trying to use the International GNSS Service's SP3 precise orbit files (found here) to calculate the position of GPS satellites for a Precise Point Positioning solution.
It appears that they're ...
- 41
2
votes
0
answers
61
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 ...
- 117
0
votes
1
answer
379
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
- 1
0
votes
1
answer
106
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
1
vote
0
answers
61
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 ...
- 61
0
votes
1
answer
94
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 ...
- 2,037
4
votes
2
answers
582
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 ...
- 186
2
votes
1
answer
172
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
votes
0
answers
93
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 ...
4
votes
3
answers
4k
views
Displaying data in percentage in the attribute table QGIS
I'm trying to figure out how to display one attribute column in percentages. I've created a new field inside the attribute table and proceeded with:
concat("column with numbers to be changed in ...
- 1,022
2
votes
1
answer
113
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.
- 23