Questions tagged [summarizing]
The summarizing tag has no usage guidance.
127
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Calculating individual Sum of multiple fields
I am trying to calculate the sum in each field in my list:
Cost_Adders = ["RR_CROSSING", "INTERSTATE", "RIVER"]
for Cost in Cost_Adders:
where = f"Cost_Adders = {...
- 13
0
votes
1
answer
45
views
Partial and Total Sum in one table (QGIS print composer)
In QGIS 3.22.14, I'd like to present in the print composer a sub- and total sum in one table. The values in the attribute table can be anything (area, count, etc.), the key is to present them in one ...
- 31
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25
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Summarize Within Returns with zero values
I am trying to summarize the areas of tree canopies (almost 2.3 million records) within each each city (Multipart). The tools runs without error, however the columns of interest are empty.
How can ...
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4
votes
2
answers
169
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Expression to calculate sum in QGIS Attribute table
There is a shapefile about facilities with columns "country" and "annual production".
I am looking for an expression for a calc field to summarize total production for all ...
- 153
2
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1
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43
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How to sum the values of two collections in Google Earth Engine?
I'm using GLDAS image collection in Google Earth Engine, and what a want is to sum four bands for a specific time like 10 years, and to obtain a collection with the sum date by date of the four bands:
...
- 21
2
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1
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66
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How to create a dynamic label for a polygon layer that sums line length and other attributes of another linestring layer
For an agroforestry design in QGIS I am trying to add dynamic labels to an area polygon that displays the number of rows, total length and the total number of trees that are in the design.
So far I ...
- 45
5
votes
2
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108
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Summing values of different layers based on another
I have a layer (called here 'layer_top') made of multiple polygons (in orange in the picture). Each polygon of the 'layer_top' overlaps with polygons of other different layers (called here 1,2,3,...). ...
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107
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Summing on multiple attribute value on same coordinate in QGIS
I have data like this:
If we see clearly then there is same data in same coordinate, now I am doing manually like this picture which is very time-consuming.
How can do it easily in QGIS?
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74
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Problems in "summarize within" using Python notebook
I am trying to do "summarize within" with a multiple years of points data with a polygon. I need to summarize some columns in the table of the points within boundaries of the polygon. Since ...
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4
votes
1
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115
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Creating iso-contours of cumulative values of overlapping polygons in QGIS
I start by drawing polygons by hand and assigning each polygon an attribute value for a frequency (or probability). What I then need is to create a heat map or iso-contours that show the cumulative ...
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63
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Summing line lengths inside each polygon in QGIS
In QGIS 3.26 I have polygon layers (districts) and line layers (roads) in my project.
I need to sum the line lengths inside the polygons and write them in an attribute table of this polygon. The goal ...
- 75
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54
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Using Filter-Argument in Sum-Expression
I am a QGIS-Newbie who is trying to get familiar with the Field-Calculator.
I want to sum up the "Length" of all objects with "Calc-ID" of value 1.
I know it is possible to select ...
- 11
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205
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Weighted average values of overlapping polygons in python
I am trying to reproduce the “summarize within” ArcGIS Pro geoprocessing tool with GeoPandas.
I have basically two polygon files: one with socio-economic data in census units and one with income data ...
- 1
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36
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Calculating percentage of classes of raster present in cells of larger raster using ArcMap
I have a Landcover raster layer at 25m resolution and would like to calculate the fraction of different classes within this layer present in each cell of a 1km resolution raster.
The diagram below ...
- 21
4
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1
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338
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Summing numbers separated by commas in string field in QGIS
In QGIS, I have a column separated by comma (shown by column "lengths"). I want to sum up elements in it for each row. The column is a text field string.
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251
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How to sum-up values of a column A, with same ID in column B in QGIS field calculator
In my QGIS, I have a shape file that already contains a column stating the size of each urban green space and a column that holds the area ID (equal to a zip code).
Via the field calculator, I would ...
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105
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Calculating cumulative sum of area values in attribute table by graphics in QGIS
In QGIS I have a set of polygons divided into plots, each polygon has a diameter and area. I would like to sum up the polygons per each plot area.
From the attribute table, the polygons are not ...
- 69
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135
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Calculating two columns at once in QGIS
Is it possible to calculate two columns at once?
So what I mean is that we have different covers and lengths and I want a total length of "Cover A" after that a total length of cover tb and ...
- 41
2
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1
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100
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Categorizing field and summing attributes for label in QGIS
Using QGIS, my goal is to group "FSA"s (postal code or zip code ordering) into larger regions, and have data labels labelling these larger regions. The labels themselves would be the sum of ...
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3
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60
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How to prevent '+' operator from concatenating rather than summing [closed]
I am trying to sum two fields and am using the expression below.
"Q1 answer" + "Q2 answer"
This expression is concatenating the answer to '32' when the answer should be '5' (3 ...
- 193
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1
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590
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Calculating sum of values based on another attribute as filter in QGIS [duplicate]
I have shapefile data set (Road segments) my area of interest is to calculate the length of all road segments having a particular attribute, e.g.: sum of (length attribute) when Attribute1=something. ...
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1
answer
41
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ArcGIS spatial joins: how many species are in an area as well as averaging enviro data (polygon+points)
I am trying to work out how many species are within certain boundaries (ie. states) as well as find the average of the environmental factors (like rainfall). I am using:
A map of Australia broken ...
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280
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Summing up values in rows with exceptions in QGIS
I have given my objects multiple value that represent a "need for action". I want to sum up those individual numbers to an overall "pressure for action".
I have multiple objects ...
- 475
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2
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270
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Grouping and measuring total length of road based on specific attribute in QGIS
I have this dataset that describes the cycleways of a city.
I want to measure the km of cycleway for each type of highway (residential, track, unclassified, ecc) and then calculate the percentage of ...
- 161
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136
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QGIS aggregate only specific values in a column
I have a QGIS file (see img attached) and I want to calculate the same as Area_HA only with CODE_06 between 100 and 500.
I can't find the expression to add to the field calculator.
yes, I want to ...
- 417
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votes
2
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406
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Faster calculation of cumulative sum in attribute table in QGIS
I have a shapefile attribute table in QGIS that I would like to calculate the cumulative sum. The thing is that it has over 1.5 million features.
Type of device: HDD.
The attribute table looks like ...
6
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3
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472
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Calculating cumulative SUM in QGIS Attribute table
I'm trying to get the cumulative sum of the column "uren_duur" in a new column "uren_tot" based on the recorded water height "NUMERIEKEWAARDE". The water height ranges ...
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3
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2
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384
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Summarizing fields with same ID in QGIS Field Calculator
I am looking for a command, that sums the value of the field "Baulast" if they have the same "ogc_fid" and if there is a Number in the field "WEA". If there is no number ...
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93
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Summing values of field in polyline layer that intersects grid in QGIS [closed]
In QGIS I have created a grid. Now I want this grid to be intersected with a line shape. The line shape contains numbers in field "x". I want to know the sum of field "x" in each ...
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305
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Counting several groups of variables within same attribute table using ArcGIS Pro
I have a building layer. Different types of buildings have different codes, and several types of buildings belong to the same group (not actual codes but as an example codes 100-149 are residential ...
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0
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249
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Summing raster files through GDAL
I have a folder with over 500 raster (.tif) files. I want to produce an output raster file that is the sum of all the raster files in my folder. I am trying to use gdal and sepcifically the gdal_calc ...
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2
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94
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Clustering vectorpoints
I created a layer of vector points out of a raster. The raster was a .png, where I extracted all the pixels with the value 1. Initially, it was a Paper, where I marked points with a pen. Now I am ...
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44
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Summing all record in field and putting value in new field
I try to sum all record in "AREA" field and put a value in "SUM" field for calculate a "Ratio" field by using Python.
But I struck in a sum part.
Here is my code :
arcpy....
6
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3
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470
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Calculating sum of line length for hundred vector layers
I usually calculate total line length by adding a $length field and going to summary statistics. How would I do this if I have many layers? Is there a faster way? I batch added the $length to all of ...
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84
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Query for adding new field that is the sum of months fields
I have a table where fields are a specific month of a year. And I just want to add a new field that is the sum of the months fields that are ticked. Practically speaking I need to know the duration of ...
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3
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752
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Summing data in row of certain attributes in QGIS
In my shapefile, I have calculated some indicators for each polygon. Now I want to create a new field having sum of these indicators.
I created new field and populated it with desired values using ...
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84
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Accessing features in a cluster group in point cluster symbology
I would like to get a dynamic stat value on attributes using point cluster symbology, like it is exposed in this topic
QGIS 3.10 - Point cluster symbology sum attribute
Unfortunately, the answer ...
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3
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Summing multiple fields in QGIS
I have a layer/table with several fields I need to sum together to create a value in another field. I have tried using aggregate() and sum() but I can't get the a correct syntax to be able to do the ...
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443
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Dissolving features with two fields and summing values for third field in QGIS
I'm trying to dissolve the fields "Inundation" and "EVC_BCS" (to get the areas of inundation and non-inundation for each rarity category). When I do the dissolve, I would also like ...
- 53
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271
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Sum/aggregation of polygon's values within other polygons using dyplr
Let's say you have two sf objects made of polygons. In my case, one is administrative units (ADM) and the other is buildings (SHAPES). I would like to calculate the sum of the surface area of SHAPES ...
- 571
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5
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Counting values of each classification code using QGIS
I feel like this is an easy fix, but I'm struggling to just get a count of how many attributes I have for each value in a certain column for an Attribute table.
I have a column of landfire ...
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120
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QGIS: Join attributes by location calculates values wrong
It seems like I got the same problem which is discussed in this thread. But since it's 2 years old already, there's an easy solution to this by now?
I'm joining a vector layer which contains seperat ...
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236
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Summing values in Virtual Layer returns NULL
In a Virtual layer I'm trying to sum the values (real) on a table ('PESQUISA') but it returns NULL. What am I doing wrong?
This is the code I'm using:
select sum("renda_mensal") as sum
from ...
- 1,064
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236
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Summarizing table based on 2 columns using ArcMap
I got a shapefile that has the landuse and the area of every single piece of ground near a specific road. Like this:
I want to summarize all landuse areas of near each road in one row. Like this:
...
3
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330
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QGIS statistical summary gives exponential value
I need the precise sum of areas for a polygon layer, where I have the area values in an attribute. When I use the Statistical Summary window it shows the sum in exponential notation:
Statistic Value
...
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2
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711
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Summing area of by several attributes in QGIS
I have a shapefile that contains building footprints with multiple addresses with different functions (with each an usable area). I would like to calculate the sum of the usable area, per building &...
- 241
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470
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Select polyline features and see total length in ArcMap
I have a layer of polylines representing sewer mains. I want to break the layer down into groups of approximately the same length and area.
Is there a way I can select multiple features in ArcMap and ...
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63
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Combining parcels that are adjacent and add up to more than 10 acres
I am using ArcMap 10.7.
My task is to find a site to be developed for parking. Sites are supposed to be greater than 10 acres. But we can also look at adjacent sites that add up to 10 acres. I read ...
- 11
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136
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Summing area depending on another field value in the Field calculator
I have a landcover layer with an attribute of the administrative region ("GEN"). I am looking for an expression in the field calculator to calculate the summarized area depending on the GEN-...
- 2,147
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3
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403
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Label sums of surfaces grouped by common attribute values
I want to label the sums of surfaces ("Groesse") grouped by common attribute values ("Block") in QGIS 3.16. I need one label for each group.
The following pictures help to describe ...
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