Questions tagged [grouping]

Associating or clustering data based on common attributes or properties.

Filter by
Sorted by
Tagged with
4
votes
2answers
57 views

Replicating ArcMap legend in QGIS 3

I am trying to replicate this ArcMap legend in QGIS but i can't seem to get it right. I am stuck in print layout and using QGIS 3. I have the title 'LEGEND' but i do not know how to categorize the ...
3
votes
3answers
88 views

Counting and merging features based on attribute field in QGIS

I have a shapefile with a number of features, each with a field called "region". I want to count the number of features corresponding to each region. Outputting a shapefile with one feature ...
2
votes
0answers
39 views

Dynamic buffer regroup [duplicate]

I am using QGIS 3.16 and I want to create a dynamic buffer around a layer of points, so that every time I move some point the buffer also moves. I have succeed by duplicating the layer and then ...
0
votes
1answer
21 views

Hiding/Displaying dashboard content (tiles) based on user or group logging in using ArcGIS JavaScript API

I want to know if it is possible to either hide or display the content of an Esri webapp, dashboard, or experience (tiles, widgets, data layers, filters) depending on which Portal user is accessing ...
2
votes
1answer
53 views

Clustering of points but with a condition of not crossing set of lines

I have multiple sets of around 200-300 points and I have the following requirements: Cluster the points in each set into a group of points with a minimum & maximum number (as defined by me). In ...
0
votes
0answers
13 views

Which analysis to use? Analysing points' likeness across multiple fields including proximity. (AHP?)

I don't have much of a background in coding. I have a point layer with 400 points. The attribute table contains 3 fields of interest: Bearing (values between 0-180); a Ratio (ratio of ellipse long/...
6
votes
2answers
233 views

Counting fire occurences per county per year using QGIS

I wish to loop through this shapefile, and for each "COUNTY_NM", count the number of values corresponding to each "layer" value. I want to output a CSV or equivalent which would be ...
0
votes
0answers
21 views

Grouping polygons by maximum sum of attribute using ArcGIS Pro

I have an exercise with several boundary polygons with the fields "number of cat owners" and "owned cats" inside the area. Sample Data polygon ID cat owners cats 1 4 12 2 2 3 3 ...
0
votes
1answer
127 views

Rename layers within group automatically by adding a prefix derived from group name using QGIS

I have some Sentinel derived rasters (time series) divided in tiles. In my QGIS (3.16) each tile is represented by a group. Each group contains rasters from different dates and according layernames. ...
0
votes
0answers
35 views

Graphic grouping in QGIS Map Layout

In QGIS 3.18, I'm trying to draw symbols/graphic for Map Legend manually in the Map Layout. When grouping them, it shows the big box like the screenshot below and seems not convenient to continue ...
0
votes
1answer
254 views

GeoPandas TypeError: geometries are not orderable (numpy: TypeError: '<' not supported between instances of 'Point' and 'Point')

I'm trying to group rows of a GeoDataFrame based on a common gid value and aggregating two columns for which the values differ but I am facing this error: TypeError ...
2
votes
1answer
60 views

QGIS - creating a report from attribute table

I create a report from attribute table. At one column I have a name of a street, at second column I have a number. Relation between street and a number is one-to-many. Is there a function to show at ...
5
votes
3answers
146 views

Generating unique code for features via grouping by several attributes

I have features with 3 columns of information ("material", "name", "dimension") in the Attribute table. I need these features to group - to create 4th column where ...
0
votes
1answer
46 views

GeoPandas dissolve polygons based on data values

I have a long list of polygons in GeoPandas dataframe (Sample below) Index zone_name value geometry 0 A 100 POLYGON ((77.47638480859382 13.05584728590942, 77.50519132714851 ...
0
votes
2answers
65 views

Sampling points in R with both distance constraint and group

I have a spatial point data frame with categorical variable as a column named "type", I would like to draw a random sample from these points (let's say 100 points) with maximum and minimum ...
3
votes
2answers
190 views

Area of each polygon that intersects another layer and total area of intersections in QGIS

I have two layers: 'A' (orange) and 'B' (purple). Using a Virtual Layer and group_concat I am able to list the polygons in layer 'B' that intersect with those in layer 'A' thanks to @Jesse McMillan's ...
0
votes
1answer
30 views

Composite layer by distance

I've got a complicated problem right now. I have a layer with polygons and use the tool "Closest Neighbor" to find all Polygons that have a neighbor within 10 meters. That works fine, but ...
1
vote
1answer
133 views

Assigning incrementing id for each feature group in attributes with QGIS expressions [duplicate]

I have a layer with a repeating field name, thus different groups of features (I also have a numerical group field). How can I add a field group_id, using QGIS expressions? What I want is kind of a ...
2
votes
1answer
23 views

Grouping a dataframe whilst making a pie chart

I have a data layer which consists of an attribute table of ~30 columns and ~6000 rows. This table contains information about buildings that are located close to parks in Amsterdam. I want to create a ...
0
votes
0answers
48 views

GEE index image segmentation and classification

I have a code for performing an index calculation on chosen images and in chosen AOI. The next step I want to do is segment it by pixel value and classify them into 3 groups. I mean a range of pixel ...
2
votes
1answer
113 views

Group neighbouring features based on sum of attribute

Each polygon (building) contains "x" number of flats (eg "flat_num"=10 in one polygon/building). I would like to group multiple polygons if: the grouped polygons are neighbors ...
4
votes
2answers
152 views

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 &...
1
vote
0answers
362 views

Exporting with QPackage or QConsolidate

I know there is a similar question, but it might be dated, and didn't completely answer my question. I know of two plugins to export your QGis project, QPackage and QConsolidate. I'm not very familiar ...
1
vote
1answer
60 views

Find Largest Building in each Parcel (largest feature in each groupby set)

I have a question similar to this one, but the proposed approach doesn't seem to work. For context, I am new to qgis. Given a set of parcels, each with 0 or more buildings, I want to select only the ...
0
votes
0answers
33 views

Creating polygons from open ended line (riverine) feature

I have a dataset of rivers which I'd like to build into polygons of areas enclosed by rivers. The rivers are continuous lines but there are open ends. Is this possible? It's OK if the calculated ...
5
votes
1answer
106 views

Copying all visible layers to new group

I would like to copy all visible layers in a project to a new group. Does anyone know of a quick way of doing this? Background: We have a Project that acts as a library for all the spatial data we ...
6
votes
4answers
535 views

Adding unique ID for groups of items using Field calculator in QGIS

I have a set of string values in a shapefile's attribute column and want to assign a number to them in a way that each unique string gets an integer number, like this: How do I do this using the ...
0
votes
1answer
88 views

Large-scale cloud masking, grouping and mosaic in Descartes Labs platform

I am looking to create a stack of cloud-free sentinel-2 imagery by day for a large portion of California for all of 2020 in the Descartes Lab platform. I realize that this is a very large amount of ...
1
vote
0answers
24 views

Using a postcode sector map with a population attribute, create clusters of those sectors to have a total population within a defined range

I have a postcode sector map in QGIS and one of the attributes is 'population'. I am trying to create a map showing what postcode sectors would need to be clustered together in order to split the ...
2
votes
2answers
77 views

Merging attributes of point features at same location

I have a CSV-file with all the facilities in an area, some sites have multiple facilities so at some locations there will be multiple points e.g. sports hall and swimming pool. Is there a way to join ...
0
votes
0answers
168 views

ArcMap - error 000728 field does not exist within table

I'm trying to join the table from Excel (my calculation about one region in Poland) to my shapefile (which contains whole Poland map and different calculations, so I need to attach a new table to be ...
2
votes
1answer
57 views

Categorizing attributes by keyword in new field with field calculator in QGIS 3

So, the geological classification shapefile of the Philippines has the 'DESCRIPT' field which contains the geological time scale of each feature. "Oligocene-miocene" and "Oligocene-miocene (igneous ...
0
votes
0answers
38 views

Calculate frequency based on a filtered field, and put the value in another field

I'm a python beginner. I'm working on one feature class, i would like to group this feature based on group_ID field, and then for each one of this group i would like to calculate the number of rows ...
3
votes
1answer
334 views

Centroid of multiple polygons based on value in attribute table

I have a (polygon) shapefile with multiple zones. Now, I would like to calculate the centroid of groups of these zones. The zones have to be grouped based on a value in the attribute table: AreaNr ...
2
votes
1answer
446 views

QGIS - SQL GROUP BY and MAX

I have a layer which contains a unique ID (UID) for each feature and another column of Scores. For example: UID, Score A12,1 A13,1 A14,4 A12,2 A13,3 A14,5 I would like to use an SQL statement to ...
0
votes
0answers
45 views

How to make analyzeGPS distanceGPS group by trip?

I have a dataset with id, lat, lon and time, where each trip has a unique id. When I try to use mutate with the distanceGPS function in the AnalyzeGPS package and group by trip using this code: gps%&...
1
vote
2answers
142 views

Finding number of days per ID in table using ArcPy?

I need to count the span of days an individual has been observed, from the first til the last observation day. There can be many observations per ID per day and not everyday has observations, hence ...
2
votes
0answers
111 views

Grouping layers by attribute value and finding nearest neighbour using QGIS?

I am new to QGIS. I have two layers (layer_a and layer_b) consisting of two sets of points. If I want to find the nearest point in layer_b for each point in layer_a, I can just use the Distance ...
2
votes
2answers
62 views

Update 1 random value in a group of values

I have an attribute table with a date field and a random field. The date field has three different times for each day. I need to input a '1' in the random field for one of those three times in each ...
1
vote
2answers
201 views

How can QGIS 3.X create atlas by a group field?

I have a line layer with 8 features and a field TYPE (5 features is type_A and 5 features is type_B). I want to create a atlas which output is two single image (one is grouped by typ_A with 5 features,...
0
votes
0answers
339 views

Leaflet markers at same geo location (ClusterGroup)

I have a map created with leaflet with different markers. Sometimes the markers have the same (1:1) geo position. I have already tested the great addon clustergroup, but I need the function to be ...
1
vote
1answer
424 views

Group by variable and create layers from that in QGIS [duplicate]

I have a large shapefile with one layer with several variables. The shapefile has US block groups that I'll use for analysis. However, as I want to use this for leaflet, I would like to create ...
3
votes
0answers
81 views

Clustering based on eqaul populations

I have a map of a city that is divided into 65 sectors (building lots in purple, sector boundaries in red): In my shapefile of building lots, I have an attribute that is the total population within ...
1
vote
2answers
88 views

Selecting features from grouped shapefile

I have downloaded some glacier outlines from the GLIMS database (http://www.glims.org/maps/glims) as a SHP file. This contains multi-temporal data, that is, more than one outline per glacier (more ...
1
vote
0answers
27 views

Grouping overlapping points by UTC Time, sum and average?

I have data from airplane calibrations where the plane flies in a crossing pattern; i.e. going E->W and W->E, then N->S and S->N. I need to sum and average the values for both flights in each ...
7
votes
1answer
1k views

Creating Groups of points based on proximity in QGIS?

I have a dataset with around 900 points and I want to cluster them into groups of 44 based on proximity. Is this possible in QGIS? I have tried to use the convex hull tool with no success.
1
vote
1answer
766 views

Get child layers from a layer group

I'm using a geoserver and openlayers3 with html. I cannot find the way to obtain the child layers from a layer group. I have a layer group, and I show it in html perfectly, but what I want is to be ...
2
votes
2answers
962 views

Replace several coordinates by its mean value grouped by multiindex Pandas

I have a table with some info that are getting by a GPS, in my table I have this structure: Date Time Latitude Longitude Accuracy Weather Visibility ViewPoint Species Bearing ...
3
votes
0answers
131 views

Grouping neighbor points based on field sum in QGIS

I have about 14,000 points. These points have a specific field "time", an integer value, mainly between 1, 2 or 3. I would like to split these 14,000 points into groups based on the "time" field ...
2
votes
0answers
523 views

Group by index column, compare area and add values to new column in Python?

I have these columns: index, area_of_poly, cad_admin I have to group by index (it is a normal column called index) in order to take the rows that have the same value. #all the ones, all the twos, ...