All Questions
32
questions
0
votes
1
answer
37
views
New flow direction attribute for sub-catchment layer in QGIS
I have a polygon layer in QGIS with self-created sub-catchments. I also have a DEM, a flow-direction raster and a raster with the corresponding stream network and stream order. I would like to create ...
- 85
0
votes
2
answers
72
views
How do you add information to a polygon from multiple polygons based on location in QGIS?
I have a couple of points and have made a buffer layer of 1km around each point, which contain information about which point it represents. I have another raster layer (containing information ...
1
vote
1
answer
180
views
Summing length of lines of a specific category from another layer in QGIS
I have a polygon layer of ski resorts call skiResorts. I have a liner layer of pistes called pistes. The pistes layer has 2 several attributes and include aa_piste_length and aa_piste_difficulty. ...
- 151
1
vote
2
answers
415
views
Connecting the boundaries of two polygons
I have a number of polygons with a section of 'empty space' between them, like this:
They are set up on the same layer, with different entries in the attribute table.
I'm looking for a way to join ...
anon
2
votes
2
answers
124
views
"Duplicating" the attribute table for many polygons in QGIS
I have about 45 polygons that refer to parcels of land and I want to create the same attribute table for all of them and edit the information/prices afterwards depending on the parcel.
"Joining&...
- 23
1
vote
1
answer
125
views
Add attribute to polygon layer that is average of polylines that lie within border qgis
I Have two layers, one is a polygon and the other is a polyline. I would like the solution to be using QGIS.
I want to create a new attribute in the polygon layer that take the average of the ...
- 195
0
votes
0
answers
79
views
Using fields in attribute table to generate new polygon
Is it possible to use fields in the attribute table to duplicate/ generate a new polygon with the field information?
I have a series of numbered polygons (Features) which I want to be able to link to ...
3
votes
1
answer
57
views
Request attribute information from multiple polygons below a point
In QGIS I created a "grid" with points 100 m apart from each other. Below this layer of points there are multiple layers of polygons. Each polygon has a column with values in its attribute ...
- 33
0
votes
1
answer
305
views
Merging adjacent polygons with aggregated sum beeing inside a certain range
The data
I have a polygon layer with polygons (download the data here) of different sizes as can be seen on the screenshot. Each polygon contains a value for the attribute called count. The range of ...
- 73.1k
5
votes
2
answers
605
views
Assigning attribute to polygon after polygonization in QGIS
I've created 50+ polygons by polygonizing a contour derived from a USGS Digital Elevation Model, and I've and fixed the geometries of the polygon layer.
Now I want to assign an attribute (mtn or ...
- 63
3
votes
2
answers
135
views
What is the right sequence of actions when creating new polygon layer with given attribute table structure?
I want to create a new vector layer with polygons in it. I've an Excel file with the columns that have to be the attributes in the layer's attribute table. How do I achieve this?
I'm kinda lost, I ...
- 229
1
vote
1
answer
125
views
Splitting population among overlapping polygons
I'm quite new to QGIS.
I have one layer that is a quadratic grid with a different population in each square, and I have another layer with two polygons that I got from the Travel Time plugin. I want ...
- 113
3
votes
0
answers
120
views
Adding attribute of polygon orientation depending on neighbors in QGIS
I have a shapefile with buildings as polygons. Is it possible to add attribute columns referring if the polygon boundary is "other polygon" or "outdoors" for a certain orientation (...
- 309
2
votes
1
answer
400
views
No data in the attribute table when creating buffer in QGIS [closed]
I wanted to create a buffer around a polygon using QGIS. This buffer zone is something I will use to estimate the distances between patches of habitat but every time I do so there's no data in the ...
- 111
1
vote
1
answer
611
views
Manually updating the attribute table of a clipped shapefile
I need to do calculations of surfaces of polygons in vector layers. The clip tool does just what I want - I can clip the polygons of the input layer to the clipping layer. When I project the new layer ...
- 13
0
votes
1
answer
193
views
How to stylize polygons sharing the same attributes to represent a common outline
In QGIS 3.14.16, I want to outline multiple polygons which share same attribute value.
Styling the layer with the same attribute value bring the following result:
The style I wish to have is:
I ...
- 392
-1
votes
2
answers
132
views
How can I merge multiple shapfiles with shared polygons in QGIS (3.8.0) without ending up with double attributes?
I have multiple shapefiles for different subspecies. The habitat range is devided into small hydrobasins (lvl 10) and I want to merge the ranges for subspecies to get a final species range. Naturally ...
- 19
0
votes
1
answer
1k
views
QGIS - Set display order of polygon features in the same layer [duplicate]
in QGIS I have a polygon layer with overlapping features. While this is not ideal (and I am currently changing this), I am wondering whether I can in any way affect the order of the features displayed....
2
votes
0
answers
43
views
One polygon layer for an area with different projects in the same layer?
I was wondering if it is possible (maybe not ?) to make a structure so that I can have diffrient information (projekts) over the same area/point in the same layer. This would be for an overview of the ...
- 373
4
votes
3
answers
342
views
Prioritising polygons in QGIS
I just created a layer in which I hand drew a lot of polygons.
Now I want to fill out the Attribute table through commands since it will save me a bunch of time.
Therefore, I calculated the area of ...
- 169
2
votes
1
answer
807
views
Getting information from one layer in attribute table of another layer
In the picture you can see polygon number 39a in the center. This polygon is drawn on one layer. The layer underneath holds information with soil conditions (green and red). You can see that polygon ...
- 51
2
votes
1
answer
3k
views
How to define the type of a field in the field calculator so that the rasterize (vector to raster) tool recognize it?
I have a shapefile (polygon) that I want to rasterize by an attribute but the rasterize tool does not recognize the right field. When I create a new field using the field calculator it does not matter ...
- 377
1
vote
0
answers
104
views
Problem with the attribute table values, they are replaced with ************
I suddenly have a problem with my attribute table. When I change a value the whole line is messed up because values shift and the value I add is replaced by ***********. How can I avoid this from ...
- 11
3
votes
1
answer
76
views
Returning 1 or 0 in column based on point location using QGIS?
Within QGIS - I have two layers. One is a point layer, the other is a polygon layer.
I'd like to create a column in the point's attribute table using the field calculator where 1 indicates the point ...
- 307
6
votes
3
answers
2k
views
Listing IDs of polygons within another polygon in the Attribute table
I have two polygon shapefiles in QGIS.
I would like to have the polygon "ID"s of 'B' listed in the attribute table of 'A' for the case that they overlap.
As a demonstration:
I tried ...
- 812
2
votes
0
answers
837
views
Setting color from color value in attribute table in QGIS? [duplicate]
I have a shapefile with colors (hex code) in the attribute table for each polygon.
How can I set color of each polygon according to the color value in the attribute table?
- 561
2
votes
0
answers
295
views
How do I merge a point attribute table to a polygon attribute table in QGIS or GRASS?
I have a point layer containing the following data:
I want the following polygon areas to be added to the point attribute table as all the points occur inside the various features of the polygon ...
- 159
2
votes
0
answers
148
views
Adding attribute data together within multiple polygons in QGIS? [duplicate]
In QGIS I have two vector layers, the first is a set of polygons and the second is a series of points. Each point has a numerical attribute associated with it and is located within one of the ...
- 109
2
votes
1
answer
840
views
How to do a "fuzzy" intersection?
I have two layers that look like this:
I want the intersection (or whatever the correct term may be) to look like this where the output polygons are the same as the original base layer, just with ...
- 123
3
votes
2
answers
1k
views
Getting the attributes of particular polygon in QGIS
I downloaded a shapefile that has demographic data for census tracts for a city - each represented by a polygon in the vector layer.
I can click the attribute table icon to see the whole sheet of ...
- 641