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 ...
- 15.7k
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 ...
- 73.1k
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 ...
- 330
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. ...
- 73.1k
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 ...
- 11
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&...
- 33.3k
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 ...
- 41.1k
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 ...
- 65.2k
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
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 ...
- 74.8k
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 ...
CommunityBot
- 1
-1
votes
1
answer
139
views
Can compilation and display of species frequency data be improved using QGIS
I am new to QGIS 1.8.0.
I would like to find out if the way I put a species frequency map together could be improved upon.
I had to map the presence or absence of 7 plant species surveyed in 30 2m x ...
- 65.2k
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 ...
- 33.3k
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
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 (...
- 33.3k