All Questions
65
questions
123
votes
8
answers
354k
views
Calculating polygon areas in shapefile using QGIS
How do I calculate areas of an area shapefile in square meters (m²) or in acres (ha)?
I didn't find that functionality in the Vector Tools.
- 2,321
14
votes
2
answers
57k
views
Calculating polygon areas and perimeters using QGIS
Using QGIS, if I load a polygon layer and make a new column, how do I fill that column with the area of each polygon and another column with the length of the perimeter of each polygon?
- 995
10
votes
2
answers
9k
views
Calculating proportional area of polygon within another layer's polygon using QGIS
I have two polygon layers, 'model' and 'ntem', whose features overlap and intersect one another.
I would like to calculate the proportion of the area of the 'model' polygons which fit within each '...
- 497
10
votes
2
answers
2k
views
Defining hexagon area around mapped points using QGIS
I am using QGIS to map a number of radio antennas (for mobile network).
Once I have the layer of the sites (done), I would like to assign to each site a coverage area (envelope). I could achieve that ...
- 101
8
votes
3
answers
4k
views
Remove Holes Existing Within a Single Polygon for a specific area in Qgis
I have a shapefile that consists of a single polygon. I have gaps within the polygon that needs to be eliminated, but only the ones that are less than 200m2.
I tried different ways but none of them ...
- 103
6
votes
3
answers
482
views
Calculating proportional area of polygon covered by circle [closed]
I have two layers here (ignore the green layer), blue polygons and black circles. I want to calculate for each circle, what percent of the each of the blue polygons does it cover. For example, the ...
- 449
6
votes
1
answer
288
views
Calculating Statistics Based on Expression in QGIS?
Is it possible to calculate the sum of polygon areas based on whether or not it has a value in another column?
For example:
In column 2 I have the area of polygons. I want to calculate the area of ...
- 385
6
votes
2
answers
2k
views
Wrong $area from field calculator (QGIS)
The area of the polygons in a layer, calculated by the field calculator with "$area" is wrong (much too big) for some polygons. If I draw the concerned polygon again, the area is calculated correctly. ...
- 283
5
votes
2
answers
1k
views
Intersecting area between two polygons in the same shapefile in QGIS
I have a shapefile with two polygons in it. I would like to be able to generate the intersecting area between the two polygons.
Please note, I have tried using the intersect tool, however this does ...
- 241
5
votes
2
answers
2k
views
Calculating area between two line shapes using QGIS?
I'm new to using QGIS (2.0).
I'm trying to calculate the sidewalk area of a city.
For that I have some shapes, extracted from Bentley Microstation, with the topology (facades, fords, fences, etc...)...
- 51
5
votes
3
answers
1k
views
Polygonize vegetation area from Landsat7 RGB using QGis / Bilko?
I'm trying to extract the areas with vegetation as a polygon-shape from a landsat7-image, 30m resolution, RGB, using QGis 1.8 or Bilko or (hopefully in the near future) ArcGIS. The area is in Northern ...
4
votes
5
answers
2k
views
Calculating polygon area in QGIS without adding new field
Is it possible in QGIS to quickly calculate the area of a polygon using a Processing tool, plugin, script without adding attributes or creating a new layer?
Something launching the results window or ...
- 87
4
votes
1
answer
195
views
Calculating area of polygons without script in QGIS Field calculator
Whenever I click the Field Calculator in the attribute table, I am prompted to created a script in order for it to calculate the area of a polygon. However, I do not want to use code in obtaining a ...
- 41
4
votes
2
answers
8k
views
Displaying unit as 'text' within label in QGIS?
When labelling areas in QGIS I can't figure out how to display the unit after the number value from a field.
For example the area of my polygon might be 1.23 hectares, which has been calculated ...
- 41
4
votes
1
answer
2k
views
Selecting polygon with the largest area in QGIS
I would like to select the largest number in a column of an attribute table by "Select by attributes" in QGIS to select the polygon with the largest area. How would be the expression for ...
- 181