All Questions
9
questions with no upvoted or accepted answers
3
votes
0
answers
454
views
Why do each of my buffer-polygons have different areas
I`m using Qgis 2.2 and 2.4 and loaded a wms-map using the coordinate system ERTS89 UTM 32N. I set 8 points (all in on shp-fileand in UTM 32N) on various locations on the map. After that i created a ...
- 31
2
votes
0
answers
598
views
Calculating the area of raster within polygon
I have a raster layer with values of energy demand in each cell. I would like to know the area of the raster within each polygon (see screenshot). Any suggestions on a simple approach for this?
- 181
2
votes
0
answers
507
views
Calculating area of voronoi polygons from real life data using QGIS?
I have an area, which I divided into voronoi polygons using data points. I have no problem creating the polygons.
Now the data points are on a coordinate system, where every degree represents one ...
- 21
1
vote
0
answers
83
views
QGIS ellipsoidal area values changing very slightly between calculations while planimetric values stay the same
I have a number of vector shapefiles that I need to calculate the geodesic/ellipsoidal area for. These shapefiles are accessed and updated regularly, with the area recalculated each time they are ...
- 57
1
vote
0
answers
183
views
Polygon area calculation returning 0.0 QGIS
I am trying to calculate the areas of these 12 individual polygons.
However, when I run the area calculation, two of the polygons return 0.0 - whereas the calculation works for the other 10?
Why is ...
- 199
1
vote
0
answers
55
views
Grouping of polygons or overlaying layers in same shapefile? Problems calculating the correct polygon areas
I am having trouble calculating polygon areas of my shapefile. When opening the shapefile in QGIS it seems like there are multiple polygons overlapping within the same shapefile or that polygon areas ...
- 61
1
vote
1
answer
1k
views
Processing area and calculating volume of polygon with know elevation from DEM in QGIS
I got a DEM of a watershed and I need to create a dam at a fixed elevation (with a rectangular polygon corresponding at the top of the dam) and calculate it's area (including the slope (fixed value) ...
- 49
1
vote
0
answers
250
views
Calculating area of polygons in EPSG:102022 in QGIS?
I am trying to calculate the areas of administrative regions in Uganda, using the EPSG:102022 projection. They are polygons. But everything I do produces areas in degrees rather than meters, giving ...
0
votes
1
answer
74
views
Adaptive polygon division in QGIS
Let say I have an irregular polygon layer that I want to divide into squares of fixed size (i.e. 50 x 50m). The simplest solution is to create a grid based on the polygon extension and then use the ...
- 47