All Questions
Tagged with buffer coordinate-system
79
questions
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99
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Incorrect distances when measuring on QGIS, leading to buffers and density maps being much larger
I have created a boat traffic map on QGIS 3.36.2. Here, I have a vector layer containing different points connected to show the boat routes in the Andaman and Nicobar Islands in India. To ensure that ...
0
votes
0
answers
62
views
Choosing projection for buffering polygons
I'm working with an application that needs to manages (lat lon) polygons all over the globe. For some reasons i need sometimes to do some operations like buffering, for more convenience, I would like ...
- 126
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0
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26
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Buffer set of lines in meters that span the entire USA [duplicate]
I imported a shapefile with lines that span the USA. The CRS comes in as EPSG:4326-WGS84. I want to buffer all the lines by 600 meters. The Buffer tool suggests reprojecting since only degree unit ...
3
votes
1
answer
163
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Creating buffer for MultiPolygon that covers all its surroundings in QGIS
When I try to use the Buffer tool in QGIS, it only allows me to create buffers in degrees ("grados" in the screenshot below) and it does not give me the option of changing the units (to ...
- 31
3
votes
1
answer
340
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Buffer is not yielding the appropriate size in QGIS
I am trying to create a buffer of 10 kilometers around each dot already uploaded. The problem is that these buffers seem to be unreasobly larger than 10km. (Portugal). I have tried to use multiple ...
- 33
1
vote
1
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234
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Which temporary projection is most suitable for calculating a buffer around a route
To create a buffer around route (for purpose of querying around a route), I figured I need to:
convert route points from geographic to planar coordinates
calculate a buffer
convert result back to ...
- 151
0
votes
2
answers
840
views
QGIS distance in meter instead of decimal degrees
I use a shapefile of the US counties and I want to create buffer zones around the centroid of each county. However, the distance is measured in decimal degrees. As far as I understood, I have to ...
- 19
6
votes
1
answer
1k
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Buffer is too small (OSM Data, EPSG 3857)
I buffered some lines with 100 m in QGIS. When I measured it turns out instead of 100 m its 62. I understand the issue could relate to the CRS. I used EPSG 3857 because the OSM map in the background ...
- 677
0
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1
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105
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Enlarging gBuffer width changes polygon shape
I am having some issues with spTransform and the gBuffer function. I basically have a polygon that I want to buffer with gBuffer (not with st_buffer for other reasons). For some reason the shapefiles ...
- 9
2
votes
1
answer
141
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How to assign a coordinate reference system to x (buffer) datasets of x iterations in a for loop - R
My aims are 1) to create different buffer sizes around three points via a for loop, 2) to assign a coordinate system to each buffer for each iteration, and 3) to store each buffer in a list ...
- 175
0
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1
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171
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Convert unit of measurement for a buffer area
I have generated buffers around geocoded points on a map. The shape areas for buffers are clearly different than the shape areas generated when projecting polygons (such as tracts, CDPs, or counties). ...
3
votes
1
answer
206
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Appropriate distance and CRS
I want to use buffer function using miles or kilometers in Louisiana. I checked Changing unit of measure from degrees to meters in QGIS?. The original CRS is EPSG:4326 - WGS 84 - Geographic and the ...
- 187
1
vote
1
answer
93
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Records density along river network [closed]
This is a quite a complicated problem for me. I'm working with bird records, trying to figure out the eventual density of river bird species along rivers. I've managed to create a layer of records of ...
- 229
3
votes
1
answer
180
views
Deformed shapes after using wedge_buffer as Symbol layer in QGIS
I'm trying to display "field of view" cones on the map, using Geometry Generator as Symbol layer:
wedge_buffer($geometry, dir, specs_angle, specs_distance/200000, 0)
"dir" : ...
- 336
0
votes
1
answer
97
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Buffering like set to lat/lon degrees but layer is set to UTM reprojection - EPSG: 32611
I have two line and point features to buffer. I have reprojected to UTM EPSG: 32611 for both.
Please, see screen capture showing the direct GeoPackage layer properties and not from the Layers window.
...
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