All Questions
117
questions
1
vote
1
answer
628
views
draw multipart polygon with one surrounding border
As you can see on the image below, the waterbody is divided by the border line because it consists of several polygons.
I could merge the polygon, but I dont want to change the shapefile.
Is there a ...
- 8,338
1
vote
1
answer
3k
views
How to extract geo data out of a polygon shapefile into CSV KWT [duplicate]
I have a polygon shapefile
that contains all the neighbourhoods in the Netherlands.
My aim is to export the neighbourhoods and coordinates to CSV file (KWT).
Without success I tried (with QGIS) ...
- 11
2
votes
3
answers
3k
views
Shapefile with overlapping polygons: calculate average values
I have a very big polygon shapefile with hundreds of features, often overlapping each other. Each of these features has a value stored in the attribute table. I simply need to calculate the average ...
- 730
1
vote
1
answer
755
views
Polygon grid shapefile for landmass
I am interested in generating a polygon grid shapefile for the landmass of the world. What I have presently is two tables in PostgreSQL:
Table 1: Coastal area shapefile (http://openstreetmapdata.com/...
- 179
0
votes
1
answer
128
views
Polygons Shrinking and Moving as if CRS Was Suddenly Out of Sync with Project
I long ago set the CRS for a linguistic geography project I'm working on involving Oklahoma data (EPSG:2836 - NAD83(HARN) / Oklahoma North), and I have been closely monitoring that the polygon ...
3
votes
2
answers
1k
views
Sum of point attributes inside hexagons using QGIS UI
I have a point shapefile that corresponds to locations of animals captured. I've joined a table to this shapefile with additional information on each attribute, namely nb. animals caught in each point....
- 31
5
votes
3
answers
2k
views
How to combine stacked polygons within a shapefile?
The image below shows my shp-file. Every polygon has the same transparent color. So a darker blue means, that several polygons are stacked! How do I cut every polygon with each other so no polygons ...
- 8,338
4
votes
3
answers
3k
views
How to subset X number of features from shapefile in QGIS
I'm looking for a means to take a rather large shapefile and split it out into separate, smaller shapefiles based on number of features. So for example, if I have a file with 1 million features, ...
- 61
0
votes
1
answer
270
views
Getting information from one shapefile to another using QGIS
I am very new to GIS and learning by myself.
I am using QGIS.
I have a shapefile, which categorizes areas (land cover) by numbers (corresponding to land cover classes).
I have created a wkt file ...
- 129
4
votes
2
answers
9k
views
How to edit Shapefile Attributes?
How might I go about exporting a polygon shapefile (e.g. CSV) so that attributes (not geometry) are editable by others, and importing it with the changed attributes (of which there are several columns ...
- 506
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
2
votes
1
answer
198
views
How to digitize from a map with additional detail views?
I have a map with a river that includes islands within it. Some islands have a blown up version (detail views) outside of the river showing land ownership details.
I would like to make polygons (...
- 111