QGIS – How to Export Polygon Coordinates to CSV

coordinatesexportpolygonqgis

I am trying to export polygon coordinates from a shapefile to a CSV file, but so far all my attempts have failed. I have found numerous questions and answers about this, but none have solved my problem.

I have downloaded the file

www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/cultural/ne_10m_admin_0_countries.zip

which is a shapefile containing a basic world map. I have imported the shapefile into QGIS by adding a vector layer, and then I try to export the polygons with coordinates for each country. The tips that I have found suggest either saving the layer by right-clicking it and then selecting Save as or opening the attribute table and copying it into Excel. If I try these I only get master information with one row for each country in the map.

Does anyone know how I can retrieve detail information for each country containing the polygons with coordinates?

Best Answer

Use the plugin MMQGIS to export geometry to csv. I just try with your file, it works perfectly.

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[GIS] Extract all the polygon coordinates from a SpatialPolygonsDataframe

There are several ways to get at all of the coordinates for a SpatialPolygonsDataFrame or a SpatialLinesDataFrame.

Each of these methods records the object and the part within the object from the source, albeit with subtle differences and different names.

Say p is a SpatialPolygonsDataFrame.

#1. coerce to points, then to data frame
# names are Lines.NR Lines.ID Line.NR coords.x1 coords.x2
## start here for polys
lin <- as(p, "SpatialLinesDataFrame")  
## start here for lines
pts <- as.data.frame(as(lin, "SpatialPointsDataFrame"))


#2. convert to matrix 
# names are      object part cump hole         x        y
mpts <- raster::geom(p)

#3. convert to data frame
# names are        long      lat order  hole piece  id group
dpts <- ggplot2::fortify(p)

#4. convert to data frame
## names are   object_ branch_ island_ order_        x_       y_
spts <- spbabel::sptable(p)

Each of these outputs can be used interchangeably as long as you deal with the different name conventions, and for raster::geom remember that it's a matrix. (Actually the coercion one doesn't record the hole/island status so that is less useful depending on what's needed).

You can round trip the last one by

p2 <- spbabel::sp(spts, attr_tab = as.data.frame(p))

(There's an added bonus with spbabel in that you get a 'raster-like' print for the object, but with the data in 'tibble' print form. )

QGIS – Obtaining Information of All Habitats Within an Area

Zonal Histogram. Output will contain one column with pixel count for each raster value
Multiple Field Calculators or one Refactor fields to create new columns with percentages for each class.

Best Answer

Related Solutions

[GIS] Extract all the polygon coordinates from a SpatialPolygonsDataframe

QGIS – Obtaining Information of All Habitats Within an Area

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