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Extract Latitude/Longitude from polygon vertices on QGIS

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3

Created a global map by adding the OpenStreetMap and WorldMap layers in QGIS. Drew polygons over that, creating what I believe is a polygon layer.

I've also created a layer of the Nodes/Vertices of the Polygon by clicking Vector->Geometry Tools->Extract Vertices (see photo)

• Would like to extract the latitude and longitude of these polygon points (csv, GeoJSON, or somehow connect to MSQLServer eventually)

I've tried adding calculated fields to the Attribute Tables of the Vertices layer following but am new to GIS and have been unsuccessful.

qgis polygon latitude-longitude

share|improve this question

edited Jul 23 at 23:58

MrXsquared

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asked Jul 23 at 23:20

MariaMaria

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add a comment | 

3

Created a global map by adding the OpenStreetMap and WorldMap layers in QGIS. Drew polygons over that, creating what I believe is a polygon layer.

I've also created a layer of the Nodes/Vertices of the Polygon by clicking Vector->Geometry Tools->Extract Vertices (see photo)

• Would like to extract the latitude and longitude of these polygon points (csv, GeoJSON, or somehow connect to MSQLServer eventually)

I've tried adding calculated fields to the Attribute Tables of the Vertices layer following but am new to GIS and have been unsuccessful.

qgis polygon latitude-longitude

share|improve this question

edited Jul 23 at 23:58

MrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

asked Jul 23 at 23:20

MariaMaria

1822 bronze badges

add a comment | 

Created a global map by adding the OpenStreetMap and WorldMap layers in QGIS. Drew polygons over that, creating what I believe is a polygon layer.

I've also created a layer of the Nodes/Vertices of the Polygon by clicking Vector->Geometry Tools->Extract Vertices (see photo)

• Would like to extract the latitude and longitude of these polygon points (csv, GeoJSON, or somehow connect to MSQLServer eventually)

I've tried adding calculated fields to the Attribute Tables of the Vertices layer following but am new to GIS and have been unsuccessful.

qgis polygon latitude-longitude

share|improve this question

edited Jul 23 at 23:58

MrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

asked Jul 23 at 23:20

MariaMaria

1822 bronze badges

share|improve this question

edited Jul 23 at 23:58

MrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

asked Jul 23 at 23:20

MariaMaria

1822 bronze badges

share|improve this question

edited Jul 23 at 23:58

MrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

asked Jul 23 at 23:20

MariaMaria

1822 bronze badges

edited Jul 23 at 23:58

MrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

edited Jul 23 at 23:58

MrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

asked Jul 23 at 23:20

MariaMaria

1822 bronze badges

asked Jul 23 at 23:20

MariaMaria

1822 bronze badges

2 Answers
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5

Open your attribute table of the layer you want to add this information to and its field calculator. Create a new field with data type double/real and give it a length of 3 and a precision of, lets say, 8. Name it x/lng and y/lat and insert the expression

x(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

for longitude and

y(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

for latitude.

This expression will work with every source crs, so you do not need to care about that. In case your layers crs already is EPSG:4326, it would be enough to just enter the expression $x or $y.

share|improve this answer

answered Jul 23 at 23:54

MrXsquaredMrXsquared

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add a comment | 

1

If you need latitude and longitude as csv you may simply right click your vertices layer and choose Export > Save Features as...:

Then in the dialogue chose Comma Separated Value [CSV] in the combo box on top:

Chose a file name and if applies various restrictions for the output (attributes to export, extent,...). Scroll down and under Layer Options select the output format for your coordinates (here I chose 'AS_XY'). Note the tooltip!

The result will be something like (opened in Notepad++):

share|improve this answer

answered Jul 24 at 5:06

Jochen SchwarzeJochen Schwarze

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add a comment | 

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5

Open your attribute table of the layer you want to add this information to and its field calculator. Create a new field with data type double/real and give it a length of 3 and a precision of, lets say, 8. Name it x/lng and y/lat and insert the expression

x(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

for longitude and

y(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

for latitude.

This expression will work with every source crs, so you do not need to care about that. In case your layers crs already is EPSG:4326, it would be enough to just enter the expression $x or $y.

share|improve this answer

answered Jul 23 at 23:54

MrXsquaredMrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

add a comment | 

5

Open your attribute table of the layer you want to add this information to and its field calculator. Create a new field with data type double/real and give it a length of 3 and a precision of, lets say, 8. Name it x/lng and y/lat and insert the expression

x(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

for longitude and

y(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

for latitude.

This expression will work with every source crs, so you do not need to care about that. In case your layers crs already is EPSG:4326, it would be enough to just enter the expression $x or $y.

share|improve this answer

answered Jul 23 at 23:54

MrXsquaredMrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

add a comment | 

Open your attribute table of the layer you want to add this information to and its field calculator. Create a new field with data type double/real and give it a length of 3 and a precision of, lets say, 8. Name it x/lng and y/lat and insert the expression

x(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

for longitude and

y(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

for latitude.

This expression will work with every source crs, so you do not need to care about that. In case your layers crs already is EPSG:4326, it would be enough to just enter the expression $x or $y.

share|improve this answer

answered Jul 23 at 23:54

MrXsquaredMrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

x(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

y(transform($geometry, layer_property(@layer_name, 'crs'), 'EPSG:4326'))

share|improve this answer

answered Jul 23 at 23:54

MrXsquaredMrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

answered Jul 23 at 23:54

MrXsquaredMrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

answered Jul 23 at 23:54

MrXsquaredMrXsquared

3,40811 gold badge1010 silver badges2626 bronze badges

1

If you need latitude and longitude as csv you may simply right click your vertices layer and choose Export > Save Features as...:

Then in the dialogue chose Comma Separated Value [CSV] in the combo box on top:

Chose a file name and if applies various restrictions for the output (attributes to export, extent,...). Scroll down and under Layer Options select the output format for your coordinates (here I chose 'AS_XY'). Note the tooltip!

The result will be something like (opened in Notepad++):

share|improve this answer

answered Jul 24 at 5:06

Jochen SchwarzeJochen Schwarze

6,98555 gold badges2121 silver badges6767 bronze badges

add a comment | 

1

If you need latitude and longitude as csv you may simply right click your vertices layer and choose Export > Save Features as...:

Then in the dialogue chose Comma Separated Value [CSV] in the combo box on top:

Chose a file name and if applies various restrictions for the output (attributes to export, extent,...). Scroll down and under Layer Options select the output format for your coordinates (here I chose 'AS_XY'). Note the tooltip!

The result will be something like (opened in Notepad++):

share|improve this answer

answered Jul 24 at 5:06

Jochen SchwarzeJochen Schwarze

6,98555 gold badges2121 silver badges6767 bronze badges

add a comment | 

If you need latitude and longitude as csv you may simply right click your vertices layer and choose Export > Save Features as...:

Then in the dialogue chose Comma Separated Value [CSV] in the combo box on top:

Chose a file name and if applies various restrictions for the output (attributes to export, extent,...). Scroll down and under Layer Options select the output format for your coordinates (here I chose 'AS_XY'). Note the tooltip!

The result will be something like (opened in Notepad++):

share|improve this answer

answered Jul 24 at 5:06

Jochen SchwarzeJochen Schwarze

6,98555 gold badges2121 silver badges6767 bronze badges

share|improve this answer

answered Jul 24 at 5:06

Jochen SchwarzeJochen Schwarze

6,98555 gold badges2121 silver badges6767 bronze badges

answered Jul 24 at 5:06

Jochen SchwarzeJochen Schwarze

6,98555 gold badges2121 silver badges6767 bronze badges

answered Jul 24 at 5:06

Jochen SchwarzeJochen Schwarze

6,98555 gold badges2121 silver badges6767 bronze badges