Questions tagged [point]

A geometric element defined by a pair of x,y coordinates.

Filter by
Sorted by
Tagged with
58 votes
7 answers
164k views

Getting list of coordinates for points in layer using QGIS?

I've got a layer in QGIS that is comprised of points. Its attribute table doesn't have (show) the corresponding x and y coordinates for each point. Is there a way for me to extract a list of ...
hpy's user avatar
  • 3,157
32 votes
13 answers
99k views

Extracting raster values at points using Open Source GIS?

How can I extract values from a raster by points? I prefer not in Arcgis. I prefer in Qgis or Mapwindow or other open source gis.
Vassilis's user avatar
  • 3,444
37 votes
9 answers
91k views

Calculating latitude and longitude of points using QGIS

How do I easily calculate the lat/long of points using the QGIS Field Calculator? I saw a previous related question (Using QGIS API and Python, to return latitude and longitude of point?), but it ...
djq's user avatar
  • 16.3k
9 votes
3 answers
8k views

Normalizing point cloud data

How I can get Digital Height Model (only object heights, DSM - DTM = DHM)? Many applications can do this, but they convert it to GRID or TIN format. I was wondering if it was possible to keep the ...
Zia's user avatar
  • 181
27 votes
5 answers
41k views

Nearest distance between point and line layers in QGIS

I have two layers, a line and a point layer. I need to make a line layer which connects all the points to the nearest line feature. How can I do that? Is there a plugin available for QGIS? This is a ...
Frodo's user avatar
  • 2,407
40 votes
5 answers
30k views

Joining attributes from nearest point in QGIS?

I have two layers with points, call them A and B, each with different attributes. For each point in A I want to join all the attributes from the nearest point in B. Ideally this would also include a ...
Fred's user avatar
  • 682
20 votes
2 answers
15k views

Calculating distance to points in QGIS

Is there a way of calculating the distance to the nearest points in QGIS? In ArcGIS Desktop there is a function called Euclidean Distance, which can take an input vector or raster, and generate a ...
djq's user avatar
  • 16.3k
19 votes
6 answers
22k views

How to randomly subset X% of selected points?

What methods are available in ArcGIS 10.2 to randomly subset a selection of points. For example, in the attached screenshot I am interested in keeping 20% of the selected points and deleting the rest....
Aaron's user avatar
  • 51.6k
15 votes
3 answers
2k views

Convert vertices of polygon features to points using Virtual Layer in QGIS

I have a polygon layer and want to use a Virtual Layer that creates points from the vertices of the polygon layer. The question is how to write a query that does this? I am aware of the tool "...
Babel's user avatar
  • 70.6k
8 votes
6 answers
3k views

Creating all possible line segments between all points using QGIS

I want to connect all points in a point feature with every possible line segment using QGIS. For example, how a pentagon has five points with ten line segments connecting them all to form a pentagram ...
qu4ntumrush's user avatar
41 votes
6 answers
119k views

Drawing lines from points in QGIS

I have a point layer and need to draw a line passing through or in the vicinity of the points (up to 0.5m distance between the point and the line). The nodes of the line will receive the attributes of ...
H.Wiener's user avatar
  • 1,009
31 votes
7 answers
13k views

Calculating intersection of two Circles

I'm trying to figure out how to mathematically derive the common points of two intersecting circles on earth's surface given a center Lat/Lon and a radius for each point. For example, given: Lat/Lon ...
Will's user avatar
  • 311
26 votes
9 answers
20k views

How can I convert an excel file with x, y columns to a shapefile?

How can I convert an excel file with x, y columns to a point shapefile? There are some somewhat optional requirements in addition to the correct creation of a shapefile: Column types (as per Excel's ...
fmark's user avatar
  • 9,381
19 votes
5 answers
28k views

Converting polygon into single or all points in QGIS

I want to convert polygons into points using QGIS. I know how it's done in ArcGIS Desktop. How can I implement it using QGIS?
Lukas's user avatar
  • 717
13 votes
4 answers
18k views

Getting all the points of polyline

I have some polyline feature objects in Python. Now I want to get all the points of polylines. For example, if a polyline has start point [0,0] end point [5,5]. Result: [1,1];[2,2];[3,3];[4,4];[5,5]. ...
user's user avatar
  • 1,337
13 votes
5 answers
16k views

Calculating distance of point along line using QGIS

I have a polyline (movement path) and points recorded along the line. I would like to calculate for each point the distance along the line in QGIS. I hope for a result which will add a new column to ...
Gabz's user avatar
  • 131
8 votes
2 answers
2k views

Finding nearest neighbor for each point in the same table

We've got a table of approximately 300,000 points and would like to find the nearest neighbor (within 10km) to each point in the same table. The most efficient query we've found so far is below, but ...
cokrzys's user avatar
  • 657
88 votes
13 answers
243k views

Creating point features with exact coordinates in QGIS

How do I create point features with exact (manually entered) coordinates in QGIS? I get precise GPS coordinates from a survey team which I need to add to a point layer. What I want: add point, type in ...
Per Engstrom's user avatar
39 votes
12 answers
13k views

Creating regular point grid inside polygon in PostGIS

How to create, inside a polygon, a regular grid of point spaced x,y in PostGIS? Like the example:
Pablo's user avatar
  • 9,827
25 votes
5 answers
44k views

Finding distance of point along polyline using ArcGIS Desktop?

We need to find the distance of a series of point along a given polyline. We have a polyline dataset repsenting rivers in a catchment, broken up into river reaches (FID 1 through 35 for example). We ...
user avatar
16 votes
4 answers
13k views

Creating perpendicular lines on line using QGIS

In QGIS I want to create perpendicular Lines on another Line (River). The Lines should be created on points on the Line and should have a length of 40 Meters. I want to create the red lines in the ...
KartenLappen's user avatar
13 votes
3 answers
15k views

Splitting line layer using another point layer in QGIS

How to split a line layer using another point layer in QGIS? I have one point layer and one line layer. I want to split the line layer between two points (those two points belongs to point layer) ...
vani's user avatar
  • 171
12 votes
5 answers
18k views

Generating start and end points for LineStrings

I want to create start and endpoints in QGIS for a Linestring shapefile. I tried using the "QChainage Plugin" but was not useful. Can someone suggest a tool?
Duffer's user avatar
  • 453
8 votes
3 answers
6k views

Drawing outline of point cloud using QGIS

I want to know if there is a plugin in QGIS, which will allow me to draw the outline a point cloud. I know there is Points2One plugin, but it makes an outline with all points, even with the data found ...
tazrart's user avatar
  • 81
6 votes
4 answers
3k views

Generating line segments between all points using QGIS

How do I create a vector layer with a network of line segments drawn between every point in another vector layer? Basically, I am trying to create something similar to a hub/spoke network, except that ...
Nick_W's user avatar
  • 565
6 votes
1 answer
4k views

Getting coordinates of point on mouse click using PyQGIS

I want to get x/y coordinates of a point on mouse click for a point and need to use those coordinates to evaluate other values as per other modules already define. How can I get x/y coordinates on ...
sudhanshud's user avatar
17 votes
5 answers
5k views

Seeking algorithm to place maximum number of points within constrained area at minimum spacing?

I have a polygon layer that describes a constraint; I wish to add points within this area. I want to add as many points as possible, but they must have a minimum spacing between them. Is it possible ...
Matthew Snape's user avatar
14 votes
2 answers
6k views

Moving points onto lines (~neighborhood)

I do have two vector layer, of which one is a point layer based on "events" by remote sensing and the second one is a line layer from local research. In my case these are earthquakes and tectonic ...
Chris Pallasch's user avatar
12 votes
2 answers
7k views

Computing UTM Zone from lat/long point

I am trying to convert a latitude/longitude point to UTM. To define UTM projection, I need to calculate zone for the point. I am trying to figure out the best way to do this. One way to do this would ...
jayGIS's user avatar
  • 501
11 votes
7 answers
22k views

Getting image pop ups in QGIS

I have a map of an area and georeferenced photos. I need to be able to bring the pictures as points and then be able to click at a certain point and an image pop up. I have revisited this issue, i ...
totros airways's user avatar
11 votes
3 answers
4k views

Converting point layer to raster grid that shows frequency of points per cell uisng QGIS

I have a point layer that shows the distribution of a species. Is it possible in QGIS to convert this point layer to a raster grid in which the value of each cell corresponds with the amount of ...
Murphy's user avatar
  • 165
10 votes
2 answers
2k views

Representing uneven tree canopy spread around point in QGIS

I am trying to make an attribute to show the uneven spread of the crown of a tree using the four cardinal points. I can use a buffer to show one feature, in this case a root protection area. But I ...
Island Lescure's user avatar
9 votes
6 answers
37k views

Representing several points with same coordinates on map using ArcGIS Desktop? [duplicate]

I'm working on Arcgis 10. I have a point shapefile representing events with several points having coinciding coordinates (They have the same coordinates). For representing them in a dynamic way, I ...
jonatr's user avatar
  • 3,185
44 votes
7 answers
21k views

Comparing two spatial point patterns?

If I have two point pattern distributions within the same geographic region, how would I go about visually and quantitatively comparing those two distributions? Also assume I have many points within ...
Andy W's user avatar
  • 4,234
17 votes
2 answers
6k views

Detecting if point is on left or right side of line in PostGIS?

I have a linestring table and a point table in postgis. I know the closest line to any given point. What I need to know is on which "side" of that line is the point. I guess I have to do that by ...
mofoyoda's user avatar
  • 883
11 votes
1 answer
29k views

Creating DEM from Point Data using QGIS?

My boss gave me a small 3D-point-shapefile and asked me to make an DEM from it, which I should put together with an older DEM of the same site, which was made with Surfer. I created a raster-layer ...
Lukas's user avatar
  • 111
10 votes
1 answer
833 views

Re-locating points randomly at certain distance in QGIS

I have GPS coordinates which identify aid projects in Africa. Now, I want to re-locate these projects, such that each project is re-located by 100 km in a random direction from its original location. (...
Franziska's user avatar
  • 119
8 votes
2 answers
2k views

Prevent the Feature Attributes dialog box in QGIS

Any time I am inserting new point feature in QGIS, the Feature Attribute dialog box is popping up. Is there a way to prevent it? (I am willing to insert many points at once and this pop up box slows ...
Guy 's user avatar
  • 443
8 votes
3 answers
9k views

Adding "noise" to overlapping X,Y coordinates so no longer in EXACT same place?

I have a series of points representing animal observations. Many of them overlap, having the exact same coordinates, and this is causing me trouble when I want to run some analytical tools which ...
Noe's user avatar
  • 81
7 votes
4 answers
2k views

Displaying multipoint features as polygon using QGIS

Is there an easy way to show/connect a group of points on a multipoint shapefile layer as if they were a polygon? I'm collecting points for a plant study, and some of the points are gathered as a ...
CEL-ma's user avatar
  • 1,015
4 votes
3 answers
10k views

How do I plot points as graduated/proportional circles in R?

I'm back again with more R mapping questions! This one is concerning symbolizing points by a certain attribute with graduated/proportional circles. DATA: My full code can be found here if you're ...
Lauren's user avatar
  • 1,882
4 votes
1 answer
2k views

Mapping polygons into lines and projecting lines on road network

I have a layer with polygons that describe road damages. I have then another layer with road network lines. The layers are shown in the picture. I need to project the polygons as lines to the road ...
krltos's user avatar
  • 223
14 votes
1 answer
4k views

How can I transform polylines into points every n metres in PostGIS?

Question in pretty much the same as this, but I need to use PostGIS. I have a number of polylines, and want to trasform them into points every n metres along these lines. edit: Thanks a lot to ...
culebrón's user avatar
  • 2,314
13 votes
3 answers
8k views

Is it possible to create a point within a Polygon (not a centroid)?

Is it possible (without writing Python code - sorry I'm not a developer) to create a point layer from a polygon layer but ensure the point is within the polygon? The ftools centroid tool is cool but ...
Colin's user avatar
  • 787
12 votes
1 answer
10k views

Displaying overlapping points in QGIS

I am trying to produce a map of last years emergency responses in my area in 2018. I am entering a CSV file into QGIS which is working fine. The addresses and Lat and Long have been verified. I have ...
Ken's user avatar
  • 121
10 votes
3 answers
7k views

Drawing lines from two points in CSV using QGIS?

I have a CSV file where one line looks like this: Duration, user, lat-start, long-start, lat-end, long-end 298, Casual,38.9101,-77.0444,38.91554,-77.03818 Each row in the CSV has two points and I ...
lindzcook's user avatar
  • 101
9 votes
3 answers
17k views

Retrieving start and end point coordinates with ArcPy? [closed]

How do I retrieve start and end point coordinates with ArcPy for a polyline feature class? I expect to pass a segment identifier to a subroutine and have it pass back start and end coordinates. The ...
Ivar Husa's user avatar
8 votes
3 answers
4k views

Finding point closest to point on near feature?

I have a dataset osmMajor containing road data (from OSM; 670,780 features) and another dataset points containing some points of interest (500,000 points). For each feature in my point layer, I want ...
Damien's user avatar
  • 905
7 votes
1 answer
3k views

Labeling only one duplicate attribute without editing original data in QGIS

I have several points (e.g. 4 bus stop positions) in one area. They all belong to the same station, so they all have the same "name" attribute. To avoid a mess of labels showing all the same ...
MrXsquared's user avatar
  • 33.9k
5 votes
1 answer
1k views

Rotating point layer according to line layer in QGIS

I got two layers: (1) a line layer with water pipelines and (2) a point layer that shows hydrants and so forth. The points are located, mostly, on the line layer. For the symbology of the hydrants i ...
Nunkuat's user avatar
  • 485

1
2 3 4 5
9