Questions tagged [snapping]

Automatic process of moving points or features to match or coincide exactly with coordinates of another feature within a specified distance, or tolerance

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29 views

ST_LineInterpolatePoint Error - Does not exist

I am having an issue 'snapping' a points layer (be - bristol education) onto a road network (br - bristol_roads). I have created the code below using the PostGIS in Action guidebook as a reference ...
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18 views

Enabling snapping on features created with PyQGIS

I have implemented a custom digitizing tool derivated from QgsMapToolDigitizeFeature class. Here is the code written to save the feature into the layer: layer.dataProvider().addFeatures([feature]) ...
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34 views

How can I snap lines together, but only when there is nothing in between them?

I am mapping arable field boundaries, to see where hedges might go. I already have lines drawn round the edges of every arable field. However this creates too many lines as it gives me a boundary ...
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18 views

Snappy not importing to Python

I downloaded SNAP, but mostly just because I want to mess around with Snappy. I see the Snappy executable file in the bin folder after the installation, but I can't call the module when I try to ...
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10 views

Using ST_snap to snap pairs of points

I am using the following script to snap a set of point to another within a certain distance. The script works but there are some pairs of points that don't overlap even though the distance between ...
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1answer
27 views

Extracting Vertices / Snapping to points from Vector Tile Service (VTS) Layer

I am using a new vector tile service for background mapping. I can select/interrogate individual objects from the vector layer with the info tool - but they're not recognised by the snapping tool. I ...
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1answer
34 views

Problems with cleaning the topology of a shapefile using GRASS tools and snapping tools

I have a shapefile with almost 1000 polygons (each polygon representing a farm). There are a lot of topological errors (gaps/slivers and overlaps between polygons). Below is a "zoomed in" ...
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1answer
26 views

Snap to disabled layers problem - QGIS [closed]

I'm having some trouble with QGIS because when I try to edit a vector, it displays the edges in that point of all the layers loaded in the drawing even though they are off, making it almost impossible ...
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1answer
24 views

Merging Lines - up to 200ft distance

I have inherited data that is in need of the lines to be in the same place. Unfortunately this is not how the data was made. I have been moving these by hand. Is there a tool that will arbitrarily ...
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2answers
82 views

Attaching vertex or polygon to line in QGIS

I want to connect the green polygon and the blue line. The buffer tool is not suitable because it makes the whole shape bigger. I'd like to make longer the length of the green one to attach to the ...
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33 views

Finding a pour point in a polygon?

I have a polygon shapefile (created by someone else) that is a bunch of little watersheds. Unfortunately, it doesn't include any coordinates in the attribute table for the lat/long of the pour point ...
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45 views

Remove gaps between polygons of a shapefile [duplicate]

I have extracted a polygon shapefile using raster to vector tool from TIFF image, and it has produced polygons from the Raster, but it has also generated the gaps between the polygons as attached in ...
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1answer
22 views

Snapping options with Move Feature in QGIS3

Is it possible to snap (i.e. precisely align) features when using the 'move feature' tool in QGIS3? I understand that you couldn't in earlier versions but wondered whether it was possible now. Someone ...
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1answer
61 views

Automatically join lines by snap

After I smoothed a layer of lines I lost the connection with some vertices. Is there an automatic way to connect the various lines to avoid doing it manually? I think the best thing is to use v....
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1answer
81 views

QGIS snapping issue

I'm facing the issue when I use the snapping tool at line layer in qgis. I turned on "snapping to segments" and then i've drawn that green lines (picture below) which touches other (purple) ...
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1answer
21 views

Snapping polygon to raster cells using ArcMap

I'm working with raster datasets that all share the same raster cells. I have a polygon that clips out an area of interest from these datasets, but it isn't aligned with the raster cells. Is there a ...
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36 views

Creating polygons via snapping to circle line

I am trying to digitalize my research areas. Those do have a radius of 250m which I created via the buffer and polygons to lines functions. Now I try to create polygons with the different land uses. ...
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47 views

Postgis - Splitting polygon with line returns different size polygons that creates holes/overlaps

It feels like I've been struggling with this 'simple' problem for years, hopefully it is just a noob mistake.. We are using Postgis to facilitate an interface we wrote to do spatial editing, like ...
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0answers
52 views

How to detect snapping event while editing layer in QGIS? (For custom topological control)

QGIS 3.14 - plugin. I have a requirement to draw lines which must start and end snapped to point geometries of another layer. I need to be able to detect a vertex snap event while drawing linear ...
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40 views

Shapely adds more vertices to a polygon for smother snapping

I'm using shapely to snap together some polygons. The problem is that snapping in shapley only supports vertices to vertices snapping (i.e. a vertices from a polygon can only ever snapped to the ...
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1answer
37 views

Snapping two topology layers together based on point

In QGIS 3.14.15 with GRASS 7.8.3 I have two layers both with correct topology that function how they should. When using the Network Analysis > Service Area tool, they work as they are supposed to. ...
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1answer
43 views

Snapping lines to points according to attribute field value with PyQGIS

I would like to snap line features (.shp) to the corresponding point features based on a common attribute field they have (and not according to any distance). I have around 150 different attribute ...
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0answers
25 views

QGIS - using fill ring and snapping to segments not working

When using the fill ring tool and having to run along the edge of the polygon the fill ring tool works perfectly when snapping to a vertex, but when I try and snap to a segment, which appears to work ...
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29 views

QGIS Linear Z interpolation on snapping

The interpolation of the Z value when snapping in the creation of a new feature is done well in QGIS 3.14, but when editing elements this does not happen. Is there any way to do it?
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1answer
72 views

Snap Geometry to Layer (Line to Point) does not snap all lines within the tolerance limit

I've been using QGIS 3.14 version to snap geometries to layer. When I try to run this, I have to fix the geometry first before I run select by location. I checked the output, most are correct but ...
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1answer
32 views

Entering digitizing mode makes QGIS freeze [closed]

When I toggle the editing mode QGIS freezes. The layer is stored in PostGIS. I'm using QGIS 3.10.
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2answers
99 views

Snapping to currently digitized feature using QGIS

In QGIS 3.14 there's a new feature "Snapping to the currently digitized feature". This feature is demonstrated within a gif on the QGIS website (also shown below). How can this feature be ...
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1answer
139 views

Match up two polygon layers in QGIS

I have two polygon layers, one is from natural earth data (Administrative 1 division) and the other is a polygon layer with some historical regions in Europe. As you can see in the image attached ...
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18 views

Reproject soil moisture product L3 from SMOS (SM_RE04_MIR_CLF33A) from Ease Grid 2 to other map projections

I need to re project soil moisture product L3 (SM_RE04_MIR_CLF33A) (NC file) from Ease Grid 2 to other map projections. Is there any way to do that? What software can I use?
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2answers
217 views

Update points geometry while snapping them to nearest line

I have two tables in the PostGIS database - points and lines. And I want to update points geometry to snap them to line if they lay within a certain distance. By now I managed to create a new table ...
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1answer
72 views

Enabling/disabling Avoid Interception snapping functionality in Individual Layer Settings with PyQGIS

How is it possible to change the "Avoid Intersections" parameter with PyQGIS in QGIS 3.10? I want to enable "avoid interceptions", so that in edit mode, when the new polygon ...
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0answers
32 views

How do I manipulate a line layer to have straight features instead of curves?

I am working with a layer (in yellow) that i want to make follow the red line. I have tried: Snapping - this results in geometry issues where a line intersects itself Smooth - has no effect ...
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1answer
67 views

Split line at newly created point feature

I have one Point layer and Multiple line layers. I always wants to Maintain Topology between them. For which, If user adds any new feature in Point Layer, exactly snapped with line feature, the line ...
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1answer
134 views

Snap to shapes Google Maps

I wish to add snap to shape feature of openlayers shown here Snap Interaction to Google Maps drawing Library. Is there a way that this can be achieved. Here is the bare bone code of the Google Maps ...
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1answer
60 views

Use tracing when extending linestrings in QGIS

In QGIS 3 it is possible to extend an existing linestring by clicking on the 'virtual endpoint' cross marker as described in https://docs.qgis.org/3.10/de/docs/user_manual/working_with_vector/...
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1answer
25 views

Cut linestring segment at centroid in PostGIS

In a table of linestring three segments are connected. first--second--third could Postgis generate the centroid of second segment and merge first and third at center? Is it possible? first--...
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19 views

Snapping Large Amount of Points To A Specific Location or Vertices

I am wondering about moving a large amount of points that represent power pylons and need to move them to the base of the pylon in the imagery that I'm using. I was thinking about using the spatial ...
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1answer
224 views

Snap geometry in QGIS

I have a problem, but I didn't find usable solution. I created a line shape as a reference/guideline and made grid with grass v.mkgrid and I should correctly fit the grid onto the line. It isn't ...
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0answers
40 views

Snapping tool issues on QGIS 3.12: Virtual polygons between two edges

I am digitizing land use inside some cadastral parcels. I have two polygon layers, one for the parcels, and one for land use. Since I don't want to digitize outside the parcels, I used the snapping ...
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0answers
75 views

How to snap polygons within a large polygon hole

I'm trying to perform a snap operation to fill the white holes and remove the intersections made by a previous shapely simplify operation. Here's one example to the occurrence: There is the code I am ...
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3answers
330 views

Snapping points outside a polygon to the polygons in R

I have records of where certain species breed on mainland New Zealand and I want to model where these tend to be. However, partly due to some projection errors, as well as potential measurement errors,...
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23 views

Point snapping distance

I have question -i need very easy shift 1 point. It is very difficult in new version. 1.Why I can't shift point closer like red distance? Between red and yellow is not possible snapp. Blue is what I ...
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0answers
33 views

Snapping KML to shapefile in QGIS

I have created a route using Google My Maps and put the route KML file into QGIS. But the point and lines seem doesn't perfectly match the shapefile. Is there any solution I can make my route ...
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0answers
36 views

Connect points based on underlying road network in QGIS

I have a road network layer. I also have the latitude and longitude of the bus stops in that road network. I want to connect a series of these stops but not using straight lines but via the underlying ...
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0answers
97 views

Joining non-contiguous polygons in QGIS

I am trying to "physically" join non-contiguous polygons of the same layer to form one (when the polygons are spaced less than 5m), without distorting the original shape. This is a building layer, ...
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1answer
229 views

'Snapping to segments' does not work in QGIS 3.10 and 3.4

QGIS 3.x does not let me snap to vertice and segment anymore, only vertices. I changed the snapping options several times in the toolbar and in the options menu. Made sure the correct layers are ...
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2answers
179 views

Snap a point to a line and get the line ID (using the ArcGIS REST API)

I have an external work order management system in which users create new sidewalk work orders (points). When a user creates a sidewalk work order, a Jython script will invoke a URL that passes the X ...
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0answers
11 views

Network Analyst Tool - Closest Facility

It's the first time I use the Network Analyst Tool (Closest Facility) in ArcGIS (version Desktop 10.6.1) and I ve just faced this kind of issue. I have two point shapefiles (for example, the "...
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0answers
17 views

Sentinel 2 Conversion Relectance to Radiance?

Sentinel 2a level 2 digital number is a surface BOA reflectance. I want to convert this number to radiance, how should I do it? I use ArcGIS or Snap (there is reflectance to radiance but it requires ...
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1answer
97 views

Snapping in QGIS

I have a Layer and I have lines as if they were the sidewalks, so for every street I have two lines. The problem is that some of the lines are not joined, how could I join them?

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