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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22 views

Snap geometry/polygon to grid but maintain general shape

I am working on a project to transform polygons given in a pre-defined precision to a lesser precision, which I think is equivalent to snap them to a fixed spacing grid. For example, in the example ...
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44 views

Is it possible to automatically snap polygons in the same layer in QGIS?

there are similar questions but I still couldn't figure out if it's possible to do this in QGIS. I have a layer with categorized point data (3 categories), I use minimum bounding box/convex hull in ...
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51 views

Snapping objects to grid without grid?

Is there a function to snap new or moved vectors to a (user-defined) grid on the map similar to the AutoCAD snapping-function without generation a point/line/polygon-grid over the whole region first? ...
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1answer
34 views

Failing Unions due to Non-Noded Intersections

I'm trying to perform lots of unions in GeoPandas. I've got around fifty sets of between 7-12 GeoDataFrames of the same place at different times that I'm trying to union into one layer per set. Right ...
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37 views

Merging and snapping shapefiles

I have several large shapefiles from various sources. All cover various sections of oceans and many overlaps, as such the coastline is repeated across the several shapefiles but to varying levels of ...
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60 views

New Features not snappable

I wrote some Tools for CAD in QGIS with python. Therefore I add a special temporary layer with python, if this layer does not exist. That works fine. To add a new feature I start edit, add the feature,...
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1answer
86 views

Merge/join only the lines which are snapped to vertices in QGIS

I have polygons drawn with AutoCAD as Mline (Multiline type) which are rendered in QGIS as 8 segments for each feature. An example of one selected feature is shown in the picture below: I want to ...
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49 views

Snapping line layer to line layer

I'm working on a project where I need to snap an existing line layer to a different line layer. These lines represent streams and rivers. I'm working within QGIS Maderia 3.4 LTR. I've tried using the ...
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25 views

Turning on snapping for edit vertex mode of QGIS

Using QGIS 3.8, I am drawing a line and would like to snap new verticies to another existing layer. I have enabled snapping to other layers in the digitizing settings (see screenshot) What else am I ...
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56 views

Snapping a polygon layer to another layer automatically

I have two polygon layers in QGIS 3.4: Layer A and Layer B. These two layers have been digitized separately. Some features in these two layers are crossing or not meeting each other in some areas ...
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1answer
37 views

Snapping doesn't work - MapInfo Pro 17 (64 bit)

I've experienced a strange behaviour during drawing in MapInfo. Snap function doesn't work. Pressing the S key has no effect. I can't turn off snap. When I start drawing in snap mode, the program ...
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1answer
43 views

ST_SnapToGrid takes a long time on

My ultimate goal is to fetch all points from a 4 million record table that fit within a given rectangle and group the results in clusters. All of the queries I have tried up until now take too long. ...
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23 views

Snap points to nearest line - however limit snapping to polygon the point sits within

I am trying to snap a series of points relative to the nearest line (which i know can be achieved via "Snap geometries to layer", however, i want to restrict snapping to the polygons the points sit ...
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25 views

Snapping value = 0 in Qgis

I am building pipes network, I need check connection between of pipes. I want to pipes must snap and tolerance has value = 0. Is there any tool to check and fix this things. I know Topology Checker ...
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0answers
64 views

Snap GPS coordinates to closest line, get line ID, generate and execute URL

I have a web map in Portal that has a sidewalk line layer. Using Portal, I plan to collect sidewalk deficiencies using GPS (on a Microsoft Surface/Windows 10 device). I would like to add the ...
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19 views

Snap raster to specified coordinate point?

Is there any way to get a raster to snap to a specified coordinate point? The documentation for the snap raster environment setting says: The lower left corner of the given extent is moved to the ...
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35 views

Snap points to nearest polylines within buffer (fast)

This is a working version of snapping any point to nearest polyline within a buffer distance. But, this takes significantly longer as each time it copies the point to a different shape and snaps it. ...
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1answer
49 views

Snapping lines together in QGIS

I'm using QGIS 3.8.2. I have a set of lines which represent a road network. However as I have taken different layers from different data sources the lines which represent the same road don't overlap. ...
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24 views

Snapping together lines within certain tolerance with ArcPy and Basic level license?

I have a GIS layer of bike lanes I created using an open-source GeoJSON which I converted to a shapefile using ArcPy. The end result looks pretty good, with one exception: there is some small gaps ...
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0answers
61 views

Saga GIS Snap Points to Lines tool doesn't produce required results

I have two sets of data that I'm using. Points extracted from a .csv file and a road network from an ESRI .shp file (both of which I've included here: https://send.firefox.com/download/...
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44 views

How do I add vertices on a segment in QGIS 3.9.? Double-clicking doesn't work

I tried adding vertices to segments of a polygon by double-clicking on the segment, but instead of adding a node, the nearest node was moved to the double-click. Clicking on the cross doesn't work ...
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1answer
19 views

Adding points along line by clicking on it using ArcGIS Desktop?

ArcGIS for Desktop 10.6.1. I have a polyline (old railroad track). I'd like to add the train stops as points along it by clicking on the places. I have georeferenced historical maps as the ...
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0answers
24 views

Using V.clean.snap?

I'm working on creating a road network of pedestrian walkways. Since all data were manually drawn, I'll need to snap the vertices together to form a consistent road network on which I can run routing. ...
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1answer
62 views

Combining st_snaptogrid with st_centroid and group by using PostGIS?

I have a table of devices, each of them has a field 'location' that is a postGis geometry(Point,4326) I need to operate a GROUP BY based of the placement on a grid, I'd use ST_SnapToGrid and then I ...
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1answer
66 views

Identify topological errors using FME

I have one single shapefile with many features. There are three different topological errors that I want to be identified (only identified). Line A consists of many segments and some of segments ...
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1answer
74 views

QGIS Snapping buttons missing

I have had no luck snapping points from one layer to another line layer in both QGIS 2.18 and 3.6.3. The snapping plugin is enabled and editing is on for both layers but there are no 'Apply' or 'OK' ...
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1answer
88 views

Snapping to sketch' vertices while editing in QGIS?

I'm trying to digitize buildings in QGIS and encountered a problem: after digitizing several vertices in a sketch, I want to place my final vertex in accordance with the first one - i.e 'square and ...
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1answer
115 views

ST_SnapToGrid doesn't work properly, e.g. 41.94186153740355 -> 41.941861499999995

I'm using ST_SnapToGrid: ST_SnapToGrid(somePoint, 0.0000001) and I get strange result on many points, such as: - POINT (21.619820510769063 41.94186153740355) -> POINT (21.6198205 41....
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1answer
58 views

Harmonize geometry of different shapefiles (QGIS) [closed]

I have got to harmonize the geometry of a big amount of shapefiles in QGIS The files are actually very big. So it would be a lot of work to do it manually. Do you have any suggestions for me?
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0answers
57 views

Snap LineStrings considering direction in QGIS 3

I have 2 projected shape files: Roads (red) and public transit routes (blue): I want to snap the PT routes to the roads, but because of inaccurate marks sometimes the routes are snapped to the wrong ...
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0answers
38 views

Snapping to vertices in vector tile layer using ArcGIS Pro?

I am trying to create features in a geodatabase layer using the tracing tool of ArcGIS Pro. I am able to use other shapefile layers in the project for tracing but vector tile layers loaded from the ...
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1answer
45 views

Making layer visible without having it be snapped to in ArcMap? [closed]

I have one feature created called 'parcel' that shows the borders of houses and another feature called 'conduit'. I need to attach a point feature to the conduit preferably where the parcel boundaries ...
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65 views

pyinstaller stops in the middle of process

I try to create a .exe from a .py script. I use Pyinstaller. The script runs fine with no errors in Pycharm. If I open the .exe my Tkinter opens I can choose the files etc.. And then in the middle of ...
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1answer
401 views

Snap to crossing between lines in OpenLayers

Is it possible to let the snap interaction snap to the crossing of two different lines (or polygons) in OpenLayers? It can snap to vertices and lines between vertices, but I can't see a way to snap ...
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1answer
431 views

Using terrain correction in SNAP sentinel 1 toolbox removes all the values

I am new to SAR image processing, I have a SAR sentinel 1 dataset downloaded from ESA site: S1A_IW_GRDH_1SDV_20190314T030905_20190314T030930_026328_02F196_2EC3 I am trying to do terrain correction ...
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0answers
57 views

How to switch on snap option in QGIS 2.18 when creating customize polygon

How to switch on snap option in QGIS 2.18 when creating customize polygon as in: class customPoly(QgsMapToolEmitPoint): def __init__(self, iface): self.iface = iface QgsMapToolEmitPoint....
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1answer
473 views

Specifying snap raster in QGIS?

I am deploying QGIS 3.6 on Windows 10. Using the Raster > Projections > Warp (Reproject) tool, I need to reproject a single-band, float32, GeoTIFF DEM from EPSG:3413 to EPSG:3857. The output ...
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74 views

ArcGIS not properly tracing a shapefile's polyline feature

I am working with the Street Network Database shapefile from the City of Seattle, in ArcMap 10.6.1. I attempted to use ArcMap's trace function on the polyline representing Rainier Avenue South. ...
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1answer
92 views

QGIS 3.4.4 snapping does not lead to expected topology and st_relate result

I try to snap a line to a polygon boundary. This is working fine, due using the snapping option in QGIS (snap mode vertex and segments & tolerance 0 pixels) Line 1 is snapping to the polygon ...
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0answers
499 views

QGIS 3.4.5 enable trace tool [closed]

I'm using QGIS 3.4.5 and created a line shape layer. I have another line layer in my project that I want to create and trace the geometry of the other layer. I activated the "add line object" button ...
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1answer
281 views

PostGIS snap line segment endpoint to closest other line segment

I have a PostGIS table of singlepart line segments that I've run the ST_ChaikinSmoothing function on. Smoothing all of the line segments worked great, but these simplified geometries created small ...
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0answers
62 views

How to enable tracing in QGIS 3 beyond applications for adding polygon purposes?

I have used the enable tracing feature in QGIS 3 to create new polygons (Add polygon feature), and it works very well. However, i have not been able to use it for other purposes beyond that, for ...
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1answer
107 views

shapely wrong output — when snapping points to line shapefile

I have a series of nodes to be connected to a road network, so as to calculate the cost of transportation. I used shapely to snap the nodes to the road network polylines. Most of the connections ...
1
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1answer
132 views

Filter layerlist in snapping dock of QGIS3 to show only layers selected in the layer-dock (TOC)

I would like to filter the layerlist in the "Snapping and Digitizing Options"-Dock so that only layers are shown which are selected in the TOC of the QGIS-Layer-Dock. At the moment I use a workaround ...
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0answers
45 views

QGIS 3.X CAD tools not working with snapping on PostgreSQL layers?

If I create a scratch layer in EPSG 32720 CAD Tools are working fine with snapping options. The vertex are highlighted etc. etc. If I use a PostgreSQL layer, same EPSG, the snaping is working, but ...
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1answer
394 views

How to snap to a geojson-vt layer (Vector Tile Layer)?

I'm using geojson-vt to render a large geojson (originated from OSM) file. This file contains all road from a state (extracted with overpass-turbo way[highway="*"]). I'm buinding a domain-specific ...
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1answer
63 views

How to snap to intersection of lines with Classic snapping?

The question is as simple as the title. When I am in Edit session with Classic Snapping enabled and want to snap to an intersection of lines, it does not work. In order to achieve this, I have to ...
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0answers
128 views

Snapping geometries to a layer without distortion

I am looking for a plugin / script to snap a polygon layer (A) to a linestring layer (B), the example datasets in image 1. I have tried the 'Snap geometries to layer' tool in QGIS 3.4. This snaps ...
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1answer
243 views

Unable to perform SAGA point snapping to line on Win and Mac

I have been trying to snap points from a shapefile to a line feature from another shapefile. However, each time I do this, I get the following error(s) (depending upon the OS used): (For OSX El ...
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1answer
56 views

Extract By Mask - Raster Horizontal Shift

Is there a way to snap a raster/DEM to a mosaic dataset? I am using the Extract By Mask tool in ArcPro on a mosaic dataset. The output raster's cell values do not match the original mosaic dataset it ...