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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26
votes
7answers
29k views

Removing small spaces (slivers) between polygons?

I have a set of polygons representing administrative districts. The districts were digitized by hand, and there are small spaces (slivers) between polygons where the polygons should be touching. How ...
16
votes
9answers
13k views

Why won't ArcMap 10 snap?

I'm really confused by this. ArcMap will seeminly randomly decide to not allow snapping when editing. Sometimes its only for certain features, sometimes for only parts of the same feature (e.g. one ...
16
votes
5answers
2k views

Algorithm to fix topological errors in GIS software apps

Related question here. I notice that ensuring topological correctness is essential for GIS applications, this is because the input from user or polygon boolean operation can have severe topological ...
15
votes
3answers
6k views

How to snap lines to points automatically?

I have two vector shapefiles: One file is points representing manholes and the other is a polyline file representing pipes leading to and from the manholes. I need to snap the lines within a ...
14
votes
0answers
352 views

How to implement a “Snap to Road”-functionality? [duplicate]

I am having a problem with a little application I'm trying to develop. What I do is take a phone with me and drive around the city on a bike. I collect all the Latitude/Longitude-pairs and at home I ...
12
votes
1answer
436 views

How to maintain integrity between changing street network and geocoded points?

We maintain hundreds of thousands of points geocoded against a dual-centerline Navteq street network. We are faced with the challenge of maintaining referential integrity between our points and the ...
11
votes
1answer
858 views

Snap line layer to network in QGIS or PostGIS

I have GPS data I've taken of bus routes, and now I'd like to snap it to my road network. Both layers are line layers in a PostGIS DB. I'd like to use either QGIS or PostGIS, but if I have to go with ...
10
votes
4answers
18k views

Tool or process to automatically snap endpoints of polylines within given proximity using ArcMap?

I created a network of polylines that were all supposed to be connected. However, I just realized that many of the endpoints of the lines aren't connected, but are very close. I think there should ...
10
votes
1answer
12k views

How to enable “snapping” in Quantum-GIS while drawing polygons?

I tried to draw polygons in qgis-1.7.0 and I somehow can't find or failed to find the "snapping" option. I'm used to ArcGIS-10.0 where you have some snapping options, like placing points of polygons ...
10
votes
3answers
928 views

Real time map matching using ArcGIS Desktop?

I am working on a project which requires real time map matching. I am currently using ArcGIS but not sure whether it will work. Here is what happens with my system: the cell phones sent GPS fixes ...
9
votes
5answers
18k views

Snapping points to lines in ArcGIS Desktop and automate using VBA?

I use ArcGIS Desktop and I want create a network with a point feature and a line feature. I need my point features to be on the line features so I should do Snap point to line. However, I do not ...
7
votes
3answers
1k views

Snapping start- and end nodes of lines to other lines in PostGIS

There are plenty examples that show how to snap lines to points, but I haven't been able to find any (fast!) way of snapping the start- and end nodes of line strings to nodes of other lines. ...
7
votes
1answer
1k views

Is there a way to automatically snap loose points of lines to close by vertices with Quantum GIS?

I have a vector layer of lines that were drawn with the snapping option off. I need to have them snapped but, there are hundreds of lines. Is there any solution to do this automatically or ...
7
votes
4answers
4k views

How to close multipart polyline gaps in ArcMap

I have a multiple multipart contour lines that originally came from CAD drawing. I converted these into a polyline shapefile in ArcGIS. The issue I have is with gap in each contour lines that are ...
6
votes
1answer
792 views

How can I snap lines in PostGIS?

I have a few linestrings that together form a long line. The start- and endpoints of the linestrings are equal with their direct neighbour, but when tested the ST_Distance between any 2 lines is like ...
6
votes
1answer
737 views

Measuring Right of Way in ArcGIS Desktop?

I'm helping bring CAD people into ArcGIS so that everyone throughout the company is on the same page and there is one database for everything. Right now, one of the biggest hurdles is making sure all ...
6
votes
2answers
107 views

Snapping leaves small gap between features in ArcGIS for Desktop?

I'm using classic snapping in ArcGIS 10.1. At the scale (1:5,000) that I'm using to snap the edge of one rectangular feature to the edge of another rectangular feature, snapping seems to work fine. ...
5
votes
1answer
2k views

Move Polygons with snap from edge to edge

I have such a basic question, but can't find any solution. I have some hundred rectangular Polygons and want to move them to other, already existing Polygons. The borders of these polygons should ...
5
votes
2answers
293 views

3D snapping in open source platforms

I'm looking for tools and extensions in open source platforms (gvSIG, QGIS, uDig, etc) that allows 3D snapping. In the last years, most of the projects my company is working on required the editing ...
5
votes
2answers
7k views

snapping polygons and lines

I recently downloaded QGIS on a Mac OSX 10.7.4 (lion) and purchased a master map shape file, of a particular area. I am trying to divide it into polygons following features on the master map vector ...
4
votes
3answers
628 views

Is it possible to perform automatic snapping of polygons in QGIS or ArcGIS?

Note: in the picture below white space between the polygons is blank space – it does not contain any polygons as a result of Intersect or Union functions.
4
votes
4answers
564 views

Is there a way to snap to apparent intersections in ArcGIS 10.1+?

Suppose there are two lines in an ArcMap 10.1 or 10.2 editing session that cross but do not intersect, per se. This is the case when new lines a drawn. Is there a way to snap to the point where the ...
4
votes
1answer
515 views

Snapping doesn't work when many layers loaded!

I am using Arcmap 10, when I have only limited number of layers loaded, the snapping experience is perfect but when I have many layers loaded specially polygons, snapping process is painful. My cursor ...
4
votes
1answer
801 views

Snap points to line and calculate chainage using Open source GIS

I have a line layer (representing a pipeline) and a points layer (representing valves) and I would like to calculate the chainage of the valves along the pipeline. I assume that I would first need ...
4
votes
1answer
193 views

Showing snapping error in ArcGIS Online

I am doing some test in ArcGIS online to know how much helpful it is for my firm, But when I opened my road line .Zip shapefile in ArcGIS online it is showing some snapping issues as well as changed ...
4
votes
1answer
396 views

Excluding layers from snapping using IPointSnapper

I'm working with ArcObjects in C#, and am trying to exclude all map layers but one (the only one I want to snap to) from the snapping environment. I'm using the ISnappingEnvironment and IPointSnapper ...
3
votes
1answer
144 views

Is there an alternative to the Integrate tool that will not change one of the inputs

I have two polygon layers, and would like to snap the outlines of one of them (colored poly's) to the other (grey) without changing the grey in anyway (so Integrate seems out). It should only snap if ...
3
votes
1answer
633 views

How to snap lines to nearest point?

Is there an easy way to snap lines to nearest point of either a line or a polygon? I don't see any snapping options for line layers as suggested on How to merge lines with slightly different endpoints ...
3
votes
2answers
2k views

ERROR 000800 when trying to snap points layer to line or buffer layer

I am very new to GIS, so go easy on me. I am using ArcCatalog 10.0 and trying to snap a set of points to another layer that has roads in it. The points represent 10th miles along the road. Here are ...
3
votes
1answer
572 views

Leaflet snap circle draw to marker

I am looking for ideas/libraries that enable snapping when I create a circle with leaflet draw. There is the libaray Leaflet snap, that enables snapping of draggable markers to polylines and other ...
3
votes
3answers
504 views

What is the ArcGIS equivalent to WEED tolerance?

Example: User is digitising new (line, poly) features and accidentally adds additional vertices within very small distance of previous vertex, resulting in redundant vertices. I want to prevent this ...
3
votes
1answer
71 views

Snapping of ArcGIS Online features fails in ArcGIS pro

I'd like to edit a feature-layer that is published in ArcGIS Online with ArcGIS pro. I urgently require the snapping function. However, after enabling snapping I can only snap to the feature that is ...
3
votes
1answer
266 views

how to snap two line vertex in two different layers used in QGIS

I want to snap between two poly-lines from 2 different layers (Layer1 in Brown and Layer 2(postGIS layer) in Pink color- ), but my snap option don't work. I have changed the tolerance to different ...
3
votes
1answer
710 views

ArcGIS 10.1 Python script to snap points to lines

I have 2 Feature Datasets in a geodatabase. One dataset contains bus routes and the other contains bus stops for each route. I want to create a script that will snap the bus stops to the vertex of the ...
3
votes
1answer
618 views

QGIS snapping not working for me

I am new to QGIS, and this is a very basic question. I made a new polygon layer, to trace cadastral boundaries off a raster map. I want the polygon nodes on adjoining acreages to snap together. Some ...
3
votes
2answers
159 views

Snapping raster grids in R

I am trying to align two raster grids in R. Once aligned I would like to be able to add them together. I have tried to check whether making a stack would work: grid_snap <- stack(habi_sdw, ...
3
votes
1answer
147 views

Setting Up Snapping Environment Snapping Type

I try to setup snapping environment snapping type by referring to this source (http://resources.arcgis.com/en/help/arcobjects-net/conceptualhelp/index.html#//0001000001s1000000) but I can't combine ...
3
votes
1answer
695 views

Tracing Boundary Around a Polygon Shapefile in QGIS

I'm looking to create a boundary around this shapefile of street blocks to have show the city limits in QGIS. I tried this solution, (Settings > Snapping Options and enabling the "Avoid Int." ...
3
votes
1answer
754 views

ArcGIS 10.1 Network Analyst: Snapping stops from point-shapefile to route analysis layer doesn't work properly

I'm struggling with a task, which should be not that difficult....but anyway I do not find a solution. Background I'm map-matching tracks, generated by a GPS-device, to a road network. Therefore I ...
3
votes
4answers
65 views

Showing spatial coincidence using QGIS / PostGIS?

I have a database of fire hydrants (HYD). The positions aren't very exact, the other fields are very useful. I also have a database of GPS'd fire hydrants (GPS). We are manually moving the HYD points ...
3
votes
0answers
231 views

How to snap and move circles by the center?

I have a point layer, and a polygon layer with buffers of a given radius around each point. I need to move points, and check that each buffer is not above forbidden land/plots. In autocad, you can ...
2
votes
2answers
1k views

ArcGIS Trace tool not honoring classic snapping?

I have just installed service Pack 3 for ArcGIS 10 Desktop. Normally I use the new snapping environment, so I am unsure whether this is a new issue with SP3 or if it has been the case the whole time. ...
2
votes
1answer
2k views

Is there a function or tool that will add vertices to polylines where endpoints are snapped to edges? (ArcMap)

My friend and I are creating a walking network, and we have been having issues getting the routing to work. We just realized that the reason why our routes are messed up is because we snapped our ...
2
votes
4answers
204 views

How to set a minimum point snap distance?

There are two points: A and B. I need to snap any points within a 65 m search radius (blue buffer) of point A. However, the snap distance of B needs to be exactly 5m apart from A (i.e. located ...
2
votes
3answers
2k views

ArcGIS 10's Editor and Snapping toolbars question (snapping polyline to another polyline)

Have attempted this about 20 different ways using Editor / Snapping Toolbars and ET GeoWizards but still cannot find solution. Screen shot is attached. Need to snap the green polyline to the red ...
2
votes
1answer
19 views

Stop snapping from occuring with inserted text?

I'm having trouble with text and scale bars in layout mode on arcgis snapping. I want to move the text freely. It's not necessarily snapping to inserted margins either. I've tried guides and it won't ...
2
votes
1answer
85 views

Calculating midpoint for snapping using OpenLayers?

How to calculate midpoint of all lines in layers, and add to it layer for midpoint snapping, using OpenLayers 2.13? I've tried the following code, but does not work: var features=vectors.features; ...
2
votes
2answers
143 views

how to snap points to lines in QGIS/PostGIS?

I'm attempting to snap approximately 900 points to a line table. I've tried recreating what I have found from a couple of PostGIS answers but not having much luck. To test, I've created two ...
2
votes
1answer
44 views

snapping line nodes to points

I have a dataset of manholes and pipes; I want to snap the lines start and end nodes to the manholes if they are within a specified distance. Been trying to find away to do this using PostGIS or QGIS ...
2
votes
1answer
79 views

Temporarily suspend snapping in QGIS

Is it possible to temporarily suspend snapping with a shortcut Key in Qgis, like its possible holding down space in Arcmap?