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
votes
7answers
19k 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 ...
15
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 ...
14
votes
0answers
324 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
3answers
3k 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 ...
12
votes
1answer
401 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
777 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
8answers
8k 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 ...
8
votes
1answer
573 views

real time map matching

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 ...
7
votes
5answers
13k 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
4answers
3k 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
3answers
598 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. ...
6
votes
1answer
924 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 ...
6
votes
1answer
493 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
621 views

Is it impossible to measure Right of Way in ArcGIS?

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 ...
5
votes
1answer
5k 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 ...
5
votes
2answers
262 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
5k 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
4answers
270 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
146 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
295 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
83 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
689 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 ...
3
votes
1answer
184 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 ...
3
votes
3answers
360 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
143 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
53 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
494 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
0answers
66 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
1answer
1k 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
111 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
1k 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 ...
2
votes
2answers
1k views

ArcGIS10 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
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
218 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 ...
2
votes
1answer
43 views

Extract a polyline f rom a geoserver shapefile

I've been Googling my question for 3-4 hours now but I couldn't come up with an answer. I have a GeoServer which contains a shapefile with some roads on it. Is it possible to programmatically query ...
2
votes
1answer
466 views

Why does new feature created not snap to existing feature vertices in ArcGIS 10?

I have created a polygon feature earlier then I wanted to create points on the polygon vertices but it won't snap on top of the vertex. I wanted to know the reason why it does not snap and is there ...
2
votes
1answer
237 views

ArcGIS 10 (SP 3) - Geometric Network - which features are moved?

In ArcGIS 9.3 Geometric Network, you can select which features can be moved when snapping. In ArcGIS 10 (SP 3) this functionality has disappeared and you either choose to have snap tolerance or not. ...
2
votes
1answer
643 views

Snapping lines to points

I have a layer containing a vector 'Line 1', that originates at point 'A' on a second layer. I also have point 'B' on a third layer. I want to create 'Line 2' that has the same angle and length of ...
2
votes
0answers
216 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 ...
2
votes
0answers
24 views

automatic snap line to line [duplicate]

I need to automaticly overlay/snap the red line (gps-track) exact on the lines of my roads-shape. Is that possible?
2
votes
1answer
309 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." ...
2
votes
0answers
279 views

Get Feature that was snapped to in New Snapping Environment

I asked this over at the ESRI forums but lack of activity over there made me post here as well. Does anyone know if there is a way to get the feature that something was just snapped to in the ...
1
vote
2answers
102 views

How to activate snapping for layer you are drawing polygons in?

I want to draw multiple polygons in a layer that have boundaries without a gap, so I activated snapping for that layer. But it doesn't work. For other layers it works fine.
1
vote
1answer
176 views

QGIS - WGS84 to BC Albers reprojection no curved lines, any idea why? How to snap a line to a point?

I am trying to learn a bit about QGIS. So I thought I would drop in some layers of my Province and then recreate some points representing the BC Albers Central Meridian, and the two standard ...
1
vote
1answer
75 views

Snapping with polgon drawing

I am drawing a polygon with the drawing function within ArcGIS 10.1. Is there a way to snap orthographically at 90 degrees while using the polygon draw command. I added a picture of what i would ...
1
vote
1answer
362 views

How to change the color of red edit-polygon or purple snap-confirmation?

I'm having trouble seeing the purple or pink snapping confirmation when drawing a polygon because the temporary polygon is red (QGIS 2.0.1). Also the vertices in edit mode are also red. I looked ...
1
vote
1answer
398 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 ...
1
vote
2answers
802 views

ArcMap 10.1 point snap: Unable to snap to a point please help!

Very basic question sorry, missing some fundamentals. Outline: I have 4 points as a .shp also converted to .lyr that I brought in as a x/y table and converted. I want to create a polygon as a ...
1
vote
1answer
50 views

How to transpose data points to a line efficiently?

See sketch below. The main objective, using ArcGIS 10 or 10.1, is to get the P points to the perpendicular P line and, either the closest B point to the endpoint of the P line where it interesects ...
1
vote
1answer
78 views

ArgGis seems to snap but doesn't

We are building a project in ArgGis 10.2 were we create buildings using rectangles. Some of them need to be attached at one or more sides (they have common walls), so we would use snapping to snap ...