A set of ordered co-ordinates that represent the shape of geographic features too narrow to be displayed as an area at the given scale (contours, street centrelines, or streams), or linear features with no area (county boundary lines)

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0answers
11 views

OpenLayers - Add points at vertices of line while drawing line

I would like to create points while I draw a line on my map in OpenLayers. That is, at each vertices of a line and at the end points there is a shape like a square, circle, or diamond. I have this ...
1
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0answers
36 views

Splitting lines once at specified distance from each end?

This is related to an old problem of mine, regarding arrowheads on lines, which doesn't look very nice unless the line is very thin. It's even an ArcGIS idea with quite a lot of votes (although no ...
4
votes
1answer
97 views

What is an efficient Algorithm to draw a straight line from points?

I have some cross section survey data, which is like this: X Y Z pt_dt 2970969.635 359725.0088 83.4242 1-x 2970968.278 359722.2182 83.2591 1-x 2970941.771 359670.127 83.0655 1-x 2970961.369 ...
3
votes
1answer
895 views

How does Flow Mapper Plugin work?

I downloaded the Flowmapper plugin for Qgis and I can't seem to find any information on how it is supposed to work... Also the text seems to cut-off and not fully showing for the input fields so I'm ...
2
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2answers
55 views

How to create a line output from a buffer instead of a polygon?

I am looking to create a graduated line buffer like in the image attached. I was wondering if there was a direct tool to do this? I can do it in a few steps, but that may take too long. I also ...
1
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1answer
97 views

QGIS: Clipping a line layer using a polygon and getting an empty shapefile

I am using QGIS 2.2.0 and want to clip a line layer (roads) so that only those inside a polygon are shown. When I do this using Vector->Geoprocessing Tools->Clip I only get an empty shapefile as an ...
0
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1answer
160 views

Update Point ID as Start Node and End Node to Line through FME

I need your help to perform the below process in FME. I have two layers: Pole Data (Point) and Cable (Line). Cable has no ID. I want to keep the Cable which is going through the Pole. Then make the ...
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0answers
24 views

“construct points” troubleshooting

Apologies for the potential simplicity of this problem but I just cant find a solution! I need to create a series of points along a line at a specific interval. I am using ArcMap 10.2.1 and the ...
1
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1answer
168 views

Split a line feature using nearby points

I have a line shapefile and a point shapefile, and the line has its own segments and its attribute table, the point shapefile has points near the line above, not on it and the close ...
3
votes
1answer
166 views

digitizing (tolerence) error in line data

I have designed a large number of boundaries. For accuracy, I took lines in patches from different data sets and merged them into one. Now I want to turn them into polygons from lines. I every second ...
0
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1answer
121 views

How to set the length of a line using openlayers

I'm trying edit a polygon by changing the length of some lines by code. Found this method to calculate based on the bearing. But I didn't find anything on how to calculate the bearing, before I start ...
3
votes
2answers
132 views

How to automatically draw lines with a given angle from one single point in qgis 1.8?

I'm new to qgis so please be patient. I need to draw a bundle of lines all originating from the same point and with a 10° angle between each line (e.g. lines bearing at 0,10,20 ..90..110..220..350). I ...
2
votes
1answer
90 views

Using ST_split to split a line feature using nearby points

I have a line shapefile and a point shapefile, and the line has just one segment and its attribute table, the point shapefile has points near the line above, not on it and the close ...
0
votes
1answer
169 views

Updating a column with line direction in MapInfo

I was wondering if there is a way to update a column in MapInfo with the digitised line direction. I have two TAB files, one is complete lines and the other is sections of the same lines (both have a ...
1
vote
1answer
25 views

How to add dashed line in QGIS print composer

I want to display two maps in the print composer: a main one, and another showing a zoomed in section of the main map. I've drawn a rectangle over the original region and want to add two dashed lines ...
3
votes
2answers
76 views

Checking "connectedness'' of line shapefile in ArcMap

I inherited a line shapefile in ArcMap that is used to represent a road network. The problem is that the road network is pretty large and it is impossible for me to: a. Tell if the end of each line ...
1
vote
1answer
88 views

QGIS how to compute a trendline of two point lines?

Does anyone know how to compute a trendline for two lines of points? I have two lines of points of a 10 km long urban road. 1st line is one driving direction and the 2nd line of points ist the other ...
1
vote
1answer
42 views

Generalize lines with specific points

It's been a while since I was here. I have this problem now. I have electricity line feature class and point feature class intersecting line features. What I need to do is simplify this line feature ...
0
votes
1answer
49 views

Split a line from point but with a certain distance [duplicate]

I am using ArcGIS 10.2. I need some suggestion about this problem, maybe there is a certain tool, but I think no. I think some python code... but I do not know from where to start :( I have two ...
1
vote
2answers
34 views

Split polygon based on line segment

I am trying to split a street polygon based on the segment ID of the street, giving them the same segment_ID in the attribute table of the street lines. I did not use the line feature class to derive ...
3
votes
2answers
25 views

QGIS Line End Caps

When styling a road network where all sections of the network between junctions are separate paths, I style the ends of the lines to rounded to remove any gaps that might appear where the joins are at ...
2
votes
1answer
29 views

How to subtract lines with thickness from polygon

I have a polygon and some lines crossing it. I want to subtract the lines with a certain "thickness" from the polygon, so it splits up into various polygons which do not touch each other anymore. You ...
7
votes
3answers
1k views

Elevation profile 10 km each side of a line

How can I get an elevation profile for a band of terrain? The highest elevation within 10 km (on each side of the defined line) should be taken into account. I hope my question is clear. Thank you ...
2
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0answers
32 views

In ArcMap, when using Add Surface Information, why are all avg_slope values positive?

I've got a polyline shapefile and a LIDAR elevation dataset. I've successfully used Add Surface Information (from 3D Analyst) to calculate the average slope (avg_slope) of each line segment. The ...
0
votes
1answer
46 views

Cut polygon shapefile by line shapefile

I have two shapefiles, a polygon shapefile (lake) and a line shapefile (boudary) I want to create a new shapefile "polygon to the north of the boundary" What tool can I use in QGIS or other free ...
2
votes
0answers
68 views

Shortest distance from polygon centroids to a line in QGIS

To get the distance of each polygon centroid from a line, I have tried the Distance to nearest hub algorithm from the Processing Toolbox. The distances I got from the algorithm did not seem correct, ...
8
votes
2answers
808 views

Creating a line (closest vertex to line)

I am working in reorganising our utility data. Two years ago, we have started collecting Private Service water line. We still have a lot of them to extract from old Record Drawings. I was ...
0
votes
0answers
31 views

ArcMap line shifted after export

I am working on a map with road layer. I have a dashed line as a symbol for planned highways. It is OK in the ArcMap but after the export to pdf, one of the lines is shifted. Strangely it is happening ...
1
vote
1answer
499 views

Draw lines and Move the marker at the same time with KML format

it is possible to draw a line and put the Marker in the top of the line with KML format? or have i to make two KML files, it's that to say, One KML file for the Lines and another one for The Markers? ...
0
votes
0answers
38 views

Drawing Line on existant Shapefile in Geotools

I have a shapefile that is opened and looks as such: Now I am attempting to draw a line from two points I click on that map; however the code they give for the QuickStart.java example is ...
0
votes
1answer
147 views

Creating distributive flow line map showing movement of passengers from bus terminal to several destinations?

I'm writing my final year B.Sc thesis on transportation (pattern of passenger flow from a bus terminal to several destinations). I intend using a distributive flow line method of spatial movement ...
0
votes
1answer
62 views

Dashed lines do not print correct

I have a polygon with a dashed linetype; when viewed in ArcMap the linetype appears correct however when I print to pdf the linetype does not look correct. This might be a pdf quality problem however ...
0
votes
0answers
27 views

Use python to execute GRASS module v.distance

I have successfully use python script to import a line shapefile and a point shapefile into GRASS, and the following are their attribute table in QGIS, line shapefile point shapefile Now I want ...
0
votes
0answers
31 views

How to displace overlapping features in OpenLayers?

I have two line layers representing a different bus routes. The bus routes sometimes run through the same street. In these cases, the line layers overlap and only the upmost layer in the stack is ...
0
votes
1answer
68 views

How to compute and fill One-way field in a street shapefile according spacial position

I think it is something complicate, but I hope someone could bring up any idea about. I'm using ArcGIS10, and I have a "One-way roads" shapefile with a One-way field with Y/N. But I need to create a ...
2
votes
1answer
36 views

How to do the overlap detect for buffered lines

We have almost 50000+ lines which we want to remove a line if it is too close to the other. So we tried to do a buffer for two line, then check if the buffer area are overlapped. I wonder if there ...
2
votes
1answer
142 views

How to style the end of a line?

In the picture you can see, the red lines i added manually. These are the ends of the lines. To distinguish that there is the beginning of a new river segment, i would like to have something like ...
0
votes
1answer
71 views

Snapping line segments together to remove gaps between them

I have a series of line segments that were created based on the location of an existing line. There are small gaps of around 0.1 feet between the different line segments. I need to somehow snap the ...
0
votes
0answers
13 views

Mapserver dynamically line

I'm a beginner for GIS especially for Web GIS that's implementation to mapsever. I created a project that I've uploaded at dedyfuadi.web.id . For the map features, I made by QGIS 2.0 and for ...
0
votes
0answers
16 views

Shorten multiline in QGIS

I have a multiline dataset in a spatialite database. How to shorten that multiline based on a specified distance or percentage in QGIS?
0
votes
1answer
36 views

Switch line direction for PostGIS-lines in QGIS or Pgadmin

I am trying to switch the line direction in a PostGIS-layer. The postgis-geometry column is e.g. "LINESTRING(0 0, 1 1, 2 1, 2 2)". The reason is that my symbology is direction-dependent, but I drew ...
0
votes
1answer
26 views

How to create segments/lines by inputting coordinates

I have a set of coordinates and I wisht to recreate them in GIS. Basically, I am following from a paper based sketch map of maritime delimitation.
1
vote
0answers
47 views

Method for identifying upstream segments

I need to add to the attribute table of a stream network layer a column that can identify all upstream segments that contribute to the segment (for each segment). My best idea at the moment is to ...
1
vote
0answers
121 views

Splitting polyline by points using ArcGIS 10.2 for Desktop?

I have a layer containing a curved polyline and I would like to split it at multiple point locations, which I have in another layer. In ArcGIS 10.2, I can do this with the tool "Split Line at Point". ...
3
votes
1answer
1k views

How do I find vector line bearing in QGIS or GRASS?

How can one extract the bearings from a set of lines in a vector file? I'm trying to find the bearings of several straight vector line segments (simplified contour lines, actually) and can't figure ...
0
votes
2answers
149 views

How to find when train nears station? [closed]

I am creating an app for tracking trains. When the train comes near to a railway station the system should identify it. To do that I want to gather GPS coordinates near the station and save them. ...
1
vote
2answers
215 views

Openlayers: Get Start and End Points of Line Vector Features

I'm trying hard to get start and end of lines from a vector. The line vector is loaded from a kml-file. For now, I tried to iterate over features in the vector and grab the start point and put it in a ...
11
votes
2answers
475 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 ...
0
votes
0answers
27 views

Creating separate Polylines from Points using ModelBuilder and Python Script Tool? [duplicate]

I have a list of coordinate points (long and lat) of 4 locations (points 0, 1, 2, 3) saved as a feature class shapefile. I want to create a polyline that will connect points 0 and 3 and create a ...
1
vote
1answer
56 views

How to make river lines intact between confluences in QGIS?

I got a river shapefile below, and I found that there are many fragmental lines in this line shapefile, like, and, Most of these are located around the confluence(node), and how can I do to ...