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
10 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
35 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 ...
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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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
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
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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
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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 ...
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 ...
3
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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
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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
45 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
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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, ...
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 ...
0
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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
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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
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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 ...
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
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 ...
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 ...
0
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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
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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
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0answers
15 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
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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
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0answers
120 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". ...
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
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2answers
214 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 ...
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
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 ...
1
vote
1answer
96 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 ...
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 ...
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
107 views

Draw lines from points in QGIS

(I found here similar questions but they all reffer to ESRI's programs, and I use QGIS) I have a point layer and need to draw a line passing through or in the vicinity of the points (up to 0.5m ...
0
votes
0answers
43 views

How to create a point representing a polyline?

How do I convert a line (usually 2 vertices but can be more) into a single point in QGIS? I did it a couple of years ago using a build-in tool in ArcGIS 8 or 9 I think but have no idea how to do it in ...
0
votes
0answers
17 views

Point in Linefeature build through specific topology rules

i want to build Lines from Point Features following different topology rules (that lines aren't like randomly build, but how i should be following the extent from other polygons for example.. when ...
0
votes
1answer
48 views

CartoDB simple process

I'm attempting to create a simple process with CartoDB, I have a layer with number of polygons, I want to to run a SQL with a multipoint line to report which polygons were intersected.
1
vote
2answers
86 views

How to number points along a line consecutively

I have a line and along this line I have different points which are max. 20m away from that line. Now I would like to number the points along the line, like shown in the grafic. Any suggestions how to ...
4
votes
2answers
90 views

Need to merge overlapping line segments

I'm working with fish distribution data, and have combined several 24k habitat maps into a single layer that I'll call "critical habitat" In merging multiple distributions into one dataset, there are ...
0
votes
1answer
34 views

How to do a search in a line to a specific point

I'm using QGIS 2.0.1 Dufour. I'm working with a shape file made by a single line that represents a road with 30km. In that line I want to attach pdf files containing information about some points in ...
1
vote
1answer
98 views

Line bearing for wind direction for plume of smoke QGIS

I'm trying to draw a line representing direction of a plume of smoke for an emergency planning scenario in QGIS. The line needs to be 5km in length and have a bearing of 85 degrees. The closest I have ...
5
votes
2answers
201 views

How to calculate the area between two line shapes?

I'm a newbie using QGIS (2.0). I'm trying to calculate the sidewalk area of a city. For that I have some shapes, extracted from Mricostation, with the topology (facades, fords, fences, etc.), but ...
0
votes
0answers
23 views

Show the paths but not roadsides and driveways in the line layer

I want to display paths in the woods but the paths are all in One (line) layer that contains all roadsides, pavements, drivvays, but also paths, tractor road and other relevant roads in, and up to the ...
2
votes
1answer
154 views

Fading symbology at edges

A general problem for me with digitized material is that it can be too precise. Sometimes I just need to show a line or surface without sharp borders. I don't regularly need to visualize the exact ...