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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1answer
46 views

Split lines by polygons in QGIS 2.4

I have a river network (lines) and a shp with states (polygon). I would like to split the lines at the state boundaries --> split lines by polygon boundaries. Is there a geoprocessing tool to do ...
3
votes
2answers
36 views

road density km/km2 calculation

I am trying to calculate the road density in my study landscape. I am using the spatial analyst, and the line density function. By default, the tool is setting a cell size of 3.6km*3.6km, and the ...
-1
votes
0answers
19 views

Merging point and line features together into one [closed]

I wanted to know can you merge different data types (e.g. line & point) together? If so how since the Merge tool doesn't allow for this.
4
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0answers
49 views

Search Radius for Line Density

I have been working with GIS for many years but I am fairly new to the spatial analyst side of things. I am working with many satellite tracks for many different individual animals and would like to ...
2
votes
0answers
26 views

How do I accurately measure a gps track over a long distance?

I am measuring the length of the Continental Divide Trail that goes from the Mexican border to the Canadian border. I have a .gpx file of the entire route in NAD83 with tracks about every 50 meters. ...
1
vote
0answers
22 views

How to delete lines that do not overlap a polygon? [duplicate]

I'am new to QGIS and I run into a problem. I have two shapefiles, one with line data and one with polygon data. I would like to remove all the lines that do not overlap the polygon. So remove all ...
1
vote
1answer
36 views

Problem Merging two line segments

I am using ArcMap 10.2 and merging several line segments with the same ID. Most of the time this works fine and I end up with one segment. (about 95% of the time) However, occasionally the segments ...
1
vote
1answer
37 views

Draw line overlays and center map

(Apologies if this is a trivial question; I'm completely new to the GIS world.) I have a dataset with start and end points of lines. Columns in the table are unique_line_id, line_start_point_lat, ...
2
votes
0answers
47 views

Create “mean” line from multiple lines using QGIS

I have multiple lines features (also have them in multipoints...) representing similar path (mountain trails, in this case) with various GPS precision, resulting in many lines close to each other, but ...
4
votes
1answer
71 views

How to connect centroids of lines sharing the same intersection in QGIS?

I'm looking for a big help to accomplish the following task: I have this street network of the center of Turin (IT), composed by lines representing streets, and black points representing ...
0
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0answers
22 views

How can I draw a Line on a Shapefile?

I have a problem, in Java I can draw points on my Shapefile, but I don´t know how to draw a Line. I found the SimpleLineSymbol, but don´t know how to use it further. My first try was LineString ...
1
vote
1answer
19 views

How to smooth lines in MapServer 5.6.8?

I have a map of property lines in MapServer and the lines look rough and have jagged edges and I wonder if there is anyway to make the lines appear smoother and more rounded in Mapserver 5.6.8? The ...
2
votes
2answers
56 views

Line Layer from Point to Point CSV file using QGIS?

My question is probably a basic QGIS question but I could not find something that would work for me. I have a file of the following format: where each from/to is a point that is already inserted ...
3
votes
1answer
54 views

Select duplicate attributes in same shape file in QGIS

I have this vector layer of lines between 2 nodes. I need to select all second entries that have the same length of the previous one. Can someone help me with this?
2
votes
1answer
26 views

Generating Multiple Lines from point feature to closest point features

I am doing a transportation analysis on buildings in ArcGIS 10.2. I need to find nearest point features to multiple feature classes and then generate lines to those closest point features. I was ...
2
votes
2answers
72 views

Flow Mapper wrong line length calculation

I'm finding some trouble with the length calculation in the Flow Mapper plugin. As you can see in the picture below the length of the 2 lines C001-C021 = 4233.7986... C001-C009 = 6069.3053... is ...
2
votes
2answers
58 views

QGIS 2.4.0 marker line interval does not work properly when line is bending

I am trying to style a line using marker line option. When I am using styling the line in the style window everything looks nice as you can see on the print screen bellow. I am using three line ...
1
vote
1answer
50 views

QGIS PointConnector Plugin - x out of x lines not drawn

Unfortunately every try to generate lines between points (.shp) with ids (1-6) and a csv-file with from - to values failed. Maybe you can give me a hint whats wrong with my workflow? 1) I generated a ...
3
votes
1answer
95 views

Automated removal of dangles / loose ends in line with QGIS?

Here's what I want to do: The original line is a dissolved osm extract of ways, which I want to simplify to one continous line without dangles / loose ends (red x's in picture). I found the ...
1
vote
1answer
17 views

Close linestring to linering in PostGis

is there a function which closes a linestring to a linering? I couldn't found such a function in the documentation. Thanks.
2
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0answers
26 views

How can I calculate the intersection of a line and the geoid (EGM96)? [closed]

I have a known line (point and vector) described in ECEF (Earth-Centered, Earth-Fixed) coordinates and I need to find where it intersects the geoid (Earth Gravitational Model 1996). Is there existing ...
0
votes
0answers
12 views

Creating observation points(vertices) around a line feature in ArcGIS 10.1 [duplicate]

Is there any way to create observation points(vertices) or lets just say points on a line feature. What I have is a line feature and I wanna put observation points around that feature, each one with a ...
1
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0answers
25 views

How to get attributes from line-polygon where points are snapped on, into the point-layer?

I have a SQL Server spatial table with point-objects, the points are set by snapping onto a line SQL Server spatial table. so the points are georeferenced on the line. How can I get the attributes ...
4
votes
1answer
96 views

How to split a line into a specific number of parts?

I've seen a lot of questions involving splitting a line with the help of a point layer. I want to split a line in fractions of its length. For example, I have a line 400 meters long, I want to split ...
0
votes
1answer
64 views

SLD specification for a vertical line on every line turning point

You can define a vertical line in SLD like this: <LineSymbolizer> <Stroke> <GraphicStroke> <Graphic> <Mark> ...
1
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0answers
88 views

OpenLayers, symbol every 100 pixel on line symbolizer

First: the above banner links this to How to use a sld file with Openlayers using OSM data? , but look update2. I would like to add rail-road hatching to my OpenLayers map with a Symbolizer. Example ...
4
votes
1answer
97 views

Horizontal only line thickness in ArcGIS

Is there a way so line thickness only expands horizontally from the centreline? I am making a road condition map and found it may not be truly representable. The red on the left overlaps the yellow ...
2
votes
1answer
78 views

PostGIS - How do I create a line that directly connects two earth points without travelling over a geodesic?

In PostGIS 2.1.1, I've noticed that if I create two distant earth points with equal altitude and then create a line connecting them, as I gather interpolated Z coordinate data along the line my Z ...
1
vote
1answer
63 views

Extracting raster values with polylines in QGIS

I have a polyline shapefile that represent a road an a raster grid with slope values. Is it possible to interpolate the shape file and the grid to have the average slope of the road? I know that I can ...
2
votes
1answer
127 views

Clipping Line shapefiles within extent of Polygon shape?

My question is an extension of Vertical lines in a polygon shapefile. Kindly refer to that question first. What you shall see there is a method of generating vertical lines with respect to the ...
3
votes
2answers
70 views

Analysis of lines in a point in QGIS

I have 33 layers, 1 with points and 32 with lines. I want to extract/highlight the points where more than one line is intersecting. I have tried with buffers but I'm not getting anywhere.
1
vote
2answers
75 views

Export long lat from polyline as csv file in QGIS

I want to draw a line in QGIS and then, export the long-lat of each point into a Comma Separated Value (csv) file. I tried doing this by creating a new shapefile layer and then using the Add Feature ...
1
vote
1answer
45 views

Creating dual lines with one line in geoserver

Im trying to figure if it is possible to create a two lines from one line say for instance a road. One to create the out lines as an underlaying color while another line creates a top color but a ...
2
votes
1answer
75 views

directional line symbol ArcGIS vs ArcView 3

Is this possible in ArcGIS to have variable number of arrows on the line to show direction? This is an ArcGIS example, where I can have fixed (1,2,3,4,5...) number of arrows and it stays the same ...
1
vote
0answers
109 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
vote
0answers
59 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
163 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
votes
2answers
77 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
vote
0answers
44 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
vote
1answer
55 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 ...
4
votes
2answers
191 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
57 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
78 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
66 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
39 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
votes
2answers
66 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
0answers
97 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 ...
3
votes
1answer
657 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 ...
3
votes
1answer
173 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
35 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 ...