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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4
votes
3answers
448 views

How to join number of point features into attribute of nearest line segment

I have point shapefile with lot of attributes, that represent road accidents and line shapefile with highways. What i want is to join attribute into line shapefile with value, that represent number of ...
3
votes
1answer
1k views

Spatial Join problems in ArcGIS 10.1 - intersect polygon and lines

I have hurricane tracks (Lines) and Florida county boundary (polygon) and I want to extract only those hurricane tracks that intersect Florida. In ArcMap 10.0 I used Spatial Join (from ...
1
vote
0answers
202 views

Lines as Great circles on a map

How can I get line features to appear as great circles on a map, instead of straight lines? Thanks,
1
vote
0answers
130 views

Splitting a branched river network at point layer

I need to split a country-scale river network (polyine) at certain barriers (point) so the length of (branched) river sections that have a certain minimum length. I used the following procedure: 1) ...
4
votes
1answer
197 views

How change border line to no pen with python console?

From Python console I load a shapefile with qgis.utils.iface.addVectorLayer. How I can remove border lines (change to no pen) in the active layer?
3
votes
3answers
615 views

Breaking a dynamic text line in data driven pages

I am using data driven pages and some of my dynamic text attributes are too long for my layout. Is there a way to break the line into 2 or more lines with out editing the data? Example: FROM Billy ...
2
votes
2answers
260 views

Selecting lines occupying identical positions in MapInfo or QGIS

I have two shapefiles from a client, one is their entire network (complete with unique IDs) and another a selection I need. However the selection file does not have unique IDs but the entire one does. ...
4
votes
2answers
215 views

Draw two separate lines from A to B and B to A

I have an Origin-Destination table like this Origin Destination Value A B 10 B A 100 A C 120 ... For all the locations A, B, C... I have another table indicating their location (Lat and Lon) Is ...
2
votes
1answer
176 views

Sum line length with clip intersect? [closed]

SELECT sum(st_length(st_intersection(POLY.geom, LINE.geom))) AS sum_line_length... Is this function OK to calculate the sum of lines length? Wonder if it do the clip line where one line go from one ...
2
votes
1answer
2k views

How do i calculate line segment lengths within a polygon?

I have a layer with line segments and a layer of polygons (in this case, buffers around points). I need to create a new field for each polygon that contains the total length of all line segments ...
13
votes
2answers
811 views

How can I merge/collapse nearby and parallel road lines (eg. a dual-carriageway) into one single line?

I have a shapefile from OSM which contains all the roads within a city. Larger roads (like dual-carriageways) seem to have 2 parallel lines. I'd like to collapse / combine those into 1 line so I can ...
7
votes
2answers
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 ...
0
votes
0answers
221 views

CAD Contour Lines to ArcGIS Attributed Polylines

I'm having a 'CAD to GIS' issue. I have a dwg file which contains large number of contour lines that have been split by labels. I need to import the contour lines from CAD to GIS so that they contain ...
6
votes
2answers
457 views

How to create line with exact same length over and over again?

I need to draw 30 meter lines in specific places. Ctrl+l is too annoying to do everytime. Is there a easy way to define specific same length for a line that I need to draw many times?
6
votes
1answer
342 views

QGIS line style

I found the latest QGIS has a great tool to create complex styles, however looks like one small but very useful thing is missing, or I can't find it. I'm trying to create a line style something like ...
1
vote
0answers
271 views

Creating points along lines? [duplicate]

Possible Duplicate: How to create a point along a line given distance How to create equidistant points in QGIS? I have some road survey data and each line has an individual value and ...
3
votes
1answer
154 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 ...
6
votes
0answers
227 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 ...
2
votes
0answers
58 views

Strange line appearing

I have this line in my project's layer which i cant make disappear: I hope you can see it. In QGIS is much more visible. An it also appears on the print composer. Any suggestions would be very ...
3
votes
0answers
108 views

Why doesn't Polygonizer copy the line ids to my polygonized shapefile?

I am trying to convert a line shapefile into a polygon shapefile using Polygonizer plugin, and when my new polygons are created all the cells in my id field are "Null", although I have clicked "copy ...
4
votes
1answer
215 views

How to extract most probable flow line from multiple lines?

I have to apply uncertainty principle to computing flow accumulation using Monte Carlo method. I generate raster with random numbers which represents mistakes in creating DEM. Then I apply those ...
3
votes
1answer
206 views

How to create a line with start and end points which are in another layer in QGIS?

In my map, there are lots of points in layer A. I want to make a line layer B and I want to make start & end points of lines snapping to points in layer A manually. Can I use points of layer A as ...
3
votes
1answer
255 views

How to connect particular sets of points with (poly)lines?

I think my problem is quite easy to be solved by the most postgis-users, but i am a bloody beginner: i have a timestamped point-table representing GPS-tracked places of different cars. To distinguish ...
1
vote
1answer
363 views

CssParameter stroke-width min max value Geoserver

I wonder if there is a minimum value for the stroke width parameter since I've a LineSymbolizer with stroke 0.1 but i want it to be thinner so i change the value to 0.05 but i dont see any difference ...
6
votes
1answer
496 views

How to connect places (points) without crossing lines?

I have two sets of data. One with placemarks represented by blue dots in image below, and another set of geographic data with lines represented by grey lines. 1) For the first point in drawing, I'm ...
3
votes
2answers
2k views

Compute Angle of a line in conventional bearing

I am trying to compute angle between two lines (line segment) using ESRI (ArcGIS, JS) in conventional bearing (Eg: N29'E) I am using Add Toolbar to draw a line segment where point A is a fixed point ...
6
votes
2answers
1k views

How can several vector layers have different controls, using Openlayers?

Using openlayers I have two vector layers. One layer is called lineLayer consisting of vector lines, and the other is called pointLayer consisting of points. When I hover on the lines I want to be ...
2
votes
2answers
264 views

Joining lines in MapInfo that won't be split by disaggregate?

I have just run a disaggregation a .tab containing just lines and found I have a few with duplicate IDs. However when I zoom in these lines appear to be connected. Is there any way to join these ...
4
votes
2answers
2k views

How to Partition Line into Segments using ArcGIS for Desktop?

I have a shapefile of U.S. states. I extracted the boundary between two states, resulting in a line segment. For example, the boundary between Georgia and North Carolina. Is there a way to further ...
1
vote
1answer
1k views

Drawing a Straight Line Between Two Polygons on a Map and Listing Which Polygons It Passes Through

I have a shapefile of United States counties. I have two counties that I would like to highlight. I would like to draw a straight line distance between them. By straight line, I mean, if you were ...
5
votes
2answers
168 views

Grouping lines together to form one line after a distance threshold is met: ArcGIS 10

I have lines on a map showing the most direct way from point data to the coastline (polygon). I would like to group the lines if they are close to each other by a distance that I can set. Where the ...
5
votes
4answers
262 views

How to avoid holes in polygons from lines?

I am trying to convert a dataset of lines that contains the coast of New Zealand into a big polygon. However using the vector -> geometry tools -> lines to polygon command in Quantum GIS results in a ...
3
votes
3answers
847 views

Finding centrelines from polygons?

I was wondering if there is a way to create centre lines from polygons in QGIS? I have a polygon layer, but ideally need the centrelines as a separate file. Thanks, Alan
1
vote
4answers
433 views

How to find the center point of MULTILINESTRING?

How to find the center point of MULTILINESTRING, which lies on the multiline?
2
votes
1answer
71 views

I made a Relationship Class(1-M). Its a street X our Address table. I can´t split the street. How to fix it?

I have a table "Addresses" and the Feature "streets". The feature "Streets" are lines. I need to do a relation with this table with this feature. What I do? I tried built a "relationship class". The ...
5
votes
1answer
173 views

Given 2 LINESTRINGs with common point, how to extract common point?

I have 2 LINESTRING geometries. I know both share a common point. Using PostGIS for Postgres, what is the cleanest way to extract the common point? Example with illustration: How do I extract the ...
0
votes
1answer
231 views

Change line selection display in MapInfo

can someone help me with a MapInfo query. Is it possible to change the display MapInfo uses when selecting lines? Atm I can be often difficult to see selected lines easily as the lines I am using are ...
2
votes
1answer
190 views

Connect points along bathymetry contours

I have a table with start and end point data in each row and need to convert them into lines, but I would like something other than a straight segment. Ideally, I want to connect the points via a ...
4
votes
2answers
459 views

How to find isolated geometry/attributes in road network?

I have a road network with paved/unpaved status in attribute table. This road network don't must contain isolated paved geometry. There are any solutions find isolated geometry in GIS software ...
7
votes
2answers
227 views

How to connnect two lines with different width so it looks good?

Simple question, how do you create a symbol with or without representation to connect two lines with different line width so it looks good? I need to have a smooth transition between the lines, ...
1
vote
3answers
484 views

Divide Line Into Sections Using Points Offset from It

I have track (line) and milemarkers (point). Each point is offset by a different distance. Is there a way to find where each point would intersect the line if going perpeniduclarly out from the line? ...
2
votes
1answer
226 views

merging TIGER Line shp files for better labeling in ArcGIS

When working with TIGER line shp data at county level scale the labeling of roads, rivers, railroads, etc. is cumbersome due to all of the tiny line segments. Merging the dozens of segments that ...
1
vote
3answers
3k views

Show pop-up where user clicked in OpenLayers

How to change this example ( http://openlayers.org/dev/examples/select-feature-openpopup.html ) so that when the user clicks on a line (feature) pop-up display where the user clicked? A few days ...
4
votes
1answer
140 views

How best to map lines based on multiple attributes?

I need to plot lines onto a map to display road quality. I'm already using colours to distinguish between different road conditions, but I also need to display another factor - the survey origin. ...
2
votes
1answer
900 views

Basic User Questions: Tracing a Border in QGIS

The project: I'm plotting a dilapidated cemetery, I'm using GPS waypoint data to plot the headstones in QGIS. The map I'm making is to show the orientation of the graves, and who is in them. I ...
1
vote
1answer
556 views

Splitting lines at a specified distance

Does exist some plugin with it is possible to Splitting lines at a specified distance in Qgis?
6
votes
1answer
457 views

Filling a polygon with lines using Postgis

i need to calculate a specific distance in an area. The distance is calculated from parallel lines in a polygon, And i need to find out how many parallel lines (with x meters distance to each other) ...
3
votes
3answers
388 views

Selecting polygons with a minimum internal straight line value - ArcGIS 10

I have a map of polygons representing forest stands. I am trying to sort through them to find those polygons that have a minimum internal distance of 200 m in a straight line (my field sampling will ...
2
votes
1answer
329 views

How to move a Point perpendicular from nearest Line?

I want to move Point perpendicular from nearest line or polygon, and the question is how to do that? example, I have points (house number) near roadbed, and I don't want them to intersect roadbed ...
3
votes
2answers
339 views

Housenumber(point) angle from line (street)

using arcgis 10 with Point data (Housenumber without angle attribute) and line data (street without angle attribute) I want to create housenumber labels from point with correct angle from nearest ...