Used for questions about making polyline features

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3answers
3k views

ArcEngine 10 Polyline with arrow

I was wondering if there is a way to draw a polyline but with an arrow head at the end point? Thanks all IPolyline line = new PolylineClass(); ...
14
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4answers
4k views

How to create one-sided buffers or parallel lines in PostGIS?

I'm looking for a way to create so-called one-sided buffers or parallel lines in PostGIS. Example: 1. buffer, 2. one-side, 3. both-sides I've found some discussion on the mailing list from 2009 and ...
0
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1answer
79 views

Georeferencing system of rivers using XY To Line tool? [duplicate]

I have a State Water Hydro layer from our GIS county office that does not have georeferenced attributes (It is sitting on top of a State Plane county basemap). Looking at the XY to Line tool I need ...
7
votes
1answer
2k views

Making radial flow map showing curved lines over short distances (20km) using ArcGIS for Desktop?

Esri have provided instructions on how to make a radial flow map but I think the curved lines will only be produced over a long distance, like half the globe. For short distances (20km) a geodetic ...
11
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5answers
8k views

How to create points in a specified distance along the line in QGIS?

I want to use QGIS creating points along the line, but in specified distance. I found two GRASS tools in SEXTANTE Toolbox: v.to.points v.segment I tried v.to.points, setting the maximum distance ...
1
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1answer
867 views

Polymaps + D3+ Polyline with different width and color

I am actually working on a project which involves polymaps and D3. I was wondering if you could help me on this. I have 4 locations and I would like to draw a polyline from one location to other 3 ...
3
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1answer
239 views

polygon from exterior points

How to convert points data to polygon, so as to form polygon from exterior point as shown above
1
vote
1answer
802 views

Creating new lines along specifically selected existing lines using QGIS?

I have tried to find a solution for this everywhere, with no result... My problem is that I want to be able to manually draw a line that automatically snaps to a line (creating an exact copy of the ...
8
votes
4answers
4k views

How to create arcs between two points in Python?

I've been working on an python script automating the visualization of live point data. I have a table with two coordinate pairs. I'd like to connect these two point with an arc of a circle or similar ...
11
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5answers
11k views

Convert XY points to a line?

Someone mistakenly saved a GPS track as waypoints and then sent them along to me in a .csv file. They want a line back (shapefile). What's the simplest method to convert this to a line? Available ...
0
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1answer
364 views

How to create coastline in Arcgis 10.2

I want to generate the shortest distance to coastlines from interested points worldwide. My question is given existing world map polygon file, what the standard way to create coastlines is. Thanks ...
1
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0answers
76 views

Need advice on creating polyline templates (polyline vs polyline ZM) for future network dataset

I am about to request large amounts of polylines from a variety of sources (municipalities). The idea is to collect bike path data and build a regional bike network (I work for the region ...
2
votes
4answers
1k views

How to take 2 points from One featureClass, create a line between those points, and add the line to a new featureClass (aka Shape File)?

I'm a total noob/beginner in ArcObjects. I'm coding in C#. I want to extract 2 points from a given featureClass, create a straight line between those 2 points, create a new feature class and add ...
1
vote
1answer
71 views

How to measure and mark a line or point as a template QGIS?

I'm digitizing some of our sewer assets and need to be able to measure distance and create points. So, for instance, I have a sewer main that is 65m long. I need to mark a point at the 32m mark, then ...
2
votes
2answers
725 views

How to create links between points and nearest vertex of polyline feature class?

I have a point feature class and for each point I want to find the nearest vertex on a polyline feature class. I then want to create a line between each point and it's nearest vertex on the other ...
7
votes
1answer
868 views

How to determine the longest line segment within a polygon that passes through its centroid?

A PhD student approached me recently asking how one would determine the longest straight line that passes through the centroid of a polygon, the output being a polyline rather than just a table of ...
0
votes
1answer
1k views

How to get polyline features from a raster file using ArcGIS 10.1?

I have a watershed accumulation file look like this: There are several white lines by visual, and I tried the raster to polyline tool and got this: Are there better ways to extract polyline ...
5
votes
2answers
301 views

Can someone clarify some details about freehand line tracing in QGIS?

I have read several tutorials and questions here on this site, but I have some lingering questions/doubts that I would like clarified. My project is tracing roadways from a 1926 map so that I can ...
0
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1answer
77 views

Line style width property not being applied in QGIS 2.0.1

I change the line width of my style and click apply, but the property does not seem to be applying to my line data.
12
votes
3answers
4k views

Leaflet: how to draw curved lines?

So, I'm trying to draw curved lines in my application which is based on a Leaflet map. As far as I know Leaflet does not support drawing curved lines at the moment, so my question is really more ...
5
votes
2answers
8k views

How to write a script that will automatically draw lines from one point to multiple destination points? (ArcMap 9.3)

I need to create lines from an airport to numerous destination locations. The destinations change often, so drawing them manually becomes tedious. I want to create a script that will draw them ...
12
votes
2answers
2k views

How can I make a polyline wrap around the world?

I am using leaflet maps to create a representation of a round-the-world challenge. I would like to add a polyline which heads east from tokyo and then appears west of south america on the map - but ...
1
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1answer
888 views

From a trajectory of GPS points to a multiline segment

Given a trajectory as a sequence of GPS points I would like to create a smooth linestring representing a path where a car drove. The data is stored in postgresql: the input trajectory in a table, ...
4
votes
2answers
510 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 ...
11
votes
5answers
7k views

How can I map a matrix of origins and destinations in QGIS?

I have a central point on a map, and I have other points in a separate layer (the location of a venue, and the origin cities of the venue visitors). Is there a plugin which would generate output ...
3
votes
1answer
287 views

How to represent Typhoon(s) wind speed using Quantum GIS / PostGIS?

I am not completly new to GIS (was taught ArcGIS at Uni) but I would still consider myself (especially compared to all these experts here) a newbie in QGIS or PostGIS. I want to display the ...
10
votes
4answers
14k views

How to make a one part polyline from a multipart polyline?

I have a polyline which is divided into multiparts and these parts are not well ordered so that the vertex's ID are not following the polyline's plotting. This polyline is a representing a bus line ...
0
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0answers
76 views

Congressional Redistricting

I have a project coming up where I need to create new congressional district looking at only total population data. I am planning on using the census tract level of data, but I am having some ...
0
votes
1answer
91 views

How to smooth XY Co-ordinates of linear feature?

I need to smooth xy co-ordinates. see the image: In this case, i need to remove 5,6,7,8 and 9th co-ordinates or need to make those co-ordinates as a straight line between 4th and 5th. is there any ...
8
votes
2answers
328 views

How to derive vehicle paths from timestamped location data?

I've got a bunch of location data for snow plows. There's a unique id for every plow, a timestamp, and x & y coordinates. Instead of knowing where hundreds street plows were at one minute ...
7
votes
3answers
1k views

How to create transects from polygon centroid?

I have mapped potential study sites using polygons. What I want to do is create 9 125m transects spaced 75m apart. The center point of the middle transect needs to be the centroid of the polygon. Do ...
5
votes
1answer
496 views

How to draw a line between two places with via-points?

I have prepared a GPS-tracking dataset, currently consisting of one table with stopping points and one table with the raw GPS-points. The first table contains a column for any stopping point showing ...
3
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1answer
1k views

How to create perpendicular line from point on one line to an intersection with the nearest polygon layer?

I am trying to create laterals from a layer of sewer mainlines and have yet to Google a thoroughly helpful answer. Hoping to find some help here. I have a layer of mainlines that have a direction ...
3
votes
1answer
208 views

Curve from a Douglas-Peucker line

When generating a line using the Douglas-Peucker Algorithm the resulting object is a line with steep angles, I would like to "smooth" that line and making it look less "squarish" using curves, like ...
1
vote
1answer
474 views

Why ignores Google Earth the gx:altitudeOffset in KML files?

I am currently writing software that creates 3D polylines and outputs these in KML format. According to the official documentation it is possible to define an altitude offset via gx:altitudeOffset to ...
3
votes
2answers
2k views

How to create a multipart polygon?

I have two polygons that consist of two separate polygons/lines in QGIS). How can I make this into a multipart polygon, which consists of 1 line in QGIS?
1
vote
1answer
357 views

Create lines from a Blob field in ArcMap/Catalog or FME (or any other way)

Is there some way to create lines from geometry stored in a Blob field? It's a SDE-database line feature class that has crashed in some way, but I can still get the raw data and the feature class ...
6
votes
2answers
961 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?
5
votes
2answers
2k views

How to create a shapefile consisting of 2 lines using Python OGR?

How would you create a shapefile consisting of 2 lines using Python OGR? First line is no problem, but how do you reuse MyLine and Feature objects to create the second line? Ultimately this will ...
3
votes
3answers
1k views

How to create svg line style in QGIS?

I need to draw an telephone or energy lines as is done on the polish-core map. Thelephone line was drown by the polyline. I tried the SVG symbols, when I have a lot of single-lines, for each I 'put' ...
3
votes
2answers
1k views

How to densify a polyline according to a specific length? [duplicate]

Possible Duplicate: Add vertices to lines I am using QGis 1.8.0 I would like to densify a polilyne according to a particular length of segment (ex. 200 m). I know it is possible with other ...
2
votes
1answer
1k 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 ...
3
votes
2answers
1k views

Generate non-overlapping shapes from a buffer

I have a collection of points, and I need to generate shapes around these points. Let's assume that these points are locations of offices and that the shapes are the 'area of responsibility' around ...
1
vote
0answers
335 views

Length in meters arcobjects [duplicate]

i have a an array of polylines in epsg:3857 projection, and i want to calculate length of each polyline. i am new to arcgis and arcobjects, i couldn't find the functions that i need. Should i use ...
4
votes
1answer
1k views

How to create an offset polyline in arcpy?

I am trying to create an offset polyline using arcpy, identical to the function in ArcObjects (constructoffset). After trying to access ArcObjects in arcpy, which I found difficult for those not ...
3
votes
2answers
842 views

esri google maps api - Create a single GPolyline from an array of features

I'm using the esri google maps extension api... I have a esri.arcgis.gmaps.FeatureSet() (of type esriPolyline) containing an array of features (esri.arcgis.gmaps.Feature()). Is there a simple way ...
1
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2answers
1k views

How to import matlab data into ArcMAP?

I'm creating regression lines using matlab from points having UTM geographic coordinates. I would like to import those regression lines into a map of the same area in ArcMAP. My question is what ...
2
votes
1answer
1k views

Conversion of raster features to polylines: skeletonization?

I would like to identify linear features, such as roads and rivers, on raster maps and convert them to a linear vector features (i.e. polylines). I typically use R as my primary GIS, and have posed ...
10
votes
4answers
3k views

Connecting line features and determining the length of the longest line

I have a line feature (see image) representing a river that I created using the Stream_to_Feature tool. The attribute table contains several records representing different lines - the problem is the ...
4
votes
1answer
634 views

Why is my polyline on the wrong bearing?

I am trying to overlay duplicate segments of polylines on a map via javascript. I am using latlon.js and geo.js from here The idea is that a user can input the distance they have travelled and when ...