Used for questions about making polyline features

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2
votes
1answer
197 views

Creating a line along an existing polyline from a point

I have a large data set of points, all of which lie on a river network and have x, y co-ordinates. I want to calculate the slope of the river channel at each point from the underlying DEM by taking ...
0
votes
1answer
52 views

Failing to get wkt to reference for a multiline

I apologize, I'm quite new to WKT (and most everything else). I have a shape that I've exported to csv. & geoJson to be loaded into CartoDB. Unfortunately, the geoJson doesn't work so I am trying ...
2
votes
0answers
139 views

How to create multiple polyline transects with a certain orientation?

I am attempting to create multiple polyline transects and use them as cross-section profiles to analyze snow drifts on a landscape. Is there a method of creating multiple transects in such a way that ...
1
vote
0answers
163 views

QGIS - Polygon to Lines Tool Incredibly Slow

I am trying to convert a few polygons to polylines so I can save them as a .GPX file. I'm using QGIS 2.8.1 (Wein) on the Mac. It seems to be hanging. I only have a few small polygons (see screenshot)...
1
vote
0answers
93 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 ...
0
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0answers
20 views

Segment polyline at distance from points

I have polylines with many vertices (i.e., a river). For analytical purposes, I want to segment this line at specific distances from points that occur along these polylines. Normally with straight ...
0
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0answers
32 views

Can you create a shapefile from values from another shape file's attribute table?

I have imported a mask file into GIS, so that there is a grid created (using the Create Fishnet function), which displays values as either inside (land) or outside the shape (land) that I wish to map. ...
0
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0answers
115 views

Drawing road network from scratch in ArcGIS for Desktop that connects centroids?

I have map that has 14 zones. I have attached the map. Each zone has a centroid as shown in the map. However I do no have a road netowrk associated with the map. What I would like to do is draw a ...
0
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0answers
158 views

How to create a polyline using multiple points using a PostgreSQL query?

I'm trying to use point data to create a polyline to show my bus route. Initially began with coordinates and used this to create geom using the ST_MakePoint function (written to the BusRouteData table)...
0
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0answers
78 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 ...