A sequence of point coordinates referring to the line segments connecting them, as used to represent a one-dimensional feature or object.
1
vote
1answer
66 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, ...
1
vote
1answer
64 views
How to perform SIA or Bezier line smoothing in PostGIS?
Can anyone provide an example SQL for smoothing linestrings from postgis table using Bezier curves or Iterative Averaging (SIA) algorithm?
3
votes
0answers
68 views
PostGIS 2.0 st_geomfromgml using LineString fails with invalid GML representation
I am attempting to insert a geometry into a table using the st_geomfromgml function.
The GML is being sourced from a Geoserver WFS request.
The function call looks like this
...
3
votes
0answers
124 views
ArcGIS Kernel Density with polyline, search radius / bandwidth calculation
I'm conducting a density analysis of a series of polylines and I'm hung up on determining an appropriate search radius.
The default calculation performed by arcgis is to take the shorter dimension ...
3
votes
0answers
330 views
leaflet - Drawing line following the road
Short version:
What I wish to be able to do is drawing a polyline along part of a road. In that way marking certain houses, along this road.
Long Version:
I have several houses that I wish to mark ...
2
votes
0answers
30 views
Find gap in / endpoints of linestring
I have a set of features of type linestring. I'm trying to polygonise the linestrings and assumed that they were closed (naive me :) ). Of course some were not closed and I'm trying to locate the gaps ...
1
vote
0answers
75 views
Line to Polygon via Polygonizer in QGIS
My question is in the same vein as this one.
I'm attempting to convert precipitation lines (Precipitación Media Anual) to a polygon for Mexico in QGIS using the Polygonizer plugin.
After running the ...
1
vote
0answers
107 views
How to merge linestrings which are connected with each other?
I would like to join linestrings which are connected to each other. The preferred output is a longer linestring based on all joined single linestings!
The table that holds my single linestrings is ...
1
vote
0answers
87 views
Break LINESTRING values in postgis into mutiple LINESTRINGs
Figure A below is the visual representation of what i have in my road data set. Line 1, Line 2, Line 3 in illustration are each represented as 1 row postgis DB inside a geometry column, some of these ...
1
vote
0answers
183 views
How to handle postgresql/postgis geometry type errors in a function?
I have created the following function in PL/SQL to make a polygon from a set of linestrings:
CREATE OR REPLACE FUNCTION _myfunction(
_fid integer,
_rid integer
)
RETURNS VOID AS $$ ...
0
votes
0answers
35 views
Diferent Line color and Diferent Markers at the same time
i'm about to develop a GIS Track App, but until now, i'm testing with some codes, that i've been creating, but for my project we are going to use XML as data records, today, i am able to create a ...
0
votes
0answers
28 views
Join Geological Linework based on shared attributes while obeying rules
I'd like to join all adjacent geology faults within a table if they share the same attributes in f_type, f_class, f_name and f_conf columns. However I don't want to join adjacent lines with equal ...
0
votes
0answers
32 views
How to add vertices to existing linestrings in mysql?
Is it possible to add a Point at the end of a Linestring in MySql?
For example I have a Linestring as
Linestring(1 2, 1 4, 1 6)
and I want to add a Point
Point(1 7)
at the end (output should ...
