Questions tagged [point]

A geometric element defined by a pair of x,y coordinates.

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1answer
100 views

Delete points on one side of a line in QGIS

I have a bunch of points and line that represents a boarderline as shown below: I want to delete all the points one the right side of the line, and letting the points in the left side stay. I dont ...
2
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0answers
68 views

Generate ID for the grid of points from top-left corner down [duplicate]

I have a grid of points extracted from a raster. I need to give them a new ID value to be able to join values from it to another grid in rotated system of coordinates.The automatically generated ID ...
2
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1answer
2k views

How do I extract points from a LineString or Polygon data frame and make a dictionary of point data frames?

I am building some pre-processing routines for 3D visualization of GIS data and I have several line and polygon shapefiles with multiple features. I want to extract the points for each of the features ...
2
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2answers
669 views

How to convert Point coordinates into CSV format?

The GDAL documentation describes how to convert a ShapeFile into CSV data. The layer create options (-lco parameter) allows to prepend the coordinates of Point features to the actual attributes values....
2
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2answers
644 views

Measuring distances from each pixel center (in raster) to each point (in vector) in PyQGIS?

I have one raster layer and point vector layer. I want to measure distance between center of each pixel in raster to each point in vector layer. I extracted x,y center of each cell and added them to a ...
2
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0answers
114 views

Shortest path tool failed in QGIS

I'm trying to find the shortest path between two points (green and red points) on a road layer using QGIS 2.12.3. The roads layer has appropriate CRS. Before sign the "start" and "end" points I ...
2
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1answer
6k views

generate random world point geometries

I have a world map. I need random point geometry. So, how can I randomly generate point coordinates? Any programming language. Also, I am using SRID 4326. Any programming language.
2
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1answer
403 views

Defining features geometry in new created layer using PyQGIS?

I'm trying to create points in a new layer with a given distance along all lines of another layer. Here my function so far: from PyQt4.QtGui import * from PyQt4.QtCore import * from PyQt4.QtCore ...
2
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2answers
4k views

Calculating distance between two points with QGIS 2.14.0

I have two shapefiles with the following information: List A: ID 1 | xA | yA | ID 2 List B: ID 1 | xB | yB | ID 2 {x;y} = {lat;lon} I want to calculate the distance between two points, e.g. ID 1: ...
2
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0answers
461 views

R coordinates on line nearest to point - multiple points

In R, I have a collection of points (~15,000) within a polygon. For every point, I want to calculate the location on the polygon boundary nearest to the point's location. I'm not bothered about the ...
2
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1answer
713 views

ArcMap Point Distance giving decimal degrees even when in projected coordinate system

I'm trying to calculate pairwise river distance among 60 XY coordinates in a small region of Mexico with ArcMap 10.2.2. I have defined my projections and projected both my stream network and XY ...
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2answers
213 views

How to Run Buffer on QGIS Points [duplicate]

New question branching off from Geometry Errors with Imported Shapefile, Unable to Fix I attempted to buffer datapoints to convert them into many small polygons (so it will be acceptable .shp polygon ...
1
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1answer
76 views

ArcGIS Random Point generator producing same points every iteration

I am generating random points to sample within a stratum. Data Management Tools > Feature Class > Generate Random Points This works just fine, except that I noticed the points I generated for ...
1
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1answer
545 views

Creating point symbology in SLD file

I would like to create a style file for a layer in Geoserver. I have point geometries and the SLD cookbook does give nice examples for the simple ways to create your symbology. However, I would like ...
1
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1answer
185 views

Batch processing multiple files with MCC-LIDAR?

I want to classify ground points from multiple LiDAR tiles (.las files) using MCC-LIDAR software. I already made some research and I have found this sourceforge thread; however, it is not that clear (...
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0answers
87 views

Point features disappear when adding new data

Recently while adding features to a point layer i noticed that once i had saved my edits the already existing points disappeared. Although not visable on the map all of them and their data were still ...
1
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1answer
496 views

QGIS create point data attribute as the name of the polygon it falls in

I'm working in QGIS with a point data set overlaying a farm with 140 fields. While I can analyse the points from each field individually, I would rather use an awk script to calculate statistics I ...
1
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1answer
2k views

Is it possible to join points to a polygon in MapInfo Professional v10.0?

This is what I have... ... and I would like to assign the points to the polygons that they belong to. In ArcGIS this is accomplished fairly easy through using Spatial Join, but I have no clue how to ...
1
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1answer
390 views

Create polygons from point dataset, where each polygon contains 3 points from the dataset [duplicate]

I'm using qgis Brighton I have a dataset of 1500 points. I want to create polygons, where each polygon contains n=3 points from the dataset. The aim of this is to have clusters of 3 points, which ...
1
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0answers
712 views

Distance Analysis from single point to multiple points on vector layers

Is it possible to do the following in QGIS: Create a text file that plots the distance from a single point (stored in one layer) and multiple points (stored in another layer). I have tried to use ...
1
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1answer
883 views

I can't see labels in GE of points exported from shp to kml in Qgis

I have created a shp layer in Qgis (version 2.12.3-Lyon) with points. I want to see it in Google Earth, so I saved the shp as a kml. When I open it in GE Pro, I don't see the labels, only if I click ...
1
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1answer
135 views

How can I assign attribute IDs to points in an 85000 point spread according to a grid scheme?

I am working on a pretty complicated grid system and cannot figure out a way to name each of the points in my shapefile. The X of the grid originally started with A and ended with AX. We have ...
1
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1answer
292 views

Create Point Feature with XY and Generate Multiple Buffers (ArcPy Tool)

I am trying to set up a custom tool via a python script in ArcMap. I want the tool to be able to create a point feature with X/Y input and then pass that point into the buffers. My thinking is that ...
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2answers
520 views

How to “select by location” certain points

I have a small problem - how to select the points on the line but not select the points at the intersections of lines using "select by location"? Illustration below. I am using ArcGIS 10.0
1
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1answer
1k views

How to add X/Y coordinates and count of overlapping points in a postgresql table?

How to add to my postgres/postgis table the following columns X coordinate | Y coordinate | count (number of points in same location) from an existing table populated with geometries type POINT
1
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1answer
410 views

Extracting the closest Point to a Line within a Polygon using ArcGIS for Desktop

I have the following shapefiles: Polyline: Detailing a road network. Polygon: Containing approx. 2000 polygons enclosing sections of that road network. Point: Containing numerous (OS Addressbase) ...
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1answer
899 views

QGIS - select or export point attributes by polygon feature

I have two layers, one polygons of boundaries (similar to say local government areas) and a point layer of hospitals. I want to select all of the hospitals within a particular area (ie a particular ...
1
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1answer
171 views

Visualisation of “dominant” point in each location

I had an idea for a kind of visualisation, and I'd like to know if it's been done before, what it's called etc. Basically it would visualise a single numerical quantity that varies greatly, at ...
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2answers
1k views

Creating points in interval 0.125 decimal degree using ArcPy? [closed]

I have a polygon shapefile. I want to create points at an interval of 0.125 decimal degrees in this polygon. How can I create a script with python in ArcGIS 10 to automate the process of create ...
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1answer
178 views

Can I use Point as the geom type in pgrouting?

in my table i have the field geom(POINT, srid) and its populated, this table also have the source an target field witch is blank(just like pgrouting guide). I tried the function pgr_createTopology() ...
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2answers
1k views

How to produce a 'count' of points intersecting lines?

Within ArcMap, I have a point dataset representing accident data, and a road dataset. My goal is to attribute the road dataset with a count of how many particular accidents occured on each road ...
0
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1answer
462 views

Geotagged HTML Pop in PDF

I am using ArcGIS to add geotagged images as points to a map which allows me to click on the point and an HTML popup comes up with the photo. http://www.esri.com/news/arcwatch/0912/import-geotagged-...
0
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2answers
268 views

Manually add a new point to PostGIS table [duplicate]

I did accidently delete a table row - or well, in fact a whole subway station. My attempt to solve the problem was this PostGIS function: ST_GeomFromText('POINT(coordinates)') But then PostgreSQL ...
0
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1answer
328 views

Draw horizontal lines on points shapefile using ArcGIS [closed]

I have one shapefile of 200 points in which I would like to draw one horizontal line of 2Km on each of those points. How can I do this?
-2
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1answer
833 views

QGIS and Python - create line with multiple points in postgis [closed]

How can I create a line, with Python functions, with many points that are records in PostGIS?