# Tagged Questions

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

294 views

### Divide polygon based on points for even distribution

If I have a point layer, how can I create a polygon that includes all of the points and divide that polygon into n sections in which each section contains an equal number of points? Preferably in QGIS,...
95 views

### How to create more than one mean coordinate in QGIS?

I have a point shapefile with several thousands of points in it. I've split the points up into spatial groups using a vectorgrid and pointcount. I wish to create a mean coordinate for each group of ...
313 views

### How to perform Shapefile to Raster with ArcMap 10.1 while preserving resolution and values?

I am new to ArcMap and I would really appreciate some help. I want to create a new raster using a value in a column of a point shapefile. I have a point shapefile with points equally spaced and each ...
184 views

### Finding lines in point patterns?

I have a point pattern (see below) in which I assume to find "significant" lines of points. However, I did not find any method that is integrated in a GIS or in R that searches for such line pattern ...
596 views

### Offsetting Points by location

Sorry If you've read this before - I've tried to change the content so that it reflects what I need a little better. This question was marked as a duplicate although I read the the answer to the other ...
218 views

### Is “puntal” an accepted and defined geometric term?

There are definitions for the geometric qualities of polygons and lines: polygonal: Having many angles; hence characteristic of a polygon. Ref: http://en.wiktionary.org/wiki/polygonal ...
230 views

### Code-Point Polygon Data and Google Maps

I'm currently working with OS Code-point polygons and google maps coordinates. I have google maps point coordinates for a list of houses which are located at the center of each full postcode (...
232 views

### How to convert a line to points?

I'm working with QGIS and I want to convert a line into many points, does someone know how? Thanks.
130 views

### Determining closest representation of polygon as collection of points+radii

Have a bit of a tough question, which I realize there may not be an easy solution to. Figured what better place to ask. I'm attempting to transform a polygon into a series of arbitrary points with ...
4k views

### Generate random location within specified distance of a given point

In a simulation (not using any GIS), I need to generate a random location that is within a specified distance of a given location. I found a very helpful post here on this exact topic: How to ...
907 views

### How to do a Point to Polygon analysis with multiple variables in QGIS?

I have a database of almost 10k crimes, which are divided in to 10 categories and plotted on a map I also have a database of 12k addresses, which are also plotted on the map. I aim to perform a ...
40 views

### QGIS adding points using decimal degrees [duplicate]

As duck blind permits are sold, we need to add the location using lat/long. we are working in ArcView now but would like to move to QGIS- Everything I was able to find seemed to deal with importing ...
905 views

### Arcpy Error 999999: Error executing points to line. Coordinates or Measures are out of bounds

I am selecting two points from a table and then doing a points to line function. I was originally getting this error because they were multipoints with multiple locations. I ran Multipart to Single ...
2k views

### How do I write a MYSQL spatial query to find all polygons (rectangle) that contain any points in a table?

Something like: SELECT * from polygons WHERE bounds CONTAINS(SELECT geom_point from points) Can someone help me out with the syntax? Bounds will always be a rectangular polygon and everything is in ...
135 views

### How to convert a set of points to a polygon based on a specific field in QGIS

I am having a point shapefile that consists of a number of point sets. I need to convert these points to a polygon based on a particular field in attribute table say for example locality . How can i ...
3k views

### How to select all points within a circle in PostGIS?

I have set of points in a PostGIS Table (Type Geometry). Now, I need to filter points that lie in a circle with a center (C) and radius (R)! I expect C to be of type Point or Coordinates.. R to be ...
433 views

### Python Delete point in a distance of x meters

I took this code from this source Select maximum number of points more than x meters apart It seems to work for other users, but for me it's an endless loop. I do not understand why, though the code ...
2k views

### PGROuting 2 : Getting nearest node to a given point (with lat - long given)

I have a point whose latitude and longitude (only) are known, and a table of nodes with their geom. I want to find the closest node in the table to the given point. I think I can achieve this with ...
75 views

### How many polygons under a point (ArcGIS solution preferred)

Opposite of Point in Poly. How many polygons underneath a point. I have a point layer with many points. I have a polygon layer with many polygons. I need to add an attribute to the points that ...
755 views

### ArcPy Create Point Along Line A Specified Distance From A Specified Point

In ArcGIS Basic I am trying to take a road polyline(one segment for the entire length of road) and get a point placed on the map a specified distance from an intersection. I have a layer of ...
1k views

### Using NetCDF for point time-series observations?

I have a large growing dataset of water and climate observations for several years in regular hourly time-step. The number of locations is cca. 1000 locations with latitude, longitude coordinates. At ...
80 views

### point shape file problem

I have a point shapefile which was created from a text file in Excel using the delimited text layer plugin in QGIS. My problem is that I am getting a point shapefile but when i try to insert this in ...
187 views

### How to create a polyline feature from a point layer

I would like to create a route line based on a point layer. The existing tool does not meet the customer requirement. But using the code snippet below, the start point and end point are always the ...
45 views

### How to handle a UnicodeEncodeError with sampling tool?

I'm using qgis and I keep getting an error when using the point sampling tool, its keeping me from getting the sampling done. Does anyone has an idea what is it about? Thanks!
127 views

### Calculating point proximity in ArcMap 10.1

I have a geocoded point file which (theoretically) contains one point for every zip code in the U.S. I want to create a smaller list of zip codes from this file. The list should include only those zip ...
348 views

### Linked point geometries to linestrings in Spatialite

I have been parsing Canada's radio system frequency open data. It's a single large table per province, containing point geometries for each station callsign. Where a point-to-point link is defined, ...
382 views

### Sum of point attributes inside hexagons using QgiS UI

I'm very new to Qgis so I would very much appreciate any help you can give me. I have a point shapefile that corresponds to locations of animals captured. I've joined a table to this shapefile with ...
54 views

### How can i display the color of my labels into the content table?

The thing is that i need to display labels based on colors but without the symbol. In this case i'm working with points in Arcgis 10 and the maps needs to display only labels with color-based ...
1k views

### How do I find the average distance within a polygon to a point?

For my purposes, I can assume a homogeneous distribution of points within the polygon. What I want to find is the average distance from points within a polygon to a specified point. I don't know where ...
226 views

### WMS: point “pointer” symbol with offset - getFeatureInfo search area slight mismatch

I'd like to ask what ways there might be to adjust a point's getFeatureInfo search area so that it matches a "pointer" (i.e slightly offset) symbol. We are running GeoServer 2.2.0 (part of an Opengeo ...
2k views

### How to draw lines from two points in a CSV?

I have a CSV file where one line looks like this: Duration, user, lat-start, long-start, lat-end, long-end 298, Casual,38.9101,-77.0444,38.91554,-77.03818 Each row in the CSV has two points and I ...
314 views

### interpolate point values to line

This might be a stupid question and I apologize if so. I have count data for different trails. They are points and I would like to make an average of those counts for each trail so that each trail has ...
172 views

### How to add attribute in shapefile guidedly

I have a point layer (31 by 31 grid = 961 points) created by fishnet tool > feature vertices to point tool (but with duplicate points). NOx Concentration data are in an Excel file. I want to ...
717 views

### How to solve routes to offset points in Network Analyst?

The scenario is that there are points on a grid with intervals of 1000m covering an area of hundreds of square kilometres. I want to find routes on a road network to any one of these points. A road ...
1k views

### how to split a line by a point which is on the line but not in the linestring itself?

i need some help with the following: i have a linestring - geom i have \$lat,\$lon (using some php syntax) i have an osm table with the roads geom, i am trying to get closest point, and then split ...
305 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 ...
2k views

### Better way to get raster values for a large number of point features?

I have several projects with tree point features (SpecialStatusSpeciesPoint) that contain up to 2,000,000 records. I am trying to record tree height (Hgt) and base elevation (BaseElev) values, based ...
1k views

### How to average values in a point layer with respect to polygon layer in QGIS?

I am new to GIS and have the following problem: I have 2 layers: a point layer with a column that contains numbers (pollution index from specific measurement point) and a polygon layer with different ...
762 views

### Bearing Distance to Line tool from dBASE table only draws one line in ArcGIS 10

I am using the Bearing Distance To Line tool to draw geodesic lines to points defined by a bearing and distance. This is an aside, but I will then use the Feature Vertices To Points tool to convert ...
2k views

### Getting polygon shapefile node coordinates and point order

I am trying to get the coordinates of each node of a polygon in QGIS. What I basically did is use the following tools: Vector -> Geometry tools -> Extract nodes Vector -> Geometry tools -> Export ...
90 views

### Representing multiple attributes of single point feature with icons?

I always wondered if there's a way to represent using an array of various icons multiple attributes of a single layer containing point features. For example, think about a point feature with these ...
215 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 ...
61 views

### windows function with points in a mixed (multipoint/point) table

I have a table comprising multipoints (tracks) and points (stops between tracks). there can be several consecutive multipoints. now, i want to merge any points lying very closely to each other (...
240 views

### Is it possible to update only latitude or longitude in postgis?

I have a postgis database that contains Points created based on a couple (longitude, latitude), and I need to update only one of those two for a given point. I found that it's possible to do so but ...
11k 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 ...
95 views

### Counting points in a raster

Is there a way to select points in a raster dataset by raster classification? I have a floating point raster created from the points, classified into 4 ranges by standard deviation. I want to find out ...
272 views

### Divide polygon layer by point layer in QGIS?

I have two layers - one polygon layer that is a buffer of a road layer, and one point layer that shows certain locations along that road. What I want to do is to divide/split the polygon layer at the ...
1k views

### create grid cells of fixed dimension around a point acting as a centroid

I've been trying to solve a problem for the last few days but not having much luck. I'm hoping someone here can point me in the right direction. I'm new to ArcGIS so I hope my explanation makes ...