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

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3
votes
1answer
92 views

Clipping points by a polygon attribute in QGIS

I am trying to clip a point layer with a polygon layer. My polygon layer has multiple polygons (e.g. country with different states). I am wanting to clip the point layer based on the different states ...
4
votes
1answer
117 views

How to interpolate missing data from neighbours in PostGIS?

I have a dataset with point data within a given country. Let's say my dataset looks somewhat like this: tree_id | species | age | geom ------------------------------ 0 | Ash | null| ... ...
2
votes
0answers
58 views

Equal distance points on polylines

In QGIS 2.10.1 I want to create a point layer out of my polyline shapefile and all the points shall have a fixed distance (in meters) while I use WGS84 as coordinate system. So what do I use for this? ...
1
vote
1answer
47 views

Is is possible to extract aspect values from raster based on vector point locations?

Looking for ideas on a workflow in QGIS: I have an Aspect raster layer and a point vector layer from the same area. Such point data represents localities of interest for a particular study. Is there ...
3
votes
2answers
81 views

How can I display points with points displacement renderer without circleoutline

I understand the point displacement, but I would like to display the circle without the circleoutline. Even when I change the "circle pen width" to 0,00 it displays a fine line. And there is no ...
6
votes
1answer
345 views

Performing cluster analysis in R with Point Datasets

I am a R-Beginner, but I want to use it for some spatial statistics. I want to check the relation between the occurrence of ill persons and the existence of water in a area of interest. To give you a ...
-3
votes
1answer
183 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 ...
3
votes
2answers
6k views

How to find nearest point for each point in current layer using ArcGIS Desktop?

I have a point layer and want to know the distance of nearest point of current layer for each point in the layer. I found some tools in ArcToolbox about it , but they need two layers for input and ...
3
votes
3answers
876 views

How can I disperse points within polygons using ArcGIS?

I have huge number of points. These points are within polygons. I want to disperse the points in the polygons randomly. I tried to use the disperse point extension in Arcview, but it was not useful ...
2
votes
0answers
50 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 ...
0
votes
1answer
45 views

Line sections between points in ArcMap?

How to get shape with lines between points which have to lay on the same line entity?
5
votes
1answer
450 views

How to compare two sets of points in QGIS?

I have two point layers with XYZ data; one set are points measured in the field and the second set is a Lidar data set. I want to check the accuracy of the Lidar in comparison to the measured data. ...
1
vote
2answers
129 views

How to select points within a certain distance from a line?

I have a file with a points layer and a lines layer. I would like to select only the points that lay within certain distance (a couple of meters) of the lines. Is there an easy way to do this? Or ...
-1
votes
1answer
102 views

Single point in R

My question might be very simple. I want to create a single point (with xy coordinates) in a specific region, in a specific position. I don't want to do that with qgis I want to do that in R. Is there ...
0
votes
2answers
39 views

Calculate how many points a route goes through

Is there a way in which a route mapping interface can determine how many points a certain (user created) route has 'touched'? In the sense that firstly: I have a set of markers or points (e.g. ...
2
votes
1answer
105 views

What is CID field created by Create Random points?

In ArcGIS the result of Create Random Points tool when using a feature class to constrain the extents has an attribute called CID. What do the values in this field represent?
0
votes
1answer
90 views

How to insert long/lat value in postgis database in the form of Point(x,y)?

I am having some trouble in inserting long/lat in the form of point. Currently, I have array of long/lat value and which I want to store into database in the form of point. However, I am unable to ...
2
votes
1answer
341 views

How connect points with lines in QGIS?

I need to connect points with lines in QGIS. I am in this fresh out so I'm not sure how to do it and I need a little bit help with this. I read several posts i and tried to do something about it but ...
0
votes
1answer
51 views

Adding a point-shape file to a raster image with no spatial information

I have a raster image (JPG) of a fictional map from a fantasy book. I want to add a point-shape file in order to show main events from the book upon the map. My map has no spatial information (as ...
6
votes
2answers
4k views

How to remove duplicate point features?

I have created many .gpx datas with my Garmin device, but due to the amount of data, I have imported the mapping data from my device several times (also because I didn't want it to be lost)... As a ...
1
vote
2answers
82 views

Switch selection of specific polygon

I'm using ArcGIS 10 desktop version. I have a number of polygons, let's say 300, in a layer. Each polygon contains information of schools, ranging from 100 to 250 points, in a separate point layer. ...
6
votes
2answers
258 views

How can I average point features spatially in QGIS?

I have a GPX file with track points and I want to average the points spatially to improve accuracy of the point feature. I can't just make a polygon and find its centroid as the number of overlapping ...
1
vote
2answers
393 views

How can I represent Time in GeoJSON?

I'm modelling a bus route as a series of waypoints. Most of these waypoints have just a latitude and a longitude and represent points along a road. However, when the bus gets to a bus stop, the ...
2
votes
2answers
144 views

How to visualize updating lines of bearing from a point

I'm working on a project where I need to visualize a constantly updating line of bearing from a point, based on degree of rotation around that point. My plan is to design a line feature with an ...
4
votes
2answers
308 views

Creating a circle with points

I want to arrange 96 points as a circle/ring. Is there a way to make this automatically, for example "Buffer", "vertices"?
2
votes
3answers
85 views

Finiding Duplicate in buffer distance?

i am desperately looking for solution for one problem. i am having one Point Shape file, i need to check that if there is any duplicate point nearby(lets say 10 meter). i am not familiar with ...
0
votes
1answer
124 views

Highlighting point using ArcGIS API for JavaScript?

How can I highlight a point using ArcGIS API for JavaScript? When I use the function of centerAndZoom, I also want to highlight this point.
2
votes
1answer
104 views

Create points symbology with more than one parameter

In QGIS i would like to create symbology for points layer where the symbology will take into account more than one parameter (currently two). i.e.: My points layer has street names and house numbers ...
0
votes
0answers
38 views

multiple attributes in csv file to raster

I have a several large comma separated text files each with multiple attributes. Each text file is about ~2.9 GB with 21 million lines. Each line contains X, Y, VALUE1, VALUE2, VALUE3, etc. The X and ...
5
votes
1answer
264 views

Why aren't there LiDAR records in some black and white parts of the scene?

This is the actual scene: This is the corresponding LiDAR scene: The LiDAR data is from xyz file. The questions are: Why are there no points for the dark squares on the checkerboard as well ...
0
votes
0answers
24 views

Space points out a minimum distance along a line

I have just snapped thousands of points to the polylines they share attribution with but a lot of the locations overlap slightly. I would like to create a minimum distance between points. I DO NOT ...
3
votes
1answer
75 views

Find all points within 5m with same name on large dataset

I have a large dataset (500,000 rows) in cartoddb which contains data like this.(abbreviated for easier typing) cartodb_id | count | lat | long | name | the_geom 1 ...
2
votes
3answers
1k views

ST_MakePoint or ST_PointFromText to generate points

I'm new to postGIS and am having trouble finding an answer to this question. I have loaded UK postcode data (OSGB36, SRID 27700 with eastings and northings fields) into a postGIS database. I now want ...
0
votes
1answer
57 views

How to remove points in QGIS?

I have way points of my field work, but some of points I saved are not related to my project. How can i remove them in QGIS?
2
votes
1answer
33 views

.net arcobjects delete point feature by one of the attribute value

What I want is to delete a feature by objectID, currently I have got the objectID of the related feature, but I have no idea how to delete the feature, can anybody give me some advice? The ...
2
votes
2answers
1k views

How to create a series of points along multiple polylines at once in ArcMap 10

I have a series of polylines that represent linear vegetation (shelterbelts, etc). I need to convert these to a series of points equally spaced in order to add them to a different shapefile that ...
1
vote
1answer
52 views

Finding Point Counts in Multiple Ring Buffers for Multiple Point IDs Using Python

I have a shapefileA that has 13 points. Each of these points is coded with a unique ID from A to M. I created 10 different buffers (representing different distances) around each point via the ...
0
votes
1answer
23 views

Comparing distances between old and new Esri geocode locator points

I need to check the accuracy of the locators between Esri's Streetmap 14_2 and Streetmap 15_1. The two layers need one to one distances measured between points that have the same attributes i.e. same ...
0
votes
0answers
82 views

Creating an interactive map that uses a point shape file to display information

I have a raster map, a PNG of a fantasy map, which has points on it. I want to create a interactive map that displays information (text) whenever you click on a point. An example of what i'm after ...
1
vote
1answer
67 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) ...
0
votes
1answer
33 views

Extracting point data / WMS out of (browser) geoviewer

How do I extract point data out of a browser-based map? In particular, I need the park and ride points from http://wegenenverkeer.be/carpoolparkings, but I cannot find their WMS or shapefiles, ...
1
vote
1answer
109 views

Django Postgis Distance from point

I have a point where the objcet is and another point for mylocation. I want to calculate the distance >> object_location <Point object at 0x7f9ceaac7be0> >> mylocation <Point ...
0
votes
0answers
19 views

How to access point maker

I have been trying to create random points on ArcGIS, my problem is I want them to be circular and have uniform distance between them, was reading somewhere and found out there is a script called ...
0
votes
0answers
32 views

QGIS and Ghydraulics: add attribute fields from intersecting points to line layer

I have lines (pipes) and points (junctions). There is one point at each connection between two lines, so that every line has a start and an end point. Now I want to fill the attributes "start point" ...
2
votes
1answer
223 views

Update xy fields when I move points?

I have a point shapefile in edit mode, containing x and y coordinates. When I move the point to another location, the x and y coordinates do not update to the corrected location. I realize the x and y ...
0
votes
0answers
63 views

Multiple points showing as single point in ArcMap

I have a shapefile containing numerous point features with different coordinates showing the locations of schools for an area. When I add this file to a blank map in ArcMap all of the separate ...
1
vote
0answers
57 views

need to split some linestrings by points

please help me, i'm new in gis 1) i have а table with geom railways, which are multilinestrings (for example there are 2 ways one of which is interrupted, so this way will be multilinestrings ...
2
votes
2answers
363 views

How to calculate distance between points on a line in arcgis?

I created a series of points along a line (as a single feature point), in ArcGIS 10.1. I want to know the distance from one point to the next point along a line. I would also like to know the simple ...
1
vote
3answers
107 views

Generate line from unordered set of points

What is the best method to take a set of points and generate a line? There are too many to simply guess a "connect-the-dots" situation & These points do not have an attributes in which they can ...
1
vote
1answer
153 views

Grouping points based of user-provided distance in ArcGIS for Desktop?

I have a point layer and I need to group/aggregate the points within a 1km proximity into 1 single point to create a new point layer. I was trying to use Aggregate point and then Feature to point, ...