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

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10
votes
5answers
5k views

How to randomly subset X% of selected points?

What methods are available in ArcGIS 10.2 to randomly subset a selection of points. For example, in the attached screenshot I am interested in keeping 20% of the selected points and deleting the ...
4
votes
1answer
88 views

Create uneven, different diameter ellipse around point in QGIS 2.10

I am trying to make an attribute to show the uneven spread of the crown of a tree using the four cardinal points. I can use a buffer to show one feature, in this case a root protection area. But I ...
1
vote
1answer
82 views

2D point cloud to polygon

There was similar questions, but not exactly what I need, so I am asking here. Is there a way to create polygons from these points in the picture? >> The result I want to achieve in this picture >> ...
3
votes
2answers
156 views

Point file to raster

I have a point file of trees in my study area, which includes the attributes of each tree. Each tree also has a crown radius associated with it. I need to summarize the attributes of these points ...
0
votes
0answers
44 views

How to calculate Spatial Autocorrelation of grouped points in ArcMap 10.2.2

I have 32 points uniformly distributed with 7 attributes that comprises continuous values. I used the Grouping Analysis tool in ArcMap 10.2.2. I set 2 groups that have clear differences and are also ...
2
votes
3answers
3k views

Can ArcGIS only merge two shapefiles each time?

I need to merge multiple point shapefiles (in the same directory) into one point shapefile. After inputting these shapefiles and merging it, I found the final output only contained the data from two ...
0
votes
1answer
41 views

Adding Points to existing attributes [duplicate]

I have a table of 150 records which I was able to geocode except for 21 points. I'm able to manually geocode the rest of these 21 points. Every time I add the point, it creates a new row (which I know ...
2
votes
1answer
60 views

Combine digital elevation model (DEM) with point layer (QGIS)

I have two layers: The first one is a digital elevation model (DEM) as GeoTiff. The second is a point vector layer (start and end of street segments). What I want to do: Add elevation information ...
1
vote
0answers
20 views

Specifying rectangle symbol with height/length based on attributes values in mapfile?

I need to specify a rectangle symbol in a mapfile. The symbols should be of varying dimensions based on height/width values stored in a table's attributes. Is it possible to do something as with the ...
3
votes
1answer
187 views

How to find the concave hull for a cloud of points in 3D space?

The existing algorithm for convex hull is not able to capture the feature for a set of 3D points. Moreover, I found few mathematic tools have this function to obtain the concave hull and their ...
3
votes
1answer
34 views

Displaying nearby locations as 1 point (QGIS 2.8 Wien)

I am using an excel file to store all my locations and their attributes. This excel file contains coordinates of the same location measured on different dates. This means that the coordinates are not ...
5
votes
2answers
170 views

How to extract value from a raster based on lat and lon?

I have several netcdf files that I can read using the netCDF4 library in python. The data is gridded in 4320 rows and 2160 columns. I also have a list of lat/lon (in decimal degrees) and I am trying ...
1
vote
0answers
29 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 ...
7
votes
2answers
2k views

Easily find centre point of a raster in ArcMap 10 document?

If I have, say, a rectangular and georeferenced raster file loaded in an ArcMap 10 document (.tiff w/ associated tfw), how do I easily find its centre point and store that point in a points vector ...
0
votes
0answers
53 views

Finding distance and angle to points in point buffer, from center of buffer?

I have a number of buffer circles that contains some interesting points (the green points in the picture). I would like to find out the distance and angle from each buffer center (that I have in the ...
2
votes
2answers
86 views

Convert point to line

A little background: I recently completed a long bike trip and used a GPS to gather data during the ride, including average speed and elevation loss/gain. I imported the data into QGIS. These data ...
0
votes
0answers
22 views

How to disperse points in ArcGIS for iOS?

In the application I'm developing, a lot of points can end up having identical (x,y) coordinates. I'd like a way to spread them out so that a user can interact with them all, but the only things I've ...
2
votes
1answer
90 views

How to prevent markers overlaping other markers on map using QGIS 2.2.0

I have points with similar coordinates and displaying them on a map of Latvia they overlapping. How can I display all the points using QGIS 2.2.0 like in Finnish map?
1
vote
1answer
760 views

Generating Point from Centroid of Polygon falls outside of it?

I have a feature class of polygons within a geodatabase and I'm trying to generate points based on the centroid of the polygon using the Feature to Point tool in ArcGIS 9.3. However, I end up with ...
1
vote
1answer
40 views

Adjusting sampling points to closest land surface QGIS

I have many sampling points in mangroves of Southeast Asia and am trying to extract climatic data for each using the WorldClim dataset. However, many of the points fall on areas classified as "water" ...
1
vote
1answer
61 views

How to add points to line at every polygon/polyline intersection and have attribute table including distance of new line sements

I am working with polyline shapefile. I need to add point data at every intersection of polyline/polygon which was no problem->simple intersection. Problem is, points were not added to the ends ...
0
votes
1answer
29 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. ...
2
votes
0answers
31 views

How do Wikipedia maps add a coordinate point to a base map?

On wikipedia pages for localities, there is often a map on the right side of the page in the introduction, and the map is tagged with the point of the locality. For example, see below: ...
3
votes
1answer
68 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
110 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
49 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
33 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
63 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
291 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
174 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
5k 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
781 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
39 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
402 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
94 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
91 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
36 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
67 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
66 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
168 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
43 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
77 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. ...
5
votes
2answers
180 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
261 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
120 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
282 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
83 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
77 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.