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Questions tagged [point]

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

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2answers
135 views

Android App to help digitizing point layers on a Tablet

In QGIS, using a pen on my touchscreen PC I can I can digitize a lot of points (e.g. 14000 pts in 2 hours) faster than with a mouse: without having the attribute form to show up I simply need to touch ...
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1answer
537 views

Defining convex-hull of (clouds of) points using R? [closed]

I have multiple (clouds of) points, and would like to take the outer envelope of these points. This will allow me to polygonize my points. Using the convex-hull would help me, but in some cases, my ...
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1answer
68 views

How should variable data related to a point be stored in a database table? [closed]

I've been having a bit of trouble understanding how a dataset is built/managed for GIS applications. Over the past few weeks (part time) I've been trying to understand the basics of GIS, and how it ...
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0answers
16 views

Points and polygon with same coordinate system do not line up in ArcMap 10 [duplicate]

1st, I added a shapefile with projected coordinate system SL_grid_99 to Table of contents. 2nd, I added my points (excel file) to the table of contents. I displayed XY data and exported point data as ...
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0answers
55 views

Disperse markers - trouble with input file?

I had an excel sheet listing addresses that I imported into ArcGIS and geocoded which created a File Geodatabase Feature Class of all the points. I am trying to display the map where it disperses ...
1
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1answer
115 views

How to create buffers around points in ArcMap when there is a lack of OID

I want to create buffers around points in ArcMap. Using the Buffer (Analyst) tool, I indicated 100m buffers around my points of interest. I get the error: ERROR 000339: Input price, ads (v8) - ...
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0answers
133 views

How to plot points from a CSV file into a country polygon in Arcmap?

I am trying to import points, which contain longitude and latitude data, to a geographic area (polygon) in ArcMap but they are not overlapping. I have added a point layer (.csv) to my table of ...
1
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3answers
200 views

Maximum number of returns per laser pulse in airborne LiDAR?

What is the maximum amount of returns a discrete aerial laser scanner is capable of recording? For example in a LAS 1.2 metadata under Point Data Records there is the category 'Number of Returns' ...
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2answers
415 views

How to make the coordinates of point appears as labels?

I am working on a school project that requires us to have a map with the points indicating different station with its coordinates appearing as a label. I just don't know how to do it? I think it ...
1
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0answers
57 views

Filling polygon with point in PyQGIS? [closed]

I found what seems to answer my question by @xunilk in this closed post: Filling polygons with points or polygons using PyQGIS? I follow the example of @xunilk with some modifications to adapt to ...
2
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1answer
82 views

Points in hosted Feature Layer causing rendering issues in ArcGIS Javascript API

I have Feature Service in my ArcGIS Online account that is made up of a number of feature layers. The feature service was created by publishing a file geodatabase. I am adding the Feature Service as a ...
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0answers
29 views

How to keep point number when converting to a line

I have a layer of point that I convert to a line with the plugin Point2One to be able to do apply a smoothing with the generalizer tool. It works well! then I convert my layer back to points using the ...
2
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1answer
48 views

How to find the closest stop point PostGIS

I have Point geometries created from lat,lon I loaded all the 10,000 stops in a certain city using gtfs i would like to query my db to find the closest stop reference to my point. the staypoint ...
1
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1answer
149 views

Count points in polygon (weighted) for multiple attributes in QGIS 3 in one go

Is there a way to count weighted points inside polygons for multiple attributes at one time? I can count weight points (below) for an individual attribute, which creates a new polygon layer with an ...
0
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2answers
69 views

Creating Custom Shapefile that can be snapped in location with no dragging using QGIS?

I am trying to create a custom shapefile consisted of 16 waypoints orientated around an origin point. the 16 waypoints are to be 2m apart from the central waypoint (like an axis, with 0 being the ...
1
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1answer
87 views

Estimate the spatial relationship between two sets of points

I have two sets of point data, structured like below. Table A long | lat | class ... | ... | A ... | ... | A ... | ... | A Table B long | lat | class ... | ... | B ... | ... | B ... | ... | ...
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1answer
286 views

A line between point to nearest neighbour point using QGIS

I have a layer of points in QGIS which represent electric poles How do I create a polyline layer that would have lines running between the poles so it can represent the the electric cables that ...
0
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3answers
149 views

Adding value of overlapping point features?

I have several different point feature classes (shape files) spread on a grid, each point (located at grid centers) has a attribute named value. For example, assume we have a 3x3 grid, which has nine ...
1
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1answer
962 views

Showing route between two points in OpenLayers 3

How will I show the route between two points? I have created points with below code. var iconFeature = new ol.Feature({ geometry: new ol.geom.Point([8637791.36, 1456487.82]), ...
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0answers
27 views

Define polygon with even number of points?

I have the following problem..... I have a client that needs an equal number of schools divided up between 8 different zones. The state I am looking at is the state of Maryland. They want to use ...
0
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1answer
39 views

Calculating distance between multiple points using ArcMap? [closed]

The shapefile I created contains 5 points. Their FID's are (0,1,2,3,4). I need to calculate the distance between all of them. The output table should contain the following info - points to compare ...
0
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2answers
137 views

Atlas map generation in QGIS using point layer only

I am trying to automate generating maps with Atlas using points only. As the snapshot shows the data points for each village is shown by a color. Every four villages fall under one health area. There ...
2
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2answers
65 views

Performing multiple intersections between two polygon tables and one raster table in PostGIS?

Trying to perform an intersection of an intersection in PostGIS. Its an intersection between a point table, polygon table and a raster table with different number of rows. The polygon table is the ...
0
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1answer
101 views

Spatial distribution based on point data

I have a specified geometric boundry with three data sets that correspond to rainfall measurements at three stations of which two are outside of the geometry and one inside. I would like to find a ...
1
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0answers
63 views

Analyzing single Polygon or Polyline that overlaps itself using ArcObjects?

My current process is to determine obstructions in an area and determine properties of those obstructions as they relate to a centre polyline. Per the image below I take a polyline which denotes a ...
2
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0answers
34 views

Creating networks and regions KML in R

I have >500 very large KMLs that contains only point data and a reference to a .png pop-up Each KML looks like this <kml xmlns:xsd="http://schemas.opengis.net/kml/2.2.0/ogckml22.xsd" xmlns:xmlns="...
1
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1answer
160 views

ST_DWithin query throwing 42601 error?

I am trying to get from a particular point more informations about the surroundings (which are also points). So I wrote this: SELECT * FROM osm_point WHERE ST_DWithin(way,(ST_SetSRID(...
2
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2answers
163 views

tool for point aggregation and mean calculation

I have the huge number of points spread across some map. Is it possible to calculate the mean value of a parameter in the points of a small area and make one point for the same so that the total ...
3
votes
1answer
118 views

Splitting line in proportional parts in QGIS

I have recorded flight paths of birds as lines. Now I want to transform the lines to points, which represent the bird's position in a minute interval. For this, I want to divide the lines by the time ...
1
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0answers
114 views

Point displacement between map (Cesium 3D) and raster (numpy array)

It is better to show than tell: On this image, the layer below the colorful shape is a trivial heat map in raster format. The colorful shape is the product of the skimage.graph.MCP_Geometric method. ...
1
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0answers
40 views

arcpy.Project_management is projecting points but not polygons? [closed]

In my current project, I am grabbing data from a web service and want to change the projection before inserting into a production db. For some reason when I am projecting the data, some of it is being ...
0
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1answer
45 views

Identifying the greatest value point within each polygon

I have a series of polygons (4,000) and a series of points that exist on the perimeter of each polygon (3 to 5). The points refer to the elevation value which has previously been extracted from a DEM ...
0
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2answers
64 views

Loading Point Layers on Smartphone

i calculated some Pointlayers with Qgis and i want to find them in the field. Can i load these points including the GPS-data on mysSmartphone and use it as a GPS-device? Are there any Apps?
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0answers
47 views

Using ArcMap add x y data, points are in wrong location [duplicate]

According to ArcGIS esri when I add a CSV with the "add XY" tool, * "The tool automatically adopts the data frame’s coordinate system"*. Since I'm importing a csv with no defined coordinate system, I ...
5
votes
1answer
202 views

Select point by number of overlapping features

I have this polygon layer converted to lines, and had the line nodes extracted using Extract nodes. The resulting point layer has several overlapping points because of common borders with adjacent ...
1
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1answer
156 views

Group nearby points and find center point for each group

I'm currently working with a point shapefile derived from OSM that displays intersecting vertices of a road network. This shapefile has had duplicate geometries removed, resulting in a single point ...
1
vote
1answer
40 views

Select/export point features where the value change in two fields within the layer is less than a 5% change

I have a point layer that has two fields representing the distance (in feet) of a point feature to coastline (old distance vs. new distance). I want to crosscheck both fields to see the accuracy of my ...
3
votes
1answer
349 views

Project a point onto a profile tool graph in QGIS

I'm using the Profile Tool add-on in QGIS to extract a profile of a raster data layer. Along this profile there are a series of points which I'd like to project onto the Profile Tool graph so that I ...
1
vote
1answer
335 views

Openlayers 3. OnClick on touch device not triggering perfectly

I have the forEachFeatureAtPixel function and try to trigger an event on click on a point layer with a custom icon. However, the performance on touch devices is really bad. I need to click several ...
2
votes
1answer
132 views

Is there a way to calculate length of linestring from one point to another?

If I have one linestring and coordinates of two points on that linestring, what is the easiest way to calculate not shortest distance from those two points, but distance over the given road (given ...
1
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0answers
96 views

How to calculate sum of values in a point shapefile within a moving window

I have a point shapefile that has a 'rank' attribute with numbers between 0-100. I need to calculate the sum of this value for points within a 10km circular moving window anywhere within my area of ...
1
vote
2answers
134 views

QGIS: Is there any interactive tool to select previous or next points using fid/attribute table order?

I have a huge point file (4933873 points, currently in GeoPackage)) looking this way: imported from a CSV of following structure: Captured Time,Latitude,Longitude,Value,Unit,Location Name,Device ID,...
0
votes
1answer
31 views

Display all values in MapServer layer

I have a MapServer map file that gets data from PostGIS tables. One of the tables holds several linestrings that I set as points in the map file. They show up based on the zoom-level in my map. Is ...
1
vote
0answers
138 views

Points won't display on map using OpenLayers 3 and MapServer

Im constructing a Vector-tile map using data from the following site GeoNorge -N5000. Im constructing it using OpenLayers 3 and MapServer with the data being passed from a PostGis database. I've ...
2
votes
2answers
110 views

Best site location to plant trees

I would need to find out which is the best location to plant new trees on a plot of land I already have. I´ve created a vector file for the plot(polygon) and another one (points) to indicate the ...
1
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0answers
149 views

Calculating Moran's I on large point dataframe in R

I have a dataset of about 77,000 points of which I want to test autocorrelation. I have tried to compute the test statistic using the testSpatialAutocorrelation tool in the DHARMa package, which uses "...
0
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0answers
47 views

Automatically Trigger write fields from polygon to point when adding point

When editing, I would like to create an SQL trigger that will write fields from my parcels layer to a point layer that the end user is editing. Essentially, when a point is placed on a parcel, that ...
0
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0answers
100 views

Points to a 1km x 1km cell grid

I have a large database of point data throughout all of Eastern Australia. Each point represents species presence/absence data and has attached about 18 predictor variables. To account for sampling ...
3
votes
0answers
110 views

Grouping neighbor points based on field sum in QGIS

I have about 14,000 points. These points have a specific field "time", an integer value, mainly between 1, 2 or 3. I would like to split these 14,000 points into groups based on the "time" field ...
2
votes
1answer
235 views

Compute mean attribute value of point features in same category?

I've got a point shapefile wih a column with categorical variable and a column with numerical values like the one below Point | crop | NDVI 1 | wheat | 0.9 2 | barley | 0.7 3 | ...