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Questions tagged [point]

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

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3answers
49 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 ...
0
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1answer
27 views

Showing route between two points in open layers 3

How will I show the route between 2 points? I have created points with below code. var iconFeature = new ol.Feature({ geometry: new ol.geom.Point([8637791.36, 1456487.82]), name: ...
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0answers
23 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 ...
1
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1answer
22 views

Calculating distance between multiple points using ArcMap?

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 ...
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0answers
30 views

Labeling multiple points with coordinates?

I am working on a bridge project. I have point location of all the bridges with multiple years of project. Through ArcMap (10.3.1) I want to label (for years). Since same bridges have multiple years ...
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2answers
52 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
38 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
50 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 ...
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0answers
32 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 center polyline. Per the image below I take a polyline which denotes a ...
2
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0answers
26 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="...
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0answers
29 views

Disable blue point on anchor with OpenLayers3

I'm trying to move an icon on a map but there is a disgracious blue point corresponding to the anchor position. Is this possible to have an invisible point, please ? And, is this possible to move my ...
1
vote
1answer
57 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(...
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0answers
24 views

ArcGIS loses values during conversion of point to raster

I have feature point and I would like to convert it to raster. I used tool Point to Raster successfully. The problem has occurred when I compared sum of the raster values to sum of the filed from ...
0
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1answer
31 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 I ...
1
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0answers
35 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. ...
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0answers
36 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
31 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 ...
5
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1answer
64 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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2answers
70 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
26 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
40 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
91 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 ...
1
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0answers
42 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
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0answers
24 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 "...
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0answers
27 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 ...
2
votes
1answer
26 views

Auto snap of point features with lines

I want to snap my point feature with Line features. So That I can perform join attribute by location to read attributed from points into lines. Is there any way I can do this task automated. Once ...
1
vote
2answers
83 views

Using points2one?

I downloaded the points2one plugin and tried many times to connect points to a line, but it never works. Is there something that I set wrong? I tried the answer,but it has been running 10 mins, and ...
2
votes
1answer
46 views

QGIS, exporting geometry columns doesn't give decimal degree coordinates?

I am working on a project in qgis with my distance and coordinates units set to degrees and decimal degrees. However the shapefiles I work with have meters listed in their 'units' section (under ...
1
vote
2answers
85 views

Create a point for each line not-along the lines

I would like to automatically create a vector of points. The vector should be composed of one point per each line of a line vector (approx 3000 features). Those points should be placed near each ...
1
vote
0answers
22 views

Discrete value extract from raster

I am trying to extract values from a landuse raster layer to a point shapefile. However, when I use either Extract Multi Values to Points or the Extract Values to Points tool, it returns pixel values ...
1
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0answers
46 views

Nearest point does not intersect line in 'sf' R package

This is a similar question to my recent questions on how to find the nearest point along a polyline and how to split a polyline by an intersecting point using only the sf package. My question has ...
0
votes
1answer
36 views

Grouping points into polygons ArcGIS

I am using ArcGIS 10.2.1. I have a set of clustering points. I am trying to create a zone for these points. Is there a tool or script to group the points in an area and convert them to a polygon? I ...
2
votes
4answers
176 views

Find nearest point along polyline using 'sf' package in R

This is a follow-up question related to my earlier post about using the sf package to split polylines using nearby points. I have 450 points with XY coordinates and a large river network (~214,000 ...
0
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1answer
59 views

Accuracy error between Trimble RTK and Juniper Geode GPSS systems

I have set up a system for surveying points with a Juniper Geode GPSS because the survey team is too busy to do it themselves. There is a consistent shift to the northeast of the coordinates I am ...
3
votes
1answer
154 views

Split polyline by point using 'sf' package in R

I'm learning the sf package in R and would like to locate about 450 sites along the nearest reaches of a river network and to obtain the upstream and downstream distances along the reach where the ...
2
votes
1answer
76 views

QGIS 3.2 - Point Sampling Tool error

I am using "Point Sampling Tool" in QGIS 3.2 to obtain values from a raster file to a point layer. After selecting the layer with the points, the values to get values from, and defining the Output ...
7
votes
1answer
47 views

Point pattern gradient fill

I'm trying to create a point pattern gradient fill for some polygons, because I don't want harsh boundaries. The boundaries should blend in with the background. Since I use open streetmap as ...
2
votes
0answers
158 views

Qchainage: python error with QGIS 3.2

I get a following python error while working with QChainage-tool in QGIS 3.2. Because of that (assumably) the OK-button is also greyed out. My goal is to retrieve start and end points of line features....
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0answers
17 views

Ruggedness Index appended to point data [duplicate]

I'm working with two key files, one is a ruggedness Index raster built from a DEM raster file and the other is point data for roughly 100k points. What is the simplest method available using open ...
3
votes
1answer
58 views

Counting occurence of unique points across large grid using QGIS?

I am attempting to map out, in a 10x10 km grid, the occurrence of unique plant species. I have used the "Points in Polygon" feature to count and map the unique points across the grid, however I have a ...
1
vote
2answers
159 views

extract data of polygon shape which intersect with point shape R and create data frame

I want to extract data of a SpatialPolygonsDataFrame li which intersect with the SpatialPointsDataFrame p R and then create a data frame with the coordinates and values of both objects. I tried ...
2
votes
3answers
137 views

Nearest distance from point to pixel in QGIS?

I have 1) a point layer and 2) a binary raster file (1 and 0). I need to estimate the Euclidean distance from each point to the nearest "1" pixel. I know there is a tool in ArcGIS but I only have ...
0
votes
1answer
27 views

Finding output values of point density calculation?

I ran the point density tool and got an output, but because the 'Area Units' option in the Point Density was locked to Square_Map_Units - I don't know how to tell what units the density was calculated ...
4
votes
3answers
323 views

Qgis 3.2 atlas with set of points

I have a shapefile with 100k points. I want to create an atlas that would only show set of points having the same specific attribute. gid;geom;id_coupe;symb 3572;"POINT(1.79008147341714 5.93)";"...
2
votes
1answer
80 views

How to join tables to create a new shapefile in ArcMap?

I'm unsure how to join a table and reference shapefile in order to create a new shapefile. I'm using ArcMap. I made a simplified version example below. I have a shapefile of points (locations where ...
1
vote
1answer
50 views

Adding a point at given lat/long Australia - suspected CRS issues

I am hoping to add a geographical point to a layer in QGIS with a specific latitude and longitude value (from GPS.) I have had no success with a number of methods (trying to edit with Numerical Vertex ...
1
vote
2answers
50 views

How to spatially join attributes of a polygon closest/nearest to a point in QGIS?

this seems like it should be a simple task but so far I've not had any luck. I have a points shapefile (showing where manholes are on public roads), and a polygon shapefile showing where building foot ...
0
votes
0answers
19 views

Point/Feature to Raster-unwanted Grid of missing Data raster Cells-ArcGIS10.5

I tried to convert some point data (points on a regular grid of 100m by 100m) with the Feature to Raster Tool and the Point to Raster Tool (Rastersize of 100m) but in the resulting Rasterfile there is ...
2
votes
2answers
412 views

How do I construct a geometry point in SRID 4326 from lat and long? [duplicate]

I have a geometry(Point,4326) column on my table: CREATE TABLE foo ( geom geometry(Point,4326) ); I want to insert into it. Currently' I am running INSERT INTO foo (geom) VALUES ( ST_GeomFromText(...
2
votes
1answer
81 views

Calculating distances between points for every available point in the dataset

The data of interest: a point vector and a line vector. Both shapefiles, with the line vector acting as the road/motorway. All of the points are along the road so close by. I want to calculate the ...