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

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1answer
63 views

orthogonal projection of a point onto linestring in PostGIS

I am trying to find the orthogonal projection of a Point (in 4326 SRID) onto a LineString (in 4326). The picture shows the objective. I have tried to use ST_Distance function, but in this case the ...
2
votes
1answer
54 views

Trying to make many polygons from points? [closed]

I am trying to turns points into polygons, but I encounter this challenge : My data set has 1000 entries. Each entry has 360 associated columns, each with a coordinate pair. When connected, these ...
3
votes
1answer
60 views

Point-to-point Link

I have a point layer of 64 points. Now I want a point-to-point linkage line layer containing 64*64=4096 lines. Is there a way automatically do that?
1
vote
1answer
37 views

Point coordinate shift after python toolbox processing

I am working on custom clustering in ArcMap. For it I have created a python toolbox, where I do the processing. However, as a result I get slightly shifted points (6-20 meters), while they shall stay ...
1
vote
0answers
19 views

Create pointe layer with table [duplicate]

I have a table with 13,000 points of geographic coordinates ( degrees, minutes , seconds) How I can create a layer of points ? QGIS or Arcgis . it is possible to create a layer of points with ...
7
votes
2answers
94 views

creating clusters of points with same attributes

I have a file of some 4000 points, which belong to around 400 different categories (species of rare plants). I would like to remove duplicates within the categories (which could be repeated ...
2
votes
1answer
30 views

Point-Line shortest distance and corresponding angle using FME

I want to determine the shortest distance and especially the corresponding angle from a point to a polyline. A solution using FME would be strongly preferred.
2
votes
0answers
42 views

Shortest path tool failed in QGIS

I'm trying to find the shortest path between two points (green and red points) on a road layer using QGIS 2.12.3. The roads layer has appropriate CRS. Before sign the "start" and "end" points I ...
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1answer
23 views

Creating points with co-ordinates in QGIS to upload to GPS

I have generated a random point within a set area. I have done this using the Google Maps plugin layer. The CRS is set to WGS 84. I want to get the co-ordinates for this point so I went into the ...
2
votes
1answer
42 views

Correlation of yield data within a buffer zone

Working with QGIS 2.12.1-Lyon, I am trying to compare one point (single shape file) with multiple others that fall within a buffer zone of 10m i.e. comparing one shape file with another. The end ...
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0answers
31 views

Creating Point Grid over selected polygon using OpenLayers 3?

I am trying to create an equally spaced grid of points. But these points must only be on land. I was using the polygon overlay of countries to see if I can use that as a mask. I have also tried ...
2
votes
0answers
61 views

Measure distance between points along a line in QGIS

I have a road network and different points connected to the roads. I would like to measure the distance between several points along the roads. Basically I want to do the same like the road graph ...
2
votes
1answer
13 views

How to extract values from multiple raster dataset from a location point in one single dbf?

Suppose I have 250 raster and my only concern is just a single point. The raster is arranged by ascending date. So if I extract a point value based on the order into one single file then I can graph ...
0
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0answers
31 views

many points to many line segments - and retain attributes of points

I would like to take a feature class of 22571 points (with time (in seconds), lat/lon and various other attributes but for now I care most about the ON/OFF attribute) and connect those points into a ...
0
votes
0answers
23 views

How do I reassign a point's XY value in ArcMap 9.3?`

I have a rectangle polygon I drew on a map and then added points to it's corner and midpoint. I drew the shape (representing a forest sample plot) where I thought it was best located based on 70 year ...
2
votes
2answers
36 views

Interpolation of point data with different scope

I need to interpolate a raster from point data (air pollution stations data). What I want to achieve is to distinguish the station's scope (or range or scale). For example some station's data are ...
3
votes
0answers
37 views

How to move a point on a touch screen using esri map, dojo and javascript

I am new to map development. For touch screen devices, I need to add a point on an ESRI map and then move this point to other location on the map and get its coordinates.
1
vote
2answers
92 views

Rotate symbols perpendicular to line angle (ArcGIS)

I have lines representing curving streams (blue line in the Picture) and want to angle symbols perpendicular to the angle in their particular Locations (point features symbolized as red lines in the ...
2
votes
3answers
64 views

How do I create random points only within a multi-part polygon and none outside?

I am currently using a shapefile consisting of an area smaller than the entire study boundary ie. I want this to to be my overall study area. I used a raster to polygon tool and converted it to a ...
1
vote
1answer
50 views

Create fishnet only where cells overlay point feature using ArcGIS for Desktop?

Is there a way to create a fishnet where cells are only generated where they would overlap a point feature in ArcMap 10.3?
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0answers
28 views

How to assign a grid of point data to corresponding grid of polygons

I'm using QGIS 2/12.3 I have a point layer with modelled data on a 1km grid, each point has a value (0-5, modelling temperatures) and lies at the centre point of a 1km grid square. I also have a ...
0
votes
0answers
17 views

Create Point Layer from Raster [duplicate]

How would I create an evenly spread Point layer (Qgis), where each Point is located in the middle of a raster cell from a given raster layer?
4
votes
1answer
46 views

tweepy psycopg2 creating points, coordinate system SRID confusing

I am using tweepy and psycopg2 to extract tweets and input them in a postgres table. When I try to insert the point of the tweet I succeed in creating a point in the geom column I create. I however do ...
1
vote
1answer
30 views

Make given number of points at evenly spaced on line in QGIS?

I have a shapefile lines representing historical flight paths of aerial photography. I have the number of photos taken for each path and the number of the first and last photo, plus the ID of the ...
6
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1answer
87 views

Categorising Point Clusters

I have a point dataset of solar farm locations. The points are grouped according to which substation they feed into (see below). I would like to test the hypothesis that electrical output ...
3
votes
1answer
108 views

Nearest distance between point layer and line layer, QGIS

I have two layers , line and point layer. I need to make line layer which connect all points to nearest line features? Is someone made a plugin for qgis? This is very important tool which missing in ...
2
votes
1answer
38 views

Calculating distance between points from table of UIDs [ArcMap]

I have a .dbf file containing pairs of point feature Unique Identifiers (UIDs), and need to calculate the straight-line distance between each of these pairs. The XY coordinates of the individual ...
2
votes
1answer
57 views

Selecting many maximum points within polygons

I've got a point layer with three values such as high, age etc. and polygon layer with many forest area. What I want to do is to select the 100 maximum (highest) points in every polygon. I can't do ...
2
votes
2answers
66 views

ArcGIS - Locate features along routes returning double results?

I am using locate features long routes using a points layer and a routed polyline network. Each point has a unique ID. My end goal is to determine is a point is to the left or right of the line. ...
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0answers
26 views

Build network based on shortest distance between points

Is there a way to build a network based on the shortest distances between each point of a point layer. I have occurrence data from species (as points) and want to estimate whether there are one or ...
1
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0answers
34 views

Create Point - measure distance to point layer- accounting for terrain [closed]

How can I - select a point / location- they pass us a location, that will be a point from one of a series of preexisting layers (which may include lat long or mailing address, but not generally. ...
0
votes
0answers
14 views

How do you add an image to a point location in ArcGIS 10.3?

I have a set of point locations (groundwater wells) and a graph of groundwater elevation for each location. Is there a way to show the graphs at their respective locations on the map, without having ...
1
vote
2answers
57 views

Changing point data coordinate system without moving points in QGIS?

I made a mistake regarding coordinate systems and lining up two layers. I have a raster with elevations in EPSG:2949. I created a point data shapefile and entered about 600 hundred points manually ...
6
votes
1answer
120 views

How to group 10k points into closest pairs?

I was first faced with a problem of grouping 1000 pairs into unique pairs to minimise the total distance - since this was a small number I solved it using linear optimisation: Part 1 - Basic/Naive ...
2
votes
1answer
50 views

Polygon data to Point Feature Data

Using ArcGis 10.0. What I am looking for is a way to get point features that are placed in a polygon to have the same "Address" value. This is the same as the "Spatial Join" feature, however, I am ...
3
votes
1answer
122 views

PostGIS convert point->raster->GeoJSON

My question is a follow up to Convert a raster to GeoJSON polygons in PostGIS. I'm trying to accomplish querying point data from the database, and then turn that into a raster for calculating ...
1
vote
1answer
50 views

Correct Projection for calculating centroids of a group of points?

I have a long list of points covering all of North America for which I would like to calculate the centroid (by grouping points based on the "Name" column). My approach is to take the WGS84 ...
0
votes
2answers
45 views

remove certain points from point shape file

I have a point shape files with 9674 points.The attribute column has three fields: X, Y and value. Out of these 9674 points, I want to remove 1700 points based on X and Y values (I know the X and Y of ...
1
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0answers
29 views

Colliding labels for point features in QGIS

I have a layer (point features) containing various points of interest (POIs), some of them have the exact same location. I would like to map these POIs and add a label showing their names. However, ...
2
votes
1answer
60 views

How to create azimuth raster layer by pyqgis?

I want to create an azimuth raster layer base of single point shapefile, for this I write below code that create a memory point layer that each point in memory layer is center of each pixel and have a ...
0
votes
1answer
54 views

Select by Location using first points of polyline

I am trying to select a point from a point layer that intersect a polyline layers firstpoint and using arcpy. I am getting an error "ExecuteError: ERROR 000622: Failed to execute (Select Layer By ...
3
votes
1answer
60 views

Adding hover pop-up notes to map Arcmap desktop 10.3

I have a layer of points defining a variety of geologic features overlying a global map. I would like the user to be able to hover over a point and see a description of that feature. Hyperlinks ...
1
vote
1answer
138 views

Error when trying to plot legend for geom_point with ggplot2

Here's some mock code to go along with my problem: #read in libraries library(ggmap) library(sp) library(raster) library(ggplot2) #read in country shapefile, project, fortify for mapping with ...
2
votes
0answers
102 views

“Geometry cannot have Z values” exception in ArcGIS Engine

I'm trying to put a list of point features (selected points) into a new FeatureClass. but when I add them to my FeatureClass I get the "Geometry cannot have Z values." exception on the line ...
6
votes
2answers
164 views

How to speed up this script in QGIS?

I am a new in PyQGIS, I want to create a Point layer from a raster layer. In table of point layer created, there is 3 fields by name of "X_coord", "Y_coord" and "Azimuth", each point in Point layer ...
1
vote
1answer
72 views

GeoDjango - save two Point fields, one for geography and one for geometry

Most of the explanations I've read for geography and geometry seem to suggest that one must only use either geometry or geography, and that the only way to use both is to cast/convert between one and ...
0
votes
0answers
66 views

GeoServer SLD Filter rule before PointStacker transformation

I'm trying to apply a filter rule in an SLD, before applying the GeoServer PointStacker transformation (which groups points that are too close to distinguish their icons). This transformation is ...
0
votes
1answer
53 views

Changing default point symbol?

I am trying to change the default point layer symbol to a set one. For example I have a fire hydrant point layer that is represented by a default point symbol when I import it into my map. Is there ...
0
votes
0answers
3 views

Retaining Raster Point Data Using wms [duplicate]

I have a single band raster being served via geoserver wms. When I view the raster through geoservers built in openlayers viewer I get different point value results than if I ask geoserver for a ...
1
vote
1answer
85 views

Finding and merging lines that touch in PostGIS?

I would like to select and merge segments that touch like in the image below. My table contains single segments with their own id (shown in the figure), I just want to isolate single "group" of ...