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

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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
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1answer
33 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 ...
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1answer
26 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 ...
5
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1answer
80 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
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1answer
93 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
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1answer
34 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
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1answer
56 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 ...
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1answer
47 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
24 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 ...
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0answers
33 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. ...
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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 ...
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2answers
54 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
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1answer
100 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 ...
2
votes
1answer
103 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
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1answer
44 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
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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
25 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
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1answer
59 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 ...
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1answer
50 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
49 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 ...
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1answer
100 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
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0answers
87 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
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2answers
159 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 ...
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1answer
59 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 ...
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0answers
57 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 ...
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1answer
44 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 ...
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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 ...
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1answer
70 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 ...
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0answers
16 views

How do I generate a sampling path by numbering points?

I need to number points from left to right and then the next row of points the numbering must continue from right to left, then again from left to right the row thereafter - and so on, and so on. ...
2
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0answers
27 views

Adding attribute data together within multiple polygons in QGIS? [duplicate]

In QGIS I have two vector layers, the first is a set of polygons and the second is a series of points. Each point has a numerical attribute associated with it and is located within one of the ...
3
votes
1answer
73 views

Rotate symbols perpendicular to line angle (QGIS)

I have lines representing curving streams and want to angle symbols at various points on the streams so that they are perpendicular to the angle in their particular locations. What QGIS seems to do ...
2
votes
1answer
74 views

Selecting features of vector layers based on another vector layer using QGIS?

I am using QGIS 2.12.2. I am using three vector layers (point, polyline and polygon shapefiles) of the region of interest. Any advice in making the selections from one dataset based on the other ...
1
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1answer
92 views

How do I assign elevation labels to a custom set of points in QGIS?

Im trying to create topographic surveys using georeferenced images from a drone and a DEM/orthomosaic which has been created using Photoscan. I've managed to create contours and label them with ...
4
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1answer
44 views

Is it possible to locate a specific marker point on a raster using python and use that location for georeferencing

I have several scans of the same map, which I would like to georeference. I can not use arcpy.WarpFromFile_management(...) as the rasters are slightly different due to scanning. Is there a ...
0
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1answer
39 views

Connecting two points in ArcGIS for Desktop?

I have two types of point shapefiles. These two points are linked with another attribute table. Each Point from column A is linked to single/multiple values in column B. Each of these object_IDs have ...
2
votes
1answer
100 views

Trouble adding proportional circles on top of symbolized polygon in ggplot2 map

Data: Zipped ea.ml1 shapefile can be found here, and the country outline can be downloaded here at the GADM site. I've been using the Ethiopia ESRI shapefile. Branch locations are here. Per the ...
1
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1answer
50 views

Connect multiple 2 points with a line in ArcGIS?

I have a table in which each row has two columns representing the objectID of two different point features in the Map. There are thousands of such rows. How do I connect the each of these two points ...
4
votes
2answers
75 views

Add a point on a spplot in R

I have to add a point on a existing spplot in R. I need it only for a visual purpose. I have the coordinates of the point, but I don't know how to change the code in order to add the point. This is ...
0
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1answer
34 views

Snapping point to point nearest to it in ArcGIS for Desktop?

I am using ArcGIS 10.3 for Desktop. I have 2 point features centroid and station. I want to snap all the points of centroid to the nearest point in station such that centroid is only snapped with ...
0
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0answers
157 views

How to add marker dynamically when clicked on map using OpenLayers 3?

I'm trying to add point (marker) on map click with custom style using OpenLayers 3. I tried this code, but nothing happens when user click on the map: var map = new ol.Map({ layers: [ ...
3
votes
1answer
66 views

Is it possible to create points that represent lines in QGIS 2.8.Wien?

I want to create points to represent lines from a line layer. This is similar to creating points to represent polygons. Does anyone have an idea on any useful plugin or the best way to do this?
4
votes
1answer
50 views

PostGIS point distance from polygon not 0 when on edge

I have a pretty simple problem: SELECT * FROM ST_Distance(ST_GeographyFromText('POLYGON((70 -40,70 -39,71 -39,71 -40,70 -40))'), ST_GeographyFromText('POINT(70.48 -39)'), False) returns ...
3
votes
3answers
308 views

How do I plot points as graduated/proportional circles in R?

I'm back again with more R mapping questions! This one is concerning symbolizing points by a certain attribute with graduated/proportional circles. DATA: My full code can be found here if you're ...
3
votes
2answers
76 views

Select point(s) from given coordinate and move to new coordinate using arcpy

Goal: Move address points to their correct location. Plan: I have a layer of AddressPoints of which some need moved to a new location. I want to take a line layer (called ...
3
votes
1answer
84 views

QGIS 2.12.1 - Problem with Size Assistant in „data defined override“ Button - Error message

While trying out the Size Assistant feature I encountered a problem. I´m working with this csv Table: I tried to resize the Point Size based on the field „Anzahl Objk“ and to do this I went to ...
2
votes
1answer
59 views

Complex polyline traversing with searchcursor

I have a very specific question about searchcursor traversing complex polyline. My setup is: I imported public transport routes as a single polyline with length in meters. Along this polyline I want ...
8
votes
1answer
65 views

How can I export a list of points as a matrix in ArcGIS 10.0?

I have a grid made of points (see attachment) with values for altitude extracted from a DEM. I need to export these values not as list, but as a matrix of size 50x50 to be read in SciLab. The grid is ...
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2answers
52 views

Creating new feature class based on x- and y- coordinates?

I need to create a new feature class with four different points on it from various x- and y- coordinates. What is the easiest way to do this? Step-by-step instructions would be helpful. I should ...
3
votes
2answers
81 views

Styling point displacement for 2 variables QGIS?

I have a dataset with multiple sampling events that I want to style by season (or "temporada" in my attribute table) and "EP Chinook". Data is from a csv file. I styled with point displacement to ...