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

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2
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1answer
92 views

Distance to nearest point for every point same SpatialPointsDataFrame in R

I have a SpatialPointsDataFrame that I'm working with in R. I want to add a new vector to the dataframe that contains, for every point, the distance to the nearest other point in the ...
2
votes
2answers
275 views

How to count point shp inside polygon shp using Python?

This is my first time here, so I'll try to be as specific as I can. What I'm trying to do is found out which polygon contains the most points and write the result in a text file. Here is my script : ...
0
votes
2answers
51 views

distance between paired points in separate shapefiles (paired by attribute data)

I have a point layer with site_code attribute data. I have another layer of points in different locations but with the same site_code data. How can I find the linear distance between points that are ...
0
votes
0answers
12 views

How to equally space points in a line using QGIS? [duplicate]

How do you place points in a straight line the same distance from each other in QGIS? Thanks
1
vote
2answers
53 views

postgis - get nth point of a polygon

I would like to create a postgresql function to correct geographic coordinates inside a polygon that are outside the -180 to 180 range of longitudes. To do this, I thought I would create a function ...
1
vote
2answers
64 views

how can we save vector layer as a file in openlayers

Im using mapserver + openlayer for GIS API and im new to GIS. I'm done with drawing line, point and polygon features in openlayer. but not being able to save it in some shapefile afterwards i got to ...
1
vote
3answers
342 views

Create multi-line from point in PostGIS

I'm working on an old table where polygons are stored as points. Now, I want to migrate these points to PostGIS and store them as polygons (or multi-polygons). The table structure is as follows: ...
4
votes
3answers
2k views

Comparing two point shapefiles that contain lat/longs and compute distance using ArcGIS Desktop?

I have 2 sets of point shapefiles in ArcGIS Desktop (group A and B), each set has around 1000 entries that contain lat/long. What I want to do is compare Group A against Group B and figure out for ...
2
votes
1answer
57 views

Split point shapefile by date attribute using ArcGIS for Desktop?

I have a point shapefile composed of points created on a Garmin in 2012 and 2013. They are in the format mm/dd/yyyy (there are other fields, but this is the one of interest). I was wondering if ...
1
vote
1answer
177 views

postgis calculate distance between point & polygon/circle

By basic requirement is to find the nearby fences to a particular point(user lat long alt) within a N meters. I have list of polygon/circle in DB with 900913 srid ...
0
votes
0answers
35 views

Parameters for CreateFishnet

I´m about to create a fishnet. The CreateFishnet tool has several parameters, between them the origin_coord - The starting pivot point of the fishnetl. Data type of this parameter is Point Now there ...
8
votes
5answers
8k views

How do I convert a Polygon into a single or all Points?

I want to convert polygons into points. I know how it's done in ArcGis and I think this may sound trivial but it's a serious issue :/. I'll appreciate any hints :)
0
votes
1answer
402 views

The best way to convert points to polygons using ArcObjects

I have a set of points from GPS I want to convert them to polygons..I have two approaches to do this.1- convert points to polygon..I do this with below code: private IPolygon ...
1
vote
1answer
123 views

Convert polygon to point with QGIS [duplicate]

I work with QGIS and I tried to convert polygon into point. I need points all over the perimeter of the polygon. I saw several answers like: Problems converting polygon to point but I didn't see an ...
1
vote
2answers
217 views

Vector -> Geometry Tools -> Extract Nodes equivalent in PyQGIS API

My question is fairly straight-forward. Would anyone know the PyQGIS equivalent of the Extract Nodes tool in QGIS? I don't seem to find it in the API documentation. If you do, kindly share the ...
2
votes
1answer
2k views

Is it possible to place a point at a coordinate in QGIS?

Is it possible to place a point at a coordinate in qgis? I have a map, using irish grid reference and wish to place a point at an exact 6 digit coordinate. Is it possible to do it. Previous to this ...
1
vote
2answers
53 views

Re-numbering points along a polyline

Using ArcGIS 10.1 for Desktop. I created perpendicular lines along a polyline. In the process of doing that, the lines were numbered in order (automatically). I manually edited some of the ...
1
vote
1answer
22 views

Join nearest points from 3 differentfeatures in ArcGIS 10.2

I have 3 point features. This points represent middle of tree trunks with attribute of diameter. The reason I have 3 features is that I used 3 algorithms how to calculate diameter. Now I need to join ...
5
votes
1answer
409 views

How to connect particular sets of points with (poly)lines?

I think my problem is quite easy to be solved by the most postgis-users, but i am a bloody beginner: i have a timestamped point-table representing GPS-tracked places of different cars. To distinguish ...
2
votes
1answer
1k views

PostGIS, create line from points

I have a PostGIS table with position data of numerous vehicles and want to create lines from these points. Data can be selected by vehicle id and ordered by timestamp but how to create lines from the ...
3
votes
1answer
178 views

How to convert a line to points?

I'm working with QGIS and I want to convert a line into many points, does someone know how? Thanks.
8
votes
4answers
6k views

Get all the points of a polyline

I have some polyline feature objects in python. Now I want to get all the points of polylines. For example, if a polyline has start point [0,0] end point [5,5]. Result: ...
3
votes
1answer
2k views

convert list of points to line or polygon

I have a list of Points in a PostGIS table. The rows can be grouped by a date something like: myTable id INT date DATE lat NUMBER lng NUMBER geom GEOMETRY(POINT) now I need a table where all ...
1
vote
1answer
2k views

Converting Points to Lines in ArcGIS AND retaining attributes of both start and end points

I have been searching and searching and I can't find a particular solution to what I need. I have a table with animal location points. I need to calculate movement distances between points from the ...
5
votes
1answer
3k views

Draw lines from points in QGIS

(I found here similar questions but they all reffer to ESRI's programs, and I use QGIS) I have a point layer and need to draw a line passing through or in the vicinity of the points (up to 0.5m ...
0
votes
1answer
153 views

Generating points from chainage and offset

I have a polyline layer and an external csv containing road sign data. The csv has unique ID of the polyline, chainage along each unique segment and an offset. I have access to ArcGIS, MapInfo and ...
6
votes
1answer
668 views

Interpolation: irregular shape, merging DEM's

My problem is quite complex, but I hope that solution may be simple or at least possible. I do have .img DEM 0.5x0.5m. DEM consists of river bed, river valley and adjacent areas (it is strip of 5km ...
1
vote
1answer
161 views

QGIS how to compute a trendline of two point lines? [closed]

Does anyone know how to compute a trendline for two lines of points? I have two lines of points of a 10 km long urban road. 1st line is one driving direction and the 2nd line of points ist the other ...
5
votes
0answers
89 views

Point sampling along a pole-wrapping coastline with PostGIS

I am working on a task that requires me to get sample points every 1000KM along coastlines, and have run into a problem with Antarctica. From what I can tell, it seems to be an issue with the use of ...
3
votes
1answer
169 views

Leaflet: Change point icon (geoJSON) on click and change back when clicking another point

I would be very grateful if someone could help me with this. I have a geoJSON (10 points) that is drawn using an icon. I want to change the icon when I click on one of the points and then I want to ...
5
votes
3answers
3k views

How to extract POINT from a [LINE|MULTILINE]STRING

I'd like to create a vectorLayer in QGIS to display all the points that form a LINESTRING or a MULTILINESTRING stored in a PostGIS DB. I think that I need to transform all points of LINESTRING (or ...
2
votes
0answers
135 views

Get Distance between two point on linestring using mysql Spatial

I have a linestring and two point on this linestrin according to my picture i want distance between two point as base of linestring please hellp me
0
votes
1answer
71 views

GRASS GIS v.in.ply

I'm trying to import a .ply file from MeshLab 1.33 into GRASS GIS 7.0 using v.in.ply addon, but I get the error message: ERROR: List index must be integer, is uchar This appears to be referring to ...
5
votes
2answers
7k views

How to calculate new point coordinates from distance and angle using ArcGIS SDK for iOS?

I want to calculate the coordinates of a new point. What I have: The source point coordinates, the distance (meters) and the angle For example: I want to create a point within 100 meters and 45 ...
2
votes
2answers
73 views

Get feature from list

I've done this: while (feature != null) { if ((feature.get_Value(feature.Fields.FindField("NAME")) != null) && ...
1
vote
1answer
116 views

How to find a point on linestring and in a range of 10 meter

i have a linestring which is show in diagram and i have a point which is some time on the linestring or out of linestring but in range which is red line and some time its is out of range so how can i ...
5
votes
1answer
111 views

How to connect centroids of lines sharing the same intersection in QGIS?

I'm looking for a big help to accomplish the following task: I have this street network of the center of Turin (IT), composed by lines representing streets, and black points representing ...
0
votes
0answers
12 views

Pavement survey implementation

I know I am supposed to be specific...BUT I am working as part of a research team on pavement study. I need to visually display survey data in Arcmap. The surveys consist of x transverse ...
4
votes
2answers
3k views

Compute Angle of line in conventional bearing using ArcGIS API for JavaScript?

I am trying to compute angle between two lines (line segment) using ESRI (ArcGIS, JS) in conventional bearing (Eg: N29'E) I am using Add Toolbar to draw a line segment where point A is a fixed point ...
0
votes
0answers
95 views

How to convert geometric point to geographic point in SQL Server?

I am new to sql geometric and geographic types What I need is a way to convert a sql table of geometric points into geographic points?
1
vote
1answer
39 views

Visualisation of “dominant” point in each location

I had an idea for a kind of visualisation, and I'd like to know if it's been done before, what it's called etc. Basically it would visualise a single numerical quantity that varies greatly, at ...
0
votes
2answers
79 views

Spatial join with snapping

is there a tool in QGIS which is able to perform a spatial join with the possibility of define a snapping radius? For better understanding: I have 2 point shapes with attributes I need to join by ...
1
vote
1answer
45 views

Creating random location within a network from a given location and a given distance

For a habitat selection study, I am trying to identify availability. My species lives along waterbodies and I could assess distances moved between two consecutive locations using the network analyst ...
0
votes
1answer
112 views

Is it possible to join points to a polygon in MapInfo Professional v10.0?

This is what I have... ... and I would like to assign the points to the polygons that they belong to. In ArcGIS this is accomplished fairly easy through using Spatial Join, but I have no clue how ...
1
vote
2answers
77 views

Calculate nearest feature with a barrier

I have three shapefiles: a) polyline with rivers and streams (also as polygon available to me), b) polylines of highways and roads and c) point file with locations in the riparian vegetation. I want ...
1
vote
1answer
69 views

Python-Scripting in ArcGIS: Point as Input?

Is there any possibility to add a Point-Feature as an input parameter in a ArcPy-/ArcGIS-Python-script? If I choose "Point" as datatype in the parameter list, I get 2 input-fields for a X- and a ...
3
votes
1answer
2k views

Arcgis Javascript latitude and longitude convert to WGS_1984_UTM_Zone_36N

I am using Arcgis Javascript api. I have two points comes from Google maps like this x:-111.67095840000002 y: 32.7558935 I wanna use this points on my Arcgis map. My map spatial reference is using ...
2
votes
3answers
373 views

ST_MakePoint or ST_PointFromText to generate points

I'm new to postGIS and am having trouble finding an answer to this question. I have loaded UK postcode data (OSGB36, SRID 27700 with eastings and northings fields) into a postGIS database. I now want ...
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vote
0answers
38 views

River flow downhill

I have polylines (rivers) with assigned elevations. I need to ensure they are flowing downstream and indicate which vertices are incorrect. I do not have 3D analyst, spatial analyst, or network ...
4
votes
3answers
1k views

Problem creating a point IFeatureClass

I'm trying to create a point IFeatureClass, but my code doesn't work. Public Function CreatePointFeatureClass(ByVal featureClassName As String, _ ByVal ...