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

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1answer
132 views

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

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 ...
4
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0answers
58 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
104 views

How to map flood areas from a set of points containing surface and height of water?

I am working on the damages made by the typhoon Haiyan. I use QGIS 2.0 with extensions and toolbox, and MapInfo. I have vectors, rasters of the place. I want to map the flood area along the ...
3
votes
1answer
19 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 ...
0
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1answer
228 views

Get points along a polyline at defined distance c#

I need to store into my array the points along the polyline at each defined distance. Example: The Polyline length is 50m, I set the interval to 5m. I have to store in the array all the points along ...
4
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3answers
2k 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
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0answers
16 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
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1answer
46 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 ...
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2answers
6k 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
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2answers
63 views

Get feature from list

I've done this: while (feature != null) { if ((feature.get_Value(feature.Fields.FindField("NAME")) != null) && ...
1
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1answer
32 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 ...
4
votes
1answer
71 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
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1answer
100 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 ...
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0answers
11 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
2k 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 ...
2
votes
1answer
319 views

Postgis 1.4 - Obtain closest point of point over polylines layer (without st_ClosestPoint)

I´ve got a polylines layer (pipes) and a points layer (valves) and In Postgis 1.4 I would like to obtain the closest points but exactly on the closest polyline. In other words, i need to locate each ...
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0answers
23 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?
2
votes
3answers
313 views

Draw line between points from multiple datasets

I have 2 point datasets and want a tool or script to draw a line between all points in one dataset to all the points in the 2nd dataset. Is it possible? I have tried ESRI "Point Distance" and ...
1
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1answer
30 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 ...
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2answers
197 views

How to extend polylines to the nearest point

Hi could anyone tell me a way of getting my polylines to search for a point within a certain number of meters of their start/end points and extend to it? edit: There was some broblem uploading a ...
5
votes
1answer
262 views

QGis 1.8 fails to rotate point geometries with rule-based style

I have to do some visualizations in QGIS (1.8.0) and up to now I've been very happy with the new Dialog "Layer Properties -> Style", using the rotation-field to rotate Point-Geometries visualized by a ...
0
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2answers
66 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 ...
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vote
1answer
37 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 ...
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1answer
35 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 ...
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2answers
52 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 ...
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1answer
36 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 ...
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1answer
1k 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
93 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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0answers
35 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 ...
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0answers
19 views

“Points To Raster Tool”- Output pixel values differ from original point values

I am trying to convert an evenly spaced set of points to a raster using the "Points To Raster" tool in 10.1. Problem: Generally, the raster makes sense, but in some areas the cell values differ quite ...
4
votes
2answers
136 views

How to draw points around a circle in QGIS?

I've got a square origin-destination matrix with 23 elements, I would like to draw each one of these elements as a point around a circle, to achieve a result like the following: Can you suggest me a ...
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0answers
33 views

How can I find which point is furthest from something?

Here is an example of what I am looking to do: Which town in South Dakota is farthest from a Hospital? Which tool would I use to be able to do this?
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1answer
20 views

Accessibility indication from points

I will simplify my question to be better understood. Let's suppose my study area is consisted by settlements A and B. They both have the same population (1000 people each). Each settlement was ...
0
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1answer
51 views

arrow-symbols won't rotate

I created my own marker symbols (arrows) for point features. Now I want to rotate them with the Rotation-Tool from the Editor-Toolbar, but the Arrows always snap back to their original horizontal ...
3
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0answers
14 views

Action: Move pointfeature to other layer - Point becomes Multipoint

I'm trying to write an action that moves a pointfeature from one layer to another. It works fine until i try to save the layer with the new feature on. He says he can't save a MULTIPOINT to a ...
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vote
2answers
130 views

How to create a series of points along multiple polylines at once in ArcMap 10

I have a series of polylines that represent linear vegetation (shelterbelts, etc). I need to convert these to a series of points equally spaced in order to add them to a different shapefile that ...
0
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2answers
273 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
1answer
100 views

Getting feature at point in C#

I want to get the feature at where mouse was clicked in map. So I was wondering how to get features which intersects with that point. Plus I was wondering how can I check what type of object it is ...
1
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1answer
41 views

Select points with lowest elevations and same x,y coordinates

The problem is as following, I have a point layer with x,y,z coordinates. Some of the points have same x,y but different z. I need to separate points without duplicates (x,y) and in case there are ...
1
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1answer
375 views

Split a line feature using nearby points

I have a line shapefile and a point shapefile, and the line has its own segments and its attribute table, the point shapefile has points near the line above, not on it and the close ...
1
vote
1answer
50 views

QGIS PointConnector Plugin - x out of x lines not drawn

Unfortunately every try to generate lines between points (.shp) with ids (1-6) and a csv-file with from - to values failed. Maybe you can give me a hint whats wrong with my workflow? 1) I generated a ...
2
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0answers
42 views

How to Interpolate very large datasets in QGIS?

I am working with a very large set of point data, (XYAttribute) which I wish to display as a raster. I've been using Interpolate, this is successful but very slow. I have other programmes that ...
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0answers
92 views

Spatially join points to polygons in ArcGIS Desktop? [duplicate]

I am trying to join a point feature class to a gridded polygon feature class in arcGIS so that all the points are matched to the grid cell that they fall within. I would like to end up with an ...
1
vote
1answer
34 views

QGIS 2.4: copying of points to another point layer

in QGIS 2.4 it is not possible any more to copy points of a layer into another layer - I get the message: " Fehler: Objektschreibfehler: Objekterzeugungsfehler (OGR-Fehler: Attempt to write non-point ...
3
votes
0answers
54 views

Geoprocessing tool for finding specific point within polygon

I have a ArcGIS task and cannot find a solution. I try to find a certain point within a polygon (see picture). This example is handmade and I need a geoprocessing solution I point I try to get is ...
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0answers
41 views

Invalid join selectivity error in postgis 2.1.3

I have 2 tables, one for points and one for polygons. I want to find points falling within theese polygons, so I quered: select p.id, l.id from points p inner join polys l on st_contains(l.geom, ...
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1answer
50 views

How to transpose data points to a line efficiently?

See sketch below. The main objective, using ArcGIS 10 or 10.1, is to get the P points to the perpendicular P line and, either the closest B point to the endpoint of the P line where it interesects ...
2
votes
1answer
39 views

Arcpy PointGeometry does not carry forward the ID

I used this as starting point I have the following code: Test data data = numpy.array([(0, 51.1047664, -114.3722785, 1205, ...
3
votes
1answer
126 views

How to create a cluster of crashes?

I have a shapefile with 52K points of road accidents, between 2007 and 2012. Each accident has a severity index. I want show clusters of 5 accidents (at least), for each year, that have a severity ...