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

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10 views

Defining and exporting a path from discrete points in QGIS

I'm working with elevation data (NED, SRTM, etc.) in QGIS and I'm wondering how I might be able to pick a set of points from my map and export the coordinates to something like CSV. For example, I'd ...
3
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1answer
20 views

How to find all points with certain elevation difference between them in QGIS

I have a point layer (xyz) and want to find all points that have elevation difference of 200m or more. I would like to then draw a line between each pair with the largest elevation difference. The ...
0
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0answers
9 views

How to group points based of user-provided distance in ArcGIS

I have a point layer and I need to group/aggregate the points within a 1km proximity into 1 single point to create a new point layer. I was trying to use Aggregate point and then Feature to point, ...
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2answers
28 views

Changing sequence of point features into order along line using ArcPy?

The picture below shows that the order of attribute record for point features is different to their actually distributed location. How can I change or sort the attribute records into a proper order ...
3
votes
1answer
181 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 ...
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1answer
26 views

'Capturing' Polygon Surrounding a Point [on hold]

I am attempting to 'capture' multiple polygons that are associated with points. I am attempting a create a shapefile layer with all of the taxlots associated with an entity. The problem is that the ...
5
votes
1answer
908 views

Converting labels to points using ArcGIS Desktop?

is there a way to convert labels, created by Maplex labeling engine to point features? In MapInfo and CAD software, it's possible to convert labels to points. Those point features include a text and ...
2
votes
1answer
417 views

How to obtain closest point of point over polylines layer in PostGIS 1.4 (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 ...
2
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1answer
36 views

How to detect if point is on the left or right side of the line in PostGIS

I have a linestring table and a point table in postgis. I know the closest line to any given point. What I need to know is on which "side" of that line is the point. I guess I have to do that by ...
2
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1answer
29 views

Automating Line Creation with Multiple Points

I have a feature class that has over 1500 points in it. I then need to create line segments from these points based on an ID number. For example points 1-6 have the ID 1, points 7-12 ID 2 etc. Each ...
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0answers
10 views

Django Postgis Distance from point

I have a point where the objcet is and another point for mylocation. I want to calculate the distance >> object_location <Point object at 0x7f9ceaac7be0> >> mylocation <Point ...
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3answers
582 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 ...
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vote
1answer
299 views

How to generate random points with minimum distances between points in multiple polygons

I am looking to create random points for a random stratified survey. There are three different categories being surveyed; for each, I have a single shapefile, each containing a number of polygons. I ...
4
votes
2answers
200 views

Boundary from Points

I have a point cloud and need to process a very detailed boundary around the outer points. Is there a tool in QGIS? Convex hull is not detailed enough. Thank you!
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0answers
20 views

Error in Editing Point Shapefile: I can't add a new point feature

I want to add a point to a point shapefile. I place the cursor in an empty field. The strange thing is that the point of the point shapefile that is nearest to the cursor is highlighted. If I click ...
0
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1answer
34 views

Calculate distance between two coordinates along lines

I have a map with two layers: a map of the streets of Montevideo, and a map of shops with the lat long location. I would like to calculate the distance between each shop and the nearest one, along the ...
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0answers
21 views

Making raster from vector

Have you ever met with nan value in raster? Im making raster in qgis from vector (one point) and all I have got is nan value and black raster.
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2answers
640 views

How to create polyline feature from two input points by following/tracing another polyline?

I have a list of things each have two grid references, start and stop points. I can turn these into points and join them with polylines. But what I need to do is have the lines that join the points ...
0
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1answer
20 views

How can i highlight a point using arcgis api for javascript?

How can i highlight a point using arcgis api for javascript? When i use the function of centerAndZoom ,I also want to highlight this point,how can i do?
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0answers
44 views

GeoSever PointStacker Renders incorrect position

I've been trying the GeoServer Rendering Transformations - Point Stacker. According to this docs there's an optional cellSize parameter for setting the "Size of the cells in which to aggregate points, ...
2
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4answers
83 views

Export ground returns (.las) from classified point cloud

I have lidar data that is classified as several categories (water, ground etc.). I need to open this lidar data in some software (it will be great if it would be a open source software) and delete a ...
1
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2answers
1k views

Creating density map from point data?

I have point data, where one point represents one 1 storm water outfall, looks like this: (point data is across all of Long Island, New York). I am having a bit of difficulty finding the best tool ...
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0answers
28 views

Assigning Raster Cell data to Point data

I have 23 sets of raster data for different types of habitat (which I have performed Block Statistics on in Arc10.2, in order to create a 1km grid). I also have 5 different Sets of point data showing ...
0
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1answer
62 views

How to create soil-type maps using QGIS

I am trying to create a soil-type map of an area from point data using QGIS. I tried interpolating the data, since soil is continuous. I did this by allocating a number to each point type and then ...
2
votes
2answers
3k views

PostGIS convert geography(Point,4326) to GPS

I got a database with a column of type geography(Point,4326), the data contained looks like 0101000020E610000092E057F66EF73140930035B56CBD4840. How can I convert it to GPS coordinates?
5
votes
1answer
336 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 ...
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116 views

Point sampling along a pole-wrapping coastline with PostGIS

I am working on a task that requires me to get sample points every 1000 km 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 ...
0
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1answer
15 views

Assigning an NTA code to a point feature class from a polygon feature class

I have a point feature class and a polygon feature class (NTA - Neighborhood Tabulation Areas). I want to assign each record in the point feature class an NTA that it falls into. Also, neither of ...
3
votes
0answers
33 views

Extract the outer points of a Point Shape into a Line Shape? [duplicate]

I've installed QGIS 2.8.2 since a few days and have no experience with this application. I try to extract the outer points of a Point Shape into a Line Shape, like a shell for the inner points. All ...
2
votes
1answer
69 views

Standalone Python script to split a polyline with a point layer

I have a polyline layer and a layer of points that are on top of the polylines. I do not have the ArcGis advanced license so I can't use the Split Line at Point tool. Can someone help me with a ...
3
votes
3answers
128 views

Spacing a set of points

I have a shapefile of a set of points that I want to space out. I DO NOT want to do this using line interpolation as I run the risk of placing a point where there wasn't one before. I can load this ...
4
votes
1answer
50 views

How to find the distance from a point to a polygon, via another point, in R

I am trying to calculate the distances between a central point, and the edge of a polygon, along straight lines drawn between the central point and another set of points (where necessary extended ...
5
votes
1answer
1k views

How to automate the drawing of polygons (square) around a number of points in QGIS?

In QGIS (or alternatively any other scripting + GIS stack), how can I automate drawing a 100km x 100km square around a number of points, with the point being dead in the center? I'd need to loop ...
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2answers
276 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 ...
1
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0answers
60 views

ArcMap Point Distance giving decimal degrees even when in projected coordinate system

I'm trying to calculate pairwise river distance among 60 XY coordinates in a small region of Mexico with ArcMap 10.2.2. I have defined my projections and projected both my stream network and XY ...
1
vote
2answers
4k views

How to find nearest point for each point in current layer using ArcGIS Desktop?

I have a point layer and want to know the distance of nearest point of current layer for each point in the layer. I found some tools in ArcToolbox about it , but they need two layers for input and ...
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1answer
69 views

finding the nearest point along the edge of a polygon

I have a polygon shapefile which represents a study area (island). I also have a point shapefile representing some villages. What I am after is to locate for each village point the nearest point along ...
5
votes
2answers
562 views

Rapid digitizing of Point Data using ArcGIS Desktop?

I have several big maps with a lot of points that I have to digitize. All these Points have different Values (depth in Meter, double) and will be stored in 1 Shapefile. Is there a way to speed up my ...
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0answers
32 views

Getfeatureinfo is not working with geoserver point line sources

I'm not able to get information with Getfeatureinfo when clicking on point & line layers. For polygons it works fine. I'm using the code below to execute the WMS service: google.maps.event ...
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votes
2answers
4k views

PostGIS: Find points that lie within a set of coordinates

I have a PostGIS db, and I want to find the points that lie within some region (a bounding box). I have two sets of coordinates, from which I can get all four rectangle points that form the box (if ...
6
votes
3answers
122 views

Waypoints with coordinates in R

I have a SpatialLineDataFrame with 20 observations of 4 variables (in WGS84). I want to create waypoints every 10 meters. Every waypoint will has the x y coordinates. I tried to do it manually like: ...
2
votes
1answer
896 views

What are nodes in ArcGIS and how do you create them?

I want to create a elevation profile of a cross section so a polyline on ArcGIS. I wanted to regularly space around 1000 points per 1700m long xsection and extract elevation data for each node/point ...
1
vote
1answer
23 views

Getting NULL-values when point sampling USGS (SRTM 1 Arc-Second Global) grid (QGIS 2.8.2)

I use the Point Sampling Tool in QGIS to transfer gridvalues (of DEMs) to point features. This goes well with grids from f.i. MapMart (SRTMHARRIS_DEM), but I get only NULL-values when using grids from ...
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0answers
18 views

Issue when creating points with php and entering them in postgis

I pass some data to a postgis table defined as: CREATE TABLE categoriesdata (id serial NOT NULL, name character varying(200), geom geometry(Point,4326), CONSTRAINT obj_geom_pkey PRIMARY KEY ...
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vote
1answer
34 views

What is CID field created by Create Random points?

In ArcGIS the result of Create Random Points tool when using a feature class to constrain the extents has an attribute called CID. What do the values in this field represent?
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4answers
9k views

Change number of decimal digits for features in ArcGIS 10?

I am editing vertices in polygons and points in ArcMap 10, and realised that they only hold 3 decimal digits for the X, Y coordinates, but I would like at least 6 decimal digits. Even if I type in ...
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0answers
22 views

Display different symbols in QGIS using Point Displacement renderer

How to display different symbols (not different in size, different in shape and color) on the same point in QGIS 2.8 using Point Displacement renderer? I want my layout with symbols around the ...
0
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1answer
52 views

Clicking on points in ArcGIS Android

This seems like it should be very easy to do, but I am unable to click on a point and have the map recognize that I have clicked on the point. I first tried just creating a simple point, setting the ...
2
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0answers
43 views

Generate ID for the grid of points from top-left corner down

I have a grid of points extracted from a raster. I need to give them a new ID value to be able to join values from it to another grid in rotated system of coordinates.The automatically generated ID ...
7
votes
4answers
3k views

How to create different diameter circles round points?

I want to map a tree survey. I am thinking that I will plot positional points of the trees and then add other data like tree type etc. to the attribute table later. Is there a way I can have an ...