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

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2
votes
3answers
110 views

Counting number of points within a grid

I'm trying to count how many floods occur within a given grid cell in ArcMap and I can't figure it out. I've been reading some other posts on here but I haven't been able to find an answer. I have ...
4
votes
3answers
146 views

Finding redundancy between two layers

Let's say I have two point layers that contain locations of wells on a property. layer A has 50 points. layer B has 35 points. Some of layer B's points already exist on layer A, and some of them ...
1
vote
1answer
19 views

Raster to point

I have a raster (5km pixel side) and I want to create a shapefile of points, one point per pixel (like a centroid), each point carring the correspondent pixel value. I run "RasterToPoint"tool in ...
1
vote
1answer
23 views

Specifying rectangle symbol with height/length based on attributes values in mapfile?

I need to specify a rectangle symbol in a mapfile. The symbols should be of varying dimensions based on height/width values stored in a table's attributes. Is it possible to do something as with the ...
2
votes
0answers
13 views

Export lines or graphics without losing the details / generate graphics without having lines overlapping [duplicate]

I am new to ArcGIS. How do I easily reproduce a spatial diagram such the one attached (Picture); from shapefiles on ArcGIS. I very often have to reproduce networks on Powerpoint at different scale ...
0
votes
0answers
18 views

Adding row to new empty table using ModelBuilder? [closed]

I can create a point feature class and start an edit session in ArcMap which adds a row and I can enter data. So far i haven't created a point - just added data to the table. What i want to do is ...
4
votes
4answers
13k 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 ...
1
vote
0answers
29 views

Is it necessary to use hibernate-spatial for postgis?

I'm beginner in GIS. I have a database in PostgreSQL that contains a table location, that table contains a column with type point. I have to get points and display it on google map. Once I did the ...
11
votes
2answers
4k views

Aggregating points to grid using R

I have a question with regard to spatial aggregation in R. What I am trying to do is aggregate a point dataset to a grid. I am unsure however how to do this as I have little experience with this sort ...
-1
votes
0answers
16 views

Assigning points to grid using R [closed]

I'm essentially trying to do the same thing explained at this link: Aggregating points to grid using R I have a household csv survey file with gps points associated with the surveys, and I have ...
2
votes
1answer
50 views

Determine if Point is in feature class attribute table

I'm working with ArcObjects, C# and ArcMap. I have an attribute table that has several rows of data including a "shape" field that holds a point geometry. I also have a random point. How can I iterate ...
1
vote
0answers
17 views

Measure the distance between points automatically

How can I measure the distance between points referring to the same element in an automated way? In fact I've imported in QGIS buildings downloaded from two different sources and obviously they are ...
-2
votes
1answer
33 views

Create a point at intersection

I want to create a point at the intersection of two lines as it appears on the attached image. The red line is the stream network, and the green line is the 600m contour. I use ArcGis 10.2.2
1
vote
0answers
34 views

Find distance from points along lines [closed]

I have two layers, one is a point layer of schools and another is a polyline layer of streets. The end goal is to create a buffer along the lines that is 20 feet from the centerline that goes 1 mile ...
0
votes
0answers
9 views

Set of points to multi polygon with specified distance

Is there any algorithm that can transform set of points to the set of polygons with defined maximum distance between points, especially I wonder if it is possible for inner polygons? Please, consider ...
2
votes
0answers
20 views

How do I merge a point attribute table to a polygon attribute table in QGIS or GRASS?

I have a point layer containing the following data: I want the following polygon areas to be added to the point attribute table as all the points occur inside the various features of the polygon ...
1
vote
1answer
14 views

QGIS, Calculate networks first, diameters second

I need to get the following task done: First, various points (stored in a shapefile, identified by a common attribute) need to be put into relation with each other (see graphical scheme, steps 1 and ...
1
vote
1answer
36 views

csv points into raster using R

I have got the forest cover data of a region in africa (raster layer) and some data collected inside this region by a survey (.csv). In the .csv file I have got x,y coordinates and 3 other columns ...
2
votes
1answer
524 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
votes
1answer
38 views

How do Wikipedia maps add a coordinate point to a base map?

On wikipedia pages for localities, there is often a map on the right side of the page in the introduction, and the map is tagged with the point of the locality. For example, see below: ...
0
votes
1answer
248 views

How to I cluster by features in CartoDB?

I have a set of points for a number of buildings in NYC. I would like to group those points into clusters per their respective neighborhood (ex: Chelsea, Upper East Side etc.). Each of my points have ...
2
votes
1answer
12 views

Geotools : New points now drawn on the map

I'm using geotools v14.3 to load a shapefile (Java Swing application). I want to allow the customers to use the mouse to click on the map area to draw new points, lines and polygons. First, I'm ...
3
votes
1answer
197 views

Space time analysis. Finding spatial patterns (cluster&disperse) over time in point data sets

I am trying to describe/find statistically spatial patterns in a point data set of industrial sites. The points feature apart from their location, a date for their opening, a date for their closure ...
1
vote
1answer
836 views

Generating Point from Centroid of Polygon falls outside of it?

I have a feature class of polygons within a geodatabase and I'm trying to generate points based on the centroid of the polygon using the Feature to Point tool in ArcGIS 9.3. However, I end up with ...
1
vote
1answer
26 views

Viewing a point geojson layer as markers in cesium

I have a point geojson layer and i would like to add and view it using cesium. I tried with the below code var dataSource1 = new Cesium.GeoJsonDataSource(); var roads = ...
1
vote
1answer
26 views

Add features to point layer in QGIS 2.12

I work with QGIS 2.12 and i try to edit point layer by adding it more point features with "add feature" button. Here my point layer: after i add the features (features num. 58-62) i save editing. ...
2
votes
1answer
40 views

Plot a point at a user input distance perpendicular to a polyline

I have a straight polyline and the distances in metres of the points I want to plot perpendicular to that line. The points are all different distances and should be measured from a different point ...
1
vote
1answer
29 views

Snap or Move a Point to its closest attribute matching line ArcMap

I have a point feature I want to snap or move to its closes line feature. Now this is easily accomplished with the Near tool. However I want the Point with its unique name attribute only to move or ...
-4
votes
0answers
23 views

Point density tool producing zero value raster in ArcGIS for Desktop?

Using ArcGIS 10.3 for Desktop, I am trying to produce a raster that will show the density of the points show in second image but the Point density tool is producing a zero value raster. This is ...
1
vote
0answers
26 views

Densification of Point Layer to get smaller Voronoi Areas

I'd like to densify a point layer to get a better spatial distribution. With "better" I mean homogeneous distributed. If I had to quantified my improvement, I would calculate the voronoi diagram and ...
1
vote
0answers
18 views

Deliminated layer cuts off imported spreadsheet at row 20

Platform: Mac, OS: Mavericks, Qgis: 2.14 Essen Exporting spread sheet from Excel as Windows .csv. No problem publishing points to map except that import will only process 20 of 23 row entries on ...
0
votes
1answer
190 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 ...
1
vote
2answers
30 views

ArcMap Random Points Minimum Distance Field not able to use units

I would like to create random points with a minimum distance based on an attribute field (polygons with a larger area need random points with more space between them). In theory this can be done. ...
0
votes
1answer
24 views

Replacing each point in a point feature with a specific shaped polygon

I have many random points in one layer. I want to replace each individual point with a specific shaped polygon like the image below illustrates. Kind of like applying some sort of irregular buffer to ...
2
votes
3answers
124 views

Is it possible to delete geometry (create NULL) but retain the feature row?

I'm trying to perform the reverse action to "display x/y". I have a point layer displayed on the map canvas, and I want to delete a point's geometry, as in remove it from the map, but retain the ...
3
votes
2answers
57 views

How to create a fishnet, where each point from a point file is located in the middle of the individual grid cells of the fishnet

I have a point dataset in ArcGIS 10, and wish to create a fishnet, where each point is in the centre of an individual grid cell. Thus each point must be in the centre of a square. I have used the ...
25
votes
7answers
41k views

How do I create point features with exact coordinates?

How do I create point features with exact (manually entered) coordinates in QGIS? I get precise GPS coordinates from a survey team which I need to add to a point layer. What I want: -Add point, type ...
0
votes
2answers
36 views

Group points and compute area

In a point vector layer, how to compute area for 4 defined ranges of values of one attribute? On the example below, I want the total area for each of the 4 colours.
0
votes
0answers
17 views

Group points in polygons [duplicate]

How to group points into polygons? In Qgis if I want to render a point vector layer into a polygon layer, grouping all same colors.
2
votes
2answers
1k views

Tracing polyline between two points in ArcGIS Desktop?

How i can draw a line between two points...e.g.: I have initial point and endpoint and i need trace a line between this points...how i can do that?
1
vote
2answers
388 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
vote
0answers
29 views

Python QGIS reliable intersection/overlap check between points and lines

In my script I need to check, whether a point I created stored in a memory layer lies on a polyline, which is in another memory layer. I am certain, that the point does overlap/intersect the line, ...
2
votes
1answer
43 views

Expand Street Network passing through points using QGIS?

I have a road network (red) passing through some traffic data points (green): I want to expand this network to include all of the points. I already have a bigger street network (blue) from which I ...
0
votes
0answers
162 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: [ ...
1
vote
1answer
59 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 ...
5
votes
2answers
270 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!
2
votes
1answer
53 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 ...
0
votes
0answers
63 views

How to load points in a SQL server polygon table?

I have a spatial table in SQL server which stores both points and polygons geometry and I am using the table to return geoJSON for API calls. I want to load some points to this table with shapetype ...
18
votes
4answers
8k views

Joining attributes from nearest point in QGIS?

I have two layers with points, call them A and B, each with different attributes. For each point in A I want to join all the attributes from the nearest point in B. Ideally this would also include ...
0
votes
1answer
184 views

Spatial Join in R

I'm fairly new to using R for spatial work so bear with me. I have found questions similar to this but nothing that answers this question specifically enough for me to implement it. I have point data ...