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

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9
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1answer
307 views

Measuring distances between simultaneous points

I am working with GPS data and so I have UTM's with DATE/Time information. I have 2 groups of species (moose and wolves). I want to join the information from moose to wolves that match in time. So, ...
1
vote
1answer
72 views

Reduce number of points, keeping most recent data within a given distance

I have a HUGE dataset of points that were collected along a route. The data may change daily, and the most recent data is the most important. What I would like to do is take only 1 point from a given ...
1
vote
2answers
227 views

Moving labels after converting to annotation in ArcGIS for Desktop?

I'm trying to move some of my labels individually around some of these points so that they don't overlap with each other or crowd each other out. When I converted them, I chose to store the ...
0
votes
0answers
40 views

Point to Raster Converting Result

I had a problem with Point to Raster converting result. I had an Excel file which contains x, y and z values. I wanted to create an individual raster data from classified z values so I planned to use ...
1
vote
1answer
38 views

is there an operation for measuring constancy (ecology)

I'm looking for an effective way to measure changes in spatial location in a time series data set (whether an observation repeats in the same location between successive time-steps, or if it shifts ...
2
votes
1answer
87 views

Create Raster Surface from Points and Equations in ArcGIS

I want to use point data to create a raster surface which distributes the values over space, as defined by an equation, and NOT by interpolating. I have an equation to describe how the characteristic ...
1
vote
1answer
77 views

How to delete duplicate LiDAR points?

How can I delete duplicate lidar points. I incorrectly read the same las twice and saved as a one file resulting in duplicate XY points. How should I delete these duplicate points?
1
vote
0answers
68 views

Creating one dataset from several overlapping point datasets using ModelBuilder?

I am trying to build a model in which I create 9 point data sets that are subsets of one large point data sets. The 9 small point data sets are suitability analyses for tree species. So one point can ...
1
vote
2answers
188 views

How to automatically convert dots on paper maps to vector points?

I have several paper maps with dots that I need to convert to vector points. I was hoping to get some suggestions on how to accomplish this without recreating each and every point by hand. I know ...
2
votes
1answer
64 views

How to add point features with coords taken from a .txt and show them on the map canvas?

Ok, so i am on Windows 7 and using QGIS 2.6 and i have a .txt file with some simple coords. I have extracted the coords to a list, no prob with that. But i looked at the PyQGIS cookbook on how to add ...
-1
votes
1answer
67 views

Single point in R

My question might be very simple. I want to create a single point (with xy coordinates) in a specific region, in a specific position. I don't want to do that with qgis I want to do that in R. Is there ...
1
vote
1answer
44 views

create a zip code value to points

I have a shapefile of points (samples collection locations) with their longitude and latitude and the number of samples collected in each location. My goal is to create a raster of the number of ...
2
votes
1answer
73 views

Is there a better way to convert Raster to Point data? Don't need one point for every cell

I need to convert raster data to point data so I can use the points for interpolation via kriging. My problem is that my resolution is 5 ft and I'm working on a whole city. The data I am converting ...
15
votes
4answers
6k views

How to join 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 ...
2
votes
1answer
177 views

How to create one random point per grid cell? (i.e., systematic sampling with randomly placed points)

Using ArcMap, I have used the Fishnet tool to create a grid of 1km squares. I am looking to create random points so that there is one (randomly placed) point per grid cell, with a minimum distance of ...
1
vote
1answer
76 views

ArcGIS geometry update from table XY

I am trying to update the geometry of a point FC stored in a FileGeodatabase using ArcPy. I got this Python script to compare the values of the SHAPE@X and SHAPE@Y and change the Geometry if not ...
1
vote
2answers
624 views

QGIS create layer with the points of the beginnings and ends of a polylines layer (without duplicate points)

In QGIS, i would like to create a new layer containing the beginning and end points of a polylines layer, but without the duplicate points that would result of adjacent polylines.
4
votes
1answer
96 views

Calculate distance from all points to all lines within 10km using FME?

I have a polyline shapefile and a point shapefile. The points are along the polylines. There are over 100 lines and over 10,000 points. I want to calculate the perpendicular distance from every ...
2
votes
1answer
69 views

Point to Raster vs Feature to Raster

I am converting point vector data to a raster dataset using nearest neighbor. I am using arcgis 10.2. The first step is to use the conversion toolbox, but there are two possible options: Point to ...
3
votes
2answers
1k views

Calculating the distance between points and multiple lines?

I have a point shapefile of about 100 points and a polyline shapefile of about 200 lines and I am interested in finding the distance between every point and each individual polyline. My polyline ...
1
vote
1answer
32 views

Is there an out-of-the-box way to manage 1:n data in QGIS?

I think an image explains the question best: What I basically want to do is select the object, view its attributes and from there call the second table to view/edit/add status entries. Since I ...
7
votes
6answers
14k views

Creating polygons around extent of similar points using ArcGIS Desktop?

I've millions of points collected for lithology layer. They have used a coding for different types of rocks. I need to create a polygon around the extent of similar points. What is the easiest ...
5
votes
4answers
4k views

How to randomly subset X% of selected points?

What methods are available in ArcGIS 10.2 to randomly subset a selection of points. For example, in the attached screenshot I am interested in keeping 20% of the selected points and deleting the ...
1
vote
3answers
152 views

Appending interpolated or nearest raster cell value to vector point on a cell with no data?

I have been searching for a solution to this problem, but was not satisfied by the answer given in Finding nearest raster cell value based on vector point? I have some points that land on cells ...
0
votes
1answer
55 views

Pasting Point goemetry with Z and M values to Simple Point Geometry

This should be kind of easy but I'm looking for a best practice scenario. I just tried adding 14 points from a point shapefile into another layer in our ArcSDE database. I assumed the layer in SDE was ...
0
votes
0answers
77 views

What's the best way to convert points to raster and back again?

To convert raster grids to vector points In QGIS there we have different possibilities (grass tool "to.vect"; saga tools "grid values to points"). My problem is a little bit complicated. In the ...
1
vote
2answers
101 views

Shapefile created in QGIS will not display properly in ArcGIS

I was asked to created a point shapefile of a cemetery. The points display correctly in QGIS but not in ArcGIS. I think the issue is with the coordinate system I created it in (WGS 84 / UTM zone 17N). ...
2
votes
2answers
60 views

Why do I get green crossed circles instead when I try to move a point?

It's really horrible I must say. I sometimes have geometry issues and then try to go one by one through them and fix these cases. Therefore I mark the area points and delete them for instance. After ...
5
votes
1answer
6k views

Create point in intersections of two layers

I have two layers. One of them is 'Road_line' and another one is 'forest_shape'. I want to create a point layer that has points in intersection of that layers. I couldn't find any tools for it.
0
votes
1answer
68 views

Create polygons from point dataset, where each polygon contains 3 points from the dataset

I'm using qgis Brighton I have a dataset of 1500 points. I want to create polygons, where each polygon contains n=3 points from the dataset. The aim of this is to have clusters of 3 points, which ...
3
votes
2answers
91 views

Analysis of lines in a point in QGIS

I have 33 layers, 1 with points and 32 with lines. I want to extract/highlight the points where more than one line is intersecting. I have tried with buffers but I'm not getting anywhere.
1
vote
0answers
38 views

Calculate Sum on One Field Within Several Different Point Feature Classes?

I have several point feature classes (eg: the location of mall, liquor stores, etc), that I need to get the count of within a specified city district. Basically, I want to great a modelbuilder model ...
12
votes
2answers
1k views

How much sense does it make to average (lat,lon) samples in order to increase 2D accuracy of a GPS location?

Several GPS applications, like this one, or this one, acquire multiple (lat,lon) samples of a given location, assuming that the GPS unit is not moving, and then take an average of the samples in order ...
3
votes
2answers
2k views

From point to Grid of polygones or polylines

Is it possible to reconstruct a grid of polygones or polylines from the centroids? I am looking for a arcGIS tool or script that will allow me to reconstruct a grid of polygons or polylines from ...
6
votes
1answer
627 views

How to offset points along a line in QGIS?

I used the "Profile from Line" plugin to create evenly spaced points along a line in QGIS, but I'd like to offset them to either side of the line. I suppose I could draw two lines parallel to the ...
0
votes
1answer
71 views

Merge two points of two different polygons to get one polygon at the end

I would like to join points from two different features. I already searched for plugins but so far but didn't find one working plugin or solution for my task. So here is a picture of 2 ...
1
vote
1answer
39 views

Getting species geodata (via Lifemapper)

In the search for species occurence data I stumbled on the Lifemapper project (http://lifemapper.org/). For creating biological models they posess a very comprehensive database. Unfortunately it does ...
0
votes
0answers
45 views

How to map data from USGS NAS database, using HUC?

I am querying the USGS NAS (Nonindigenous Aquatic Species) database. The collection data for the results that are returned don't include lat/long points, but have an HUC (Hydrologic Unit Code). I have ...
10
votes
2answers
3k 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 ...
2
votes
1answer
214 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
480 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
67 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 ...
1
vote
0answers
16 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
73 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
94 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
398 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
75 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
362 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
38 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 ...