Linked Questions

3
votes
0answers
91 views

Algorithm to find the boundary grid points [duplicate]

Let us consider a set S consisting of a collection of grid locations (i,j),i,j=1,\ldots,n, in 2-dimensional gridded plane. Here the point (i,j) corresponds to a rectangular grid in the X-Y plane. ...
0
votes
0answers
71 views

Creating polygon boundaries to group points based on common attributes using ArcGIS Desktop? [duplicate]

Does anyone know of a tool, algorithm or code that I can use to create boundaries to group points? Some groups are in defined, obvious clusters and some are mixed with lots of different coloured ...
55
votes
10answers
41k views

Creating drive time polygons using Open Source tools?

Is anyone using open source tools and/or data to generate drive time polygons that radiate out from a given location? For example, I have used ESRI products like Network Analyst and Business Analyst ...
18
votes
6answers
26k views

Finding boundary co-ordinates from given set of point co-ordinates?

Given a set of coordinates, How do we find the boundary coordinates. <== Figure 1 Given the coordinates in the above set, How can I get the coordinates on the red boundary. Boundary is the polygon ...
9
votes
1answer
8k views

Create Complex Polygon from Point Layer using only Boundary Points in ArcGIS

I need to convert a point layer to a polygon, using the boundary points from a complex grid to define the polygon's edges. This has been addressed as questions for other formats (postGIS, QGIS), but ...
7
votes
2answers
1k 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.
9
votes
4answers
2k views

Creating polygon connecting endpoints of multiple lines using ArcPy?

I'm trying to figure out how to create a polygon that connects all the endpoints of a shapefile containing a set of polyilnes with pythonscript in ArcGIS, I'm having trouble doing this as the order of ...
8
votes
5answers
3k views

How to Geocode a City

I know that I can just call one of any number of geocoding APIs to perform this for me. This is more of a curiosity than anything else. With that aside, how does someone (like Google) turn a city ...
5
votes
4answers
3k views

How to merge close points into polygon?

I have a set of coordinates (points & no overlaps) in a single table,each containing attribute number fields,like in the following image. I want to merge these points into smallest polygons by ...
4
votes
1answer
5k views

Best way to get Convex Hull/Boundary of millions of points

I've been trying to do some point analysis on some xyz data, I'm at the point where I've decided it is best to produce a boundary of my xyz files and put this with the metadata for each survey. Now ...
4
votes
3answers
421 views

Amoeba Shape object

I am doing a project for an organization using OL. I was successful in creating buffers around a point for a given radius, but I was just shocked from their response,they just asked me is there a ...
12
votes
1answer
9k views

Building extraction with LiDAR data (Improve Process)

I have the following process for automatically creating building outlines/footprints from Las files and was wondering if anyone can help improve it or has suggestions for other processes to use? ...
5
votes
4answers
1k views

How to group individual groups of pixels into a single class

I have a raster image with certain pixel groups of equal area. Each group represents a single house. I want all the pixels near a group of houses to have the same pixel value, i.e., I want to name ...
4
votes
2answers
5k views

Create a single connected polygon from multiple polygons

I am trying to create a single continuous (neighborhood) polygon from many tax block parcels. The Multipart to Singlepart GP tool does not accomplish the task since I need the polygon to be complete; ...
6
votes
2answers
2k views

How to enclose clustered points with polygon?

I have a raster with forest (1), no forest (2) data. "1" is represent single/few trees and there is gaps between them. I want to create a polygon around these trees to a forest map. It is not a dense ...

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