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. ...
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 ...
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 ...
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 ...
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 ...
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.
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 ...
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 ...
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 ...
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 ...
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 ...
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? ...
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 ...