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I'm looking for ideas on how to measure the compactness of a set of points. The idea is similar to identifying clusters, but instead I want to compare two distinct sets of points and return a measure of how compact one set is compared to the other. So far the only research I've come across is...

I have the lat,long co-ordinates of all crime spot in a city. I wanted to create a choropleth map based on the data. I figured out how to generate map tiles and serve them using mapnik. How can i group the individual points of crime and color code the polygons in choropleth map based on crime...

I have a table where properties are identified by their PID. A property can have multiple civic address points (e.g. larger buildings), but even when they do they still tend to border on only one street. For example in the table below Property #3459 has three civic addresses that all border...

I have been loading a number of shapefiles into SQL server 2012 using ogr2ogr.exe and the MSSQLSpatial driver. Up until this point, I have been very successful with doing so. However, I have now run into difficulty with certain files and the errors thrown by various tools are not terribly...

I have a feature dataset and want to find the cost of travel between each pair of features. Because I'm looking for road (not Euclidean) distances, I was told that the OD Cost Matrix solver in Network Analyst is the way to find the costs in ArcGIS. However, if my dataset has n features, the...

it seems that when OpenLayers 3 has a problem, it silently ignores it, leaving me to guess as to why something is going wrong with a map. How can I get it to give error messages that will give information about things going wrong? I am using ol-debug.js. For example, my current problem is...

Didn't see this discussed before. What earns contribution points towards GISP certification? Does volunteering to answer on forums will help contribute? أكثر...

I have a map created with CartoDB, but when I give the bit.ly link to others, or view it in incognito, I see the message: "Looks like this map no longer exists or is set as private." This is the link to the map: http://bit.ly/1OwBmCB The visibility is set to public. How can I make it so that...

I have installed in my computer the following software: PosgresSQL 9.3.2.3 PostGIS 2.1.1.1 QGIS 2.0.1 Dufour (this one installed through the OSGeo4w package) QGIS 1.7.0 Wroclaw As far as I know all of them somehow operate, or use, or access the GDAL library. Are they independent versions of...

I've been working with QGIS/PostgreSQL/PostGIS for a while now, without problems. But now I have to change QGIS for ArcGIS 10.1. I'm having trouble adding a layer from PostgreSQL and being able to edit that layer. Basically I want to work directly with the DB, if I change something in the map...

GIS4035/L Remote Sensing and Photo Interpretation, Instructor, Mr. Brian Fulfrost Module 10 - Supervised Classification Lab Description: For this laboratory exercise students used data that covers the County of Gray’s Harbor, located in Washington State. Assuming that the area is to be used as...

Publicamos el libro “Taller gvSIG aplicado a urbanismo” basado en los diversos talleres que hemos realizados en jornadas gvSIG de este a أكثر...

By Andrew Geller, Ph.D. I know I’m not alone in that I’ve found my mind wandering a bit this week eagerly anticipating my plans for Thanksgiving festivities. Whether you are like me and will be travelling to visit family elsewhere, or rushing to get a big bird in the oven in time for hosting...

So if you’ve been keeping up – FOSS4GNA is coming to Raleigh in 2016. There’s been some discussion on our end (since I’m on the Committee) about getting input from everyone – and the easiest way besides emailing someone on the committee is to participate on the public listserv. Have an idea...

Trying to use the "Frequency analysis" tool in a script but getting errors. The Online documentations for this tool: processing.runalg('qgis:frequencyanalysis', input, fields, output)My Script: path = "/Users/User/Desktop/"PIDs =...

I am trying to work with some crime data from https://data.police.uk/data/The data is organised in several .csv files, one for each month and each crime is geocoded with Lat and Long. As the file structure might differ from month to month I cannot merge the csv together using copy *.csv...

By Jim Jones Did you know that the Federal government is the single largest consumer in the world, spending close to $500 billion each year on a wide variety of products and services? And did you know that in March the President issued an Executive Order directing federal agencies to meet a...

What did you do for GIS Day this year? *Since 1999, GIS Day has been set aside to promote, celebrate, and demonstrate the real-world applications that are making a difference in society using Geographic Information Systems technology. GIS Day always occurs during the Wednesday of Geography...

I work on qgis plugin, and I say why not not work with GDAL, it'll be too useful. it is possible to integrate the GDAL library to develop QGIS plugin? أكثر...

I am writing a plugin that offers to open a CSV. I know the local path to the CSV but I don't know if it contains spatial data nor which name the X and Y could have. The best way I can think of, is to utilize the QGIS Delimited Text Widget and set the path to the file, so it is possible to...