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I have a table of boundary polygons, a table of points and a table of other_points I want to work out the average distance between points contained within and other_points for each polygon. So far I have this query which works but is not very efficient, I limit distances to within 10,000...

I need to represent multiples double attributes to a line shape. One of the attribute is the total number of commuters between cities and the other is the proportion in relation to the total population of the city of origin. The result should look alike this picture: Is there a way to do this...

I try building a map using CartoDB.js. The map displays a number of points. When a point is clicked, I change the layer SQL to filter some points out. What I want is that when user click on the map, outside of any point, I can handle this event to revert the map to initial state. Will it be...

After reinstallation of arcmap (10.2.1), when I click on arcmap, only the display window opens and does not show any other options including arc catalog or toolbox. I have to open Arc catalog through a separate window. Earlier, when I used to open arcmap, the window used to show both display...

I am a GIS Masters student. I am hoping to follow a future career in GIS. But I don't have a very good background in Maths. Is it necessary to have Maths knowledge for a GIS carreer? أكثر...

I have 2 shape files. One shows the political regions of Scotland. The other shows the political constituencies of Scotland. I need to simplify them to display in a webpage. The problem is that when I simplify them there are small discrepancies between edges on the regions compared with the...

I would like to have my own stylized map. I see that google api can dynamically build stylized map (http://googlemaps.github.io/js-samples/styledmaps/wizard/index.html) But I can't save my interested area (let say Lyon in France) as a local map to use it offline. I also used QGIS...

How can i do the suitability analysis for site selection (Restaurant) using QGis is there is a specific model or method for this in Qgis? أكثر...

I wrote some code that basically loops over all features in a shapefile with Fiona in Python, doing some things, calculating some things, etc. I found that it would exit the for loop prematurely, depending on the data set I fed it. I found that it would work fine if I removed some code that (to...

I'm keen to create some contours (isochrones for a pedestrian 'ped-shed' catchment) from a point dataset in QGIS, using the contour plugin from the Plugins repository. I installed the plugin, but restarting QGIS generated a popup saying that the plugin had been disabled because one or more of...

I have a openlayers map and I want to simulate driving a route on it.I would like to draw a line (using GPX tool) and create gps coordinates (preferred with advancing time stamp) so I can query them based on time and show on the map the advancement. what is the easiest way doing this...

I'm very new to Mapbasic. I tried to make a short code to draw some BTS in GSM but I can't do thant (over 1 month). I have a table with these column: Sitename, Lon, Lat, Azi, Beam, Dist. Can someone help me to correct the code. Trash=ApplicationDirectory$()+"Sectors.tab"Create Table Sectors...

I would like to collect 50,000 individual multipolygons into one big multipolygon. Unfortunately when I perform ST_Collect(geom) it bundles them into a geometry collection and cannot be cast as ::geometry(MultiPolygonZ, 2193) which is of no use to me. How do I get prevent this from happening? I...

I'm an electrical engineering student taking GIS introductory course as an elective. i have learned the basics of Arcmap 10 like adding data, creating maps, editing shapefiles etc. Now, i'm required to do a project using arcmap 10. i decided to do something relating to my field: Finding the...

Bonjour, Je cherche à déplacer des polygones en leur attribuant à chacun un nouveau centroïde. J'ai une couche de polygones avec leur identifiant, surface, X_centroïde et Y_centroïde. J'ai rajouté dans cette couche les champs nouveau_X et nouveau_Y. Mais je ne trouve pas comment faire... أكثر...

Bonjour à tous, J'ai besoin de votre aide car je souhaiterais simplifier une routine que j'ai créé sur MapBasic pour sélectionner des données et les afficher dans MapInfo. Code : --------- '*************************** 'RESEAU_ROUTIER '*************************** أكثر...

Bonjour, Dans le cadre d'un projet académique, il m'a était demandé de mettre en place un service feu de brousse pour une surveillance des ressources naturelles. l'application va pouvoir dérouler un algorithme de détection des feux pour en ressortir les feux en cours. j'aimerais savoir quels...

This student/faculty research project at Bloomsburg University takes a look at parking availability in Bloomsburg, Pennsylvania by analyzing parking space usage using GPS and GIS. Article written by Tony DiBiase, Jeff Brunskill, Matt Hess and Chris Podeschi. The post Using GIS to Evaluate...

by Jennie Saxe Take a drink on Amtrak! I love traveling by train. Here in the Northeast, I’m a little spoiled by the many rail transit systems that spider-web across the region. But with family in New England, my office in Philadelphia, and friends in Washington, DC, one of my favorite modes...

In his Confessions of a Hired Gun blog post this week Sam Billingsley builds a case for laser scanning services becoming a commodity. I am not completely convinced, but he raises* a number of... Click Title to Continue Reading... أكثر...