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I know that is asked quite often but I'm still doing it again :) I have a formula which I am not quite sure of the accuracy, Northing : (Latitude - Base_Latitude) * ( 6378137 * pi/180 ) Easting : (Longitude - Base_Longitude) * cos(Base_Latitude * pi/180) How accurate is this...

This question already has an answer here: How to Change Field Name in ArcGIS 10.2 4 answers I want to rename some fileds on a SHP file, (the fields on the DBF file), using ArcCatalog (ArcGIS...

I need to triangulate a GSM Device by using known cell towers locations and GSM readings. All Data is in a MS SQL Server as Geometry Types. herewith an example of the data : here is also a SQL View of the Data after buffering the towers with their known raduis: How do i go...

Ce lien http://anandkatakam.cartodb.com/viz/e13166bc-854f-11e4-abdb-0e018d66dc29/public_map pour voir la carte et consulter les données relatives aux morts suite aux coups de feu, taser etc. avec la police. Les sources des stats ont l'air bien documentées, avec les conditions, les articles...

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Imagine the following data set (from http://www.novaims.unl.pt/labnt/geosom/georepository/) which consists of three different regions: Obviously, blue points are more like to be located close to other blue points. The same is true for red points. Therefore, high spatial dependency can be...

I am doing a local statistic, similar to the the one described in a earlier question / answer: SELECT a.tree_id, a.species, avg(b.age) as age_avg, count(*) as samples, a.geomFROM trees a LEFT JOIN trees bON ST_DWithin(a.geom, b.geom, 100) AND a.species = b.speciesWHERE a.age IS NULLGROUP BY...

I am looking for simple solutions to evaluate the slopes of trails and paths in the form of polylines, or line features. I tried an ESRI tool I found online but I got an error message when running it stating it couldnt read my raster amongst other things. There are 2 functions I need to...

I'm using ArcGIS 10, working on the district boundaries of a country. I need to show certain cycles of a distribution and some of the districts are (partly/completely) covered in each cycle. Is there a good solution to distinct, both polygons and boundaries, that they are clearly understood to...

I stumbled across the GRASS-Tool i.segment but could not find it in my QGIS processing tool box. I found out that it is an tool within GRASS 7. How can I import Grass 7 into QGIS, and where can I download the Grass 7 files to set them in the Processing options? I can only find the standalone...

I am using ArcGIS API for JavaScript and I want to use a value from a feature class attribute as a hyperlink.For example, "template.setContent("Web Address: http://www.esri.com>${Web_Address}");This creates an info window with "Web Address" link to ESRI's website.The web addresses for my...

Today we’ve got for you another YouTube quiz by fellow GeoGeek*Guido Goudswaard. This time your challenge with be to identify 10 European countries based on a map. It might not be easy but it’s awesome:) DID YOU LIKE THE QUIZ? SUBSCRIBE TO OUR WEEKLY NEWSLETTER...

I am struggling with a query in POSTGIS I want to find linestring geometries where the geometries are containing the same point. I don't want to calculate the intersection points. I only want to get a point, if the point is a real member of both geometries. Example SELECT...

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I wish to create building footprints from the classification in our LAS files. I have filtered out the building points, using the point cloud filter. But I now trying to join the outer most points of the buildings, which I cant figure out how to achieve this. I understand that this may be a...

I have a set of points for a number of buildings in NYC. I would like to group those points into clusters per their respective neighborhood (ex: Chelsea, Upper East Side etc.). Each of my points have a designated neighborhood. Is there a way to tweak the CSS to make it happen? I don't quite...

I would like to know what is the sense of using st_buffer operation. In PostGIS reference guide there is only the syntax and a short description of this operation. Could you give some examples to understand the advantages of this operation? أكثر...

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 to generate polygon boundaries that represent the maximum distance one can travel along a road...

Hexagon and Huawei are partnering to meet the challenges of the global city dwelling population, with all its safety and infrastructure needs. Since most people live in cities, Hexagon and Huawei see an opportunity to integrate Huawei’s communications hardware with Hexagon’s safety and...

I'm new developing plugins for QGIS and am working on a plugin to add some pictures on the Composer layout. I think the appropriate place to have the plugin menu action is in the Composer menu where one can see what's going on, not the mainWindow where everything happens out of view. There is...