[Qgis-user] Mean distance between points
Hi everyone, I am pretty sure that this is something that is used regularly, but I could not figure out how to do it. Basically we have a bunch of camera points (vector point data layer) and want to calculate the mean distance between the points (as well as the minimum and maximum distance between neighbouring points). Is there a specific tool or plugin that can do this automatically? Obviously I could use the measure line tool and do it manually as a last resort, but I would prefer not. Cheers, Chavoux ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Qgis-user Digest, Vol 188, Issue 30
Hi Peter, > > From: Peter Cramer > > I have a very basic question about qgis features. Thanks in advance for > any answers. > > > > The scenario is that we need to geo locate 6,000 machines in various > locations throughout Australia. > > I person will be onsite at each machine in the exact position of the > machine. > > We want to create a gps position for each machine and save it or record / > copy it > I would suggest using CyberTracker <https://www.cybertracker.org/> for this job. There might be other applications doing the same thing, but the nice thing about CyberTracker is that you can set it up to record exactly the information you want to record (e.g. computer name or IP address or take picture) and afterwards import the data from all the different GPS devices to a single file/database which can be exported to a .shp file (basic vector file format used by QGIS). > Create a list of the 6000 machines in a data base > > Use this database to display machine placements on maps at level – country > – state – suburb and or postcode > > Select a single machine and see a description of the location and or > actual zoomed in map vision of the machine location > > Zoom out or in to different levels of geographic area size to see all > machines within the screen view > QGIS can do all of this. You can either have that information (country, state, suburb and postal code) in CyberTracker and record it when you take the GPS point, or afterwards add it to the attribute file (.dbf) of your shape file (it can also be stored in a PostgreSQL (PostGIS) database from QGIS, although I have never used this and don't know how easy it is to set up). > > > Second priority level of information > > Add additional information to each machine. E.g model number and type of > machine displayed in map via hover or similar function > Yes, by editing and adding new columns to the attribute table of your shape file; easily done. > Select State – suburb or postcode to view all machines withing that > specific area. > You can select on any column the values you want and zoom to selected values in QGIS. > Build a visual presentation of maps for selected specific areas as above > point. > Yes > > > I am thinking that if qgis can do these basic things we can add to our > wish list of features later. > It can. Cheers, Chavoux Luyt (Long-time Open Source GIS user) ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Q calculates Area incorrectly
Hi John, On Fri, 8 Jan 2021, 22:01 , wrote: > > From: > To: > Cc: > Bcc: > Date: Fri, 8 Jan 2021 08:24:33 - > Subject: [Qgis-user] Q calculates Area incorrectly > > A colleague digitised a number of polygons on my laptop 3 years ago. > > I just loaded these on my desktop and used Q (3.16.2) to calculate areas, > but they report incorrectly. > I found in my data that using an area-conserving projection (e.g. Albers Equal Area) vs. a shape, direction or distance preserving projection (e.g. UTM) made a significant difference in calculated areas (e.g. home range sizes). It is often important to use the correct projection for the question you want to answer, something that caught me a little bit by surprise. Also look at the units of the projection you use... I am not sure how much recent versions of QGIS have changed in this regard, but it could be giving you the area in "square degrees" or "square meters" when you are expecting "square km" or "hectares". HTH Cheers, Chavoux Luyt ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Picture data in Map?
Thanks Stefan! I will have a look... :-) Op Wo. 18 Nov. 2020 om 08:54 het Stefan Giese geskryf: > Hello Chavoux, > > we have a small video which shows how to import geotagged photos into QGIS > with the processing toolbox. Normally QGIS will automatically uses a photo > widget in the identify tool if there is a valid path to a image. > > It is made with the german QGIS interface, but may be it will help you a > bit: https://files.wheregroup.com/index.php/s/2qf7Yg4McKwgyRY > > Best regards > > Stefan > > Mit freundlichen Grüßen > Stefan Giese > Projektleiter/Consultant > > Where2B Konferenz 2020 > 10. Dezember 2020 onlinehttps://where2b-conference.com/ > > WhereGroup GmbH > Schwimmbadstr. 2 > 79100 Freiburg > Germany > > Fon: +49 (0)761 / 519 102 - 61 > Fax: +49 (0)761 / 519 102 - 11 > stefan.gi...@wheregroup.comwww.wheregroup.com > Geschäftsführer: > Olaf Knopp, Peter Stamm > Amtsgericht Bonn, HRB 9885 > > Am 18.11.2020 um 07:47 schrieb Chavoux Luyt: > > Hi guys, > > Is there an easy way to get image data into/linked into a map in qGIS > (i.e. a plugin or something)? I have CyberTracker data with pictures taken > of footprints etc. as recorded in the veld, but when I export it to a .shp > file, the associated picture is no longer in the .dbf (neither is there a > link to it). What I really want is to have a map where when I click on a > specific point, the associated picture would pop up and show on-screen > (together with the text data, like species and behaviour associated with > that point). > > Would I need to use BLOB's (or BYTEA) in PostGIS for this functionality? > Has nobody done something similar before? > > Any advice appreciated! > > Cheers, > Chavoux > > ___ > Qgis-user mailing listqgis-u...@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Picture data in Map?
Hi guys, Is there an easy way to get image data into/linked into a map in qGIS (i.e. a plugin or something)? I have CyberTracker data with pictures taken of footprints etc. as recorded in the veld, but when I export it to a .shp file, the associated picture is no longer in the .dbf (neither is there a link to it). What I really want is to have a map where when I click on a specific point, the associated picture would pop up and show on-screen (together with the text data, like species and behaviour associated with that point). Would I need to use BLOB's (or BYTEA) in PostGIS for this functionality? Has nobody done something similar before? Any advice appreciated! Cheers, Chavoux ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Qgis-user Digest, Vol 171, Issue 17
Hi Bruno, On Wed, 6 May 2020, 12:22 , wrote: > Send Qgis-user mailing list - > From: bru...@mailbox.org > > Subject: [Qgis-user] Multi users environment: From geopackage to a > database? > > > Today we run into serious issues when two people worked with the same > geopackage. I was aware, that it is dangerous and unwise to edit the same > geopackage from two different computers at the same time. > > We are using QGIS 3.12.2 on Windows 10. The Geopackages are located on a > samba network share. > > My questions: > > 1. Is this setup that bad? > Yes, it is if you have multiple users. Preventing these kinds of issues is exactly why databases exist. > 2. I realize, that we should probably move from geopackage to a database. > Do we need PostGIS or can we use PostgreSQL? We don't need more > functinality than a geopackage offers (exept multi user read/edit > possibility and stability). > PostgreSQL comes with PostGIS as a standard add-in. For GIS work you will need PostGIS. I would say the primary reason for using PostgreSQL/PostGIS _is_ for multi-user read/edits and stability. I must confess that as a single computer single user I have never set up PostGIS or converted an existing project to PostGIS, so I don't know how difficult the process is (although from the help files it seems pretty straightforward), but I am sure there are many others on this mailing list who can help if you get stuck. HTH > Many thanks for some hints that put me in the right direction! > > Bruno > Cheers Chavoux ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] GeoPackage deadlocks
Hi, Just my two cents... this is IMHO exactly where postGIS will shine. Using PostgreSQL as backend will avoid any of these issues (i.e. prevent data corruption). For my personal projects I have never bothered with it, so I cannot say how easy it is to set up, but once it is up and running PostgreSQL is one of the most reliable database servers out there. Cheers, Chavoux On Thu, 17 Oct 2019, 21:01 , -- Forwarded message -- > From: Francesco Pelullo > To: Patrick Dunford > Cc: qgis-user@lists.osgeo.org > Bcc: > Date: Thu, 17 Oct 2019 13:09:43 +0200 > Subject: Re: [Qgis-user] GeoPackage deadlocks (Andrea Peri) > > > Il gio 17 ott 2019, 12:54 Patrick Dunford ha > scritto: > >> It's not a network issue and neither is it a Windows issue. Two >> processes accessing geopackage on a local computer can run into the same >> issue. SQlite is designed for a single user. It is very reliable when >> used as > > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Problem with GEarthView plugin
Hi everyone, The GEarthView plugin used to work, so I don't know what went wrong. I am running QGIS 2.18.11 on Debian stable (Stretch) (libpython 2.7.13-2+deb9u2, python-qgis 1:2.18.11+14stretch, libqt5core5a 5.9.1+dfsg-9). It gives me the following error message: The plugin is broken. Python said: 'module' object has no attribute 'in_' Any advice? What could have changed to stop it from working? How do I fix it? Regards, Chavoux Luyt ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] GRASS GRASS plugin
Hi guys I know this is probably in a tutorial somewhere, so in that case if you can just give the link I will appreciate it. :-) I have two questions on GRASS and the GRASS plugin. (BTW, I had downgrade my GRASS installation to get it to work with the latest qGIS on Debian Squeeze - is this a bug?). 1. Is there a way to simply import all the open (qGIS) layers (geotiff raster shape vector) into the current GRASS region without duplicating them or will I need to copy them to the right GRASS directory? (currently a subdirectory in my qGIS project directory). I created a GRASS region that is basically the same as the current visible area of my qGIS project. 2. Do I have access to all the GRASS command via the GRASS plugin, or will I have to open GRASS itself for detailed analysis? Thanks in advance Chavoux ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] qGIS 1.8 Vector Points in Polygon function?
Thanks Leyan! On 29 June 2012 08:30, qgis-user-requ...@lists.osgeo.org wrote: From: ouyang.le...@hotmail.com snip Make sure you have the ftools plugin installed and activated. I thought it would be on by default? What you want to do is done with the Join attribute by location in Vector-Data Management Leyan I did not have python-qgis installed, which is why I did not have most of the plug-ins! :-s Regards Chavoux ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] qGIS 1.8 Vector Points in Polygon function?
Hi guys I recently upgraded qGIS to version 1.8 in order to run the points in polygon analysis (see e.g. http://qgis.spatialthoughts.com/2012/02/tutorial-spatial-analysis-points-in.html). I used to have qGIS 1.7.0 installed which did not have this function in my installation (on Mepis 11 : Debian squeeze based). But I cannot find it in the new version of qGIS either? What do I need to do for this kind of analysis? (I want to use a text value of the polygon to update a text column in all the points within that polygon). Or should I just use GRASS for this kind of analysis? (Both are points and polygon are .shp files). (On this I have another question... but that is a separate issue). Thanks Chavoux ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] GRASS plugin
Hi guys Running Debian Squeeze (Mepis 11), I have installed qGIS 1.8 . I also have GRASS 6.4.2-1 installed. However, I cannot install qgis-plugin-grass (any version), because it is dependent on GRASS 6.4.0 . Is there any way to get the plugin working with the newer version of GRASS? Is it useful to have this plugin at all, or should I just import the .shp files into GRASS and do everything from there? I used GRASS a long time ago and remember that it was quite a steep learning curve, but very powerful once I knew how everything fit together. Thanks again Chavoux ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
