Re: [mapserver-users] Show traffic on roads.
On 2020-2-26 8:48 am, Erik H wrote: Depends on your requirements. If you just want to visualize typical traffic conditions, MapServer can do the job, it's pretty straightforward. Just join your road geometries with the congestion data (actual speed / free-flow speed), apply some filters (SQL conditions) on road class and maybe congestion (omitting non-congested roads), and render that in the appropriate color. If, on the other hand, you have a feed with speeds that vary frequently, it gets tricky because you can't really use a regular tile cache. I ended up abandoning MapServer for this - the problem was not so much the rendering, but PostGIS was getting overwhelmed. If you get your speed data from a company like HERE or INRIX, you should be able to use their tilers. If not, you have a nice challenge. How is the data created and stored? How large is the area? We do a bunch of things as a traffic services company, and have found that different things work better for different scenarios. MapServer and GeoServer have both worked for us in the past. The challenge is always on how pretty you want it to be, how much compute you're willing to spend, how often the data updates, etc. It's correct that the regular tile cache doesn't expire data in the best way to support this :) Best Regards, Mohit. 2020-2-27 | 1:44 pm. ___ mapserver-users mailing list mapserver-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Bewbie question about MapServer and WPS
Hi Petros, Since you are examining WPS, I recommend ZOO-Project (http://zoo-project.org/), from the MapServer family, which supports writing services in many languages (C, Python, PHP, JavaScript, ...), as well as creating GDAL/OGR services, and even outputting dynamic MapServer WMS services on-the-fly (meaning: it creates a MapServer mapfile that serves the result through a web map service). But here is a great working example: - MapServer is serving the background data (spatialite database) here through GeoJSON/WMS and the application leverages ZOO-Project to execute spatial commands (buffer etc). Give it a try at https://ms4w.dev/zoo-project/demo/ If you check Developer Tools in your browser, you will see at call to the ZOO loader (https://ms4w.dev/cgi-bin/zoo_loader.cgi) and sending a request such as https://pastebin.com/nhpyc2jx And the response from MapServer in GeoJSON: https://pastebin.com/G2VEVYRF All thanks to the power of ZOO-Project WPS !!! Hope that opens doors for you. -jeff -- Jeff McKenna MapServer Consulting and Training Services https://gatewaygeomatics.com/ On 2020-02-26 8:43 a.m., petros.liki...@scb.se wrote: Hi all, I have to warn you that I am entirely new to GIS and all the terminology so my questions might be strange. Nevertheless, my company wish to expose a service that receives a polygon as input and outputs statistical data about the area defined by the polygon. For instance, it could be the number of residents in different age groups, the average income, the number of companies divided by industry, etc. The service will aggregated the statistical data on the fly according to input polygon. Then it will then preform some type of disclosure control of the aggregated data before it is send back to the caller. I guess that this service should be exposed as a WPS service or is there any other type of service that is more appropriate if it should be consumable from other GIS-applications? If it should be a WPS will I be able to expose it through MapServer? If MapServer can do this or am I bound to use a specific programing language or can MapServer start an arbitrary program that dose the processing? Kind regards Petros ___ mapserver-users mailing list mapserver-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Bewbie question about MapServer and WPS
Petros I'm not sure if MapServer is what you are looking for as I is generally used the the creation and transfer of maps and it sounds like you are only concerned with retrieval of statistical information. MapServer probably could be used for the application you describe but it would be easier to simply use a WPS service of some sort (https://pywps.org/). Alternatively you could look at using postgresql with the geo-spatial postgis extension to perform your analysis any develop your own interface using whatever language you prefer. On Wed, 26 Feb 2020 at 07:51, wrote: > Hi all, > > I have to warn you that I am entirely new to GIS and all the terminology > so my questions might be strange. Nevertheless, my company wish to expose a > service that receives a polygon as input and outputs statistical data about > the area defined by the polygon. For instance, it could be the number of > residents in different age groups, the average income, the number of > companies divided by industry, etc. > > The service will aggregated the statistical data on the fly according to > input polygon. Then it will then preform some type of disclosure control of > the aggregated data before it is send back to the caller. I guess that this > service should be exposed as a WPS service or is there any other type of > service that is more appropriate if it should be consumable from other > GIS-applications? > > If it should be a WPS will I be able to expose it through MapServer? If > MapServer can do this or am I bound to use a specific programing language > or can MapServer start an arbitrary program that dose the processing? > > Kind regards > > Petros > > > ___ > mapserver-users mailing list > mapserver-users@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/mapserver-users
[mapserver-users] Bewbie question about MapServer and WPS
Hi all, I have to warn you that I am entirely new to GIS and all the terminology so my questions might be strange. Nevertheless, my company wish to expose a service that receives a polygon as input and outputs statistical data about the area defined by the polygon. For instance, it could be the number of residents in different age groups, the average income, the number of companies divided by industry, etc. The service will aggregated the statistical data on the fly according to input polygon. Then it will then preform some type of disclosure control of the aggregated data before it is send back to the caller. I guess that this service should be exposed as a WPS service or is there any other type of service that is more appropriate if it should be consumable from other GIS-applications? If it should be a WPS will I be able to expose it through MapServer? If MapServer can do this or am I bound to use a specific programing language or can MapServer start an arbitrary program that dose the processing? Kind regards Petros ___ mapserver-users mailing list mapserver-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/mapserver-users
[mapserver-users] Mapcache : Incompatible libpng version in application and library
Hello, I've compiled Mapcache from source, and the installation worked just fine, without any error, however when I run mapcache_seed, I get the following error : libpng warning: Application was compiled with png.h from libpng-1.5.13 libpng warning: Application is running with png.c from libpng-1.2.56 libpng error: Incompatible libpng version in application and library Mapcache has been compiled correctly using libpng 1.5.13, however I don't understand why mapcache_seed is trying to run with libpng 1.2.56 which is not even installed ! Any idea ? Thanks, Johannes ___ mapserver-users mailing list mapserver-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/mapserver-users
