Thanks for your input. I've looked at the DOTS_PER_INCH, but I dont think it is still a valid parameter in openlayers (at least since the version 6). But I found out that the arrow density seems to depend on the devicePixelRatio of the window. As a matter of fact, if I increase the devicePixelRatio of my browser (to a value similar to the one of my phone) by zooming it in, I get the same arrow density as the layer displayed on a smartphone. So with that information I will be able to create two different sld styles, one for higher devicePixelRatio (usually smartphones), and one for lower devicePixelRatio (usually computers). Thanks everyone for your help! Julien
Le ven. 9 sept. 2022 à 10:26, Russ Hore <r...@russ-hore.co.uk> a écrit : > I am no expert in OpenLayers but could the OpenLayers option; > > OpenLayers.DOTS_PER_INCH = 25.4 / 0.28; > > help? Can it force the DPI to be the same no matter what the Device DPI is. > > > On 9 Sep 2022, at 14:39, Julien Robitaille <robitail...@ogsl.ca> wrote: > > By resolution, do you mean the dpi resolution? Or maybe the "resolution" > of my raster layer (size of georeferenced cells)? The best way to play with > the concentration of arrows that I found was to play with > the wms_scale_denominator. So I thought I could make two different sld > styles, one for computers, and another one for smartphones, with different > values of wms_scale_denominator. And depending on the screen size and/or > resolution of screen of the user, one of the two styles would be applied to > the layer. > Thanks again, > Julien > > Le jeu. 8 sept. 2022 à 18:16, Jody Garnett <jody.garn...@gmail.com> a > écrit : > >> Please remember to include the user list (so others can answer you) and >> yeah sorry it does not support pictures. >> >> Where is the resolution of your raster determined? >> >> Jody >> >> On Thu, Sep 8, 2022 at 12:31 PM Julien Robitaille <robitail...@ogsl.ca> >> wrote: >> >>> hello, >>> As a follow up, I would just need another specification. >>> Here is the rendering when the dpi is set to 200: >>> >>> And here is the rendering when set to 60: >>> >> >> As you can see, the resolution of the image didnt change (same number of >>> arrows for the same zoom level). Only the size of the arrows have. >>> Is it the expected result? What I am looking for is a way to decrease >>> resolution for specific user cases. >>> Thanks again! >>> Julien >>> >>> Le jeu. 8 sept. 2022 à 12:22, Jody Garnett <jody.garn...@gmail.com> a >>> écrit : >>> >>>> aside: Your messages are being held because of the attached images; >>>> here is my reply. >>>> >>>> The challenge faced here is not particular to geoserver - it is a >>>> design challenge on how you wish to adapt your map to different >>>> environments. >>>> >>>> You can supply GeoServer with the dpi of the display used (have >>>> openlayers pass this information in as a format option) . GeoSerer will >>>> adjust the sizes appropriately. Much of the other information is available >>>> as env variables for use when styling. >>>> >>>> Reference: >>>> - >>>> https://docs.geoserver.org/latest/en/user/services/wms/vendor.html?highlight=dpi#format-options >>>> - >>>> >>>> https://docs.geoserver.org/latest/en/user/styling/sld/extensions/substitution.html#sld-variable-substitution >>>> >>>> >>>> On Thu, Sep 8, 2022 at 8:17 AM Julien Robitaille <robitail...@ogsl.ca> >>>> wrote: >>>> >>>>> Hello! >>>>> I found out that the difference in size from one zoom level to another >>>>> one comes from openlayers. >>>>> >>>>> But in any cases, what I would like to do is to increase the sizes of >>>>> the arrows, so it is easier to see. The problem is that the display of >>>>> those arrows depends a lot on whether the user uses a computer or a >>>>> smartphone. >>>>> Here is an example. The first picture is from my computer, and the >>>>> second one is from my phone. >>>>> As you can see, the resolution of the arrows is not the same, even at >>>>> the approximate same zoom level. >>>>> >>>>> (images removed) >>>>> >>>> >>>>> As you can see, increasing the size of the arrows would make the app >>>>> unreadable on the phone. >>>>> Does anyone know how to address this problem? Is it something that can >>>>> be fixed by geoserver, or is it more of an openlayers' problem? >>>>> >>>>> Thanks a lot for your help! >>>>> Julien >>>>> >>>>> Le mar. 6 sept. 2022 à 10:08, Olivier Gagnon <mcno...@hotmail.com> a >>>>> écrit : >>>>> >>>>>> Hi Julien (je suis aussi du Québec) ! >>>>>> >>>>>> Have you tried using a fixed value for the Size attribute ? >>>>>> >>>>>> ex: <Size>8</Size> >>>>>> >>>>>> As I can see in your sld, the size is modified using the Categorize >>>>>> function. >>>>>> >>>>>> Hope this helps. Good Luck! >>>>>> >>>>>> Olivier >>>>>> >>>>>> Envoyé à partir d’Outlook <http://aka.ms/weboutlook> >>>>>> >>>>>> ------------------------------ >>>>>> *De :* Julien Robitaille <robitail...@ogsl.ca> >>>>>> *Envoyé :* 6 septembre 2022 08:53 >>>>>> *À :* geoserver-users@lists.sourceforge.net < >>>>>> geoserver-users@lists.sourceforge.net> >>>>>> *Objet :* [Geoserver-users] proper use of sld to display wms layer >>>>>> >>>>>> Hello! >>>>>> I have a raster layer that displays surface currents. >>>>>> Everything works great, but there are some details that I wish to get rid >>>>>> of but dont know how to. >>>>>> Below, the two pictures show what the layer looks like at a different >>>>>> zoom level. The first one is zoomed out compared to the second one. As >>>>>> you can see, the arrows are smaller on the second one. I wish it wasnt >>>>>> like >>>>>> this. I'm trying to make it so that the arrows stay the same size. >>>>>> I've tried to play around with the wms_scale_denominator property in >>>>>> my sld, but it doesnt seem to do the trick. >>>>>> >>>>>> (images removed) >>>>>> >>>>>> Here is my SLD: >>>>>> >>>>>> <?xml version="1.0" encoding="ISO-8859-1"?> >>>>>> <StyledLayerDescriptor version="1.0.0" >>>>>> xsi:schemaLocation="http://www.opengis.net/sld >>>>>> StyledLayerDescriptor.xsd" >>>>>> xmlns="http://www.opengis.net/sld"; >>>>>> xmlns:ogc="http://www.opengis.net/ogc"; >>>>>> xmlns:xlink="http://www.w3.org/1999/xlink"; >>>>>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";> >>>>>> <NamedLayer> >>>>>> <Name>currents</Name> >>>>>> <UserStyle> >>>>>> <Title>currents</Title> >>>>>> <FeatureTypeStyle> >>>>>> <Transformation> >>>>>> <ogc:Function name="ras:RasterAsPointCollection"> >>>>>> <ogc:Function name="parameter"> >>>>>> <ogc:Literal>data</ogc:Literal> >>>>>> </ogc:Function> >>>>>> <ogc:Function name="parameter"> >>>>>> <ogc:Literal>interpolation</ogc:Literal> >>>>>> <ogc:Literal>InterpolationBilinear</ogc:Literal> >>>>>> </ogc:Function> >>>>>> </ogc:Function> >>>>>> </Transformation> >>>>>> <Rule> >>>>>> <Title>Heading</Title> >>>>>> <PointSymbolizer> >>>>>> <Graphic> >>>>>> <Mark> >>>>>> <WellKnownName>extshape://narrow</WellKnownName> >>>>>> <Fill> >>>>>> <CssParameter name="fill"> >>>>>> <ogc:Function name="Categorize"> >>>>>> <ogc:Function name="sqrt"> >>>>>> <ogc:Add> >>>>>> <ogc:Mul> >>>>>> <ogc:PropertyName>u</ogc:PropertyName> >>>>>> <ogc:PropertyName>u</ogc:PropertyName> >>>>>> </ogc:Mul> >>>>>> <ogc:Mul> >>>>>> <ogc:PropertyName>v</ogc:PropertyName> >>>>>> <ogc:PropertyName>v</ogc:PropertyName> >>>>>> </ogc:Mul> >>>>>> </ogc:Add> >>>>>> </ogc:Function> >>>>>> <ogc:Literal>#e0e2e6</ogc:Literal> >>>>>> <ogc:Literal>0.514</ogc:Literal> >>>>>> <ogc:Literal>#96ade4</ogc:Literal> >>>>>> <ogc:Literal>1.03</ogc:Literal> >>>>>> <ogc:Literal>#376AE2</ogc:Literal> >>>>>> <ogc:Literal>1.542</ogc:Literal> >>>>>> <ogc:Literal>#249D53</ogc:Literal> >>>>>> <ogc:Literal>2.056</ogc:Literal> >>>>>> <ogc:Literal>#F98308</ogc:Literal> >>>>>> <ogc:Literal>2.57</ogc:Literal> >>>>>> <ogc:Literal>#F91A08</ogc:Literal> >>>>>> </ogc:Function> >>>>>> </CssParameter> >>>>>> <CssParameter name="fill-opacity"> >>>>>> <ogc:Function name="Categorize"> >>>>>> <ogc:Function name="sqrt"> >>>>>> <ogc:Add> >>>>>> <ogc:Mul> >>>>>> <ogc:PropertyName>u</ogc:PropertyName> >>>>>> <ogc:PropertyName>u</ogc:PropertyName> >>>>>> </ogc:Mul> >>>>>> <ogc:Mul> >>>>>> <ogc:PropertyName>v</ogc:PropertyName> >>>>>> <ogc:PropertyName>v</ogc:PropertyName> >>>>>> </ogc:Mul> >>>>>> </ogc:Add> >>>>>> </ogc:Function> >>>>>> <ogc:Literal>0</ogc:Literal> >>>>>> <ogc:Literal>0.001</ogc:Literal> >>>>>> <ogc:Literal>1</ogc:Literal> >>>>>> <ogc:Literal>1000</ogc:Literal> >>>>>> <ogc:Literal>0F</ogc:Literal> >>>>>> </ogc:Function> >>>>>> </CssParameter> >>>>>> </Fill> >>>>>> </Mark> >>>>>> <Size> >>>>>> <ogc:Function name="Categorize"> >>>>>> <!-- Value to transform --> >>>>>> <ogc:Function name="sqrt"> >>>>>> <ogc:Add> >>>>>> <ogc:Mul> >>>>>> <ogc:PropertyName>u</ogc:PropertyName> >>>>>> <ogc:PropertyName>u</ogc:PropertyName> >>>>>> </ogc:Mul> >>>>>> <ogc:Mul> >>>>>> <ogc:PropertyName>v</ogc:PropertyName> >>>>>> <ogc:PropertyName>v</ogc:PropertyName> >>>>>> </ogc:Mul> >>>>>> </ogc:Add> >>>>>> </ogc:Function> >>>>>> <ogc:Literal>13</ogc:Literal> >>>>>> <ogc:Literal>0.514</ogc:Literal> >>>>>> <ogc:Literal>13</ogc:Literal> >>>>>> <ogc:Literal>1.03</ogc:Literal> >>>>>> <ogc:Literal>16</ogc:Literal> >>>>>> <ogc:Literal>1.542</ogc:Literal> >>>>>> <ogc:Literal>19</ogc:Literal> >>>>>> <ogc:Literal>2.056</ogc:Literal> >>>>>> <ogc:Literal>22</ogc:Literal> >>>>>> <ogc:Literal>2.57</ogc:Literal> >>>>>> <ogc:Literal>25</ogc:Literal> >>>>>> </ogc:Function> >>>>>> </Size> >>>>>> <Rotation> >>>>>> <ogc:Function name="toDegrees"> >>>>>> <ogc:Function name="atan2"> >>>>>> <ogc:PropertyName>u</ogc:PropertyName> >>>>>> <ogc:PropertyName>v</ogc:PropertyName> >>>>>> </ogc:Function> >>>>>> </ogc:Function> >>>>>> </Rotation> >>>>>> </Graphic> >>>>>> </PointSymbolizer> >>>>>> </Rule> >>>>>> </FeatureTypeStyle> >>>>>> </UserStyle> >>>>>> </NamedLayer> >>>>>> </StyledLayerDescriptor> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Thanks a lot for your help! >>>>>> -- >>>>>> >>>>>> Julien Robitaille >>>>>> Scientifique de données >>>>>> Data scientist >>>>>> En télétravail - Working from home >>>>>> >>>>>> Visitez notre site web pour en savoir plus sur notre campagne de >>>>>> communication en cours! >>>>>> Visit our website to learn more about our ongoing communication >>>>>> campaign! >>>>>> >>>>> >>>>> >>>>> -- >>>>> >>>>> Julien Robitaille >>>>> Scientifique de données >>>>> Data scientist >>>>> En télétravail - Working from home >>>>> >>>>> Visitez notre site web pour en savoir plus sur notre campagne de >>>>> communication en cours! >>>>> Visit our website to learn more about our ongoing communication >>>>> campaign! >>>>> >>>>> _______________________________________________ >>>>> Geoserver-users mailing list >>>>> >>>>> Please make sure you read the following two resources before posting >>>>> to this list: >>>>> - Earning your support instead of buying it, but Ian Turton: >>>>> http://www.ianturton.com/talks/foss4g.html#/ >>>>> - The GeoServer user list posting guidelines: >>>>> http://geoserver.org/comm/userlist-guidelines.html >>>>> >>>>> If you want to request a feature or an improvement, also see this: >>>>> https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer >>>>> >>>>> >>>>> Geoserver-users@lists.sourceforge.net >>>>> https://lists.sourceforge.net/lists/listinfo/geoserver-users >>>>> >>>> -- >>>> -- >>>> Jody Garnett >>>> >>> >>> >>> -- >>> [image: OGSL Logo] <https://ogsl.ca/> >>> Julien Robitaille >>> Scientifique de données >>> Data scientist >>> En télétravail - Working from home >>> [image: Facebook Logo] <https://www.facebook.com/ogsl.slgo/> [image: >>> Twitter Logo] <https://twitter.com/ogsl_slgo/> [image: LinkedIn Logo] >>> <https://www.linkedin.com/company/observatoire-global-du-saint-laurent---ogsl/?viewAsMember=true/> >>> Visitez notre site web pour en savoir plus sur notre campagne de >>> communication en cours! >>> Visit our website to learn more about our ongoing communication campaign! >>> [image: signature-campagne] >>> <https://ogsl.ca/fr/news/au-coeur-des-donnees/> >>> >> -- >> -- >> Jody Garnett >> > > > -- > [image: OGSL Logo] <https://ogsl.ca/> > Julien Robitaille > Scientifique de données > Data scientist > En télétravail - Working from home > [image: Facebook Logo] <https://www.facebook.com/ogsl.slgo/> [image: > Twitter Logo] <https://twitter.com/ogsl_slgo/> [image: LinkedIn Logo] > <https://www.linkedin.com/company/observatoire-global-du-saint-laurent---ogsl/?viewAsMember=true/> > Visitez notre site web pour en savoir plus sur notre campagne de > communication en cours! > Visit our website to learn more about our ongoing communication campaign! > [image: signature-campagne] > <https://ogsl.ca/fr/news/au-coeur-des-donnees/> > _______________________________________________ > Geoserver-users mailing list > > Please make sure you read the following two resources before posting to > this list: > - Earning your support instead of buying it, but Ian Turton: > http://www.ianturton.com/talks/foss4g.html#/ > - The GeoServer user list posting guidelines: > http://geoserver.org/comm/userlist-guidelines.html > > If you want to request a feature or an improvement, also see this: > https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer > > > Geoserver-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geoserver-users > > > -- [image: OGSL Logo] <https://ogsl.ca/> Julien Robitaille Scientifique de données Data scientist En télétravail - Working from home [image: Facebook Logo] <https://www.facebook.com/ogsl.slgo/> [image: Twitter Logo] <https://twitter.com/ogsl_slgo/> [image: LinkedIn Logo] <https://www.linkedin.com/company/observatoire-global-du-saint-laurent---ogsl/?viewAsMember=true/> Visitez notre site web pour en savoir plus sur notre campagne de communication en cours! Visit our website to learn more about our ongoing communication campaign! [image: signature-campagne] <https://ogsl.ca/fr/news/au-coeur-des-donnees/>
_______________________________________________ Geoserver-users mailing list Please make sure you read the following two resources before posting to this list: - Earning your support instead of buying it, but Ian Turton: http://www.ianturton.com/talks/foss4g.html#/ - The GeoServer user list posting guidelines: http://geoserver.org/comm/userlist-guidelines.html If you want to request a feature or an improvement, also see this: https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer Geoserver-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geoserver-users
