wms
I am facing this problem 3th day and I really don't know where is the problem, so please help me.
Here is Capabilities file: http://geoportal.cuzk.cz/WMS_SM5V_PUB/WMService.aspx?service=WMS&request=GetCapabilities&
Can somebody please explain me why blank map is returned?
The difference between WMS 1.1.1 and 1.3.0 is two fold.
CHANGE NO 1 - CRS/SRS Usage
Use SRS for 1.1.1
Use CRS for 1.3.0
CHANGE No 2 - WMS 1.3.0 ONLY
The order of parameters for BBOX depends on whether the CRS definition has flipped axes. You will see this in the GetCapabilities request at 1.3.0 - the response should show the flipped axes.
BBOX=xmin,ymin,xmax,ymax NON-FLIPPED
BBOX=ymin,xmin,ymax,xmax FLIPPED
I have made a list of EPSG codes that need to be flipped by creating a SpatiaLite 4.3.0 database and then saving this SQL request to file:
SELECT auth_srid, has_flipped_axes, ref_sys_name, axis_1_name, axis_1_orientation, axis_2_name, axis_2_orientation FROM "spatial_ref_sys_all" WHERE auth_name = "epsg";
You will then see that EPSG:4326 needs to have flipped axes.
4326 1 WGS 84 Latitude North Longitude East
THIS IS THE CORRECTED 1.3.0 REQUEST
Change is BBOX=24,-126,50,-66
There is a WFS service available, too, which allows you to access the underlying data that you see in the WMS response. You can browse all of these here in the Geoserver interface:
https://maps.huntscore.com/geoserver/web/?wicket:bookmarkablePage=:org.geoserver.web.demo.MapPreviewPage
Then you can make a request just for the feature you want, which is well covered by this question's answers: Passing Filter Parameters to GeoServer WFS via URL?
The query you want is something like this (this one returns GeoJSON):
https://maps.huntscore.com/geoserver/ows?service=wfs&version=1.0.0&request=getfeature&typename=colorado:BigGameGMUBoundaries12092014&CQL_FILTER=GMUID=84&outputFormat=application/json
You will need to apply your own styling once you have the features you are after. Perhaps the best thing to do is to continue requesting the WMS image as you are already doing, but also overlay the result of the WFS request on top in the client, and style that as you see fit.
EDIT: to stay within WMS, what you want to do is specify multiple layers (well, the same layer twice), and apply two filters, and two styles:
http://maps.huntscore.com:8080/geoserver/colorado/wms?service=WMS&version=1.1.0&request=GetMap&layers=colorado:BigGameGMUBoundaries12092014,BigGameGMUBoundaries12092014&cql_filter=GMUID%3E0;GMUID=84&styles=MiniMap_Outlines,MiniMap_Polygon&bbox=139992.54690000042,4094064.75,763240.4375,4546735.0&width=768&height=557&srs=EPSG:26913&format=image%2Fpng
Best Answer
SM_STP_HRBITOV is part of a group layer called Symboly_typu_pozemku. You can view the layer on its own, but as it appears there aren't many of this type of symbol in the map, you might want to check your query with the group layer...
Layers in this group are scale dependent
Which roughly equates to 1:6500 in a GIS client. I have the group layer showing in QGIS at 1:6700 for example.
Looking at your query using the group layer instead also returns a blank image, so whilst it is possible that the reason your query returns a blank image is that there are no such layer features in the region you have selected, it is more likely that your query is too big ~ attempts to pull back an image at a smaller scale than that supported by the symbology layer.
Some examples of requests that work are:
symbology layer
SM_STP_HRBITOV layer