Hi Dave/Jody,
Thanks for the replies. I'll combine my replies to both of you as you
asked similar questions :)
Firstly, I'm using ShapeFiles for my data. I may move to use something
else later, but during my development stage it's simpler for me to be
able to drop in replacement data etc if they are simple files.
The original data is in EPSG:27700 (British National Grid), and I'm
serving it as EPSG:3857. This doesn't appear to be the issue though---I
repeated the experiments that I'll detail below using both projections
and got similar results in both. In all cases I chose a fairly large
tile size to get the most extreme results.
Anyhow, here are the experiments I've tried:
--- start ---
With Point Data
===============
SLD
===
<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
xsi:schemaLocation="http://www.opengis.net/sld
http://schemas.opengis.net/sld/1.0.0/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></Name>
<UserStyle>
<Title>red square point style</Title>
<FeatureTypeStyle>
<Rule>
<Title>red point</Title>
<MaxScaleDenominator>10000</MaxScaleDenominator>
<PointSymbolizer>
<Graphic>
<Mark>
<WellKnownName>square</WellKnownName>
<Fill>
<CssParameter name="fill">#ff0000</CssParameter>
</Fill>
</Mark>
<Size>6</Size>
</Graphic>
</PointSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
Results
=======
WMS as PNG (Approx 1:8500)
==========================
http://localhost:8080/geoserver/openmap-local/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&STYLES&LAYERS=openmap-local%3Aroundabout&SRS=EPSG%3A3857&WIDTH=1227&HEIGHT=960&BBOX=-251589.75115165487%2c6775967.934575723%2c-248658.86884834513%2c6778261.045424278
~126ms on first run (~81ms without SLD)
WMS as VectorTile (Approx 1:8500)
=================================
http://localhost:8080/geoserver/openmap-local/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&FORMAT=application%2Fx-protobuf%3Btype%3Dmapbox-vector&TRANSPARENT=true&STYLES&LAYERS=openmap-local%3Aroundabout&SRS=EPSG%3A3857&WIDTH=1227&HEIGHT=960&BBOX=-251589.75115165487%2c6775967.934575723%2c-248658.86884834513%2c6778261.045424278
~68ms on first run (~83ms without SLD)
WMS as PNG (Approx 1:17k)
==========================
http://localhost:8080/geoserver/openmap-local/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&STYLES&LAYERS=openmap-local%3Aroundabout&SRS=EPSG%3A3857&WIDTH=1227&HEIGHT=960&BBOX=-253206.87203131313%2c6774771.217351635%2c-247345.1074246937%2c6779357.439048746
~93ms on first run (~109ms without SLD)
WMS as VectorTile (Approx 1:17k)
================================
http://localhost:8080/geoserver/openmap-local/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&FORMAT=application%2Fx-protobuf%3Btype%3Dmapbox-vector&TRANSPARENT=true&STYLES&LAYERS=openmap-local%3Aroundabout&SRS=EPSG%3A3857&WIDTH=1227&HEIGHT=960&BBOX=-253206.87203131313%2c6774771.217351635%2c-247345.1074246937%2c6779357.439048746
~107ms on first run (~135ms without SLD)
With Polygon Data
=================
SLD
===
<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
xsi:schemaLocation="http://www.opengis.net/sld
http://schemas.opengis.net/sld/1.0.0/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>Polygon Test</Name>
<UserStyle>
<Title>A grey polygon style</Title>
<FeatureTypeStyle>
<Rule>
<Title>grey polygon</Title>
<MaxScaleDenominator>10000</MaxScaleDenominator>
<PolygonSymbolizer>
<Fill>
<CssParameter name="fill">#cccccc
</CssParameter>
</Fill>
<Stroke>
<CssParameter name="stroke">#000000</CssParameter>
<CssParameter name="stroke-width">0.5</CssParameter>
</Stroke>
</PolygonSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
Results
=======
WMS as PNG (Approx 1:8500)
==========================
http://localhost:8080/geoserver/openmap-local/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&STYLES&LAYERS=openmap-local%3Abuilding&SRS=EPSG%3A3857&WIDTH=1227&HEIGHT=960&BBOX=-251589.75115165487%2c6775967.934575723%2c-248658.86884834513%2c6778261.045424278
~242ms on first run (~220 without SLD)
WMS as VectorTile (Approx 1:8500)
=================================
http://localhost:8080/geoserver/openmap-local/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&FORMAT=application%2Fx-protobuf%3Btype%3Dmapbox-vector&TRANSPARENT=true&STYLES&LAYERS=openmap-local%3Abuilding&SRS=EPSG%3A3857&WIDTH=1227&HEIGHT=960&BBOX=-251589.75115165487%2c6775967.934575723%2c-248658.86884834513%2c6778261.045424278
~184ms on first run (~189ms without SLD)
WMS as PNG (Approx 1:17k)
==========================
http://localhost:8080/geoserver/openmap-local/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&STYLES&LAYERS=openmap-local%3Abuilding&SRS=EPSG%3A3857&WIDTH=1227&HEIGHT=960&BBOX=-253206.87203131313%2c6774771.217351635%2c-247345.1074246937%2c6779357.439048746
~95ms on first run (~511ms without SLD)
WMS as VectorTile (Approx 1:17k)
================================
http://localhost:8080/geoserver/openmap-local/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&FORMAT=application%2Fx-protobuf%3Btype%3Dmapbox-vector&TRANSPARENT=true&STYLES&LAYERS=openmap-local%3Aroundabout&SRS=EPSG%3A3857&WIDTH=1227&HEIGHT=960&BBOX=-253206.87203131313%2c6774771.217351635%2c-247345.1074246937%2c6779357.439048746
~5416ms on first run (~362ms without SLD)
--- end ---
The point data didn't really show any issues. It's possible that this is
because that dataset is pretty sparse in comparison to other datasets
that I'm working with. The real issues arise when using polygon
data---serving as VectorTile with the SLD took a whopping 5.5 seconds to
generate a completely empty tile, but if I turned off the SLD it only
took 0.3 seconds!
In reality I'm using TMS combined with GWC, so I'd only see these times
once when populating the cache, but it means that populating my cache is
taking an inordinate amount of time longer than it ought to.
Is there a problem with the SLDs that I have used? I basically took the
default templates and added a MaxScaleDenominator to them, which appears
to do the job just fine for the PNG request, and also results in the
correctly empty tile for VectorTile, but it shouldn't be taking so long
to produce them.
Thanks for your help!
On 26/07/17 00:22, Dave Blasby wrote:
Hi, Dylan,
The VT renderer should be taking the min/max scale range into
consideration when querying the underlying data.
Do you have access to a dev environment? If you do, please look
in VectorTileMapOutputFormat#produceMap(). About half way down, you
should see;
Query query = getStyleQuery(layer, mapContent);
This should be taking the min/max scale denominator into consideration.
Questions;
1. what's your SLD
2. what type of data set are you using (postgis? shp?)
3. could you verify that all your CRSes are setup correctly for the
layer and request? (it could be calculating the incorrect map scale)
4. how are your requests setup? Are you using the SLD in #1? Could
you give an example request that directly communicates with the WMS
(that's quick for an image format and slow for a mapbox VT format)?
Thanks,
Dave
------------------------------------------------------------------------
Dylan Parry
Lead Developer, Blue Fox Technology Ltd
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