[Geoserver-users] WMS Response times Web Mercator vs WGS84

Lonnie_M · September 21, 2017, 4:34pm

Hello users,

We were running some WMS performance tests against our image mosaic raster layers and found that performance was significantly slower (almost 40%) when our SRS was Web Mercator (EPSG:3857) compared to WGS84 (EPSG:4326).

Our source data is in NAD83 (2011) UTM. There are more transformation operations going from say EPSG:6341 to EPSG:3857 than EPSG:6341 to EPSG:4326, so I suspect that accounts for the slowness.

My question: is there any suggestions to reduce the response difference?

Thanks.

Lonnie

Jason_Newmoyer · September 22, 2017, 3:19pm

Most likely I’d say the only optimization is to transform your mosaic into the most-used SRS.

···

On Thu, Sep 21, 2017 at 12:34 PM, Lonnie Matsuno <lonnie.matsuno@anonymised.com> wrote:

Hello users,

We were running some WMS performance tests against our image mosaic raster layers and found that performance was significantly slower (almost 40%) when our SRS was Web Mercator (EPSG:3857) compared to WGS84 (EPSG:4326).

Our source data is in NAD83 (2011) UTM. There are more transformation operations going from say EPSG:6341 to EPSG:3857 than EPSG:6341 to EPSG:4326, so I suspect that accounts for the slowness.

My question: is there any suggestions to reduce the response difference?

Thanks.

Lonnie

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Chris_Snider · September 22, 2017, 3:55pm

This is what we did with all our imagery received. We wrote a process to transform everything into 4326 as a standard base. If someone needs the imagery in another projection, that is the one off that we let GeoServer transform on the fly.

If you have a need to supply as rule multiple projections, then you can pre-run the transformations and expose through different workspaces/datastore/layer etc. that is specific to the required projection. This of course causes storage requirements to swell dramatically.

Chris Snider

Senior Software Engineer

Intelligent Software Solutions, A Polaris Alpha Company

···

Most likely I’d say the only optimization is to transform your mosaic into the most-used SRS.

Jason Newmoyer
Newmoyer Geospatial Solutions

843.606.0424

jason@…7364…

On Thu, Sep 21, 2017 at 12:34 PM, Lonnie Matsuno <lonnie.matsuno@…2549…> wrote:

Hello users,

We were running some WMS performance tests against our image mosaic raster layers and found that performance was significantly slower (almost 40%) when our SRS was Web Mercator (EPSG:3857) compared to WGS84 (EPSG:4326).

Our source data is in NAD83 (2011) UTM. There are more transformation operations going from say EPSG:6341 to EPSG:3857 than EPSG:6341 to EPSG:4326, so I suspect that accounts for the slowness.

My question: is there any suggestions to reduce the response difference?

Thanks.

Lonnie

Check out the vibrant tech community on one of the world’s most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot

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

Geoserver-users@lists.sourceforge.net
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