[MapProxy] Dealing with a source with multiple resolutions in one layer

[Paul Norman]

I've been trying this, but the layer 

 

- name: bc_best_2009

  sources: [bc_gvrd_east_2009_cache, bc_gvrd_west_2009_cache]

  title: BC best imagery

 

will not show up, either by directly requesting or in the demo service. I
tried running serve-develop and it didn't work with that either.

 

From: Benjamin Wragg [mailto:bwragg at isasolutions.com.au] 
Sent: Sunday, August 12, 2012 1:06 PM
To: Paul Norman
Cc: mapproxy at lists.osgeo.org
Subject: Re: [MapProxy] Dealing with a source with multiple resolutions in
one layer

 

Hi Paul,

 

How did you set up the layer that combined all of them?

 

I combined them all in one layer by just doing the following in my layer
definition:

 

layers:

  name: layer_name

  title: layer description

  sources: [whole_earth_cache, detailed_area1_cache, detailed_area2_cache]

 

As I understand it, with the above setup, if I request the tiles of a
certain area it would:

1) get all the tiles of whole_earth_cache

2) if there are some tiles in detailed_area1_cache it gets all the
corresponding tiles and layers them over the top

3) if there are some tiles in detailed_area2_cache it gets all the
corresponding tiles and layers them over the top

 

so the resulting tile images that get served out are a mix of all 3 caches. 

 

 

Also, when you say you set up a cache for the detailed area, how did you
specify the extent of the detailed area? I don't see anything in the caches
docs about specifying coverage.

 

 

In my setup I precache everything I need as my users run offline without
internet access, so I setup the extent in my seed.yaml. In this file you can
define a coverage like:

 

coverages:

  coverage_of_detailed_area_1

    ogr_datasource: /path to shapefile.shp

    ogr_srs 'EPSG:code_of_projection'

    ogr_where: 'field_name = "my area of interest'

 

 

then in the seed.yaml you can setup a seed that refers to this coverage and
1 for the whole globe:

 

 

seeds:

  detailed_area_1_seed:

     caches:
[name_of_the_cache_you_defined_in_your_mapproxy.yaml_for_the_detailed_area1]

     levels:

       to: 19 #whatever level you want

     coverages: [coverage_of_detailed_area_1]

     refresh_before:

       weeks:52

 

  entire_globe_seed:

     caches:
[name_of_the_cache_you_defined_in_your_mapproxy.yaml_for_the_entire_globe]

     levels:

       to: 20 #whatever level you want

     refresh_before:

       weeks:52

 

 

Then I run mapproxy-seed to pre cache these areas.

 

Regards,

 

Benjamin Wragg

 





From: mapproxy-bounces at lists.osgeo.org
[mailto:mapproxy-bounces at lists.osgeo.org] On Behalf Of Benjamin Wragg
Sent: Tuesday, August 07, 2012 1:24 AM
To: mapproxy at lists.osgeo.org
Subject: Re: [MapProxy] Dealing with a source with multiple resolutions in
one layer

 

 

Hi Paul,

 

I think I had a similar setup problem the other day on this thread "Dealing
with a source with multiple resolutions in one layer". I had 1 source of 19
levels that I wanted to cache at 8 levels all over and then greater levels
over certain regions.

 

Basically to get it to work I did the following:

1.	setup 1 source which had a grid that encompassed the whole earth e.g
GLOBAL_MERCATOR with the maximum number of levels set, for me this was
num_levels 19.
2.	setup 1 cache for the whole earth with a grid of GLOBAL_MERCATOR
with num_levels 8
3.	setup a second cache for "detailed area 1" with a grid of
GLOBAL_MERCATOR with num_levels 14.
4.	setup a third cache for "detailed area 2" with a grid of
GLOBAL_MERCATOR with num_levels 1
5.	....another cache for each area I want more than num_level 8.
6.	In my seed.yaml I have a coverage defined for each of the above
areas and a seed that pre-caches each coverage.

 

Does that make sense? Hope it helps..

 

Regards,

 

Benjamin Wragg

 

On 06/08/2012, at 11:05 AM, Paul Norman < <mailto:penorman at mac.com>
penorman at mac.com> wrote:






I run mapproxy to cache several WMS layers and convert them to TMS. Normally
I set up a layer, a cache using a grid with an appropriate num_levels for
the resolution of the source and a WMS source.

I've run into the case where one of the WMS layers is composed of multiple
imagery shots at different resolution. I would like to cache up to level 21
(zoom 20 in google-style numbering) for parts of it and to 19 in other
parts.

Is this possible? I can get polygons representing the extents of each part
of the layer.

If I use the same grid for the entire area then it could end up caching
unnecessary data in the lower-resolution areas.

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