[mapserver-users] tile_map_edge_buffer and python mapscript

[Steve Lime]

Looks like I misspoke. I checked the code and it shows tile_map_edge_buffer
being limited to mode=tile only. I don't think that param has any impact on
the test you referenced.

There's another metadata parameter that is more generally useful with
metatile generation called "labelcache_map_edge_buffer". It reserves space
around the edge of the map to deal with labels at the edge of tiles.
Typically you generate metatiles and then carve them up into actual tiles.
Mode=tile only generates single tiles which limits utility although it has
its place.

I think if you really wanted similar behaviour for your script to mode=tile
you'd have to replicate that logic in your python code - so create a larger
image and then clip out the center. What is your ultimate goal?


On Mon, Apr 5, 2021 at 5:57 PM Baev Alexandr <oldbay at bk.ru> wrote:

> Нi Steve: Тhanks for the answer!
>
> Are there features of activating tile mode for mapscript? Whether it is
> necessary to pass in the request variable *mode=tile* (as mapserv CGI),
> or *TILED=TRUE* (as test in git version
> https://github.com/MapServer/MapServer/blob/main/msautotest/wxs/wms_tiled.map … something
> like a geoserver).
> By simply including metadata tile_map_edge_buffer - tile buffer does not
> work for me.
>
> My Mapfile header (this template):
>
>     MAP
>         NAME "test map"
>         SIZE 1280 1024
>         MAXSIZE 4096
>         UNITS meters
>         IMAGETYPE PNG
>         EXTENT {{extent_x_min}} {{extent_y_min}} {{extent_x_max}}
> {{extent_y_max}}
>         IMAGECOLOR 255 255 255
>         SYMBOLSET "{{symbolset}}"
>         FONTSET "{{fontset}}"
>         WEB
>             METADATA
>                 "tile_map_edge_buffer" "64"
>                 wms_title "test map"
>                 wms_featureinfoformat "text/plain"
>                 wms_srs "EPSG:3857 EPSG:32638 EPSG:4326"
>                 wms_enable_request "*"
>                 wms_encoding "UTF8"
>             END
>         END
>         PROJECTION
>           "init=epsg:{{db_epsg}}"
>         END
>
>     LAYER
>         NAME "test layer"
>         PROCESSING "LABEL_NO_CLIP=True"
>         PROCESSING "CLOSE_CONNECTION=DEFER"
>         EXTENT {{extent_x_min}} {{extent_y_min}} {{extent_x_max}}
> {{extent_y_max}}
>         PROJECTION
>             "init=epsg:{{db_epsg}}"
>         END
>         METADATA
>             wms_title "test layer"
>         END
>         CONNECTIONTYPE postgis
>         CONNECTION "{{db_string}}"
>         DATA "{{query_string}}"
>         STATUS       ON
>         TYPE POLYGON
>
>         ……...
>
> Runing this on python mapscript:
>
>             map_obj = mapscript.mapObj(mapfile) #mapfile described earlier
>             request = mapscript.OWSRequest()
>             mapscript.msIO_installStdoutToBuffer()
>             request.loadParamsFromURL(query_string) #query_string
> — request of web framework
>             status_id = map_obj.OWSDispatch(request)
>             content_type = mapscript.msIO_stripStdoutBufferContentType()
>             result = mapscript.msIO_getStdoutBufferBytes()
>             mapscript.msIO_resetHandlers()
>
> Сan this work in tile mode? Тhanks in advance!
>
> Baev Alexandr
> oldbay at bk.ru <//e.mail.ru/compose/?mailto=mailto%3aoldbay at bk.ru>
>
>
> Вторник, 6 апреля 2021, 0:33 +03:00 от Steve Lime <sdlime at gmail.com>:
>
> Hi Baev: That metadata element is used by the tile mode and by the
> WMS/GetMap code. So a WMS GetMap request though MapScript should make use
> of it. --Steve
>
> On Sun, Apr 4, 2021 at 2:39 PM Baev Alexandr via mapserver-users <
> mapserver-users at lists.osgeo.org
> <//e.mail.ru/compose/?mailto=mailto%3amapserver%2dusers at lists.osgeo.org>>
> wrote:
>
> Mapserver last release version 7.6.2
> Will tile_map_edge_buffer work in python mapscript? Or does it only work
> with mapserv CGI (mode=tile)?
> If it works, what should be done? Additional configuration may be
> required mapscript.OWSRequest() ?
>
> Help me, please!
>
> Baev Alexandr
> oldbay at bk.ru <//e.mail.ru/compose/?mailto=mailto%3aoldbay at bk.ru>
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>
>
> С уважением,
> Baev Alexandr
> oldbay at bk.ru
>
>
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