Hi,
I managed to get the UTFGrid working as a tile service from MapServer
(rather than via WMS). I simply had to set the map's image type using
runtime substitution by adding "&map.imagetype=utfgrid" to the
querystring e.g.
mapserv -nh
"QUERY_STRING=map=C:/mapserver-tutorial-data/mapfiles/utf_grid.map&layers=countries&mode=tile&tile=0+0+0&tilemode=gmap&map.imagetype=utfgrid"
I then ran into a further problem. The UTFGrid only returns Unicode
replacement characters so is unusable.
I did some debugging and in the maputfgrid.cpp file there is the
following line:
utf8 = msConvertWideStringToUTF8 (string, "UCS-4LE");
It takes a string such as " ((
77777 " and returns a junk looking
string such as
"øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øŠ€€¨øˆ€€ ø°€ ø°€·ø°€·øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€€ øˆ€"
I'm not sure where the "UCS-4LE" encoding is coming from. I'm running on
a Windows server which could make a difference, however I tried a few
other encodings with no success. The dataset is a shapefile.
Has anyone got the UTFGrid output working on Windows?
Thanks,
Seth
On 18/03/2016 22:54, Seth G wrote:
Hi list,
I'm looking at trying to set up an OpenLayer3 demo using the UTFGrid
format provided by MapServer.
http://mapserver.org/development/rfc/ms-rfc-93.html#rfc93
http://mapserver.org/output/utfgrid_output.html
As luck would have it, it appears OpenLayers2 actually has a better
implementation on the client-side. See links:
http://dev.openlayers.org/examples/utfgrid.html
http://dev.openlayers.org/docs/files/OpenLayers/Layer/UTFGrid-js.html
OL3 seems to require a server-side component to return a callback with
details on the service. Even if I set this up, it expects the UTFGrid
service to use a tile grid format ({x}{y}{z}).
http://openlayers.org/en/v3.14.2/examples/tileutfgrid.html
I can configure MapServer to return UTFGrids using WMS GetMap requests
(as stated in the RFC), but not when using the tile mode -
http://mapserver.org/output/tile_mode.html
I can probably hack together a workaround to work out tile numbers
from BBOXes, but I was wondering if I'm missing something simple to
get this to work directly.
Has anyone manged to set this up?
Thanks for any advice,
Seth
--
web:http://geographika.co.uk
twitter: @geographika
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