Hi,
Please read
https://mapserver.org/optimization/tileindex.html#tileindex-mixed-srs and
https://mapserver.org/development/rfc/ms-rfc-100.html?
-Jukka Rahkonen-
Lähettäjä: mapserver-users <mapserver-users-boun...@lists.osgeo.org> Puolesta
Peter Schmitt
Lähetetty: perjantai 15. marraskuuta 2019 21.02
Vastaanottaja: mapserver-users@lists.osgeo.org
Aihe: [mapserver-users] Configuring a layer with one output with multiple input
projections
Hi,
Is it possible to configure one raster layer with a single output projection
(epsg:4326) where input rasters are in different UTM zones? I'd like to avoid
reprojecting the source data if possible.
The rasters will be determined from a Postgis-based tile index where raster
extents are stored in epsg:4326. The database will also track what UTM zone the
source raster is in. Is it possible to pass this projection info from the
database to the PROJECTION block?
I tried an experiment which does not quite work. I built a tile index with two
tifs in different UTM zones:
gdaltindex -t_srs EPSG:4326 test_tindex.gpkg zone45.tif zone46.tif
Then my layers are:
LAYER
NAME "test_tindex"
TYPE POLYGON
CONNECTIONTYPE OGR
CONNECTION "test_tindex.gpkg"
STATUS OFF
PROJECTION
# proj4 config for +init=epsg:4326
http://spatialreference.org/ref/epsg/wgs-84/
"+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"
END
CLASS
STYLE
WIDTH 2
OUTLINECOLOR 0 255 0
END
END
END
LAYER
NAME "test"
TYPE RASTER
METADATA
"ows_title" "test"
"ows_srs" "EPSG:4326 EPSG:3857"
END
TILEINDEX "test_tindex"
STATUS OFF
PROJECTION
AUTO
END
END
When I make a WMS request for test in an area where the images overlap, it
seems MapServer stops rendering rasters after the first image in the tile index
is found... so in this case since zone45.tif was the first image in the tile
index, that's what I see for a request bbox in the overlap region. If I swap
the order of files in the command to build the tindex, the overlapped area only
shows me zone46.tif.
$ mapserv -v
MapServer version 7.2.2 OUTPUT=PNG OUTPUT=JPEG SUPPORTS=PROJ SUPPORTS=AGG
SUPPORTS=FREETYPE SUPPORTS=ICONV SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER
SUPPORTS=WFS_SERVER SUPPORTS=WCS_SERVER SUPPORTS=FASTCGI SUPPORTS=GEOS
SUPPORTS=PBF INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE
Thanks,
Pete
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