Hi,
(Had to clip some text from the bottom because of the size limit of this list)
You do not seem to do anything wrong. Your WMS 1.3.0 EPSG:4326 lat-long
BBOX=42.94,-122.09,42.95,-122.08& gets converted into long-lat order and for
some reason the lower and higher values are equal
{-122.082500,42.942500,-122.082500,42.942500}, thus this is no more a box but a
point.
GetFeatureInfo with a small bbox and width=2 and height=2 is a trick that is
certainly not heavily tested because the corresponding GetMap is pretty odd
despite being valid. Maybe using slightly bigger BBOX makes Mapserver to query
the backend raster with a rectangle instead of a point.
BTW X=1 and Y=1 are not valid in WMS 1.3.0, you are supposed to use i= and j=
instead. That makes me think that maybe you could have a try with a full and
valid WMS 1.1.0 GetFeatureInfo request with SRS= and BBOX in long-lat order and
see if it has any effect on the msProjectRect()
-Jukka Rahkonen-
Lähettäjä: MapServer-users
<[email protected]<mailto:[email protected]>>
Puolesta Carl Godkin
Lähetetty: tiistai 2. marraskuuta 2021 17.06
Vastaanottaja:
[email protected]<mailto:[email protected]>
Aihe: Re: [mapserver-users] Point query from Mapserver raster
Hi,
Following Jukka's advice on my elevation point query, I am trying to use WMS
GetFeatureInfo,
I've mostly got it working but have a few more questions. (I am using MS4W
4.0.5 which includes MapServer 7.7.0)
I added a LAYER to my WMS map file:
LAYER
PROCESSING "RESAMPLE=BILINEAR"
NAME SRTM_3_arc-second_grid
METADATA
"wms_title" "SRTM - 3 arc-second grid"
"ows_extent" "-125 24 -66 50"
"wms_include_items" "all"
END
TYPE RASTER
STATUS ON
TILEINDEX "srtm_3_hgt-index.shp"
TILEITEM "Location"
TEMPLATE "../template.html"
PROJECTION
"init=epsg:4326"
END
END
and an empty template except for the
<!-- MapServer Template -->
line. Here's my query:
http://localhost:8080/wms?
SERVICE=WMS&
VERSION=1.3.0&
REQUEST=GetFeatureInfo&
LAYERS=SRTM_3_arc-second_grid&
CRS=EPSG:4326&
BBOX=42.94,-122.09,42.95,-122.08&
WIDTH=2&
HEIGHT=2&
X=1&
Y=1&
QUERY_LAYERS=SRTM_3_arc-second_grid
This works fine and returns the elevation I am expecting. However, the
MapServer log complains about a "degenerate rect" every time:
[Tue Nov 2 07:58:44 2021].66000 msProjectRect(): Warning: degenerate rect
{-122.082500,42.942500,-122.082500,42.942500}
What am I doing wrong here? As I posted originally, I am really only
interested in a point here.
Thank you very much,
carl
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