[mapserver-users] Mapscript Rasterquery returns empty
result
Tom van der Putte
tom at vdputte.nl
Wed Jun 2 07:49:07 EDT 2010
Hi Jukka,
Hmmm that does look strange, but as it turns out, removing "LAYER"
didn't help.
Thx anyway ;)
Tom
On Wed 02/06/10 13:23 , "Rahkonen Jukka" Jukka.Rahkonen at mmmtike.fi
sent:
BODY { FONT-SIZE: 12px; FONT-FAMILY: Arial, Helvetica, sans-serif
} Hi, LAYER TEMPLATE "dummy.html"? Does such a thing exist?
Have you tried with plain TEMPLATE "dummy.html"? -Jukka Rahkonen-
-------------------------
Lähettäjä: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta Tom van der
Putte
Lähetetty: 2. kesäkuuta 2010 13:34
Vastaanottaja: Frank Warmerdam; Alexander Petkov
Kopio: mapserver-users at lists.osgeo.org
Aihe: Re: Re: [mapserver-users] Mapscript Rasterquery returns
empty result
Hi Frank, Alexander,
Again thanks for your reply; I've been abroad for a month and
haven't had time to check it out. However, I've ben doing some work
on it today, and tested the following:
I made a test tiff, with 2 large areas surrounded by NoData. When
clicking anywhere in any one of the 2 big areas I get the response:
{"_handle_":Resource id
#47,"numlines":1,"type":0,"index":-1,"tileindex":-1,"classindex":0,"numvalues":8,"text":"","bounds":{"_handle_":Resource
id
#48,"minx":401265.0032,"miny":633815.31,"maxx":401265.0032,"maxy":633815.31},"values":[null,null,null,null,null,null,null,null]}
When I click on any nodata area the response is
Warning: [MapServer Error]: msQueryByPoint(): No matching record(s)
found. in C:ms4wappsfusionMapServerphpGetRasterPoint.php on line 36
Fatal error: [MapServer Error]: msRASTERLayerGetShape(): Out of
range shape index requested. Requested 0 but only 0 shapes available.
in C:ms4wappsfusionMapServerphpGetRasterPoint.php on line 42
This behaviour follows the edges of the areas perfectly. Also I
checked it out with fixed coord pairs, and it doesn't seem te related
to CRS problems. I've also tried IMG instead of TIFF, but no
difference there.
As mentioned, I'm running mapscript 5.2.1, not 5.6. I'm don't know
if this would make a difference, but perhaps someone could test this
for me?
The TIFF I use for testing is available from: BODY { FONT-SIZE:
12px; FONT-FAMILY: Arial, Helvetica, sans-serif }
http://www.vdputte.nl/test_tiff.rar*** For the MAP part of the
mapfile, I use the following (I removed most non-essential
things):
EXTENT -1000000 -1200000 2902206 1773859
IMAGETYPE PNG24
SIZE 600 600
STATUS ON
UNITS METERS
NAME "Test_Map"
PROJECTION
'proj=lcc'
'lat_1=52.67000000000002'
'lat_2=54.33'
'lat_0=48'
'lon_0=10'
'x_0=815000'
'y_0=0'
'ellps=intl'
'units=m'
'no_defs'
END
*** For the test LAYER:
LAYER
NAME "mask"
DATA
"c:/ms4w/Apache/htdocs/data/rasters/depthmaps/tert_msk_rast.img"
TYPE RASTER
STATUS ON
LAYER TEMPLATE "dummy.html"
CLASS
NAME "1"
EXPRESSION ([pixel] == 1)
STYLE
color 255 0 0
END
END
CLASS
NAME "2"
EXPRESSION ([pixel] == 2)
STYLE
color 0 255 0
END
END
END#layer
*** For the querying script I use this:
$szLayer = "mask";
$oLayer = $oMap->getLayerByName($szLayer); //get Layer
$oMap->prepareQuery();
// To be sure no CRS problems arise, I use these coords, smack in
the middle of the left area
$x = 360429;
$y = 642536;
/*
//For NoData, use
$x = 759753;
$y = 935658;
// for a point right between the 2 areas
*/
$oPoint = ms_newPointObj(); //Create Point
$oPoint->setXY($x,$y);
$status = $oLayer->queryByPoint($oPoint, MS_MULTIPLE, 1); //Query
$status = $oLayer->open();
$result = $oLayer->getResult(0); //Get Result
$numResults = $oLayer->getNumResults();
$shape =
$oLayer->getShape($result->shapeindex,$result->tileindex); //
Retrieve shape
echo(var2json($shape)); //echo to browser
Can anybody confirm that they get the same behaviour?
Cheers,
Tom
On Thu 29/04/10 16:07 , Frank Warmerdam warmerdam at pobox.com sent:
Tom van der Putte wrote:
> Hi,
>
> I have the following code:
>
> $oMap->prepareQuery();
> $oPoint = ms_newPointObj();
> $oPoint->setXY($x,$y); //coords received from a AJAX call
>
>
> $oLayer = $oMap->GetLayerByName($szLayer); //Name received
from a AJAX call
> $status = $oLayer->queryByPoint($oPoint, MS_MULTIPLE, 1);
> $status = $oLayer->open();
> $result = $oLayer->getResult(0);
> $numResults = $oLayer->getNumResults();
> $shape =
$oLayer->getShape($result->shapeindex,$result->tileindex);
> echo(var2json($shape));
>
> This results in the follwing json code to be returned:
>
> |{"_handle_":Resource id
#45,"numlines":1,"type":0,"index":-1,
>
> "tileindex":-1,"classindex":0,"numvalues":8,"text":"",
>
> "bounds":{"_handle_":Resource id #46,"minx":607000,
>
> "miny":677000,"maxx":607000,"maxy":677000},
>
> "values":[null,null,null,null,null,null,null,null]}|
>
> No matter what I try, it keeps returning empty shapes. How
can this be?
Tom,
I agree with Alexander that you should be carefully reviewing
your
input coordinate and insuring it is in the same coordinate
system
as the raster file. The returned values are expected if you are
attempting to fetch a non-existant result shape.
If you simplify your test case down as much as you can and you
still
can't figure out why you do not get a result then you could try
to
bundle this up and submit it as a ticket. Keep in mind that
such a
ticket is much more likely to be acted on if you make it *easy*
for
the developer to reproduce your problem.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam,
light and sound - activate the windows |
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