[Mapserver-users] QueryByPoint using Java/MapScript returns no results
Umberto Nicoletti
unicoletti at prometeo.it
Wed Mar 31 08:31:37 EST 2004
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Hi list,
I am using Java mapscript to build a demo application using the itasca
map. I have had some success zooming/panning, but now I am stuck with
querying.
I am running on Linux, with mapserver 4.0, java 1.4.1.
This is the code snippet that performs the query:
private void queryLayer(int i, pointObj queryPoint) {
layerObj layer=map.getLayer(i);
if (layer!=null && isVisible(layer) ) {
if ( layer.open() == mapscript.MS_SUCCESS ) {
if (log.isDebugEnabled()) {
log.debug("Querying layer: "+layer.getName());
}
if (
layer.queryByPoint(map,queryPoint,mapscript.MS_MULTIPLE,0) ==
mapscript.MS_SUCCESS ) {
resultCacheObj resultCache = layer.getResultcache();
for (int j=0;j<resultCache.getNumresults();j++) {
if (log.isDebugEnabled())
log.debug("Layer "+layer.getName()+", result
number:"+j);
resultCacheMemberObj
resultMember=layer.getResult(j);
//shapeObj shape=new
shapeObj(mapscript.MS_SHAPE_NULL);
shapeObj shape=new shapeObj(layer.getType());
layer.getShape(shape,resultMember.getTileindex(),resultMember.getShapeindex());
if (shape!=null) {
log.debug("Shape.text="+shape.getText());
log.debug("Shape "+j+"
numValues="+shape.getNumvalues());
for (int z=0;z<shape.getNumvalues();z++) {
log.info("Shape.value["+z+"]="+shape.getValue(z));
}
} else {
log.error("Shape "+j+" is null!");
}
}
} else {
log.warn("Query on layer "+layer.getName()+"
failed.");
}
layer.close();
} else {
log.warn("Cannot open layer "+layer.getName()+" vfor
query");
}
}
}
There is an outer loop on all layers of course, but that is not shown.
And this is the output I get in my logs:
DEBUG [http8080-Processor4] (?:?) - Map point is:
(444126.024361375,5236694.413626128)
DEBUG [http8080-Processor4] (?:?) - Querying layer: ctybdpy2
WARN [http8080-Processor4] (?:?) - Query on layer ctybdpy2 failed.
DEBUG [http8080-Processor4] (?:?) - Querying layer: mcd90py2
WARN [http8080-Processor4] (?:?) - Query on layer mcd90py2 failed.
DEBUG [http8080-Processor4] (?:?) - Querying layer: twprgpy3
WARN [http8080-Processor4] (?:?) - Query on layer twprgpy3 failed.
DEBUG [http8080-Processor4] (?:?) - Querying layer: lakespy2
DEBUG [http8080-Processor4] (?:?) - Layer lakespy2, result number:0
DEBUG [http8080-Processor4] (?:?) - Shape.text=null
DEBUG [http8080-Processor4] (?:?) - Shape 0 numValues=0
DEBUG [http8080-Processor4] (?:?) - Querying layer: dlgstln2
WARN [http8080-Processor4] (?:?) - Query on layer dlgstln2 failed.
DEBUG [http8080-Processor4] (?:?) - Querying layer: ctyrdln3
WARN [http8080-Processor4] (?:?) - Query on layer ctyrdln3 failed.
DEBUG [http8080-Processor4] (?:?) - Querying layer: majrdln3
WARN [http8080-Processor4] (?:?) - Query on layer majrdln3 failed.
DEBUG [http8080-Processor4] (?:?) - Querying layer: majrdln3_anno
WARN [http8080-Processor4] (?:?) - Query on layer majrdln3_anno failed.
DEBUG [http8080-Processor4] (?:?) - Querying layer: airports
WARN [http8080-Processor4] (?:?) - Query on layer airports failed.
DEBUG [http8080-Processor4] (?:?) - Querying layer: cities
WARN [http8080-Processor4] (?:?) - Query on layer cities failed.
What it looks to me is that it finds (correctly) a shape, but the shape
hasn't any attribute attached.
Please note that the same code works on the Europe map from the php
mapscript by example.
What am I doing wrong?
I attach my demo.map.
Thanks for your help,
Umberto
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Content-Disposition: attachment; filename=mydemo.map
Content-Type: text/plain; name=mydemo.map; charset=iso-8859-15
Content-Transfer-Encoding: 7bit
#
# Start of map file
#
NAME DEMO
STATUS ON
SIZE 600 600
EXTENT 388107.634400379 5203120.88405952 500896.339019834 5310243.30613897
UNITS METERS
SHAPEPATH "/home/unicoletti/Workspace/Java/mapServer/resources/itasca/data"
IMAGECOLOR 255 255 255
# you may need to change this to match your MapServer build
IMAGETYPE PNG
#
# Projection definition, consult the PROJ.4 documentation for parameter discussion
#
#PROJECTION
# "proj=utm"
# "ellps=GRS80"
# "zone=15"
# "north"
# "no_defs"
#
# OR:
#
# "init=epsg:26915"
#END
#
# Start of web interface definition (including WMS enabling metadata)
#
WEB
HEADER demo_header.html
TEMPLATE demo.html
FOOTER demo_footer.html
MINSCALE 1000
MAXSCALE 1550000
IMAGEPATH "set in demo_init.html"
IMAGEURL "set in demo_init.html"
METADATA
WMS_TITLE "UMN MapServer Itasca Demo"
WMS_ABSTRACT "This is the UMN MapServer demonstration application for Itasca County located in north central Minnesota."
WMS_ACCESSCONSTRAINTS none
# change this value to match your setup
WMS_ONLINERESOURCE "http://localhost.localdomain/mapserver_demos/itasca/demo_init.html"
WMS_SRS "EPSG:26915"
END
END
QUERYMAP
SIZE 200 200
STATUS ON
STYLE HILITE
COLOR 255 0 0
END
#
# Start of reference map
#
REFERENCE
IMAGE /home/unicoletti/Workspace/Java/ms/WEB-INF/maps/itasca/graphics/reference.png
EXTENT 393234.393701263 5205405.16440722 495769.579718949 5307959.02579127
SIZE 120 120
STATUS ON
COLOR -1 -1 -1
OUTLINECOLOR 255 0 0
END
#
# Start of legend
#
LEGEND
KEYSIZE 18 12
LABEL
TYPE BITMAP
SIZE MEDIUM
COLOR 0 0 89
END
STATUS ON
END
#
# Start of scalebar
#
SCALEBAR
IMAGECOLOR 255 255 255
LABEL
COLOR 255 255 255
SIZE tiny
END
STYLE 1
SIZE 80 2
COLOR 255 255 255
UNITS MILES
INTERVALS 1
TRANSPARENT TRUE
STATUS TRUE
END
#
# Start of symbol definitions (we're only using a few)
#
SYMBOL
NAME 'circle'
TYPE ELLIPSE
POINTS 1 1 END
FILLED TRUE
END
#
# Start of layer definitions
#
LAYER
NAME ctybdpy2
TYPE POLYGON
STATUS DEFAULT
DATA ctybdpy2
CLASSITEM 'cty_name'
CLASS
EXPRESSION 'Itasca'
OUTLINECOLOR 128 128 128
COLOR 225 225 185
END
CLASS # every other county in the state
EXPRESSION /./
OUTLINECOLOR 128 128 128
COLOR 255 255 255
END
METADATA
WMS_TITLE "County Boundary"
WMS_ABSTRACT "Itasca County boundary shapefile. See http://deli.dnr.state.mn.us/metadata/full/ctybdne2.html for more information."
WMS_SRS "EPSG:26915"
END
END
LAYER
NAME mcd90py2
GROUP cities
TYPE POLYGON
DATA mcd90py2
STATUS OFF
CLASSITEM city_name
CLASS
NAME "Cities & Towns"
EXPRESSION /./
COLOR 255 225 90
TEMPLATE "mcd90py2.html"
END
HEADER "mcd90py2_header.html"
FOOTER "mcd90py2_footer.html"
DUMP TRUE # allow GML export
METADATA
WMS_TITLE "Minor Civil Divisions"
WMS_ABSTRACT "Minor civil divisions for Itasca County. (boundaries only)"
WMS_SRS "EPSG:26915"
END
END
LAYER
NAME twprgpy3
TYPE POLYGON
DATA twprgpy3
STATUS OFF
CLASS
SYMBOL 'circle'
SIZE 2
NAME 'Townships'
OUTLINECOLOR 181 181 145
END
METADATA
WMS_TITLE "Township Boundaries"
WMS_ABSTRACT "Pulic Land Survey (PLS) township boundaries for Itasca County. See http://deli.dnr.state.mn.us/metadata/full/twprgne2.html for more information."
WMS_SRS "EPSG:26915"
END
END
LAYER
NAME lakespy2
TYPE POLYGON
STATUS OFF
DATA lakespy2
CLASS
NAME 'Lakes & Rivers'
TEMPLATE "lakespy2.html"
COLOR 49 117 185
END
HEADER "lakespy2_header.html"
FOOTER "lakespy2_footer.html"
TOLERANCE 3
DUMP TRUE # allow GML export
METADATA
WMS_TITLE "Lakes and Rivers"
WMS_ABSTRACT "DLG lake and river polygons for Itasca County. See http://deli.dnr.state.mn.us/metadata/full/dlglkpy2.html for more information."
WMS_SRS "EPSG:26915"
END
END # lakes
LAYER
NAME dlgstln2
TYPE LINE
STATUS OFF
DATA dlgstln2
CLASS
NAME "Streams"
TEMPLATE "dlgstln2.html"
COLOR 49 117 185
END
HEADER "dlgstln2_header.html"
FOOTER "dlgstln2_footer.html"
TOLERANCE 5
DUMP TRUE # allow GML export
METADATA
WMS_TITLE "Streams"
WMS_ABSTRACT "DLG streams for Itasca County. See http://deli.dnr.state.mn.us/metadata/full/dlgstln2.html for more information."
WMS_SRS "EPSG:26915"
END
END # streams
LAYER
NAME ctyrdln3
GROUP roads
MAXSCALE 300000
STATUS OFF
DATA ctyrdln3
TYPE LINE
CLASS
COLOR 0 0 0
END
METADATA
WMS_TITLE "County Roads"
WMS_ABSTRACT "County roads. (lines only) Derived from MNDOT roads layer, see http://deli.dnr.state.mn.us/metadata/full/dotrdln2.html for more information."
WMS_SRS "EPSG:26915"
END
END # county roads
LAYER
NAME majrdln3
GROUP roads
MAXSCALE 600000
STATUS OFF
DATA majrdln3
TYPE LINE
CLASS
NAME "Roads"
COLOR 0 0 0
END
METADATA
WMS_TITLE "Highways"
WMS_ABSTRACT "Highways- state, US and interstate. (lines only) Derived from MNDOT roads layer, see http://deli.dnr.state.mn.us/metadata/full/dotrdln2.html for more information."
WMS_SRS "EPSG:26915"
END
END # highways
LAYER
NAME majrdln3_anno
GROUP roads
MAXSCALE 600000
STATUS OFF
DATA majrdln3
TYPE ANNOTATION
LABELITEM "road_num"
CLASSITEM "road_class"
CLASS
EXPRESSION "3"
COLOR 0 0 0 # dummy color
SYMBOL 'symbols/sthwy.png'
LABEL
MINFEATURESIZE 50
MINDISTANCE 150
POSITION CC
SIZE TINY
COLOR 0 0 0
END
END
CLASS
EXPRESSION "2"
COLOR 0 0 0 # dummy color
SYMBOL 'symbols/ushwy.png'
LABEL
MINFEATURESIZE 50
MINDISTANCE 150
POSITION CC
SIZE TINY
COLOR 0 0 0
END
END
CLASS
EXPRESSION "1"
COLOR 0 0 0 # dummy color
SYMBOL 'symbols/interstate.png'
LABEL
MINFEATURESIZE 50
MINDISTANCE 150
POSITION CC
SIZE TINY
COLOR 255 255 255
END
END
METADATA
WMS_TITLE "Highways"
WMS_ABSTRACT "Highways- state, US and interstate. (shields only) Derived from MNDOT roads layer, see http://deli.dnr.state.mn.us/metadata/full/dotrdln2.html for more information."
WMS_SRS "EPSG:26915"
END
END # highway annotation
LAYER
NAME airports
TYPE POINT
DATA airports
STATUS OFF
CLASS
NAME 'Airports'
COLOR 128 255 164
SYMBOL 'circle'
SIZE 7
TEMPLATE "airports.html"
END
HEADER "airports_header.html"
FOOTER "airports_footer.html"
TOLERANCE 5
METADATA
WMS_TITLE "Airports"
WMS_ABSTRACT "Airport runways for Itasca County."
WMS_SRS "EPSG:26915"
END
END
LAYER
NAME mcd90py2_anno
NAME cities
TYPE ANNOTATION
DATA mcd90py2
STATUS OFF
LABELITEM "city_name"
CLASSITEM "city_name"
LABELMAXSCALE 500000
CLASS
EXPRESSION /./
COLOR -1 -1 -1
LABEL
COLOR 0 0 0
SHADOWCOLOR 218 218 218
SHADOWSIZE 2 2
TYPE BITMAP
SIZE MEDIUM
POSITION CC
PARTIALS FALSE
BUFFER 2
END
END
METADATA
WMS_TITLE "Minor Civil Divisions"
WMS_ABSTRACT "Minor civil divisions for Itasca County. (annotation only)"
WMS_SRS "EPSG:26915"
END
END
END # Map File
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