[OpenLayers-Users] Get Feature Info in pop up working example

[Robert Sanson]

Hi
 
GetFeatureInfo requests against Mapserver will not be much different than against ArcGIS WMS. Here is an example:
 
http://mapsvr/cgi-bin/mapserv.exe?map=mylocation&service=wms&version=1.1.1&request=GetFeatureInfo&LAYERS=synlait&QUERY_LAYERS=synlait&INFO_FORMAT=text/plain&SRS=EPSG:2193&BBOX=1492834.61,5131445.29,1493034.61,5131645.29&WIDTH=100&HEIGHT=100&x=50&y=50 

For a single point, just play around with the size of the BBOX, WIDTH, HEIGHT,x & y parameters - make as small or large as you need to ensure you get a single point. You can also specify a TOLERANCE in your mapfile:
 
LAYER
  NAME "synlait"
  GROUP "FMS"
  DATA ../data/nztm/synlait
  SIZEUNITS PIXELS
  STATUS ON
  DUMP TRUE
  # query templates for HTML-based queries
  # responds to OGC:WMS request=GetFeatureInfo......&info_format=text/html
  HEADER   ../templates/synlait_query_header.html
  TEMPLATE ../templates/synlait_query_body.html
  
  # fuzziness for querying
  TOLERANCE 5000
  TOLERANCEUNITS METERS
  TYPE POINT
  UNITS METERS
  # scale range
  MAXSCALE 250000
  MINSCALE 750
  LABELMAXSCALE 100000
  LABELMINSCALE 1
  LABELCACHE on
  LABELITEM 'reference_code'
  CLASS
    STYLE
      COLOR 138 43 226
      OUTLINECOLOR 0 0 0
      SIZE 13
      SYMBOL "triangle"
    END
    LABEL
      TYPE truetype
      FONT "arial"
      SIZE 10
      POSITION ur
      OUTLINECOLOR 235 235 235 #--Halo
      COLOR 0 0 0 
      BUFFER 2
    END #LABEL
  END #CLASS
    
  METADATA
    "wms_group_title" "FMS"
    "wms_name"    "synlait" 
    "wms_title"    "synlait"
    "wms_abstract"    "These are Synlait farms in NZTM"
    "wms_keywordlist"    "AgriBase"
    #"wms_server_version"    "1.1.1"
    "wms_srs"   "EPSG:2193"
    "wms_extent" "1114412.940 4793178.168 2089186.204 6190213.601"
    "wms_dataurl_format" "text/HTML"
    "gml_include_items"     "all"
    "gml_exclude_items"     ""
    "ows_include_items"     "all"
    "ows_exclude_items"     ""  
    "wms_exceptions_format" "application/vnd.ogc.se_xml"
  END
 END #synlait
 
Note: The DATA directive contains the path and name of the Shape file.
The HEADER and TEMPLATE directives reference a couple of html files that format the response to the GetFeatureInfo request when you request &info_format=text/html. If you are just requesting text/plain then you will get all of the attributes.
 
regards,
 
Robert

>>> sunny74 <sb.ray at hotmail.com> 22/03/2010 6:28 p.m. >>>


Hi Robert,

Thanks for your reply.

There are a few doubts about the code:

1) If you taken a single lonlat and then made a bounding box(BBOX) by doing
+- 10.
But what if I want to get the feature info of just one point.What will be
the url in that case?

2) The url is "var regc =
"http://ws-esrimt/arcgis/services/mapservice_asurequality_prod/MapServer/WMSServer?service=WMS&version=1.1.1&request=GetFeatureInfo&QUERY_LAYERS=2&INFO_FORMAT=text/plain&SRS=EPSG:2193&BBOX="
+ bbox1 + "," + bbox2 + "," + bbox3 + "," + bbox4 +
"&WIDTH=20&HEIGHT=20&X=10&Y=10";"

  It seems from the url that you r using ARCGIS with Mapserver. But if I am 
using
only mapserver with openlayers then what is the url?

3) HOw do I make a layers queryable in the map file? What r the extra things
I need to specify?

Pls reply soon.
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