Ok, so this just a PostGIS-based tiled layer to access GeoTIFF's. You should just be able to do a normal MapServer query.
e.g. http://your.server/cgi-bin/mapserv?map=your.map&mapxy=x+y&qlayer=pm25_monthly&mode=query You'd need to set a TEMPLATE for the pm25_monthly layer. Have you tried that? WMS should work then too but it's simpler to debug using a basic MapServer query. Steve -----Original Message----- From: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Bill Hudspeth Sent: Tuesday, January 06, 2015 8:59 AM To: mapserver-users@lists.osgeo.org Subject: [mapserver-users] Return pixel values from raster layers served by mapserver Hello, I previously wrote about this issue, but have not found a solution yet. I am running Mapserver 6.4.1, and am using Postgres/Postgis to display a time series of geotiff images. I would like to know the best way for a user to submit a given x,y coordinate pair and return the pixel value for a given image. Is this possible using only the mapserver api? or must I absolutely use mapscript? Currently, I use a PostgreSQL/PostGIS time-enabled table to store the information about the location of the geotiffs and the timestamp associated with them: pm25_monthly=# \d pm25_monthly_global Table "public.pm25_monthly_global" Column | Type | Modifiers ----------+-----------------------------+------------------------------- ----------+-----------------------------+---------------- oid | integer | default nextval('pm25_monthly_seq'::regclass) rundate | timestamp with time zone | datetime | timestamp with time zone | location | text | timezone | timestamp without time zone | the_geom | geometry(MultiPolygon,4326) | Indexes: "pm25_monthly_global_oid_key" UNIQUE CONSTRAINT, btree (oid) The 'location' field simply gives the full path to the relevant geotiff on the file system. And, I define the index in the mapfile: #**********LAYER - TILE INDEX FOR PM2.5 RASTERS (Time sensitive)**** LAYER STATUS ON NAME "pm25_time_index" TYPE POLYGON DATA "the_geom from pm25_monthly_global using unique oid using SRID=4326" METADATA "ows_title" "PM25 TIME INDEX" "ows_srs" "EPSG:4326" "ows_extent" "-180 -90 180 90" #[minx][miny][maxx][maxy] "wms_timeformat" "YYYY-MM-DDTHH:MM:SS" "wms_timeextent" "2011-01-01T00:00:00/2012-12-01T00:00:00" "wms_timeitem" "timezone" "wms_timedefault" "2011-01-01T00:00:00" wcs_resolution '0:10 0:10' END #CONNECTION "user=wilbur dbname=pm25_monthly host=localhost password=iiiiiiiiii" #CONNECTIONTYPE postgis CONNECTIONTYPE POSTGIS CONNECTION "host=127.0.0.1 dbname=pm25_monthly user=wilbur password=EUR2_live port=5432" DATA "the_geom from pm25_monthly_global using unique oid using srid=4326" END #*******LAYER - MONTHLY PM2.5 (Time Sensitive)********************************* LAYER NAME 'pm25_monthly' TYPE RASTER STATUS ON DEBUG OFF DUMP TRUE #TRANSPARENCY 50 #FILTER "" METADATA "ows_keywordlist" 'PM2.5 (ug/m3), Global' #wms_keywordlist (Keywordlist) "ows_description" "Global monthly mean PM 2.5 (ug/m3)concentration" "ows_name" "Global monthly mean PM2.5 - Concentration Values (ug/m3)" "ows_label" "Global PM 2.5 (ug/m3)" "ows_srs" "EPSG:4326 EPSG:900913" "ows_extent" "-180 -90 180 90" #[minx][miny][maxx][maxy] "ows_formats" "GEOTIFF" "ows_nativeformat" "8-bit GeoTIF" "ows_timeitem" "timezone" "wms_onlineresource" "http://localhost/cgi-bin/mapserv?map=/var/www/pm25_mapserver/public_html/pm25_ogc_services.map" "wms_abstract" 'Global monthly mean PM 2.5 (ug/m3)concentration' #wms_abstract(Abstract) "wms_opaque" '0' #wms_opaque(layer) "wms_title" "Global monthly mean PM 2.5 (ug/m3)concentration" "ows_timeformat" "YYYY-MM-DDTHH:MM:SSZ" "ows_timeextent" "2011-01-01T00:00:00Z/2012-12-01T00:00:00Z" "ows_timedefault" "2011-01-01T00:00:00Z" "wms_enable_request" "*" "wcs_resolution" "0:10 0:10" "wcs_bandcount" "1" "wcs_size" "3600 1800" layer_name pm25_monthly END #METADATA PROJECTION "init=epsg:4326" #WGS84 Decimal Degrees END #PROJECTION TILEITEM "location" TILEINDEX "pm25_time_index" END #LAYER Thanks _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users