No reprojection done

[Apeksha Bhambhani]

hii,
  It seems that you have a lot of knowledge about projections in the mapfile . Could you please help us out . We have a few basic doubts. Here's what we are doing ....
   
  We are working on the LAMP platform. We are creating an interactive web application . Users will be provided with a map , on which they can make their own additions and deletions.For example , when a certain user wants to landmark a certain city . 
      Could u help us out with a few of r doubts .
   
   Firstly as the input to the Mapserver will be shapefiles , we will be creating our layers , (Eg. Point , Polygon , etc,) with the help of OpenEV.When the shapfiles are created in OpenEV (for e.g the points layer ) the points are saved on the basis of their line and column value  This input will be given to the Mapfile of the Mapserver , which willl in turn give a complete image comprising of all the layers. This map can then be displayed using Php/Mapscript. 
   When the user enters a certain point , the point details need to be added to MySql. 
   
  We wanted to proceed step by step. Now , as we first need a base map ( on which the user will make his/her changes ) , which will be a raster image ( .png or .tif ). We have created a map file for this( the raster image as a raster layer) as follows: 
   
  MAP
   
  NAME first
  EXTENT 0 0 40 40
  SIZE 600 600
  IMAGECOLOR 200 255 255
  SHAPEPATH "/var/www/html/data1"
   
  WEB
              IMAGEPATH "/var/www/html/tmp/"
              IMAGEURL "/tmp/"
  END 
   
  LAYER 
  NAME "base"
  TYPE raster
  DATA "/var/www/html/india.tif"
  STATUS ON
  END
  END
   
  This is not getting plotted , what could be the problem ? 
  Also , what exactly is the use of extent , because no matter what extent we give for another mapfile to plot a simple rectangle , the size of the rectangle remains the same . 
  Is projection mandatory in the mapfile ? And how can it be used .
  When the shapfiles are created in OpenEV (for e.g the points layer ) the points are saved on the basis of their line and column value  . Does this require the use of projection.How can these points be saved in their latitude/longitude values. 
   We are unable to understand the use of Projection ...Plz can u help us . 
   
  Awating your reply , 
  Apeksha
Ed McNierney <ed at TOPOZONE.COM> wrote:


      Luiz  & Bengt -
   
  I would expect that if Bengt is working with maps of Scandinavian countries, the difference between Plat Carree and Mercator should be noticeable (Mercator will "stretch" things north/south by quite a bit compared to a "geographic" or Plat Carree projection).
   
  Bengt, are you sure you have a good PROJ installation and that MapServer is compiled with PROJ support (run mapserv -v and look for "SUPPORTS=PROJ")?
   
       - Ed
    Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242 


    
---------------------------------
  From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On Behalf Of Luiz Vaz
Sent: Tuesday, January 17, 2006 12:46 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] No reprojection done


  
Well, 

   it seems that there no perceptual changes each other:

# World Mercator
<54004> +proj=merc +lat_ts=0 +lon_0=0 +k=1.000000 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m  no_defs <>

# World Plate Carree
<54001> +ellps=WGS84 +datum=WGS84 +units=m  no_defs <>
# World Equidistant Cylindrical
<54002> +ellps=WGS84 +datum=WGS84 +units=m  no_defs <>

# WGS 84
<4326> +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs  no_defs <> 


Best Regards,
Luiz Vaz

  2006/1/15, Nilsson Bengt <bengt.nilsson at aerotechtelub.se>:   Hi,
I've set up a WMS server with an initial singe layer to test reprojection. However , I can't get the projection to work. Whatever output projection i try I get the same geographical (4326) back. For example, when I make a WMS request  with  SRS=EPSG:54004 (Mercator) and bounding box in that projection I get an 4326-map back. I do not get any errors. Here is my map-file: 

MAP
NAME WMS-test
STATUS ON
SHAPEPATH "shp"
IMAGECOLOR 255 255 255
FONTSET ../etc/fontset.txt

DEBUG ON
WEB
  LOG "/tmp/mapserv.log"
  IMAGEPATH "/srv/www/htdocs/ms_tmp/" 
  IMAGEURL "/ms_tmp/"
  METADATA
    "wms_title"     "Test"
    "wms_onlineresource" "http://hhhhhhhhh/mapserv/wt?service=WMS "
    "wms_srs"       "epsg:9823 epsg:4326 epsg:54004"
  END
END

PROJECTION
  "init=epsg:54004"
END

LAYER
  NAME k92_strandlinje
  DEBUG ON
  METADATA 
    "wms_title"    "k92_strandlinje"
    "wms_srs"    "EPSG:4326"
  END
  TYPE POLYGON
  STATUS ON
  CONNECTIONTYPE postgis
  CONNECTION "user=postgres password=xxx dbname=xxx host=localhost" 
  DATA 'the_geom from k92_strandlin_polygon'
  PROJECTION
   "init=epsg:4326"
  END
  CLASS
    NAME "strandlin-pgx"
    COLOR 255 251 237
    OUTLINECOLOR 100 100 100
  END 
END

END


/Regards Bengt


  


		
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