No reprojection done

Stephen Woodbridge woodbri at SWOODBRIDGE.COM
Wed Jan 18 07:49:42 PST 2006


Your map is EXTENT 0 0 40 40, how does this compare to the extents of 
you geotiff /var/www/html/india.tif. It is a geotiff or a tiff with a 
wld file right?

-Steve W.

Apeksha Bhambhani wrote:
> 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
>     <mailto: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
>         <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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