No reprojection done
Stephen Woodbridge
woodbri at SWOODBRIDGE.COM
Wed Jan 18 10:49:42 EST 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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