mobile and gis dev notes

[root@rupert-linux ~]# python
Python 2.3.4 (#1, Mar 10 2006, 06:12:09) [GCC 3.4.5 20051201 (Red Hat 3.4.5-2)] on linux2 Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> print sys.path
['', '/usr/lib/python23.zip', '/usr/lib/python2.3', '/usr/lib/python2.3/plat-linux2', '/usr/lib/python2.3/lib-tk', '/usr/lib/python2.3/lib-dynload', '/usr/lib/python2.3/site-packages',
'/usr/lib/python2.3/site-packages/PIL',
'/usr/lib/python2.3/site-packages/gtk-2.0']
>>>

     41         var options = {
     42                         controls: [new OpenLayers.Control.MouseDefaults()]
     43                       };
     44
     45         map = new OpenLayers.Map( $('map'), options);
     46
     47         var layer_base = new OpenLayers.Layer.WMS(
     48                     "Base Layer",
     49                     "#request.mapserv_tile#",
     50                     {
     51                         map: '/home/map/beijing/new/wms.map',
     52                         layers: '#request.basemap_tile#',
     53                         format: 'image/png', 'transparent': 'false'
     54                     }
     55                     );
     56
     57         var layer_road = new OpenLayers.Layer.WMS(
     58                     "Road Layer",
     59                     "#request.mapserv_tile#",
     60                     {
     61                         map: '/home/map/beijing/new/wms.map',
     62                         layers: '#request.roads_tile#',
     63                         format: 'image/png', 'transparent': 'true'
     64                     },
     65                     {
     66                         reproject: false
     67                     }
     68                     );
     69
     70         map.addLayer(layer_base);
     71         layer_base.setIsBaseLayer(true);
     72
     73         layer_road.setIsBaseLayer(false);
     74         map.addLayer(layer_road);

     47 [basemap]
     48 type=WMSLayer
     49 url=http://127.0.0.1/cgi-bin/mapserv?map=/home/map/beijing/new/wms.map
     50 layers=district,greens,major_river,minor_river
     51 #bbox=-180,-90,180,90
     52 #metaTile=true
     53 extension=png
     54
     55 [roads]
     56 type=WMSLayer
     57 url=http://127.0.0.1/cgi-bin/mapserv?map=/home/map/beijing/new/wms.map
     58 #layers=road4,road4label,road3,road3label,road2,road2label,road1,road1label,road11,road11label
     59 #bbox=116.1737,39.8211,116.5640,40.0799
     60 #maxresolution=1.40625
     61 #bbox=-180,-90,180,90
     62 layers=road1,road1label,road11,road11label
     63 extension=png
     64 #metaTile=true

OUTPUTFORMAT
     NAME png
     DRIVER "GD/PNG"
     MIMETYPE "image/png"
     IMAGEMODE RGB
     EXTENSION "png"
     FORMATOPTION "INTERLACE=OFF"
END

 
    MAX_ZOOM_LEVEL: 22,
 
    /** Hardcode these resolutions so that they are more closely
     *   tied with the standard wms projection
     *
     * @final @type Array(float) */
/*    RESOLUTIONS: [1.40625,0.703125,0.3515625,0.17578125,0.087890625,0.0439453125,0.02197265625,0.010986328125,0.0054931640625,0.00274658203125,0.001373291015625,0.0006866455078125,0.00034332275390625,0.000171661376953125,0.0000858306884765625,0.00004291534423828125],*/
 
RESOLUTIONS:[1.40625,0.703125,0.3515625,0.17578125,0.087890625,0.0439453125,0.02197265625,0.010986328125,0.0054931640625,0.00274658203125,0.001373291015625,0.0006866455078125,0.00034332275390625,0.000171661376953125,0.0000858306884765625,0.00004291534423828125,0.0000214576721191140625,0.000107288360595703125,0.0000053644182978515625,0.000002682209014892578125,0.0000013411045074462890625,0.00000067055225372314453125],

From crschmidt at metacarta.com  Wed Nov 22 17:54:29 2006
From: crschmidt at metacarta.com (Christopher Schmidt)
Date: Wed, 22 Nov 2006 17:54:29 -0500
Subject: [OpenLayers-Users] TileCache - Tiling issues
In-Reply-To: <4564D326.6020607@refractions.net>
References: <4564D326.6020607@refractions.net>
Message-ID: <20061122225429.GA18180@metacarta.com>
 
On Wed, Nov 22, 2006 at 02:45:58PM -0800, Ben Brehmer wrote:
> Hello everyone,
>
> I have setup a basic OpenLayers application with TileCache doing the
> server-side caching. I was wondering if there is a way to pre-cache all
> the tiles (besides panning/zooming everywhere on the map)? I know in
> kamap there is a script that can be run to pre-cache all the tiles. Is
> there something similair for TileCache?
 
In the TileCache directory, there is a 'Client.py' script. To pre-cache
your data, use it in the following manner:
 
python Client.py "http://example.com/tilecachelocation/tilecache.cgi?"
"layername" startzoomlevel endzoomlevel [BBOX]
 
Something like:
 
python Client.py "http://labs.metacarta.com/wms-c/Basic.py?" "basic" 0 16
 
Is what we used to precache all of the Vmap0 data in the MetaCarta VMap0
layer.
 
> Also, I have attached two jpegs. Each has part of a symbol or label
> chopped off. I believe that the "chopping" occurs at the edge of a tile.
> Has anyone ever experience something like this in OpenLayers?
 
This is based on your Mapserver setup, rather than something specific in
OpenLayers. Using WMS would result in the same visual result. Labels can
have this prevented using the "PARTIALS OFF" on your label layer, if
you're using Mapserver. I'm not aware of a way to prevent this in symbol
generation. 
 
We are currently working on ka-map style rendering to add to TileCache,
to help people not run into this issue. No timeframe available yet on
when that'll be released. 
 
Regards,
--
Christopher Schmidt
MetaCarta

[cache]
type=DiskCache
base=E:\\usr\\local\\apache2\\htdocs\\tmp\\
 
[basemap]
type=WMSLayer
url=http://127.0.0.1/cgi-bin/mapserv.exe?map=/home/basemap/wmstest_longlat.map
layers=district,greens,major_river,minor_river
extension=png
 
[roads]
type=WMSLayer
url=http://127.0.0.1/cgi-bin/mapserv.exe?map=/home/basemap/wmstest_longlat.map
layers=road4,road4label,road3,road3label,road2,road2label,road1,road1label,road11,road11label
extension=png

    <cfset request.mapserv="http://127.0.0.1/tilecache/tilecache.py"> 
 
    <script src="/OpenLayers-2.2/lib/OpenLayers.js"></script>
    <script type="text/javascript"></script>
        <!--<br /-->        //var lon = 116.3842;
        //var lat = 39.9150;
        var lon = 116.3846;
        var lat = 39.9202;
        var zoom = 16;
        var map, markers;
 
        function init(){
      	    map = new OpenLayers.Map( $('map'), { maxResolution: 'auto'});
 
	    var layer_base = new OpenLayers.Layer.WMS(
					"Base Layer",
					"#request.mapserv#",
					{
						layers: 'basemap',
						format: 'png', 'transparent': 'off'
					}
					);
 
                map.addLayer(layer_base);
	   layer_base.setIsBaseLayer(true);	
 
               ...more code here...
 
       }
</cfset>