[Portugal] duvidas sobre openlayers

Pedro Costa pedrocostaarma sapo.pt
Terça-Feira, 13 de Dezembro de 2011 - 07:16:15 EST 

Pessoal podem ajudar-me no seguinte:
Tenho esta parte do código:


  var  options  =  {

                     projection:  new  OpenLayers.Projection("EPSG:900913"),

                     units:  "m",

                     numZoomLevels:  22,

                     maxResolution:  156543.0339,

                     maxExtent:  new  OpenLayers.Bounds(-20037508,  -20037508,

                                                      20037508,  20037508.34)

                 };


retirado de: http://www.pgrouting.org/docs/ol-workshop/ch05.html


Significa que o mapa vai estar na projecção 900913. Neste exempo eu 
quero mudar a area a ser apresentada por isso tenho de mudar o maxExtend 
certo?
A questão é se eu no geoserver definir o srs como 900913 e calcular, 
tenho os valores da bounding box,e é so substituir ou estou errado?

Pelo que percebi:

-20037508
(left = min X)


-20037508
(bottom = min y)

20037508

(right = max X)

20037508.34

(top = max y)


Estou correcto?

obrigado








On 13-12-2011 11:11, Jorge de Jesus wrote:
>
> Oi
>
> Pelo que vejo:
>
> 1) Nao tens a proxy instalada para poderes contactar http://localhost:8080
>
> http://trac.osgeo.org/openlayers/wiki/FrequentlyAskedQuestions#HowdoIsetupaProxyHost
>
> Ate teres a proxy instalada o browser nao vai pedir nada ao servidor...
>
> 2) Tens duas vezes projection:
> projection: 'map.getProjectionObject()',
> reproject: 'True',
> projection: new OpenLayers.Projection('4326'),
>
> Geralmente JS usa o ultimo valor definido, portanto estas a usar 
> projeccao 4325
>
> 3) O uso correct the OpenLayers.Projection e' com EPSG
>
> OpenLayers.Projection("EPSG:4326")
>
> All the best
>
> Jorge
>
>
> On 13/12/11 10:50, Pedro Costa wrote:
>> Acho que o problema é mesmo os wms que não são reprojectados:
>> Reparem neste exemplo que fiz:
>>
>>
>> http://pastebin.com/6i9TEWsH
>>
>>
>>
>> Simplesmente não aparece o wms
>>
>>
>>
>>
>>
>> On 12-12-2011 09:38, Jorge de Jesus wrote:
>>>
>>> Bons dias
>>>
>>>
>>> Bem, se tens acerteza que o wms funciona sem problemas  sem o layer 
>>> proprietario, o mais provavel e' que o WMS nao supporta EPSG:900913 
>>> ou gera um erro quando fazes o pedido.
>>>
>>> No firebug, ve os pedidos feitos pela pagina (Seccao Net) e ve o 
>>> pedido feito ao servidor e a resposta data.
>>>
>>> Por exemplo tenho um sistema que faz o seguinte pedido:
>>>
>>> http://localhost/rasdaman/wms.py?LAYERS=rasdamanImage&FORMAT=image%2Fpng&TIME=2011-06-20&STRATEGIES=%5Bobject%20Object%5D&TRANSPARENT=TRUE&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A900913&BBOX=-6300637.7833253,4684889.401321,6076045.8348875,10359574.380423&WIDTH=1265&HEIGHT=580
>>>
>>> Experimenta a fazer um pedido ao teu WMS usando SRS=EPSG%3A900913
>>>
>>> Jorge
>>>
>>>
>>> On 10/12/11 15:25, Pedro Costa wrote:
>>>> Jorge,
>>>>
>>>> Sim lembro-me.Esclarece-me só a seguinte dúvida, o que é que o 
>>>> browser não está a conseguir ir buscar na tua opinião mais 
>>>> precisamente? É que ele vai buscar o layer proprietário, os wms é 
>>>> que não. Mas noutros exercicios que efectuei sem o layer 
>>>> proprietario ele ia buscar tudo.
>>>>
>>>>
>>>> Obrigado
>>>> bom fim de semana
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On 10-12-2011 09:26, Jorge Mendes de Jesus wrote:
>>>>>
>>>>> Oi
>>>>>
>>>>> Parece tudo em ordem, mas tens um ligeiro problema :)
>>>>>
>>>>> Lembras-te da explicacao relativa a cross-domain, ou seja podes 
>>>>> acecer a outros URLs partir de Javascript ?! Pois quando tens um 
>>>>> url com uma porta diferente tens a mesma situacao, ou seja:
>>>>>
>>>>> http://localhost:8080
>>>>>
>>>>> è um URL differente e tens de usar uma proxy para buscar os 
>>>>> resultados. Eu sempre pensei que mesmo com uma porta difererente 
>>>>> nao haveria problemas mas à alguns meses algume teve o mesmo 
>>>>> problema e foi tudo explicado no mailing list, acho que podes 
>>>>> procurar no google pelos emails mais antigos.
>>>>>
>>>>> Alem disso, tens o WMS a funcionar a 100%? Experimentaste a fazer 
>>>>> uma pedido com EPSG:900913 ??
>>>>>
>>>>> Jorge
>>>>>
>>>>>
>>>>> -----Original Message-----
>>>>> From: portugal-bounces  lists.osgeo.org on behalf of Pedro Costa
>>>>> Sent: Fri 09/12/2011 13:47
>>>>> To: portugal  lists.osgeo.org
>>>>> Subject: Re: [Portugal] duvidas sobre openlayers
>>>>>
>>>>> On 09-12-2011 09:22, Jorge de Jesus wrote:
>>>>> > No meu caso nao defino a projeccao da camada WMS e o OpenLayers 
>>>>> usa a
>>>>> > projeccao da baseLayer da google para tudo, o meu WMS tem suporte
>>>>> > nativo para 900913. Acho que devia ter tido mais atencao ao codigo e
>>>>> > seria mais correcto adicionar a informacao da projeccao
>>>>> >
>>>>> > projection: map.getProjectionObject()
>>>>>
>>>>>
>>>>>
>>>>> Tentei assim:
>>>>>
>>>>> http://pastebin.com/WLkRVbxu
>>>>>
>>>>>
>>>>> Mas continuo sem sucesso, só é visivel o layer proprietário. Nem 
>>>>> sequer
>>>>> aparece o "+" do layer switcher, não percebo o porquê...
>>>>>
>>>>> Alguma sugestão?
>>>>>
>>>>> Obrigado
>>>>>
>>>>>
>>>>> PS: O firebug tb não detecta nenhum erro.
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> Plymouth Marine Laboratory
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