sexta-feira, maio 19

Entrevista com James Fee do Spatially Adjusted - English version

O post de hoje corresponde ao resultado da entrevista com o idealizador dos sites Spatially Adjusted e Planet Geospatial. Esta entrevista contou com a participação dos analistas de sistemas Glaucio Rocha e Marcos Miranda, que fazem parte do Núcleo de Tecnologia da Informação – NTI da Superintendência de Recursos Hídricos do Estado da Bahia – SRH.

O processo de tradução desta entrevista para o português já foi iniciado e todos terão acesso a ela no próximo post. Desejo uma boa leitura a todos!

James, hi from Brazil. First of all thanks a lot for the chance of this interview. What motivated James Fee to work with GIS and what was the motivation to create the Spatially Adjusted? Do you think that the Spatially Adjusted would become a reference to this new publication world ( “new media” like web, podcast and blog)?

James Fee: I started to get involved with GIS as I graduated from college. I have a BS in Geography and I was working on one of my final cartography projects and happen to see someone turn in a project that wasn't drawn with pen or ink (or even Illustrator or Freehand). I asked how he created such a map and was told it was this program called ArcInfo. I decided then I had to learn more about the program. I got an job at a local city here in Arizona working with ArcInfo and early versions of ArcView. After a while I started to get more involved with GIS development, first with AMLs and later with Visual Basic and .NET as ESRI moved into those markets.

As for the reasons for starting my blog it really comes out of trying to get a better understanding of open source GIS. I figured if I blogged about my issues, people would help (and they did). In the end our company didn't end up going the open source route and we decided to focus back on ESRI so I ended up blogging about ESRI. Honestly I had no idea that so many people would ever find my blog worth reading, but I'm happy to hear so many do. I think at the time I started this blog, most existing GIS portals and "blogs" were full of ads and press reports, not full of much that "ordinary" professional GIS people would really be interested in. I just blog about what interests me and what I think about the geospatial industry and that seems to interest people. My blog has been a blast and I'm glad to see some many more bloggers on Planet Geospatial. It used to be so hard to keep up on GIS news 2 years ago, but now every day my RSS aggregator is full of interesting news and commentary from other GIS professionals. Quite a change from the old print media days.

RG: What do you think motivated the company to abandon the open source route? Do you believe that the open source projects are trustworthy, you know, that they are ready to be used in a large project?

JF: We abandoned open source because our clients didn't want to shift from ESRI software. We thought they would because of reduced licensing costs, but they felt the "safer route" was to stay with ESRI. We never pushed this issue very much and continue to market open source where is makes sense, but our focus remains on ESRI and will probably continue to do so for years to come.

I think open source has proved itself over the past few years being able to handle large enterprise deployments, but of course that depends on the each project and how mature it is. I think eventually open source will make a dent into the professional GIS marketplace, but that will take time as people are educated and the tools become more mature. Many projects are already there and I think the new Open Source Geospatial Foundation will help others get more organized.

RG: We have two Brazilians guys participating in the foundation, they are very confident that open source geospatial “movement” or “industry” will gain projection with the foundation. I would like to know what is your impression about the OSGeo? How do you see ER Mapper as the primary sponsor on GDAL/OGR development and the Autodesk Map Guide Open Source?

JF: To be honest I haven't been following OSGeo as much as I probably should, but from what I've read and heard they have been doing a pretty good job of getting organized. I've been trying to follow the email list, but it has been hard given how busy I am. I kinda wish they would blog about it all rather than use the wiki, but its fine.

I've really got no opinion about either ER Mapper or Autodesk supporting open source. I think it makes a smart business decision to go open source some times and it appears at least in Autodesk's case it was a good idea as MapGuide had really fallen off the radar of many people.I think getting involved with OSGeo early on will make good business sense for those companies that have "signed" on and those who aren't involved yet will be left outside looking in as the whole open source GIS begins to gel. Interoperability is key for the future and closed platforms will slowly die off (proprietary or not).

RG: Many DBMS are starting to store geometry objects and these applications are growing on spatial functionalities. Nowadays it’s possible to develop a WEBGIS based on a spatial database structure. Do you believe that GIS platforms (Arcview, Mapinfo or Geomedia) like they are today are near to death?

JF: I think the general movement is toward server-based GIS. I don't think that desktop GIS will go away, but enterprise customers will probably migrate much of their geoprocessing to servers, allowing companies to spend much less money on full copies of ArcGIS (for example) on everyone's desk. A client such as Google Earth can display server data, the only missing link is a framework to program tasks within these clients that would connect to the servers. I think ArcGIS Explorer might be this client, but we aren't there yet.

Of course there will always be the small GIS shops that cannot afford the high cost of server GIS (given the small number of seats they have) so "stand alone" desktop GIS applications such as Geomedia or ArcGIS will always be around.

RG: I really believe it. On the route of Google Earth, Yahoo! Maps and Microsoft Virtual Earth, why ESRI is so slow on launching the ArcGIS Explorer? Is there still enough time for ArcGIS Explorer to compete with these applications? Are there other differences between ArcGIS Explorer and the “standard” Google Earth?

JF: Many people think ESRI is being slow about getting ArcGIS Explorer (AGX) out the door.I can't say anything about specific issues ESRI might be having (because I don't know), but I think the schedule has more to do with the ArcGIS 9.2 Beta release schedule than anything the AGX team might be doing. This brings us to the point why AGX is important given the huge install base of Google Earth (GE).

First, AGX is a similar application to GE as both are "globe applications", but that is where they begin to differ. First off while Google Earth is free for personal use, you must buy a pro version to use it with work. That makes it very hard for consultants like ourselves to deploy GE solutions to our customers (who might have GE on their computers, but only a personal license). AGX will be free for anyone to download and install (consumer or pro) so you don't have to worry about what license people have. GE includes some great imagery of the world and I don't think ESRI will even begin to try and compete on that level. ESRI announced at the Dev Summit that they would have 1m imagery for the USA available, but they didn't announce if any more countries will be available. So if you are into sightseeing, I'm sure GE will always trump AGX, but that is OK because of the next big difference. AGX can connect to ArcGIS Server, ArcIMS and WMS services so even if you are working in an area that doesn't have good coverage, you can set up your own web mapserver (even UMN Mapserver) to fill in the gaps. AGX will have complete support for KML/KMZ so you'll be able to use the huge selection of existing files. Another huge feature for AGX is the new task framework. ESRI has shown some demos on their main website showing how you can create tasks inside AGX (using .NET) that can perform GIS analysis on your data layers. What this means is if you have an ESRI backend server, you'll be able to take advantage of the capabilities of that server and allow users of AGX to perform their analysis right from inside AGX. The possibilities of this are endless and many more users will be able to take advantage of a professional GIS without having to pay for a full blown GIS system. Plus they'll be using a GUI that is similar to both GE and existing ArcGIS applications so it will all feel very familiar.

I guess if you look at AGX as a competitor to GE, then I guess I'd say it is too late for AGX to overtake Google. But, I don't think ESRI looks at AGX that way and isn't in the consumer marketplace that Google competes in. AGX is a tool that will take the globe application in a different direction from GE and hopefully to the benefit of GIS professionals.

RG: James, this is our last question and I am very happy with this interview and all your answers. It is my first interview and in my opinion you are doing a good job with Spatially Adjusted and Planet Geospatial. Keep up the good work! Could you give us one last opinion about the “future” of GIS Industry – what will it be like in the next four years?

JF: I think we'll see a movement back to "server-side GIS" and away from desktop GIS. No long is GIS confined to 1 or 2 people in a group. Everyone needs access to perform the same kinds of analysis that you used to need a GIS professional to accomplish. But at the same time the tools need to become simpler. I think we've seen this start with ArcView GIS 3.x, then ArcGIS and now Google Earth. Eventually we'll not even need a stand alone Google Earth type application, but just a web browser and a mouse.

Of course the world will still need GIS professionals to keep these systems up and running, develop datasets and develop the models needed to perform GIS analysis.


Importação de annotation de arquivos CAD - Parte II

By Rafhael Bussolo
5º Passo: Acesse a caixa de diálogo Join Data, através do menu de contexto, opção Join and Relates, opção Join. Faça a configuração que é mostrada na figura a seguir.

6º Passo: Será criado um novo arquivo que é resultado da união das duas feições. Observe as duas figuras a seguir, antes e depois da união. Note que na figura antes da união temos apenas uma coluna chamada Text, além das colunas padrões do arquivo shapefile. Já na figura depois da união, note que aparecem várias colunas. Estas colunas são da união da feição Annotation. Note também que existe uma coluna Text_1. Nessa coluna você irá encontrar a informação de annotation que você precisa. Na maioria dos casos a annotation será incluida sempre nessa coluna, porém, é recomendável verificar nas outras também.

Tabela de atributos antes da união.
Tabela de atributos depois da união.
7º Passo: O seu arquivo shapefile está pronto para ser trabalhado. Agora já é possível configurar o sistema de coordenadas.

Espero que esse tutorial possa ajudar a compreender melhor as uniões e os relacionamentos que podemos fazer com o ArcGIS.

Caso tenha alguma dúvida mande uma mensagem para Rafhael Bussolo. Lembre-se que a sua dúvida poderá ser a mesma de outro amigo e dessa forma concentramos as respostas para melhorar o tutorial, certo!!??

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terça-feira, maio 16

Importação de annotation de arquivos CAD - Parte I

Esse post foi uma contribuição do Rafhael Bussolo do FórumGIS. Muito obrigado por este tutorial! Enquanto isso estou em pleno processo de entrevista com James Fee do Spatially Adjusted.

By Rafhael Bussolo
Nesse tutorial veremos como é possível importar informações de anotação (annotation) de arquivos CAD para arquivos shapefile. Esse processo de importação também é válido para importar annotation para geodatabases.

1º Passo: Certifique-se de que as informações annotation estejam contidas nos polígonos de sua referência. Caso existam anotações fora dos polígonos a importação poderá ser comprometida. Certifique-se também de que não haja nenhuma outra anotação como: títulos, legendas, etc.

2º Passo: Abra o arquivo CAD no ArcMap. Para ganhar tempo e manter o trabalho limpo, abra apenas a feição que contém a informação de polígono, linha e annotation. Verifique se todos os polígonos estão aparecendo, pois eles podem não terem sido fechados no arquivo de origem e assim, o ArcGIS não entenderá ele como polígono e consequentemente não o desenhará.

3º Passo: Exporte a feição polygon para shapefile através da opção Export Data.
Importante: não mexa na configuração do sistema de coordenadas depois de criar o shapefile. Esse processo tem como base o relacionamento espacial, você não consegue relacionar uma feição sem coordenadas com outra com coordenadas.

4º Passo: Através do menu Join and Relates, opção Join, você fará o relacionamento entre as feições. Antes, verifique a tabela de atributos do shapefile criado, apague algumas colunas para facilitar o trabalho posteriormente. Tome cuidado para não apagar colunas que você poderá necessitar.

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