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in a project I am doing, there is a need to combine data from different sources into a GIS and show it in one map. The data could be from ERP system like SAP or other sources. which tool could be used for combining different data sources in GIS? which software would be the best? I am thinking about Geoserver or Geomajas?

Thank you for any response

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You need to be much more specific. Any good GIS will allow you to load your data from a number of sources, be they databases, spreadsheets or standalone spatial files. – GIS-Jonathan Oct 29 '12 at 11:11
If you have a vast array of different datatypes and sources FME is a good bet to convert everything to a standard format and perform spatial operations on the results. – sgrieve Oct 29 '12 at 11:21
Do you need to show it in an online map, handheld device, and/or desktop computer? Is the data online or local? Do the data need to be parsed / interpreted live and displayed in a certain way, or "combined from different sources" once and then shown statically? – Simbamangu Oct 29 '12 at 12:10
the GIS should be integrated through an interface to the existed web-based business process management software from the company. It should be able to show the area of different suppliers(energy, atomic reactors...)in one map and compare the historical data from them. – Lala Oct 29 '12 at 12:32
To get help here at GIS.stackexchange (and there is a lot of terrific help available) you need to be more specific about the data types - especially giving examples - and specific about exactly what processes and methods you need help with. Questions here need to be phrased such that they have clear possible solutions ... you may want to rephrase this with more information, especially the nature of the web-based software and the underlying data types. – Simbamangu Oct 29 '12 at 16:33

The short version is - Seek professional help.

The longer version: You appear to have some vague knowledge of what you want to do but certainly don't have the specifics. What you have here is an entire Corporate GIS project and you should go through the Project Management process for it.

What are your requirements? What do you need to connect to what? Who will need access to the information? What will be readable? Can anyone write to it or only specific users? How often will data be updated? Do you need certain tools or functions? And on and on.

Because much of this is specific to the GIS domain, you're likely going to need to ask someone with GIS knowledge; if you don't have anyone on staff then get a consultant. They'll tell you what to ask and help you find out the answers.

Once you have all of those and have your detailed list of requirements, then you can start asking specific questions about which GIS system will meet your clear needs. Its then a procurement exercise to buy it externally or you could build it internally if you have the capacity (maybe built up over the "what are the requirements" stage).

Edit: You may also find these questions helpful, both to specifically deal with issues raised in your question, and also demonstrate the related questions that elicited good answers.

Best practices for managing geospatial data

How do you manage existing GIS data and allow for integration with an Asset management system?

GIS Project Workflow?

Best example of a GIS project gone wrong

Recommendations for road maintenance management (on a small scale)

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