.img to .shp?

therock003
therock003 Global Mapper User
edited May 2009 in Vector Data
I have got some custom non-Garmin Maps in .img format prepped for Garmin Units.

My question is how can i turn them via globbalmapper to shapefiles (.shp)?

When i open the .img file a list with hunderdeds of entries pops asks me of the format.

How can it be recognized as the file that it is, and turned to a reliable shapefile for use with GIS applications?

Comments

  • global_mapper
    global_mapper Administrator
    edited May 2009
    While you can use Global Mapper to generate new Garmin .img format files from other data, Global Mapper does not support loading Garmin .img format files.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • therock003
    therock003 Global Mapper User
    edited May 2009
    thanx for the answer. So what would be the best choice to convert it in order for globbalmapper to handle it? Can i convert it to another format without losing any information so that it can be used with globbalmapper?
  • global_mapper
    global_mapper Administrator
    edited May 2009
    I don't know that there are any applications out there that can bring in Garmin .img format files. If you could get them in, then Shapefiles, Polish MP files, or MapInfo MIF/MID files might be good formats to store the data in to bring it into Global Mapper.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • therock003
    therock003 Global Mapper User
    edited May 2009
    I found an application that can get garmin .img and turn them to polish mp files.

    I was able to open it in globbalmapper and export it, but resulted in my system running out of resources.

    So now i need to find a way to extract a specific mapset from inside an .img file.

    BTW will the .mp be converted to a dxf or shapefile with no loss of information? Will the output be exactly as the input? I mean will the information be accurate with this kind of conversion?
  • global_mapper
    global_mapper Administrator
    edited May 2009
    What resulting in your system running out of resources? The export from Global Mapper or something else? You can break your export up into smaller pieces using the Gridding tab when exporting from Global Mapper.

    When exporting to a DXF or Shapefile the spatial information should be perfectly preserved, as well as type information. The Shapefile export will also preserve any other attributes associated with the features.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • therock003
    therock003 Global Mapper User
    edited May 2009
    Well i dont like the result, cause thing is, it looks different from the get go. I have only found that gpsmapedit can directly open garmin .img and save them as polish .mp, but hey look a lot different. Dont know if other software could do it though.

    First is mapsource then gpsmapedit translating the file. Problem is, i want to retain the roads thickness and colours, but it seems i cant.
  • global_mapper
    global_mapper Administrator
    edited May 2009
    The Garmin .img format doesn't contain styling information for the roads, it just contains the types of the roads. It is up to the application (like MapSource) to display the roads with a particular style. I think you'll get an appearance more like MapSource if your view the MP file in Global Mapper than in gpsMapedit. Plus in Global Mapper you can customize the road display to get what you want.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • therock003
    therock003 Global Mapper User
    edited May 2009
    Ok thanx for explaining this, i will have to look the styling aspect more thoroughly.

    For the moment i would also like to ask a couple of quick questions concerning the projection system.

    -I exported to both dxf and .shp and i opened them in AutoCAD Map. The DXF seemd distorted. Did it use a diferent projection system for output?

    -The .SHP on the other hand, although it looked more normal, it was recognized as Antartic98! Isnt it supposed to be WGS84, since all GPS maps use this projection?
  • global_mapper
    global_mapper Administrator
    edited May 2009
    The DXF and Shapefile exports should use whatever projection is defined on the Projection tab of the Configuration dialog prior to export. By default this will be Geographic/WGS84 for MP files. For a less distorted display I would suggest using UTM or something like that.

    I don't know why the .SHP file would be recognized as Antarctic98, that is not what the exported PRJ file should say.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com

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