Product: MapInfo Professional
Version: 8.0
Platform: Citrix; Windows 2003 Server Enterprise; Windows 98 SE; Windows NT 4.0 SP6A; Windows XP Home; Windows XP Home SP1A; Windows XP Home SP2; Windows XP Professional; Windows XP Professional SP 1A; Windows XP Professional SP 2; Windows 2000 Professional SP4
Category: Object Editing
Summary:
Object size enhancements (MapInfo Professional v8.0).
Question:
Object size enhancements (MapInfo Professional v8.0).
Answer:
• Increased the number of nodes permitted per object for regions, polylines, and multipoints.
• Increased the number of polygons allowed in a multipolygon region and increase the number of polylines in a multiple segment polyline.
Many use the contouring process to create signal coverage maps, which requires these object size changes to create highly detailed coverage areas. To accommodate this need, MapInfo has increased the limit on number of nodes and the number of polygons or polylines that can be stored in objects.
Theoretically, the size of an object is only limited by the amount of memory in the system, but for practical reasons, a limit is imposed to work within limits of a 2GB maximum file size and most system memory limits. For version 8.0, this size limit for objects is 1,073,741,823 bytes in memory. MapInfo selected this limit so that an object of this size can be saved into a .map file. All MapInfo Professional files have a theoretical limit of 2GB, but due to header size and other required .map file contents, the actual size limit has to be a bit less.
MapInfo has increased the node limit to 134,217,724 nodes in any object. This is the actual number of nodes that can fit into this 2GB memory size limit. It will be difficult to reach this new node limit because memory allocation may prohibit it. It may not be possible to create a .map file this size on a computer being used to accommodate an object this size; the program may throw an error when trying it.
• For regions, the theoretical maximum number of polygons in a multi-polygon region or collection is 20,648,881 polygons that can fit into the size limit for all objects given above.
• For polyline objects, the theoretical maximum number of segments in a multi-segment polyline is 24,403,223 that can fit into the size limit for all objects given above.
• For multipoint objects, the theoretical maximum number of nodes is 134,217,724 that can fit into the size limit for all objects given above.
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