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MIF/MID Format: What Modern GIS Should Know

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Bill McNeil
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The MIF/MID format once served as a standard vector format for many GIS practitioners using MapInfo. Today, while newer formats dominate, MIF/MID files remain in many legacy archives — and understanding them is still relevant.

Structure and Use Cases of MIF/MID

MIF files store geometry, MID files store attributes. Together they represent spatial vectors and their associated data, allowing flexible mapping and attribute-based queries — albeit with limited projection metadata and no built-in spatial indexing.

Challenges When Migrating to Modern GIS

Common issues include missing projection information, inconsistent encoding, and lack of metadata about data origin or scale. Without careful review, imported MIF/MID data may misalign or misrepresent real-world features.

How to Handle Legacy Data Safely

When importing MIF/MID into modern GIS or spatial databases, always assign or verify correct CRS, review attribute encoding, and, if possible, cross-validate geometry against current data or satellite imagery.

Legacy formats like MIF/MID carry historical value — but only with careful handling do they remain useful in contemporary GIS workflows.

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