The MDR file format is a simple format that consists of a 1024-byte header followed by a raster block of 32-bit floating-point samples. Byte order of all fields and data is Intel order (LSB first). The VC++ structure definition for the file header is shown below:
There is a problem with 32-bit MDR vs. 64-bit MDR files embodied in the pointers in the structure. There will likely be an offset from 32-bit vs 64-bit files.Code:// make sure we're aligned on 2-byte boundaries for this declaration #pragma pack(push) #pragma pack(2) // map structure definitions struct MDRHeader { union { struct { char Chunk[4]; // name of chunk - should be "WLBR" int Next; // offset in file to next data (unused) char Name[256]; // name associated with the data (unused) double Left; // min longitude double Right; // max longitude double Top; // max latitude double Bottom; // min latitude double Min; // lowest point on surface double Max; // highest point on surface double XRes; // distance between X points (right - left) / XSize double YRes; // distance between Y points (top - bottom) / YSize int Version; // version number (unused, should be 0) int TypeInfo; // type information (should always be 0) char SurfName[8]; // name of data block (unused) void** SurfData; // pointer to surface data (unused) char PicName[8]; // name of picture block (unused) void** PicData; // pointer to image data (unused) int XSize; // width of blocks int YSize; // height of blocks }; // struct struct { char Padding[1024]; // make the structure 1024 bytes long }; }; // union }; // MDRHeader #pragma pack(pop)
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