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Exploring IMG Format
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What is NT IMG format?
Many of the new features are a result of car sat nav development. 1) Routing is more compacted 2) Includes multiple lane routing/switching on a motorway 3) Handles Junction View (JCV), pictures that popup at junctions, stored as a SVG (text) file 3) polygons can have height to enable 3d structures 4) Searches include Post Codes 5) Can contain raster images(jpgs) 6) Extra POIs and Active Routing 7) Better support for non english/american labelling Some details regarding NT POIs have been reversed engineered here |
RGN Header
| RGN Offset | RGN Header |
| 00 | Header Length |
| 02 | GARMIN RGN |
| 15 | Pointer to beginning of RGN1 data, ie first subdivision to include possible POIs,Indexed POIs,Polylines or Polygons or first map level |
| 19 | Length of this block |
| 1D | Pointer to RGN2 data block,contains polygons with extended types 0 x 100+ ; for undocumented details about its structure see Exploring IMG Format |
| 21 | Length of this block |
| 39 | Pointer to RGN3 data block ; this block contains polylines with extended types 0 x 100+ ; for undocumented details about its structure see Exploring IMG Format |
| 3d | Length of this block |
| 55 | Pointer to RGN4 block containing extended POIs ; for undocumented details about its structure see Exploring IMG Format |
| 59 | Length of RGN4 block |
NT POIs The NT poi file structure is slowly revealing itself - more here |
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Exploring IMG Format How to plot highways etc Find out ,step by step, how highways,polygons and pois are plotted in a Garmin IMG file and how names/labels are stored/unzipped. Exploring IMG Format focuses on the RGN ,TRE LBL NET & NOD subfiles and includes various undocumented blocks in the RGN & TRE subfile using numerous examples to make its complicated structure more accessible. It also explains how TOPO files are locked and what can still be retrieved. Maplevels & Subdivisions Maplevels are like zoom levels. Each map level contains a group of subdivisions. The last map level in an IMG file holds the most detailed subdivision(s) which unlike the earlier ones generally do not need to be left_shifted. |
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Offset 0 x 15 points to the first maplevel / subdivision as defined in TRE. with additional information in Exploring IMG Format It generally starts with 2 byte offsets to a different element type , ie polylines or polygons,within a given map level block. If just one element, ie polylines, is found ,then the subdivision contains no offsets. Example: 28 00 35 01 64 12 00 00 5e FF BD FF 17 64 CF 00 80 7A 00 94 FF 0F Pointers are highlighted in bold:
Checkout Latest NT findings
More information in the following document:
Download Exploring IMG Format (pdf)
(latest with info on FID and PID & TRE SEP 3 2012)
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Garmin GPI Files (POIs for Car/Bike Satnavs)
More information about its file structure
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JUNCTION VIEW
Click here to check out JCV file structure
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