kucjac / flyover-reverse-engineering Goto Github PK

This is an attempt to reverse-engineer Flyover (= 3D satellite mode) from Apple Maps. Main goal is to document the results and to provide code that emerges.

Noticed differences between Google Earth and Apple Flyover during previous project. Extreme example:

Google Earth	Apple Flyover

Data is stored in map tiles. These five tile styles are used for Flyover:

• 🅐: URL prefix from resource manifest
• ⓿: Version from resource manifest or altitude manifest using region
• ❶: Region ID from altitude manifest
• ❷❸❹: Map tile numbers (tiled web map scheme)
• ❺: Height/altitude index. Probably from C3MM
• ❻: Incremental part number
• ❼❽: Size/scale. Not sure where its values come from

ResourceManifest
└─ AltitudeManifest
   ├─ C3MM
   │  └─ C3M
   └─ DTM?

Focusing on C3M(M) for now. DTMs are just images with a footer; they're probably used for the grid that is displayed when Maps is loading.

Here

This repository is structured as follows:

Install Go and run go get github.com/retroplasma/flyover-reverse-engineering. Then edit config.json in $GOPATH/src/github.com/retroplasma/flyover-reverse-engineering:

• automatically on macOS:
  • ./scripts/get_config_macos.sh > config.json
• or manually:
  • resourceManifestURL: from com.apple.GEO.plist or GeoServices binary
  • tokenP1: from GeoServices binary (function: GEOURLAuthenticationGenerateURL)

Here are some independent command line programs that use code from pkg:

This exports Santa Monica Pier to ./export:

go run cmd/poc-export-obj/main.go

This authenticates a URL using parameters from config.json:

go run cmd/auth/main.go [url]

This parses a C3M v3 file, decompresses meshes, reads JPEG textures and produces a struct that contains a textured 3d model:

go run cmd/parse-c3m/main.go [file]

go run cmd/parse-c3mm/main.go [file]

• ~/Library/Preferences/com.apple.GEO.plist
  • last resource manifest url
• ~/Library/Caches/GeoServices/Resources/altitude-*.xml
  • defines regions for c3m urls
  • altitude-*.xml url in resource manifest
• ~/Library/Containers/com.apple.geod/Data/Library/Caches/com.apple.geod/MapTiles/MapTiles.sqlitedb
  • local map tile cache
• /System/Library/PrivateFrameworks/GeoServices.framework/GeoServices
  • resource manifest base url, networking, caching, authentication
• /System/Library/PrivateFrameworks/VectorKit.framework/VectorKit
  • parsers, decoders
• /System/Library/PrivateFrameworks/GeoServices.framework/XPCServices/com.apple.geod.xpc
  • loads GeoServices
• /Applications/Maps.app/Contents/MacOS/Maps
  • loads VectorKit

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