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Intro.wmv
CaveMaps.org
• 300+ Entrances on Google Maps• 70+ Cave Outlines on Google Maps• 500+ Full resolution surveys• 1200+ Surveys catalogued & thumb-nailed • 120 Visits per week• No. 1 Google Hit for ‘Cave Maps’
Work in progress ...
Contributing Clubs• CPC• RRCPC• BPC• NCC• LUSS• YSS• ULSA• Black Sheep Diggers• KCC• NPC
Google Earth Overlay
Scanning Old Cave Surveys
• E.g. 300 DPI Greyscale
Scan at the highest resolution
Don’t Save as JPEG
Preserve Anti-aliasing
How to restore Anti-aliasing
• Scan at high DPI• Clean up the image• Resample to reduce image size
Transparent Backgrounds
1st Attempt: Magic Wand
2nd Attempt: Colour Replacement
3rd Attempt: Colour to Alpha
Google Earth Overlays
Double Entrance.avi
Double Entrance (part 2).avi
Videos\Single Entrance.wmv
Google Map Tiles
Zoom 0 Zoom 1
256 pixels
Zoom 1 (4 tiles) Zoom 2 (16 tiles)
Zoom Tiles0 11 42 163 644 2565 1,0246 4,0967 16,3848 65,5369 262,144
10 1,048,57611 4,194,30412 16,777,21613 67,108,86414 268,435,45615 1,073,741,82416 4,294,967,29617 17,179,869,18418 68,719,476,73619 274,877,906,944 2621 Terabytes
Zoom 19 Zoom 21 Street View
Photoshop
Kml2Tiles.exe
Input: KML
Output: Map Tiles
DeepZoom
Ease Gill
Galegarth
The West Kingsdale System
DeepZoom Examples
Microsoft ICE
iPhone DeepZoom Viewer
CaveMaps.org/bing
Offline Mobile Cave Overlays
Video
Is Google Maps more accurate than GPS?
Google Maps – Errors due to Elevation
• Blackpool Tower 150m:
Error 26m
• Ingleborough 723m:
Error 125m?
Google Maps – Changes over Time
2000 - 2010
Google v Microsoft
Google Microsoft
4m Difference
GPS Accuracy:
+/- 10m
Google Maps Accuracy:
+/- 10m ?
Conclusion