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