Comments on: Unix command-line tile cutter for Google Maps

By: Ian Stevens

Ian Stevens — Sun, 02 Jan 2011 23:59:02 +0000

Pete, you most certainly will have to transform the map so that it fits to Google’s map projection. Sorry, my tile cutter doesn’t perform such a transformation.

By: Pete

Pete — Tue, 21 Dec 2010 22:33:31 +0000

When trying to do this on a US scale map, i’m getting tiles which are not transformed correctly, it appears that it might need ‘a quadratic transform?’ or so i’ve been told..

Trying to do it with a NOAA radar map:
http://radar.weather.gov/ridge/Conus/RadarImg/latest_radaronly.gif

lat lng’s are in the KML for it..

Any suggestions?

Thanks!

By: Ian Stevens

Ian Stevens — Wed, 08 Dec 2010 15:59:54 +0000

Hi Justin. Unfortunately, the tiles generated from your image outnumber the maximum number of arguments one is able to specify in the command-line. The script is in BASH, and I leverage command-line utils to find and number tiles. I will have to modify the script to support an arbitrary number of tiles. Frankly, I’m surprised that your machine didn’t keel over when tiling that file. How long did it take before it crashed?

By: Justin

Justin — Mon, 29 Nov 2010 03:42:02 +0000

Hi, i’m using the .11 version of the script on a large file (almost 2gig) The file cuts the image just fine but when it tried to do the rename it errors with

googletilecutter-0.11.sh: line 180: /bin/ls: Argument list too long

There are 5192 temporary files created, I’m assuming those are the images, but without the rename they are a tad usles. Any ideas?

By: Ian Stevens

Ian Stevens — Wed, 08 Sep 2010 00:06:55 +0000

Sorry, Mo, it will not automatically scale your tiles for different zoom levels. You will have to generate large images, one per zoom level, and execute the script as shown for each level.

By: Mo

Mo — Tue, 07 Sep 2010 08:40:09 +0000

Hello Ian,

Great tool! I was wondering if this can cut tiles given Max and Min Zoom level. Like the script you mentioned at (http://mapki.com/wiki/Automatic_Tile_Cutter).
I would like to do something exactly like that but through bash script.

Cheers

By: Ian Stevens

Ian Stevens — Wed, 25 Aug 2010 15:47:53 +0000

Hi Alex. There is no way to currently specify the background colour. I assume that all maps will be overlays and would require some level of transparency. What you could do is add a layer underneath the map tile layer, which makes use of a single tile image of solid colour.

By: Alex

Alex — Mon, 23 Aug 2010 21:59:22 +0000

hello,
i’ve used your tool to build a middle-earth map, extremely useful! thanks!

is there any way to specify a background color if the tile is not a multiple of 256?

By: allankliu

allankliu — Tue, 22 Jun 2010 23:54:43 +0000

Good script, I am going to build my own image distribution system based upon GIS map framework. I am also trying to implement it in Bash shell, rather than Python. You script gives much information. There are some differences between your implementation and my daily work.

1) I use Lat/Lng/Zoom rather than x/y/z, which is calculated by Python or bc.
2) I would rather to crop off picture if it just a little bigger than 256 pix.

Thanks for your code.

By: Ian Stevens

Ian Stevens — Mon, 21 Jun 2010 20:51:33 +0000

Kevin, if my explanation above is insufficient, this may help explain it better: http://mapki.com/wiki/Automatic_Tile_Cutter#How_to_Figure_Out_the_Values_for_Your_Tiles