Hi,

I want to download all tiles for a subdistrict at level 15. A subdistrict can usually be contained in a 30km x 30km square. I want to download the underlying bing image and osm maps. The age of the satellite image or map does not have to be the most recent or the latest. Can someone recommend me an easy to use existing program or a script to do the same.

The purpose is to process the images off-line, refer to publicly released maps etc and identify objects of interest in the subdistrict. These objects can then be created on osm, online, in a separate process.

At zoom level 15, one meter is represented by 4.773 pixels (see http://wiki.openstreetmap.org/wiki/Zoom_levels see m / pixel column in the table). So, to represent a 30 kilometers square on earth, my image needs 143190 pixels square or about 560 tiles of 256 pixels each.

Is there a program to combine these .png tiles into a single .png file. (I dont want to install mapnik)

Thanks.

Atamp

asked 29 Sep '14, 07:42

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atamp
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Do any of the answers to these previous questions help?

(29 Sep '14, 09:09) SomeoneElse ♦

You read the zoom table wrong: 1 pixel represents 4.773 meters. But comparing with the ruler at the left bottom corner, this does not fit exactly, are the table values outdated/wrong?

(29 Sep '14, 10:17) MarkusHD

I think the meters per pixel values are only valid at the equator (similar to the scale column) due to the nature of the projection. See the meters per pixel formular for calculating the correct value at a given latitude.

(29 Sep '14, 14:07) scai ♦
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question asked: 29 Sep '14, 07:42

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last updated: 29 Sep '14, 14:10

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