Wikipedia:Graphics Lab/Resources/QGIS/Get ready: Difference between revisions

Revision as of 17:08, 23 September 2011

Revision as of 17:09, 23 September 2011

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;For more precise works

Formerly, the topographic GIS files being too big —about 60GB for the whole Earth—, this data was split into dozens, hundreds, or thousands small tiles about some MB each. The mapmaker had to download the several needed tiles (say 10 tiles for Danemark), and manage these 10 tiles in parallel for color styles, effects, etc.

{{summarization|title=: Depreciated 'tiles download' approach|1=

Formerly, the topographic GIS files being too big —about 60GB for the whole Earth—, this data was split into dozens, hundreds, or thousands small tiles about some MB each. The mapmaker had to download the several needed tiles (say 10 tiles for Danemark), and manage these 10 tiles in parallel for color styles, effects, etc. For maps needing a topographical base, '''confirmed mapmakers''' will prefer to use the SRTM3 for its better quality. However, process is a bit more complex than downloading a single file. You will need to:

# '''Know''' the coordinates of the area you want to map—although you do have the option of visually selecting the area on the download page.

# '''Find''' the associated GIS files (also called '''tiles'''). SRTM files have names such as "N22E112.hgt.zip", standing for 22⁰ North, 112⁰ East.