EVOLUTION-MANAGER

Edit File: frmt_mbtiles.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>MBTiles</title>
</head>

<body>

<h1>MBTiles</h1>

<p>Starting with GDAL 1.10, the MBTiles driver allows to read rasters in the MBTiles format,
which is a specification for storing tiled map data in SQLite databases.</p>

<p>GDAL/OGR must be compiled with OGR SQLite driver support, and JPEG and PNG drivers.</p>

<p>The SRS is always the Pseudo-Mercator (a.k.a Google Mercator) projection.</p>

<p>The driver can retrieve pixel attributes encoded according to the UTFGrid specification
available in some MBTiles files. They can be obtained with the gdallocationinfo utility, or
with a GetMetadataItem("Pixel_iCol_iLine", "LocationInfo") call on a band object.<p>

<h2>Examples:</h2>

<ul>

<li>Accessing a remote MBTiles raster :
<pre>
$ gdalinfo /vsicurl/http://a.tiles.mapbox.com/v3/kkaefer.iceland.mbtiles
</pre>
Output:
<pre>
Driver: MBTiles/MBTiles
Files: /vsicurl/http://a.tiles.mapbox.com/v3/kkaefer.iceland.mbtiles
Size is 16384, 16384
Coordinate System is:
PROJCS["WGS 84 / Pseudo-Mercator",
    GEOGCS["WGS 84",
        DATUM["WGS_1984",
            SPHEROID["WGS 84",6378137,298.257223563,
                AUTHORITY["EPSG","7030"]],
            AUTHORITY["EPSG","6326"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4326"]],
    PROJECTION["Mercator_1SP"],
    PARAMETER["central_meridian",0],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",0],
    PARAMETER["false_northing",0],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["X",EAST],
    AXIS["Y",NORTH],
    EXTENSION["PROJ4","+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext  +no_defs"],
    AUTHORITY["EPSG","3857"]]
Origin = (-3757031.250000000000000,11271093.750000000000000)
Pixel Size = (152.873992919921875,-152.873992919921875)
Image Structure Metadata:
  INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left  (-3757031.250,11271093.750) ( 33d44'59.95"W, 70d36'45.36"N)
Lower Left  (-3757031.250, 8766406.250) ( 33d44'59.95"W, 61d36'22.97"N)
Upper Right (-1252343.750,11271093.750) ( 11d14'59.98"W, 70d36'45.36"N)
Lower Right (-1252343.750, 8766406.250) ( 11d14'59.98"W, 61d36'22.97"N)
Center      (-2504687.500,10018750.000) ( 22d29'59.97"W, 66d30'47.68"N)
Band 1 Block=256x256 Type=Byte, ColorInterp=Red
  Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512
  Mask Flags: PER_DATASET ALPHA
  Overviews of mask band: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512
Band 2 Block=256x256 Type=Byte, ColorInterp=Green
  Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512
  Mask Flags: PER_DATASET ALPHA
  Overviews of mask band: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512
Band 3 Block=256x256 Type=Byte, ColorInterp=Blue
  Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512
  Mask Flags: PER_DATASET ALPHA
  Overviews of mask band: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512
Band 4 Block=256x256 Type=Byte, ColorInterp=Alpha
  Overviews: 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512
</pre>
</li>

<li>Reading pixel attributes encoded according to the UTFGrid specification :
<pre>
$ gdallocationinfo /vsicurl/http://a.tiles.mapbox.com/v3/mapbox.geography-class.mbtiles -wgs84 2 49 -b 1 -xml
</pre>
Output:
<pre>
&lt;Report pixel="33132" line="22506"&gt;
  &lt;BandReport band="1"&gt;
    &lt;LocationInfo&gt;
      &lt;Key&gt;74&lt;/Key&gt;
      &lt;JSon&gt;{"admin":"France","flag_png":"iVBORw0KGgoAAAANSUhEUgAAAGQAAABDEAIAAAC1uevOAAAACXBIWXMAAABIAAAASABGyWs+AAAABmJLR0T///////8JWPfcAAABPklEQVR42u3cMRLBQBSA4Zc9CgqcALXC4bThBA5gNFyFM+wBVNFqjYTszpfi1Sm++bOv2ETEdNK2pc/T9ny977rCn+fx8rjtc7dMmybnxXy9KncGWGCBBRZYYIEFFlhggQUWWGCBBRZYYIE1/GzSLB0CLLAUCyywwAILLLDAAgsssGyFlcAqnJRiKRZYYIEFFlhggQUWWGDZCsFSLLDAAgsssP4DazQowVIssMACy1ZYG6wP30qxwFIssMACCyywwOr/HAYWWIplKwQLLLDAAgssZyywwAILLLDAqh6We4VgKZatECywFAsssMACCyywwAILLLBshWCBpVhggQUWWGCBBRZYYIFlKwQLLMUCCyywwAILLLBG+T8ZsMBSLFshWIoFFlhg/fp8BhZYigUWWGB9C+t9ggUWWGD5FA44XxBz7mcwZM9VAAAAJXRFWHRkYXRlOmNyZWF0ZQAyMDExLTA5LTAyVDIzOjI5OjIxLTA0OjAwcQbBWgAAACV0RVh0ZGF0ZTptb2RpZnkAMjAxMS0wMi0yOFQyMTo0ODozMS0wNTowMJkeu+wAAABSdEVYdHN2ZzpiYXNlLXVyaQBmaWxlOi8vL2hvbWUvYWovQ29kZS90bS1tYXN0ZXIvZXhhbXBsZXMvZ2VvZ3JhcGh5LWNsYXNzL2ZsYWdzL0ZSQS5zdmen2JoeAAAAAElFTkSuQmCC"}&lt;/JSon&gt;
    &lt;/LocationInfo&gt;
    &lt;Value&gt;238&lt;/Value&gt;
  &lt;/BandReport&gt;
&lt;/Report&gt;
</pre>
</li>

</ul>

<ul>
<li><a href="https://github.com/mapbox/mbtiles-spec">MBTiles specification</a></li>
<li><a href="https://github.com/mapbox/utfgrid-spec/blob/master/1.0/utfgrid.md">UTFGrid specification</a></li>
</ul>

</body>
</html>