<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Hi,</div><div>I have two different geotiff-charts which have the same number of pixels, and similar information when viewing in gdalinfo,</div><div>but one misbehaves while tiling. </div><div>For the problem chart, only the zoom levels 0-6 are tiled, but for the correctly handled chart, zoom levels 4-11 are tiled.</div><div>Both are around 23000x15000 pixels and 72 dpi.</div><div>So, what decides the zoom levels? I thought it was pixels and dpi..</div><div><br></div><div>gdalinfo on the working chart gives:</div><div><br></div><div><div>Coordinate System is:</div><div>Size is 15108, 23181</div><div>GEOGCS["WGS 84",</div><div> DATUM["WGS_1984",</div><div> SPHEROID["WGS 84",6378137,298.257223563,</div><div> AUTHORITY["EPSG","7030"]],</div><div> AUTHORITY["EPSG","6326"]],</div><div> PRIMEM["Greenwich",0],</div><div> UNIT["degree",0.0174532925199433],</div><div> AUTHORITY["EPSG","4326"]]</div><div>Origin = (167.635052101782918,-27.435225354710909)</div><div>Pixel Size = (0.000619744987014,-0.000517525434692)</div><div>Metadata:</div><div> AREA_OR_POINT=Area</div><div>Image Structure Metadata:</div><div> COMPRESSION=LZW</div><div> INTERLEAVE=PIXEL</div><div>Corner Coordinates:</div><div>Upper Left ( 167.6350521, -27.4352254) (167d38' 6.19"E, 27d26' 6.81"S)</div><div>Lower Left ( 167.6350521, -39.4319825) (167d38' 6.19"E, 39d25'55.14"S)</div><div>Upper Right ( 176.9981594, -27.4352254) (176d59'53.37"E, 27d26' 6.81"S)</div><div>Lower Right ( 176.9981594, -39.4319825) (176d59'53.37"E, 39d25'55.14"S)</div><div>Center ( 172.3166057, -33.4336039) (172d18'59.78"E, 33d26' 0.97"S)</div><div>Band 1 Block=15108x1 Type=Byte, ColorInterp=Red</div><div> Mask Flags: PER_DATASET ALPHA </div><div>Band 2 Block=15108x1 Type=Byte, ColorInterp=Green</div><div> Mask Flags: PER_DATASET ALPHA </div><div>Band 3 Block=15108x1 Type=Byte, ColorInterp=Blue</div><div> Mask Flags: PER_DATASET ALPHA </div><div>Band 4 Block=15108x1 Type=Byte, ColorInterp=Alpha</div></div><div><br></div><div><div>gdalinfo on the problem chart gives:</div></div><div><div>Size is 15319, 23593</div><div>Coordinate System is:</div><div>GEOGCS["WGS 84",</div><div> DATUM["WGS_1984",</div><div> SPHEROID["WGS 84",6378137,298.257223563,</div><div> AUTHORITY["EPSG","7030"]],</div><div> AUTHORITY["EPSG","6326"]],</div><div> PRIMEM["Greenwich",0],</div><div> UNIT["degree",0.0174532925199433],</div><div> AUTHORITY["EPSG","4326"]]</div><div>Origin = (176.502369113268770,-25.635284667174400)</div><div>Pixel Size = (0.000619910224237,-0.000526829594898)</div><div>Metadata:</div><div> AREA_OR_POINT=Area</div><div>Image Structure Metadata:</div><div> COMPRESSION=LZW</div><div> INTERLEAVE=PIXEL</div><div>Corner Coordinates:</div><div>Upper Left ( 176.5023691, -25.6352847) (176d30' 8.53"E, 25d38' 7.02"S)</div><div>Lower Left ( 176.5023691, -38.0647753) (176d30' 8.53"E, 38d 3'53.19"S)</div><div>Upper Right ( 185.999, -25.635) (185d59'55.59"E, 25d38' 7.02"S)</div><div>Lower Right ( 185.999, -38.065) (185d59'55.59"E, 38d 3'53.19"S)</div><div>Center ( 181.251, -31.850) (181d15' 2.06"E, 31d51' 0.11"S)</div><div>Band 1 Block=15319x1 Type=Byte, ColorInterp=Red</div><div> Mask Flags: PER_DATASET ALPHA </div><div>Band 2 Block=15319x1 Type=Byte, ColorInterp=Green</div><div> Mask Flags: PER_DATASET ALPHA </div><div>Band 3 Block=15319x1 Type=Byte, ColorInterp=Blue</div><div> Mask Flags: PER_DATASET ALPHA </div><div>Band 4 Block=15319x1 Type=Byte, ColorInterp=Alpha</div></div><div><br></div><div>Regards</div><div>/Per</div><br><div apple-content-edited="true">
<span><img height="35" width="160" id="48866b4a-d17d-4291-bcc5-2e6f8bc10cb3" apple-width="yes" apple-height="yes" src="cid:50A4BFE2-73C1-4CA9-92C1-20802C529E2B"></span><br class="Apple-interchange-newline"><br style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 11px; ">Per Ohlson, M.Sc. E.E.</span></font></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 11px; ">Nanight AB - <a href="http://www.nanight.se">http://www.nanight.se</a></span></font></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "></div></div></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 11px; ">Stockholm/Gothenburg, Sweden</span></font></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 11px; "><a href="mailto:per.ohlson@nanight-tech.com">per.ohlson@nanight-tech.com</a></span></font></div>
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